1/* 2 * Copyright (c) 1982, 1986, 1989, 1991, 1993 3 * The Regents of the University of California. All rights reserved. 4 * (c) UNIX System Laboratories, Inc. 5 * All or some portions of this file are derived from material licensed 6 * to the University of California by American Telephone and Telegraph 7 * Co. or Unix System Laboratories, Inc. and are reproduced herein with 8 * the permission of UNIX System Laboratories, Inc. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 4. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 * 34 * @(#)kern_sig.c 8.7 (Berkeley) 4/18/94 35 */ 36 37#include <sys/cdefs.h>
| 1/* 2 * Copyright (c) 1982, 1986, 1989, 1991, 1993 3 * The Regents of the University of California. All rights reserved. 4 * (c) UNIX System Laboratories, Inc. 5 * All or some portions of this file are derived from material licensed 6 * to the University of California by American Telephone and Telegraph 7 * Co. or Unix System Laboratories, Inc. and are reproduced herein with 8 * the permission of UNIX System Laboratories, Inc. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 4. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 * 34 * @(#)kern_sig.c 8.7 (Berkeley) 4/18/94 35 */ 36 37#include <sys/cdefs.h>
|
38__FBSDID("$FreeBSD: head/sys/kern/kern_sig.c 130192 2004-06-07 13:35:02Z davidxu $");
| 38__FBSDID("$FreeBSD: head/sys/kern/kern_sig.c 130344 2004-06-11 11:16:26Z phk $");
|
39 40#include "opt_compat.h" 41#include "opt_ktrace.h" 42 43#include <sys/param.h> 44#include <sys/systm.h> 45#include <sys/signalvar.h> 46#include <sys/vnode.h> 47#include <sys/acct.h> 48#include <sys/condvar.h> 49#include <sys/event.h> 50#include <sys/fcntl.h> 51#include <sys/kernel.h> 52#include <sys/kse.h> 53#include <sys/ktr.h> 54#include <sys/ktrace.h> 55#include <sys/lock.h> 56#include <sys/malloc.h> 57#include <sys/mutex.h> 58#include <sys/namei.h> 59#include <sys/proc.h> 60#include <sys/pioctl.h> 61#include <sys/resourcevar.h> 62#include <sys/sleepqueue.h> 63#include <sys/smp.h> 64#include <sys/stat.h> 65#include <sys/sx.h> 66#include <sys/syscallsubr.h> 67#include <sys/sysctl.h> 68#include <sys/sysent.h> 69#include <sys/syslog.h> 70#include <sys/sysproto.h> 71#include <sys/unistd.h> 72#include <sys/wait.h> 73 74#include <machine/cpu.h> 75 76#if defined (__alpha__) && !defined(COMPAT_43) 77#error "You *really* need COMPAT_43 on the alpha for longjmp(3)" 78#endif 79 80#define ONSIG 32 /* NSIG for osig* syscalls. XXX. */ 81 82static int coredump(struct thread *); 83static char *expand_name(const char *, uid_t, pid_t); 84static int killpg1(struct thread *td, int sig, int pgid, int all); 85static int issignal(struct thread *p); 86static int sigprop(int sig); 87static void stop(struct proc *); 88static void tdsigwakeup(struct thread *td, int sig, sig_t action); 89static int filt_sigattach(struct knote *kn); 90static void filt_sigdetach(struct knote *kn); 91static int filt_signal(struct knote *kn, long hint); 92static struct thread *sigtd(struct proc *p, int sig, int prop); 93static int kern_sigtimedwait(struct thread *td, sigset_t set, 94 siginfo_t *info, struct timespec *timeout); 95static void do_tdsignal(struct thread *td, int sig, sigtarget_t target); 96 97struct filterops sig_filtops = 98 { 0, filt_sigattach, filt_sigdetach, filt_signal }; 99 100static int kern_logsigexit = 1; 101SYSCTL_INT(_kern, KERN_LOGSIGEXIT, logsigexit, CTLFLAG_RW, 102 &kern_logsigexit, 0, 103 "Log processes quitting on abnormal signals to syslog(3)"); 104 105/* 106 * Policy -- Can ucred cr1 send SIGIO to process cr2? 107 * Should use cr_cansignal() once cr_cansignal() allows SIGIO and SIGURG 108 * in the right situations. 109 */ 110#define CANSIGIO(cr1, cr2) \ 111 ((cr1)->cr_uid == 0 || \ 112 (cr1)->cr_ruid == (cr2)->cr_ruid || \ 113 (cr1)->cr_uid == (cr2)->cr_ruid || \ 114 (cr1)->cr_ruid == (cr2)->cr_uid || \ 115 (cr1)->cr_uid == (cr2)->cr_uid) 116 117int sugid_coredump; 118SYSCTL_INT(_kern, OID_AUTO, sugid_coredump, CTLFLAG_RW, 119 &sugid_coredump, 0, "Enable coredumping set user/group ID processes"); 120 121static int do_coredump = 1; 122SYSCTL_INT(_kern, OID_AUTO, coredump, CTLFLAG_RW, 123 &do_coredump, 0, "Enable/Disable coredumps"); 124 125/* 126 * Signal properties and actions. 127 * The array below categorizes the signals and their default actions 128 * according to the following properties: 129 */ 130#define SA_KILL 0x01 /* terminates process by default */ 131#define SA_CORE 0x02 /* ditto and coredumps */ 132#define SA_STOP 0x04 /* suspend process */ 133#define SA_TTYSTOP 0x08 /* ditto, from tty */ 134#define SA_IGNORE 0x10 /* ignore by default */ 135#define SA_CONT 0x20 /* continue if suspended */ 136#define SA_CANTMASK 0x40 /* non-maskable, catchable */ 137#define SA_PROC 0x80 /* deliverable to any thread */ 138 139static int sigproptbl[NSIG] = { 140 SA_KILL|SA_PROC, /* SIGHUP */ 141 SA_KILL|SA_PROC, /* SIGINT */ 142 SA_KILL|SA_CORE|SA_PROC, /* SIGQUIT */ 143 SA_KILL|SA_CORE, /* SIGILL */ 144 SA_KILL|SA_CORE, /* SIGTRAP */ 145 SA_KILL|SA_CORE, /* SIGABRT */ 146 SA_KILL|SA_CORE|SA_PROC, /* SIGEMT */ 147 SA_KILL|SA_CORE, /* SIGFPE */ 148 SA_KILL|SA_PROC, /* SIGKILL */ 149 SA_KILL|SA_CORE, /* SIGBUS */ 150 SA_KILL|SA_CORE, /* SIGSEGV */ 151 SA_KILL|SA_CORE, /* SIGSYS */ 152 SA_KILL|SA_PROC, /* SIGPIPE */ 153 SA_KILL|SA_PROC, /* SIGALRM */ 154 SA_KILL|SA_PROC, /* SIGTERM */ 155 SA_IGNORE|SA_PROC, /* SIGURG */ 156 SA_STOP|SA_PROC, /* SIGSTOP */ 157 SA_STOP|SA_TTYSTOP|SA_PROC, /* SIGTSTP */ 158 SA_IGNORE|SA_CONT|SA_PROC, /* SIGCONT */ 159 SA_IGNORE|SA_PROC, /* SIGCHLD */ 160 SA_STOP|SA_TTYSTOP|SA_PROC, /* SIGTTIN */ 161 SA_STOP|SA_TTYSTOP|SA_PROC, /* SIGTTOU */ 162 SA_IGNORE|SA_PROC, /* SIGIO */ 163 SA_KILL, /* SIGXCPU */ 164 SA_KILL, /* SIGXFSZ */ 165 SA_KILL|SA_PROC, /* SIGVTALRM */ 166 SA_KILL|SA_PROC, /* SIGPROF */ 167 SA_IGNORE|SA_PROC, /* SIGWINCH */ 168 SA_IGNORE|SA_PROC, /* SIGINFO */ 169 SA_KILL|SA_PROC, /* SIGUSR1 */ 170 SA_KILL|SA_PROC, /* SIGUSR2 */ 171}; 172 173/* 174 * Determine signal that should be delivered to process p, the current 175 * process, 0 if none. If there is a pending stop signal with default 176 * action, the process stops in issignal(). 177 * XXXKSE the check for a pending stop is not done under KSE 178 * 179 * MP SAFE. 180 */ 181int 182cursig(struct thread *td) 183{ 184 PROC_LOCK_ASSERT(td->td_proc, MA_OWNED); 185 mtx_assert(&td->td_proc->p_sigacts->ps_mtx, MA_OWNED); 186 mtx_assert(&sched_lock, MA_NOTOWNED); 187 return (SIGPENDING(td) ? issignal(td) : 0); 188} 189 190/* 191 * Arrange for ast() to handle unmasked pending signals on return to user 192 * mode. This must be called whenever a signal is added to td_siglist or 193 * unmasked in td_sigmask. 194 */ 195void 196signotify(struct thread *td) 197{ 198 struct proc *p; 199 sigset_t set, saved; 200 201 p = td->td_proc; 202 203 PROC_LOCK_ASSERT(p, MA_OWNED); 204 205 /* 206 * If our mask changed we may have to move signal that were 207 * previously masked by all threads to our siglist. 208 */ 209 set = p->p_siglist; 210 if (p->p_flag & P_SA) 211 saved = p->p_siglist; 212 SIGSETNAND(set, td->td_sigmask); 213 SIGSETNAND(p->p_siglist, set); 214 SIGSETOR(td->td_siglist, set); 215 216 if (SIGPENDING(td)) { 217 mtx_lock_spin(&sched_lock); 218 td->td_flags |= TDF_NEEDSIGCHK | TDF_ASTPENDING; 219 mtx_unlock_spin(&sched_lock); 220 } 221 if ((p->p_flag & P_SA) && !(p->p_flag & P_SIGEVENT)) { 222 if (SIGSETEQ(saved, p->p_siglist)) 223 return; 224 else { 225 /* pending set changed */ 226 p->p_flag |= P_SIGEVENT; 227 wakeup(&p->p_siglist); 228 } 229 } 230} 231 232int 233sigonstack(size_t sp) 234{ 235 struct thread *td = curthread; 236 237 return ((td->td_pflags & TDP_ALTSTACK) ?
| 39 40#include "opt_compat.h" 41#include "opt_ktrace.h" 42 43#include <sys/param.h> 44#include <sys/systm.h> 45#include <sys/signalvar.h> 46#include <sys/vnode.h> 47#include <sys/acct.h> 48#include <sys/condvar.h> 49#include <sys/event.h> 50#include <sys/fcntl.h> 51#include <sys/kernel.h> 52#include <sys/kse.h> 53#include <sys/ktr.h> 54#include <sys/ktrace.h> 55#include <sys/lock.h> 56#include <sys/malloc.h> 57#include <sys/mutex.h> 58#include <sys/namei.h> 59#include <sys/proc.h> 60#include <sys/pioctl.h> 61#include <sys/resourcevar.h> 62#include <sys/sleepqueue.h> 63#include <sys/smp.h> 64#include <sys/stat.h> 65#include <sys/sx.h> 66#include <sys/syscallsubr.h> 67#include <sys/sysctl.h> 68#include <sys/sysent.h> 69#include <sys/syslog.h> 70#include <sys/sysproto.h> 71#include <sys/unistd.h> 72#include <sys/wait.h> 73 74#include <machine/cpu.h> 75 76#if defined (__alpha__) && !defined(COMPAT_43) 77#error "You *really* need COMPAT_43 on the alpha for longjmp(3)" 78#endif 79 80#define ONSIG 32 /* NSIG for osig* syscalls. XXX. */ 81 82static int coredump(struct thread *); 83static char *expand_name(const char *, uid_t, pid_t); 84static int killpg1(struct thread *td, int sig, int pgid, int all); 85static int issignal(struct thread *p); 86static int sigprop(int sig); 87static void stop(struct proc *); 88static void tdsigwakeup(struct thread *td, int sig, sig_t action); 89static int filt_sigattach(struct knote *kn); 90static void filt_sigdetach(struct knote *kn); 91static int filt_signal(struct knote *kn, long hint); 92static struct thread *sigtd(struct proc *p, int sig, int prop); 93static int kern_sigtimedwait(struct thread *td, sigset_t set, 94 siginfo_t *info, struct timespec *timeout); 95static void do_tdsignal(struct thread *td, int sig, sigtarget_t target); 96 97struct filterops sig_filtops = 98 { 0, filt_sigattach, filt_sigdetach, filt_signal }; 99 100static int kern_logsigexit = 1; 101SYSCTL_INT(_kern, KERN_LOGSIGEXIT, logsigexit, CTLFLAG_RW, 102 &kern_logsigexit, 0, 103 "Log processes quitting on abnormal signals to syslog(3)"); 104 105/* 106 * Policy -- Can ucred cr1 send SIGIO to process cr2? 107 * Should use cr_cansignal() once cr_cansignal() allows SIGIO and SIGURG 108 * in the right situations. 109 */ 110#define CANSIGIO(cr1, cr2) \ 111 ((cr1)->cr_uid == 0 || \ 112 (cr1)->cr_ruid == (cr2)->cr_ruid || \ 113 (cr1)->cr_uid == (cr2)->cr_ruid || \ 114 (cr1)->cr_ruid == (cr2)->cr_uid || \ 115 (cr1)->cr_uid == (cr2)->cr_uid) 116 117int sugid_coredump; 118SYSCTL_INT(_kern, OID_AUTO, sugid_coredump, CTLFLAG_RW, 119 &sugid_coredump, 0, "Enable coredumping set user/group ID processes"); 120 121static int do_coredump = 1; 122SYSCTL_INT(_kern, OID_AUTO, coredump, CTLFLAG_RW, 123 &do_coredump, 0, "Enable/Disable coredumps"); 124 125/* 126 * Signal properties and actions. 127 * The array below categorizes the signals and their default actions 128 * according to the following properties: 129 */ 130#define SA_KILL 0x01 /* terminates process by default */ 131#define SA_CORE 0x02 /* ditto and coredumps */ 132#define SA_STOP 0x04 /* suspend process */ 133#define SA_TTYSTOP 0x08 /* ditto, from tty */ 134#define SA_IGNORE 0x10 /* ignore by default */ 135#define SA_CONT 0x20 /* continue if suspended */ 136#define SA_CANTMASK 0x40 /* non-maskable, catchable */ 137#define SA_PROC 0x80 /* deliverable to any thread */ 138 139static int sigproptbl[NSIG] = { 140 SA_KILL|SA_PROC, /* SIGHUP */ 141 SA_KILL|SA_PROC, /* SIGINT */ 142 SA_KILL|SA_CORE|SA_PROC, /* SIGQUIT */ 143 SA_KILL|SA_CORE, /* SIGILL */ 144 SA_KILL|SA_CORE, /* SIGTRAP */ 145 SA_KILL|SA_CORE, /* SIGABRT */ 146 SA_KILL|SA_CORE|SA_PROC, /* SIGEMT */ 147 SA_KILL|SA_CORE, /* SIGFPE */ 148 SA_KILL|SA_PROC, /* SIGKILL */ 149 SA_KILL|SA_CORE, /* SIGBUS */ 150 SA_KILL|SA_CORE, /* SIGSEGV */ 151 SA_KILL|SA_CORE, /* SIGSYS */ 152 SA_KILL|SA_PROC, /* SIGPIPE */ 153 SA_KILL|SA_PROC, /* SIGALRM */ 154 SA_KILL|SA_PROC, /* SIGTERM */ 155 SA_IGNORE|SA_PROC, /* SIGURG */ 156 SA_STOP|SA_PROC, /* SIGSTOP */ 157 SA_STOP|SA_TTYSTOP|SA_PROC, /* SIGTSTP */ 158 SA_IGNORE|SA_CONT|SA_PROC, /* SIGCONT */ 159 SA_IGNORE|SA_PROC, /* SIGCHLD */ 160 SA_STOP|SA_TTYSTOP|SA_PROC, /* SIGTTIN */ 161 SA_STOP|SA_TTYSTOP|SA_PROC, /* SIGTTOU */ 162 SA_IGNORE|SA_PROC, /* SIGIO */ 163 SA_KILL, /* SIGXCPU */ 164 SA_KILL, /* SIGXFSZ */ 165 SA_KILL|SA_PROC, /* SIGVTALRM */ 166 SA_KILL|SA_PROC, /* SIGPROF */ 167 SA_IGNORE|SA_PROC, /* SIGWINCH */ 168 SA_IGNORE|SA_PROC, /* SIGINFO */ 169 SA_KILL|SA_PROC, /* SIGUSR1 */ 170 SA_KILL|SA_PROC, /* SIGUSR2 */ 171}; 172 173/* 174 * Determine signal that should be delivered to process p, the current 175 * process, 0 if none. If there is a pending stop signal with default 176 * action, the process stops in issignal(). 177 * XXXKSE the check for a pending stop is not done under KSE 178 * 179 * MP SAFE. 180 */ 181int 182cursig(struct thread *td) 183{ 184 PROC_LOCK_ASSERT(td->td_proc, MA_OWNED); 185 mtx_assert(&td->td_proc->p_sigacts->ps_mtx, MA_OWNED); 186 mtx_assert(&sched_lock, MA_NOTOWNED); 187 return (SIGPENDING(td) ? issignal(td) : 0); 188} 189 190/* 191 * Arrange for ast() to handle unmasked pending signals on return to user 192 * mode. This must be called whenever a signal is added to td_siglist or 193 * unmasked in td_sigmask. 194 */ 195void 196signotify(struct thread *td) 197{ 198 struct proc *p; 199 sigset_t set, saved; 200 201 p = td->td_proc; 202 203 PROC_LOCK_ASSERT(p, MA_OWNED); 204 205 /* 206 * If our mask changed we may have to move signal that were 207 * previously masked by all threads to our siglist. 208 */ 209 set = p->p_siglist; 210 if (p->p_flag & P_SA) 211 saved = p->p_siglist; 212 SIGSETNAND(set, td->td_sigmask); 213 SIGSETNAND(p->p_siglist, set); 214 SIGSETOR(td->td_siglist, set); 215 216 if (SIGPENDING(td)) { 217 mtx_lock_spin(&sched_lock); 218 td->td_flags |= TDF_NEEDSIGCHK | TDF_ASTPENDING; 219 mtx_unlock_spin(&sched_lock); 220 } 221 if ((p->p_flag & P_SA) && !(p->p_flag & P_SIGEVENT)) { 222 if (SIGSETEQ(saved, p->p_siglist)) 223 return; 224 else { 225 /* pending set changed */ 226 p->p_flag |= P_SIGEVENT; 227 wakeup(&p->p_siglist); 228 } 229 } 230} 231 232int 233sigonstack(size_t sp) 234{ 235 struct thread *td = curthread; 236 237 return ((td->td_pflags & TDP_ALTSTACK) ?
|
238#if defined(COMPAT_43) || defined(COMPAT_SUNOS)
| 238#if defined(COMPAT_43)
|
239 ((td->td_sigstk.ss_size == 0) ? 240 (td->td_sigstk.ss_flags & SS_ONSTACK) : 241 ((sp - (size_t)td->td_sigstk.ss_sp) < td->td_sigstk.ss_size)) 242#else 243 ((sp - (size_t)td->td_sigstk.ss_sp) < td->td_sigstk.ss_size) 244#endif 245 : 0); 246} 247 248static __inline int 249sigprop(int sig) 250{ 251 252 if (sig > 0 && sig < NSIG) 253 return (sigproptbl[_SIG_IDX(sig)]); 254 return (0); 255} 256 257int 258sig_ffs(sigset_t *set) 259{ 260 int i; 261 262 for (i = 0; i < _SIG_WORDS; i++) 263 if (set->__bits[i]) 264 return (ffs(set->__bits[i]) + (i * 32)); 265 return (0); 266} 267 268/* 269 * kern_sigaction 270 * sigaction 271 * freebsd4_sigaction 272 * osigaction 273 * 274 * MPSAFE 275 */ 276int 277kern_sigaction(td, sig, act, oact, flags) 278 struct thread *td; 279 register int sig; 280 struct sigaction *act, *oact; 281 int flags; 282{ 283 struct sigacts *ps; 284 struct thread *td0; 285 struct proc *p = td->td_proc; 286 287 if (!_SIG_VALID(sig)) 288 return (EINVAL); 289 290 PROC_LOCK(p); 291 ps = p->p_sigacts; 292 mtx_lock(&ps->ps_mtx); 293 if (oact) { 294 oact->sa_handler = ps->ps_sigact[_SIG_IDX(sig)]; 295 oact->sa_mask = ps->ps_catchmask[_SIG_IDX(sig)]; 296 oact->sa_flags = 0; 297 if (SIGISMEMBER(ps->ps_sigonstack, sig)) 298 oact->sa_flags |= SA_ONSTACK; 299 if (!SIGISMEMBER(ps->ps_sigintr, sig)) 300 oact->sa_flags |= SA_RESTART; 301 if (SIGISMEMBER(ps->ps_sigreset, sig)) 302 oact->sa_flags |= SA_RESETHAND; 303 if (SIGISMEMBER(ps->ps_signodefer, sig)) 304 oact->sa_flags |= SA_NODEFER; 305 if (SIGISMEMBER(ps->ps_siginfo, sig)) 306 oact->sa_flags |= SA_SIGINFO; 307 if (sig == SIGCHLD && ps->ps_flag & PS_NOCLDSTOP) 308 oact->sa_flags |= SA_NOCLDSTOP; 309 if (sig == SIGCHLD && ps->ps_flag & PS_NOCLDWAIT) 310 oact->sa_flags |= SA_NOCLDWAIT; 311 } 312 if (act) { 313 if ((sig == SIGKILL || sig == SIGSTOP) && 314 act->sa_handler != SIG_DFL) { 315 mtx_unlock(&ps->ps_mtx); 316 PROC_UNLOCK(p); 317 return (EINVAL); 318 } 319 320 /* 321 * Change setting atomically. 322 */ 323 324 ps->ps_catchmask[_SIG_IDX(sig)] = act->sa_mask; 325 SIG_CANTMASK(ps->ps_catchmask[_SIG_IDX(sig)]); 326 if (act->sa_flags & SA_SIGINFO) { 327 ps->ps_sigact[_SIG_IDX(sig)] = 328 (__sighandler_t *)act->sa_sigaction; 329 SIGADDSET(ps->ps_siginfo, sig); 330 } else { 331 ps->ps_sigact[_SIG_IDX(sig)] = act->sa_handler; 332 SIGDELSET(ps->ps_siginfo, sig); 333 } 334 if (!(act->sa_flags & SA_RESTART)) 335 SIGADDSET(ps->ps_sigintr, sig); 336 else 337 SIGDELSET(ps->ps_sigintr, sig); 338 if (act->sa_flags & SA_ONSTACK) 339 SIGADDSET(ps->ps_sigonstack, sig); 340 else 341 SIGDELSET(ps->ps_sigonstack, sig); 342 if (act->sa_flags & SA_RESETHAND) 343 SIGADDSET(ps->ps_sigreset, sig); 344 else 345 SIGDELSET(ps->ps_sigreset, sig); 346 if (act->sa_flags & SA_NODEFER) 347 SIGADDSET(ps->ps_signodefer, sig); 348 else 349 SIGDELSET(ps->ps_signodefer, sig);
| 239 ((td->td_sigstk.ss_size == 0) ? 240 (td->td_sigstk.ss_flags & SS_ONSTACK) : 241 ((sp - (size_t)td->td_sigstk.ss_sp) < td->td_sigstk.ss_size)) 242#else 243 ((sp - (size_t)td->td_sigstk.ss_sp) < td->td_sigstk.ss_size) 244#endif 245 : 0); 246} 247 248static __inline int 249sigprop(int sig) 250{ 251 252 if (sig > 0 && sig < NSIG) 253 return (sigproptbl[_SIG_IDX(sig)]); 254 return (0); 255} 256 257int 258sig_ffs(sigset_t *set) 259{ 260 int i; 261 262 for (i = 0; i < _SIG_WORDS; i++) 263 if (set->__bits[i]) 264 return (ffs(set->__bits[i]) + (i * 32)); 265 return (0); 266} 267 268/* 269 * kern_sigaction 270 * sigaction 271 * freebsd4_sigaction 272 * osigaction 273 * 274 * MPSAFE 275 */ 276int 277kern_sigaction(td, sig, act, oact, flags) 278 struct thread *td; 279 register int sig; 280 struct sigaction *act, *oact; 281 int flags; 282{ 283 struct sigacts *ps; 284 struct thread *td0; 285 struct proc *p = td->td_proc; 286 287 if (!_SIG_VALID(sig)) 288 return (EINVAL); 289 290 PROC_LOCK(p); 291 ps = p->p_sigacts; 292 mtx_lock(&ps->ps_mtx); 293 if (oact) { 294 oact->sa_handler = ps->ps_sigact[_SIG_IDX(sig)]; 295 oact->sa_mask = ps->ps_catchmask[_SIG_IDX(sig)]; 296 oact->sa_flags = 0; 297 if (SIGISMEMBER(ps->ps_sigonstack, sig)) 298 oact->sa_flags |= SA_ONSTACK; 299 if (!SIGISMEMBER(ps->ps_sigintr, sig)) 300 oact->sa_flags |= SA_RESTART; 301 if (SIGISMEMBER(ps->ps_sigreset, sig)) 302 oact->sa_flags |= SA_RESETHAND; 303 if (SIGISMEMBER(ps->ps_signodefer, sig)) 304 oact->sa_flags |= SA_NODEFER; 305 if (SIGISMEMBER(ps->ps_siginfo, sig)) 306 oact->sa_flags |= SA_SIGINFO; 307 if (sig == SIGCHLD && ps->ps_flag & PS_NOCLDSTOP) 308 oact->sa_flags |= SA_NOCLDSTOP; 309 if (sig == SIGCHLD && ps->ps_flag & PS_NOCLDWAIT) 310 oact->sa_flags |= SA_NOCLDWAIT; 311 } 312 if (act) { 313 if ((sig == SIGKILL || sig == SIGSTOP) && 314 act->sa_handler != SIG_DFL) { 315 mtx_unlock(&ps->ps_mtx); 316 PROC_UNLOCK(p); 317 return (EINVAL); 318 } 319 320 /* 321 * Change setting atomically. 322 */ 323 324 ps->ps_catchmask[_SIG_IDX(sig)] = act->sa_mask; 325 SIG_CANTMASK(ps->ps_catchmask[_SIG_IDX(sig)]); 326 if (act->sa_flags & SA_SIGINFO) { 327 ps->ps_sigact[_SIG_IDX(sig)] = 328 (__sighandler_t *)act->sa_sigaction; 329 SIGADDSET(ps->ps_siginfo, sig); 330 } else { 331 ps->ps_sigact[_SIG_IDX(sig)] = act->sa_handler; 332 SIGDELSET(ps->ps_siginfo, sig); 333 } 334 if (!(act->sa_flags & SA_RESTART)) 335 SIGADDSET(ps->ps_sigintr, sig); 336 else 337 SIGDELSET(ps->ps_sigintr, sig); 338 if (act->sa_flags & SA_ONSTACK) 339 SIGADDSET(ps->ps_sigonstack, sig); 340 else 341 SIGDELSET(ps->ps_sigonstack, sig); 342 if (act->sa_flags & SA_RESETHAND) 343 SIGADDSET(ps->ps_sigreset, sig); 344 else 345 SIGDELSET(ps->ps_sigreset, sig); 346 if (act->sa_flags & SA_NODEFER) 347 SIGADDSET(ps->ps_signodefer, sig); 348 else 349 SIGDELSET(ps->ps_signodefer, sig);
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350#ifdef COMPAT_SUNOS 351 if (act->sa_flags & SA_USERTRAMP) 352 SIGADDSET(ps->ps_usertramp, sig); 353 else 354 SIGDELSET(ps->ps_usertramp, sig); 355#endif
| |
356 if (sig == SIGCHLD) { 357 if (act->sa_flags & SA_NOCLDSTOP) 358 ps->ps_flag |= PS_NOCLDSTOP; 359 else 360 ps->ps_flag &= ~PS_NOCLDSTOP; 361 if (act->sa_flags & SA_NOCLDWAIT) { 362 /* 363 * Paranoia: since SA_NOCLDWAIT is implemented 364 * by reparenting the dying child to PID 1 (and 365 * trust it to reap the zombie), PID 1 itself 366 * is forbidden to set SA_NOCLDWAIT. 367 */ 368 if (p->p_pid == 1) 369 ps->ps_flag &= ~PS_NOCLDWAIT; 370 else 371 ps->ps_flag |= PS_NOCLDWAIT; 372 } else 373 ps->ps_flag &= ~PS_NOCLDWAIT; 374 if (ps->ps_sigact[_SIG_IDX(SIGCHLD)] == SIG_IGN) 375 ps->ps_flag |= PS_CLDSIGIGN; 376 else 377 ps->ps_flag &= ~PS_CLDSIGIGN; 378 } 379 /* 380 * Set bit in ps_sigignore for signals that are set to SIG_IGN, 381 * and for signals set to SIG_DFL where the default is to 382 * ignore. However, don't put SIGCONT in ps_sigignore, as we 383 * have to restart the process. 384 */ 385 if (ps->ps_sigact[_SIG_IDX(sig)] == SIG_IGN || 386 (sigprop(sig) & SA_IGNORE && 387 ps->ps_sigact[_SIG_IDX(sig)] == SIG_DFL)) { 388 if ((p->p_flag & P_SA) && 389 SIGISMEMBER(p->p_siglist, sig)) { 390 p->p_flag |= P_SIGEVENT; 391 wakeup(&p->p_siglist); 392 } 393 /* never to be seen again */ 394 SIGDELSET(p->p_siglist, sig); 395 mtx_lock_spin(&sched_lock); 396 FOREACH_THREAD_IN_PROC(p, td0) 397 SIGDELSET(td0->td_siglist, sig); 398 mtx_unlock_spin(&sched_lock); 399 if (sig != SIGCONT) 400 /* easier in psignal */ 401 SIGADDSET(ps->ps_sigignore, sig); 402 SIGDELSET(ps->ps_sigcatch, sig); 403 } else { 404 SIGDELSET(ps->ps_sigignore, sig); 405 if (ps->ps_sigact[_SIG_IDX(sig)] == SIG_DFL) 406 SIGDELSET(ps->ps_sigcatch, sig); 407 else 408 SIGADDSET(ps->ps_sigcatch, sig); 409 } 410#ifdef COMPAT_FREEBSD4 411 if (ps->ps_sigact[_SIG_IDX(sig)] == SIG_IGN || 412 ps->ps_sigact[_SIG_IDX(sig)] == SIG_DFL || 413 (flags & KSA_FREEBSD4) == 0) 414 SIGDELSET(ps->ps_freebsd4, sig); 415 else 416 SIGADDSET(ps->ps_freebsd4, sig); 417#endif 418#ifdef COMPAT_43 419 if (ps->ps_sigact[_SIG_IDX(sig)] == SIG_IGN || 420 ps->ps_sigact[_SIG_IDX(sig)] == SIG_DFL || 421 (flags & KSA_OSIGSET) == 0) 422 SIGDELSET(ps->ps_osigset, sig); 423 else 424 SIGADDSET(ps->ps_osigset, sig); 425#endif 426 } 427 mtx_unlock(&ps->ps_mtx); 428 PROC_UNLOCK(p); 429 return (0); 430} 431 432#ifndef _SYS_SYSPROTO_H_ 433struct sigaction_args { 434 int sig; 435 struct sigaction *act; 436 struct sigaction *oact; 437}; 438#endif 439/* 440 * MPSAFE 441 */ 442int 443sigaction(td, uap) 444 struct thread *td; 445 register struct sigaction_args *uap; 446{ 447 struct sigaction act, oact; 448 register struct sigaction *actp, *oactp; 449 int error; 450 451 actp = (uap->act != NULL) ? &act : NULL; 452 oactp = (uap->oact != NULL) ? &oact : NULL; 453 if (actp) { 454 error = copyin(uap->act, actp, sizeof(act)); 455 if (error) 456 return (error); 457 } 458 error = kern_sigaction(td, uap->sig, actp, oactp, 0); 459 if (oactp && !error) 460 error = copyout(oactp, uap->oact, sizeof(oact)); 461 return (error); 462} 463 464#ifdef COMPAT_FREEBSD4 465#ifndef _SYS_SYSPROTO_H_ 466struct freebsd4_sigaction_args { 467 int sig; 468 struct sigaction *act; 469 struct sigaction *oact; 470}; 471#endif 472/* 473 * MPSAFE 474 */ 475int 476freebsd4_sigaction(td, uap) 477 struct thread *td; 478 register struct freebsd4_sigaction_args *uap; 479{ 480 struct sigaction act, oact; 481 register struct sigaction *actp, *oactp; 482 int error; 483 484 485 actp = (uap->act != NULL) ? &act : NULL; 486 oactp = (uap->oact != NULL) ? &oact : NULL; 487 if (actp) { 488 error = copyin(uap->act, actp, sizeof(act)); 489 if (error) 490 return (error); 491 } 492 error = kern_sigaction(td, uap->sig, actp, oactp, KSA_FREEBSD4); 493 if (oactp && !error) 494 error = copyout(oactp, uap->oact, sizeof(oact)); 495 return (error); 496} 497#endif /* COMAPT_FREEBSD4 */ 498 499#ifdef COMPAT_43 /* XXX - COMPAT_FBSD3 */ 500#ifndef _SYS_SYSPROTO_H_ 501struct osigaction_args { 502 int signum; 503 struct osigaction *nsa; 504 struct osigaction *osa; 505}; 506#endif 507/* 508 * MPSAFE 509 */ 510int 511osigaction(td, uap) 512 struct thread *td; 513 register struct osigaction_args *uap; 514{ 515 struct osigaction sa; 516 struct sigaction nsa, osa; 517 register struct sigaction *nsap, *osap; 518 int error; 519 520 if (uap->signum <= 0 || uap->signum >= ONSIG) 521 return (EINVAL); 522 523 nsap = (uap->nsa != NULL) ? &nsa : NULL; 524 osap = (uap->osa != NULL) ? &osa : NULL; 525 526 if (nsap) { 527 error = copyin(uap->nsa, &sa, sizeof(sa)); 528 if (error) 529 return (error); 530 nsap->sa_handler = sa.sa_handler; 531 nsap->sa_flags = sa.sa_flags; 532 OSIG2SIG(sa.sa_mask, nsap->sa_mask); 533 } 534 error = kern_sigaction(td, uap->signum, nsap, osap, KSA_OSIGSET); 535 if (osap && !error) { 536 sa.sa_handler = osap->sa_handler; 537 sa.sa_flags = osap->sa_flags; 538 SIG2OSIG(osap->sa_mask, sa.sa_mask); 539 error = copyout(&sa, uap->osa, sizeof(sa)); 540 } 541 return (error); 542} 543 544#if !defined(__i386__) && !defined(__alpha__) 545/* Avoid replicating the same stub everywhere */ 546int 547osigreturn(td, uap) 548 struct thread *td; 549 struct osigreturn_args *uap; 550{ 551 552 return (nosys(td, (struct nosys_args *)uap)); 553} 554#endif 555#endif /* COMPAT_43 */ 556 557/* 558 * Initialize signal state for process 0; 559 * set to ignore signals that are ignored by default. 560 */ 561void 562siginit(p) 563 struct proc *p; 564{ 565 register int i; 566 struct sigacts *ps; 567 568 PROC_LOCK(p); 569 ps = p->p_sigacts; 570 mtx_lock(&ps->ps_mtx); 571 for (i = 1; i <= NSIG; i++) 572 if (sigprop(i) & SA_IGNORE && i != SIGCONT) 573 SIGADDSET(ps->ps_sigignore, i); 574 mtx_unlock(&ps->ps_mtx); 575 PROC_UNLOCK(p); 576} 577 578/* 579 * Reset signals for an exec of the specified process. 580 */ 581void 582execsigs(struct proc *p) 583{ 584 struct sigacts *ps; 585 int sig; 586 struct thread *td; 587 588 /* 589 * Reset caught signals. Held signals remain held 590 * through td_sigmask (unless they were caught, 591 * and are now ignored by default). 592 */ 593 PROC_LOCK_ASSERT(p, MA_OWNED); 594 td = FIRST_THREAD_IN_PROC(p); 595 ps = p->p_sigacts; 596 mtx_lock(&ps->ps_mtx); 597 while (SIGNOTEMPTY(ps->ps_sigcatch)) { 598 sig = sig_ffs(&ps->ps_sigcatch); 599 SIGDELSET(ps->ps_sigcatch, sig); 600 if (sigprop(sig) & SA_IGNORE) { 601 if (sig != SIGCONT) 602 SIGADDSET(ps->ps_sigignore, sig); 603 SIGDELSET(p->p_siglist, sig); 604 /* 605 * There is only one thread at this point. 606 */ 607 SIGDELSET(td->td_siglist, sig); 608 } 609 ps->ps_sigact[_SIG_IDX(sig)] = SIG_DFL; 610 } 611 /* 612 * Reset stack state to the user stack. 613 * Clear set of signals caught on the signal stack. 614 */ 615 td->td_sigstk.ss_flags = SS_DISABLE; 616 td->td_sigstk.ss_size = 0; 617 td->td_sigstk.ss_sp = 0; 618 td->td_pflags &= ~TDP_ALTSTACK; 619 /* 620 * Reset no zombies if child dies flag as Solaris does. 621 */ 622 ps->ps_flag &= ~(PS_NOCLDWAIT | PS_CLDSIGIGN); 623 if (ps->ps_sigact[_SIG_IDX(SIGCHLD)] == SIG_IGN) 624 ps->ps_sigact[_SIG_IDX(SIGCHLD)] = SIG_DFL; 625 mtx_unlock(&ps->ps_mtx); 626} 627 628/* 629 * kern_sigprocmask() 630 * 631 * Manipulate signal mask. 632 */ 633int 634kern_sigprocmask(td, how, set, oset, old) 635 struct thread *td; 636 int how; 637 sigset_t *set, *oset; 638 int old; 639{ 640 int error; 641 642 PROC_LOCK(td->td_proc); 643 if (oset != NULL) 644 *oset = td->td_sigmask; 645 646 error = 0; 647 if (set != NULL) { 648 switch (how) { 649 case SIG_BLOCK: 650 SIG_CANTMASK(*set); 651 SIGSETOR(td->td_sigmask, *set); 652 break; 653 case SIG_UNBLOCK: 654 SIGSETNAND(td->td_sigmask, *set); 655 signotify(td); 656 break; 657 case SIG_SETMASK: 658 SIG_CANTMASK(*set); 659 if (old) 660 SIGSETLO(td->td_sigmask, *set); 661 else 662 td->td_sigmask = *set; 663 signotify(td); 664 break; 665 default: 666 error = EINVAL; 667 break; 668 } 669 } 670 PROC_UNLOCK(td->td_proc); 671 return (error); 672} 673 674/* 675 * sigprocmask() - MP SAFE 676 */ 677 678#ifndef _SYS_SYSPROTO_H_ 679struct sigprocmask_args { 680 int how; 681 const sigset_t *set; 682 sigset_t *oset; 683}; 684#endif 685int 686sigprocmask(td, uap) 687 register struct thread *td; 688 struct sigprocmask_args *uap; 689{ 690 sigset_t set, oset; 691 sigset_t *setp, *osetp; 692 int error; 693 694 setp = (uap->set != NULL) ? &set : NULL; 695 osetp = (uap->oset != NULL) ? &oset : NULL; 696 if (setp) { 697 error = copyin(uap->set, setp, sizeof(set)); 698 if (error) 699 return (error); 700 } 701 error = kern_sigprocmask(td, uap->how, setp, osetp, 0); 702 if (osetp && !error) { 703 error = copyout(osetp, uap->oset, sizeof(oset)); 704 } 705 return (error); 706} 707 708#ifdef COMPAT_43 /* XXX - COMPAT_FBSD3 */ 709/* 710 * osigprocmask() - MP SAFE 711 */ 712#ifndef _SYS_SYSPROTO_H_ 713struct osigprocmask_args { 714 int how; 715 osigset_t mask; 716}; 717#endif 718int 719osigprocmask(td, uap) 720 register struct thread *td; 721 struct osigprocmask_args *uap; 722{ 723 sigset_t set, oset; 724 int error; 725 726 OSIG2SIG(uap->mask, set); 727 error = kern_sigprocmask(td, uap->how, &set, &oset, 1); 728 SIG2OSIG(oset, td->td_retval[0]); 729 return (error); 730} 731#endif /* COMPAT_43 */ 732 733#ifndef _SYS_SYSPROTO_H_ 734struct sigpending_args { 735 sigset_t *set; 736}; 737#endif 738/* 739 * MPSAFE 740 */ 741int 742sigwait(struct thread *td, struct sigwait_args *uap) 743{ 744 siginfo_t info; 745 sigset_t set; 746 int error; 747 748 error = copyin(uap->set, &set, sizeof(set)); 749 if (error) { 750 td->td_retval[0] = error; 751 return (0); 752 } 753 754 error = kern_sigtimedwait(td, set, &info, NULL); 755 if (error) { 756 if (error == ERESTART) 757 return (error); 758 td->td_retval[0] = error; 759 return (0); 760 } 761 762 error = copyout(&info.si_signo, uap->sig, sizeof(info.si_signo)); 763 /* Repost if we got an error. */ 764 if (error && info.si_signo) { 765 PROC_LOCK(td->td_proc); 766 tdsignal(td, info.si_signo, SIGTARGET_TD); 767 PROC_UNLOCK(td->td_proc); 768 } 769 td->td_retval[0] = error; 770 return (0); 771} 772/* 773 * MPSAFE 774 */ 775int 776sigtimedwait(struct thread *td, struct sigtimedwait_args *uap) 777{ 778 struct timespec ts; 779 struct timespec *timeout; 780 sigset_t set; 781 siginfo_t info; 782 int error; 783 784 if (uap->timeout) { 785 error = copyin(uap->timeout, &ts, sizeof(ts)); 786 if (error) 787 return (error); 788 789 timeout = &ts; 790 } else 791 timeout = NULL; 792 793 error = copyin(uap->set, &set, sizeof(set)); 794 if (error) 795 return (error); 796 797 error = kern_sigtimedwait(td, set, &info, timeout); 798 if (error) 799 return (error); 800 801 if (uap->info) 802 error = copyout(&info, uap->info, sizeof(info)); 803 /* Repost if we got an error. */ 804 if (error && info.si_signo) { 805 PROC_LOCK(td->td_proc); 806 tdsignal(td, info.si_signo, SIGTARGET_TD); 807 PROC_UNLOCK(td->td_proc); 808 } else { 809 td->td_retval[0] = info.si_signo; 810 } 811 return (error); 812} 813 814/* 815 * MPSAFE 816 */ 817int 818sigwaitinfo(struct thread *td, struct sigwaitinfo_args *uap) 819{ 820 siginfo_t info; 821 sigset_t set; 822 int error; 823 824 error = copyin(uap->set, &set, sizeof(set)); 825 if (error) 826 return (error); 827 828 error = kern_sigtimedwait(td, set, &info, NULL); 829 if (error) 830 return (error); 831 832 if (uap->info) 833 error = copyout(&info, uap->info, sizeof(info)); 834 /* Repost if we got an error. */ 835 if (error && info.si_signo) { 836 PROC_LOCK(td->td_proc); 837 tdsignal(td, info.si_signo, SIGTARGET_TD); 838 PROC_UNLOCK(td->td_proc); 839 } else { 840 td->td_retval[0] = info.si_signo; 841 } 842 return (error); 843} 844 845static int 846kern_sigtimedwait(struct thread *td, sigset_t waitset, siginfo_t *info, 847 struct timespec *timeout) 848{ 849 struct sigacts *ps; 850 sigset_t savedmask, sigset; 851 struct proc *p; 852 int error; 853 int sig; 854 int hz; 855 int i; 856 857 p = td->td_proc; 858 error = 0; 859 sig = 0; 860 SIG_CANTMASK(waitset); 861 862 PROC_LOCK(p); 863 ps = p->p_sigacts; 864 savedmask = td->td_sigmask; 865 866again: 867 for (i = 1; i <= _SIG_MAXSIG; ++i) { 868 if (!SIGISMEMBER(waitset, i)) 869 continue; 870 if (SIGISMEMBER(td->td_siglist, i)) { 871 SIGFILLSET(td->td_sigmask); 872 SIG_CANTMASK(td->td_sigmask); 873 SIGDELSET(td->td_sigmask, i); 874 mtx_lock(&ps->ps_mtx); 875 sig = cursig(td); 876 i = 0; 877 mtx_unlock(&ps->ps_mtx); 878 } else if (SIGISMEMBER(p->p_siglist, i)) { 879 if (p->p_flag & P_SA) { 880 p->p_flag |= P_SIGEVENT; 881 wakeup(&p->p_siglist); 882 } 883 SIGDELSET(p->p_siglist, i); 884 SIGADDSET(td->td_siglist, i); 885 SIGFILLSET(td->td_sigmask); 886 SIG_CANTMASK(td->td_sigmask); 887 SIGDELSET(td->td_sigmask, i); 888 mtx_lock(&ps->ps_mtx); 889 sig = cursig(td); 890 i = 0; 891 mtx_unlock(&ps->ps_mtx); 892 } 893 if (sig) { 894 td->td_sigmask = savedmask; 895 signotify(td); 896 goto out; 897 } 898 } 899 if (error) 900 goto out; 901 902 td->td_sigmask = savedmask; 903 signotify(td); 904 sigset = td->td_siglist; 905 SIGSETOR(sigset, p->p_siglist); 906 SIGSETAND(sigset, waitset); 907 if (!SIGISEMPTY(sigset)) 908 goto again; 909 910 /* 911 * POSIX says this must be checked after looking for pending 912 * signals. 913 */ 914 if (timeout) { 915 struct timeval tv; 916 917 if (timeout->tv_nsec < 0 || timeout->tv_nsec > 1000000000) { 918 error = EINVAL; 919 goto out; 920 } 921 if (timeout->tv_sec == 0 && timeout->tv_nsec == 0) { 922 error = EAGAIN; 923 goto out; 924 } 925 TIMESPEC_TO_TIMEVAL(&tv, timeout); 926 hz = tvtohz(&tv); 927 } else 928 hz = 0; 929 930 td->td_waitset = &waitset; 931 error = msleep(&ps, &p->p_mtx, PPAUSE|PCATCH, "sigwait", hz); 932 td->td_waitset = NULL; 933 if (error == 0) /* surplus wakeup ? */ 934 error = EINTR; 935 goto again; 936 937out: 938 if (sig) { 939 sig_t action; 940 941 error = 0; 942 mtx_lock(&ps->ps_mtx); 943 action = ps->ps_sigact[_SIG_IDX(sig)]; 944 mtx_unlock(&ps->ps_mtx); 945#ifdef KTRACE 946 if (KTRPOINT(td, KTR_PSIG)) 947 ktrpsig(sig, action, &td->td_sigmask, 0); 948#endif 949 _STOPEVENT(p, S_SIG, sig); 950 951 SIGDELSET(td->td_siglist, sig); 952 info->si_signo = sig; 953 info->si_code = 0; 954 } 955 PROC_UNLOCK(p); 956 return (error); 957} 958 959/* 960 * MPSAFE 961 */ 962int 963sigpending(td, uap) 964 struct thread *td; 965 struct sigpending_args *uap; 966{ 967 struct proc *p = td->td_proc; 968 sigset_t siglist; 969 970 PROC_LOCK(p); 971 siglist = p->p_siglist; 972 SIGSETOR(siglist, td->td_siglist); 973 PROC_UNLOCK(p); 974 return (copyout(&siglist, uap->set, sizeof(sigset_t))); 975} 976 977#ifdef COMPAT_43 /* XXX - COMPAT_FBSD3 */ 978#ifndef _SYS_SYSPROTO_H_ 979struct osigpending_args { 980 int dummy; 981}; 982#endif 983/* 984 * MPSAFE 985 */ 986int 987osigpending(td, uap) 988 struct thread *td; 989 struct osigpending_args *uap; 990{ 991 struct proc *p = td->td_proc; 992 sigset_t siglist; 993 994 PROC_LOCK(p); 995 siglist = p->p_siglist; 996 SIGSETOR(siglist, td->td_siglist); 997 PROC_UNLOCK(p); 998 SIG2OSIG(siglist, td->td_retval[0]); 999 return (0); 1000} 1001#endif /* COMPAT_43 */ 1002
| 350 if (sig == SIGCHLD) { 351 if (act->sa_flags & SA_NOCLDSTOP) 352 ps->ps_flag |= PS_NOCLDSTOP; 353 else 354 ps->ps_flag &= ~PS_NOCLDSTOP; 355 if (act->sa_flags & SA_NOCLDWAIT) { 356 /* 357 * Paranoia: since SA_NOCLDWAIT is implemented 358 * by reparenting the dying child to PID 1 (and 359 * trust it to reap the zombie), PID 1 itself 360 * is forbidden to set SA_NOCLDWAIT. 361 */ 362 if (p->p_pid == 1) 363 ps->ps_flag &= ~PS_NOCLDWAIT; 364 else 365 ps->ps_flag |= PS_NOCLDWAIT; 366 } else 367 ps->ps_flag &= ~PS_NOCLDWAIT; 368 if (ps->ps_sigact[_SIG_IDX(SIGCHLD)] == SIG_IGN) 369 ps->ps_flag |= PS_CLDSIGIGN; 370 else 371 ps->ps_flag &= ~PS_CLDSIGIGN; 372 } 373 /* 374 * Set bit in ps_sigignore for signals that are set to SIG_IGN, 375 * and for signals set to SIG_DFL where the default is to 376 * ignore. However, don't put SIGCONT in ps_sigignore, as we 377 * have to restart the process. 378 */ 379 if (ps->ps_sigact[_SIG_IDX(sig)] == SIG_IGN || 380 (sigprop(sig) & SA_IGNORE && 381 ps->ps_sigact[_SIG_IDX(sig)] == SIG_DFL)) { 382 if ((p->p_flag & P_SA) && 383 SIGISMEMBER(p->p_siglist, sig)) { 384 p->p_flag |= P_SIGEVENT; 385 wakeup(&p->p_siglist); 386 } 387 /* never to be seen again */ 388 SIGDELSET(p->p_siglist, sig); 389 mtx_lock_spin(&sched_lock); 390 FOREACH_THREAD_IN_PROC(p, td0) 391 SIGDELSET(td0->td_siglist, sig); 392 mtx_unlock_spin(&sched_lock); 393 if (sig != SIGCONT) 394 /* easier in psignal */ 395 SIGADDSET(ps->ps_sigignore, sig); 396 SIGDELSET(ps->ps_sigcatch, sig); 397 } else { 398 SIGDELSET(ps->ps_sigignore, sig); 399 if (ps->ps_sigact[_SIG_IDX(sig)] == SIG_DFL) 400 SIGDELSET(ps->ps_sigcatch, sig); 401 else 402 SIGADDSET(ps->ps_sigcatch, sig); 403 } 404#ifdef COMPAT_FREEBSD4 405 if (ps->ps_sigact[_SIG_IDX(sig)] == SIG_IGN || 406 ps->ps_sigact[_SIG_IDX(sig)] == SIG_DFL || 407 (flags & KSA_FREEBSD4) == 0) 408 SIGDELSET(ps->ps_freebsd4, sig); 409 else 410 SIGADDSET(ps->ps_freebsd4, sig); 411#endif 412#ifdef COMPAT_43 413 if (ps->ps_sigact[_SIG_IDX(sig)] == SIG_IGN || 414 ps->ps_sigact[_SIG_IDX(sig)] == SIG_DFL || 415 (flags & KSA_OSIGSET) == 0) 416 SIGDELSET(ps->ps_osigset, sig); 417 else 418 SIGADDSET(ps->ps_osigset, sig); 419#endif 420 } 421 mtx_unlock(&ps->ps_mtx); 422 PROC_UNLOCK(p); 423 return (0); 424} 425 426#ifndef _SYS_SYSPROTO_H_ 427struct sigaction_args { 428 int sig; 429 struct sigaction *act; 430 struct sigaction *oact; 431}; 432#endif 433/* 434 * MPSAFE 435 */ 436int 437sigaction(td, uap) 438 struct thread *td; 439 register struct sigaction_args *uap; 440{ 441 struct sigaction act, oact; 442 register struct sigaction *actp, *oactp; 443 int error; 444 445 actp = (uap->act != NULL) ? &act : NULL; 446 oactp = (uap->oact != NULL) ? &oact : NULL; 447 if (actp) { 448 error = copyin(uap->act, actp, sizeof(act)); 449 if (error) 450 return (error); 451 } 452 error = kern_sigaction(td, uap->sig, actp, oactp, 0); 453 if (oactp && !error) 454 error = copyout(oactp, uap->oact, sizeof(oact)); 455 return (error); 456} 457 458#ifdef COMPAT_FREEBSD4 459#ifndef _SYS_SYSPROTO_H_ 460struct freebsd4_sigaction_args { 461 int sig; 462 struct sigaction *act; 463 struct sigaction *oact; 464}; 465#endif 466/* 467 * MPSAFE 468 */ 469int 470freebsd4_sigaction(td, uap) 471 struct thread *td; 472 register struct freebsd4_sigaction_args *uap; 473{ 474 struct sigaction act, oact; 475 register struct sigaction *actp, *oactp; 476 int error; 477 478 479 actp = (uap->act != NULL) ? &act : NULL; 480 oactp = (uap->oact != NULL) ? &oact : NULL; 481 if (actp) { 482 error = copyin(uap->act, actp, sizeof(act)); 483 if (error) 484 return (error); 485 } 486 error = kern_sigaction(td, uap->sig, actp, oactp, KSA_FREEBSD4); 487 if (oactp && !error) 488 error = copyout(oactp, uap->oact, sizeof(oact)); 489 return (error); 490} 491#endif /* COMAPT_FREEBSD4 */ 492 493#ifdef COMPAT_43 /* XXX - COMPAT_FBSD3 */ 494#ifndef _SYS_SYSPROTO_H_ 495struct osigaction_args { 496 int signum; 497 struct osigaction *nsa; 498 struct osigaction *osa; 499}; 500#endif 501/* 502 * MPSAFE 503 */ 504int 505osigaction(td, uap) 506 struct thread *td; 507 register struct osigaction_args *uap; 508{ 509 struct osigaction sa; 510 struct sigaction nsa, osa; 511 register struct sigaction *nsap, *osap; 512 int error; 513 514 if (uap->signum <= 0 || uap->signum >= ONSIG) 515 return (EINVAL); 516 517 nsap = (uap->nsa != NULL) ? &nsa : NULL; 518 osap = (uap->osa != NULL) ? &osa : NULL; 519 520 if (nsap) { 521 error = copyin(uap->nsa, &sa, sizeof(sa)); 522 if (error) 523 return (error); 524 nsap->sa_handler = sa.sa_handler; 525 nsap->sa_flags = sa.sa_flags; 526 OSIG2SIG(sa.sa_mask, nsap->sa_mask); 527 } 528 error = kern_sigaction(td, uap->signum, nsap, osap, KSA_OSIGSET); 529 if (osap && !error) { 530 sa.sa_handler = osap->sa_handler; 531 sa.sa_flags = osap->sa_flags; 532 SIG2OSIG(osap->sa_mask, sa.sa_mask); 533 error = copyout(&sa, uap->osa, sizeof(sa)); 534 } 535 return (error); 536} 537 538#if !defined(__i386__) && !defined(__alpha__) 539/* Avoid replicating the same stub everywhere */ 540int 541osigreturn(td, uap) 542 struct thread *td; 543 struct osigreturn_args *uap; 544{ 545 546 return (nosys(td, (struct nosys_args *)uap)); 547} 548#endif 549#endif /* COMPAT_43 */ 550 551/* 552 * Initialize signal state for process 0; 553 * set to ignore signals that are ignored by default. 554 */ 555void 556siginit(p) 557 struct proc *p; 558{ 559 register int i; 560 struct sigacts *ps; 561 562 PROC_LOCK(p); 563 ps = p->p_sigacts; 564 mtx_lock(&ps->ps_mtx); 565 for (i = 1; i <= NSIG; i++) 566 if (sigprop(i) & SA_IGNORE && i != SIGCONT) 567 SIGADDSET(ps->ps_sigignore, i); 568 mtx_unlock(&ps->ps_mtx); 569 PROC_UNLOCK(p); 570} 571 572/* 573 * Reset signals for an exec of the specified process. 574 */ 575void 576execsigs(struct proc *p) 577{ 578 struct sigacts *ps; 579 int sig; 580 struct thread *td; 581 582 /* 583 * Reset caught signals. Held signals remain held 584 * through td_sigmask (unless they were caught, 585 * and are now ignored by default). 586 */ 587 PROC_LOCK_ASSERT(p, MA_OWNED); 588 td = FIRST_THREAD_IN_PROC(p); 589 ps = p->p_sigacts; 590 mtx_lock(&ps->ps_mtx); 591 while (SIGNOTEMPTY(ps->ps_sigcatch)) { 592 sig = sig_ffs(&ps->ps_sigcatch); 593 SIGDELSET(ps->ps_sigcatch, sig); 594 if (sigprop(sig) & SA_IGNORE) { 595 if (sig != SIGCONT) 596 SIGADDSET(ps->ps_sigignore, sig); 597 SIGDELSET(p->p_siglist, sig); 598 /* 599 * There is only one thread at this point. 600 */ 601 SIGDELSET(td->td_siglist, sig); 602 } 603 ps->ps_sigact[_SIG_IDX(sig)] = SIG_DFL; 604 } 605 /* 606 * Reset stack state to the user stack. 607 * Clear set of signals caught on the signal stack. 608 */ 609 td->td_sigstk.ss_flags = SS_DISABLE; 610 td->td_sigstk.ss_size = 0; 611 td->td_sigstk.ss_sp = 0; 612 td->td_pflags &= ~TDP_ALTSTACK; 613 /* 614 * Reset no zombies if child dies flag as Solaris does. 615 */ 616 ps->ps_flag &= ~(PS_NOCLDWAIT | PS_CLDSIGIGN); 617 if (ps->ps_sigact[_SIG_IDX(SIGCHLD)] == SIG_IGN) 618 ps->ps_sigact[_SIG_IDX(SIGCHLD)] = SIG_DFL; 619 mtx_unlock(&ps->ps_mtx); 620} 621 622/* 623 * kern_sigprocmask() 624 * 625 * Manipulate signal mask. 626 */ 627int 628kern_sigprocmask(td, how, set, oset, old) 629 struct thread *td; 630 int how; 631 sigset_t *set, *oset; 632 int old; 633{ 634 int error; 635 636 PROC_LOCK(td->td_proc); 637 if (oset != NULL) 638 *oset = td->td_sigmask; 639 640 error = 0; 641 if (set != NULL) { 642 switch (how) { 643 case SIG_BLOCK: 644 SIG_CANTMASK(*set); 645 SIGSETOR(td->td_sigmask, *set); 646 break; 647 case SIG_UNBLOCK: 648 SIGSETNAND(td->td_sigmask, *set); 649 signotify(td); 650 break; 651 case SIG_SETMASK: 652 SIG_CANTMASK(*set); 653 if (old) 654 SIGSETLO(td->td_sigmask, *set); 655 else 656 td->td_sigmask = *set; 657 signotify(td); 658 break; 659 default: 660 error = EINVAL; 661 break; 662 } 663 } 664 PROC_UNLOCK(td->td_proc); 665 return (error); 666} 667 668/* 669 * sigprocmask() - MP SAFE 670 */ 671 672#ifndef _SYS_SYSPROTO_H_ 673struct sigprocmask_args { 674 int how; 675 const sigset_t *set; 676 sigset_t *oset; 677}; 678#endif 679int 680sigprocmask(td, uap) 681 register struct thread *td; 682 struct sigprocmask_args *uap; 683{ 684 sigset_t set, oset; 685 sigset_t *setp, *osetp; 686 int error; 687 688 setp = (uap->set != NULL) ? &set : NULL; 689 osetp = (uap->oset != NULL) ? &oset : NULL; 690 if (setp) { 691 error = copyin(uap->set, setp, sizeof(set)); 692 if (error) 693 return (error); 694 } 695 error = kern_sigprocmask(td, uap->how, setp, osetp, 0); 696 if (osetp && !error) { 697 error = copyout(osetp, uap->oset, sizeof(oset)); 698 } 699 return (error); 700} 701 702#ifdef COMPAT_43 /* XXX - COMPAT_FBSD3 */ 703/* 704 * osigprocmask() - MP SAFE 705 */ 706#ifndef _SYS_SYSPROTO_H_ 707struct osigprocmask_args { 708 int how; 709 osigset_t mask; 710}; 711#endif 712int 713osigprocmask(td, uap) 714 register struct thread *td; 715 struct osigprocmask_args *uap; 716{ 717 sigset_t set, oset; 718 int error; 719 720 OSIG2SIG(uap->mask, set); 721 error = kern_sigprocmask(td, uap->how, &set, &oset, 1); 722 SIG2OSIG(oset, td->td_retval[0]); 723 return (error); 724} 725#endif /* COMPAT_43 */ 726 727#ifndef _SYS_SYSPROTO_H_ 728struct sigpending_args { 729 sigset_t *set; 730}; 731#endif 732/* 733 * MPSAFE 734 */ 735int 736sigwait(struct thread *td, struct sigwait_args *uap) 737{ 738 siginfo_t info; 739 sigset_t set; 740 int error; 741 742 error = copyin(uap->set, &set, sizeof(set)); 743 if (error) { 744 td->td_retval[0] = error; 745 return (0); 746 } 747 748 error = kern_sigtimedwait(td, set, &info, NULL); 749 if (error) { 750 if (error == ERESTART) 751 return (error); 752 td->td_retval[0] = error; 753 return (0); 754 } 755 756 error = copyout(&info.si_signo, uap->sig, sizeof(info.si_signo)); 757 /* Repost if we got an error. */ 758 if (error && info.si_signo) { 759 PROC_LOCK(td->td_proc); 760 tdsignal(td, info.si_signo, SIGTARGET_TD); 761 PROC_UNLOCK(td->td_proc); 762 } 763 td->td_retval[0] = error; 764 return (0); 765} 766/* 767 * MPSAFE 768 */ 769int 770sigtimedwait(struct thread *td, struct sigtimedwait_args *uap) 771{ 772 struct timespec ts; 773 struct timespec *timeout; 774 sigset_t set; 775 siginfo_t info; 776 int error; 777 778 if (uap->timeout) { 779 error = copyin(uap->timeout, &ts, sizeof(ts)); 780 if (error) 781 return (error); 782 783 timeout = &ts; 784 } else 785 timeout = NULL; 786 787 error = copyin(uap->set, &set, sizeof(set)); 788 if (error) 789 return (error); 790 791 error = kern_sigtimedwait(td, set, &info, timeout); 792 if (error) 793 return (error); 794 795 if (uap->info) 796 error = copyout(&info, uap->info, sizeof(info)); 797 /* Repost if we got an error. */ 798 if (error && info.si_signo) { 799 PROC_LOCK(td->td_proc); 800 tdsignal(td, info.si_signo, SIGTARGET_TD); 801 PROC_UNLOCK(td->td_proc); 802 } else { 803 td->td_retval[0] = info.si_signo; 804 } 805 return (error); 806} 807 808/* 809 * MPSAFE 810 */ 811int 812sigwaitinfo(struct thread *td, struct sigwaitinfo_args *uap) 813{ 814 siginfo_t info; 815 sigset_t set; 816 int error; 817 818 error = copyin(uap->set, &set, sizeof(set)); 819 if (error) 820 return (error); 821 822 error = kern_sigtimedwait(td, set, &info, NULL); 823 if (error) 824 return (error); 825 826 if (uap->info) 827 error = copyout(&info, uap->info, sizeof(info)); 828 /* Repost if we got an error. */ 829 if (error && info.si_signo) { 830 PROC_LOCK(td->td_proc); 831 tdsignal(td, info.si_signo, SIGTARGET_TD); 832 PROC_UNLOCK(td->td_proc); 833 } else { 834 td->td_retval[0] = info.si_signo; 835 } 836 return (error); 837} 838 839static int 840kern_sigtimedwait(struct thread *td, sigset_t waitset, siginfo_t *info, 841 struct timespec *timeout) 842{ 843 struct sigacts *ps; 844 sigset_t savedmask, sigset; 845 struct proc *p; 846 int error; 847 int sig; 848 int hz; 849 int i; 850 851 p = td->td_proc; 852 error = 0; 853 sig = 0; 854 SIG_CANTMASK(waitset); 855 856 PROC_LOCK(p); 857 ps = p->p_sigacts; 858 savedmask = td->td_sigmask; 859 860again: 861 for (i = 1; i <= _SIG_MAXSIG; ++i) { 862 if (!SIGISMEMBER(waitset, i)) 863 continue; 864 if (SIGISMEMBER(td->td_siglist, i)) { 865 SIGFILLSET(td->td_sigmask); 866 SIG_CANTMASK(td->td_sigmask); 867 SIGDELSET(td->td_sigmask, i); 868 mtx_lock(&ps->ps_mtx); 869 sig = cursig(td); 870 i = 0; 871 mtx_unlock(&ps->ps_mtx); 872 } else if (SIGISMEMBER(p->p_siglist, i)) { 873 if (p->p_flag & P_SA) { 874 p->p_flag |= P_SIGEVENT; 875 wakeup(&p->p_siglist); 876 } 877 SIGDELSET(p->p_siglist, i); 878 SIGADDSET(td->td_siglist, i); 879 SIGFILLSET(td->td_sigmask); 880 SIG_CANTMASK(td->td_sigmask); 881 SIGDELSET(td->td_sigmask, i); 882 mtx_lock(&ps->ps_mtx); 883 sig = cursig(td); 884 i = 0; 885 mtx_unlock(&ps->ps_mtx); 886 } 887 if (sig) { 888 td->td_sigmask = savedmask; 889 signotify(td); 890 goto out; 891 } 892 } 893 if (error) 894 goto out; 895 896 td->td_sigmask = savedmask; 897 signotify(td); 898 sigset = td->td_siglist; 899 SIGSETOR(sigset, p->p_siglist); 900 SIGSETAND(sigset, waitset); 901 if (!SIGISEMPTY(sigset)) 902 goto again; 903 904 /* 905 * POSIX says this must be checked after looking for pending 906 * signals. 907 */ 908 if (timeout) { 909 struct timeval tv; 910 911 if (timeout->tv_nsec < 0 || timeout->tv_nsec > 1000000000) { 912 error = EINVAL; 913 goto out; 914 } 915 if (timeout->tv_sec == 0 && timeout->tv_nsec == 0) { 916 error = EAGAIN; 917 goto out; 918 } 919 TIMESPEC_TO_TIMEVAL(&tv, timeout); 920 hz = tvtohz(&tv); 921 } else 922 hz = 0; 923 924 td->td_waitset = &waitset; 925 error = msleep(&ps, &p->p_mtx, PPAUSE|PCATCH, "sigwait", hz); 926 td->td_waitset = NULL; 927 if (error == 0) /* surplus wakeup ? */ 928 error = EINTR; 929 goto again; 930 931out: 932 if (sig) { 933 sig_t action; 934 935 error = 0; 936 mtx_lock(&ps->ps_mtx); 937 action = ps->ps_sigact[_SIG_IDX(sig)]; 938 mtx_unlock(&ps->ps_mtx); 939#ifdef KTRACE 940 if (KTRPOINT(td, KTR_PSIG)) 941 ktrpsig(sig, action, &td->td_sigmask, 0); 942#endif 943 _STOPEVENT(p, S_SIG, sig); 944 945 SIGDELSET(td->td_siglist, sig); 946 info->si_signo = sig; 947 info->si_code = 0; 948 } 949 PROC_UNLOCK(p); 950 return (error); 951} 952 953/* 954 * MPSAFE 955 */ 956int 957sigpending(td, uap) 958 struct thread *td; 959 struct sigpending_args *uap; 960{ 961 struct proc *p = td->td_proc; 962 sigset_t siglist; 963 964 PROC_LOCK(p); 965 siglist = p->p_siglist; 966 SIGSETOR(siglist, td->td_siglist); 967 PROC_UNLOCK(p); 968 return (copyout(&siglist, uap->set, sizeof(sigset_t))); 969} 970 971#ifdef COMPAT_43 /* XXX - COMPAT_FBSD3 */ 972#ifndef _SYS_SYSPROTO_H_ 973struct osigpending_args { 974 int dummy; 975}; 976#endif 977/* 978 * MPSAFE 979 */ 980int 981osigpending(td, uap) 982 struct thread *td; 983 struct osigpending_args *uap; 984{ 985 struct proc *p = td->td_proc; 986 sigset_t siglist; 987 988 PROC_LOCK(p); 989 siglist = p->p_siglist; 990 SIGSETOR(siglist, td->td_siglist); 991 PROC_UNLOCK(p); 992 SIG2OSIG(siglist, td->td_retval[0]); 993 return (0); 994} 995#endif /* COMPAT_43 */ 996
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1003#if defined(COMPAT_43) || defined(COMPAT_SUNOS)
| 997#if defined(COMPAT_43)
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1004/* 1005 * Generalized interface signal handler, 4.3-compatible. 1006 */ 1007#ifndef _SYS_SYSPROTO_H_ 1008struct osigvec_args { 1009 int signum; 1010 struct sigvec *nsv; 1011 struct sigvec *osv; 1012}; 1013#endif 1014/* 1015 * MPSAFE 1016 */ 1017/* ARGSUSED */ 1018int 1019osigvec(td, uap) 1020 struct thread *td; 1021 register struct osigvec_args *uap; 1022{ 1023 struct sigvec vec; 1024 struct sigaction nsa, osa; 1025 register struct sigaction *nsap, *osap; 1026 int error; 1027 1028 if (uap->signum <= 0 || uap->signum >= ONSIG) 1029 return (EINVAL); 1030 nsap = (uap->nsv != NULL) ? &nsa : NULL; 1031 osap = (uap->osv != NULL) ? &osa : NULL; 1032 if (nsap) { 1033 error = copyin(uap->nsv, &vec, sizeof(vec)); 1034 if (error) 1035 return (error); 1036 nsap->sa_handler = vec.sv_handler; 1037 OSIG2SIG(vec.sv_mask, nsap->sa_mask); 1038 nsap->sa_flags = vec.sv_flags; 1039 nsap->sa_flags ^= SA_RESTART; /* opposite of SV_INTERRUPT */
| 998/* 999 * Generalized interface signal handler, 4.3-compatible. 1000 */ 1001#ifndef _SYS_SYSPROTO_H_ 1002struct osigvec_args { 1003 int signum; 1004 struct sigvec *nsv; 1005 struct sigvec *osv; 1006}; 1007#endif 1008/* 1009 * MPSAFE 1010 */ 1011/* ARGSUSED */ 1012int 1013osigvec(td, uap) 1014 struct thread *td; 1015 register struct osigvec_args *uap; 1016{ 1017 struct sigvec vec; 1018 struct sigaction nsa, osa; 1019 register struct sigaction *nsap, *osap; 1020 int error; 1021 1022 if (uap->signum <= 0 || uap->signum >= ONSIG) 1023 return (EINVAL); 1024 nsap = (uap->nsv != NULL) ? &nsa : NULL; 1025 osap = (uap->osv != NULL) ? &osa : NULL; 1026 if (nsap) { 1027 error = copyin(uap->nsv, &vec, sizeof(vec)); 1028 if (error) 1029 return (error); 1030 nsap->sa_handler = vec.sv_handler; 1031 OSIG2SIG(vec.sv_mask, nsap->sa_mask); 1032 nsap->sa_flags = vec.sv_flags; 1033 nsap->sa_flags ^= SA_RESTART; /* opposite of SV_INTERRUPT */
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1040#ifdef COMPAT_SUNOS 1041 nsap->sa_flags |= SA_USERTRAMP; 1042#endif
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1043 } 1044 error = kern_sigaction(td, uap->signum, nsap, osap, KSA_OSIGSET); 1045 if (osap && !error) { 1046 vec.sv_handler = osap->sa_handler; 1047 SIG2OSIG(osap->sa_mask, vec.sv_mask); 1048 vec.sv_flags = osap->sa_flags; 1049 vec.sv_flags &= ~SA_NOCLDWAIT; 1050 vec.sv_flags ^= SA_RESTART;
| 1034 } 1035 error = kern_sigaction(td, uap->signum, nsap, osap, KSA_OSIGSET); 1036 if (osap && !error) { 1037 vec.sv_handler = osap->sa_handler; 1038 SIG2OSIG(osap->sa_mask, vec.sv_mask); 1039 vec.sv_flags = osap->sa_flags; 1040 vec.sv_flags &= ~SA_NOCLDWAIT; 1041 vec.sv_flags ^= SA_RESTART;
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1051#ifdef COMPAT_SUNOS 1052 vec.sv_flags &= ~SA_NOCLDSTOP; 1053#endif
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1054 error = copyout(&vec, uap->osv, sizeof(vec)); 1055 } 1056 return (error); 1057} 1058 1059#ifndef _SYS_SYSPROTO_H_ 1060struct osigblock_args { 1061 int mask; 1062}; 1063#endif 1064/* 1065 * MPSAFE 1066 */ 1067int 1068osigblock(td, uap) 1069 register struct thread *td; 1070 struct osigblock_args *uap; 1071{ 1072 struct proc *p = td->td_proc; 1073 sigset_t set; 1074 1075 OSIG2SIG(uap->mask, set); 1076 SIG_CANTMASK(set); 1077 PROC_LOCK(p); 1078 SIG2OSIG(td->td_sigmask, td->td_retval[0]); 1079 SIGSETOR(td->td_sigmask, set); 1080 PROC_UNLOCK(p); 1081 return (0); 1082} 1083 1084#ifndef _SYS_SYSPROTO_H_ 1085struct osigsetmask_args { 1086 int mask; 1087}; 1088#endif 1089/* 1090 * MPSAFE 1091 */ 1092int 1093osigsetmask(td, uap) 1094 struct thread *td; 1095 struct osigsetmask_args *uap; 1096{ 1097 struct proc *p = td->td_proc; 1098 sigset_t set; 1099 1100 OSIG2SIG(uap->mask, set); 1101 SIG_CANTMASK(set); 1102 PROC_LOCK(p); 1103 SIG2OSIG(td->td_sigmask, td->td_retval[0]); 1104 SIGSETLO(td->td_sigmask, set); 1105 signotify(td); 1106 PROC_UNLOCK(p); 1107 return (0); 1108}
| 1042 error = copyout(&vec, uap->osv, sizeof(vec)); 1043 } 1044 return (error); 1045} 1046 1047#ifndef _SYS_SYSPROTO_H_ 1048struct osigblock_args { 1049 int mask; 1050}; 1051#endif 1052/* 1053 * MPSAFE 1054 */ 1055int 1056osigblock(td, uap) 1057 register struct thread *td; 1058 struct osigblock_args *uap; 1059{ 1060 struct proc *p = td->td_proc; 1061 sigset_t set; 1062 1063 OSIG2SIG(uap->mask, set); 1064 SIG_CANTMASK(set); 1065 PROC_LOCK(p); 1066 SIG2OSIG(td->td_sigmask, td->td_retval[0]); 1067 SIGSETOR(td->td_sigmask, set); 1068 PROC_UNLOCK(p); 1069 return (0); 1070} 1071 1072#ifndef _SYS_SYSPROTO_H_ 1073struct osigsetmask_args { 1074 int mask; 1075}; 1076#endif 1077/* 1078 * MPSAFE 1079 */ 1080int 1081osigsetmask(td, uap) 1082 struct thread *td; 1083 struct osigsetmask_args *uap; 1084{ 1085 struct proc *p = td->td_proc; 1086 sigset_t set; 1087 1088 OSIG2SIG(uap->mask, set); 1089 SIG_CANTMASK(set); 1090 PROC_LOCK(p); 1091 SIG2OSIG(td->td_sigmask, td->td_retval[0]); 1092 SIGSETLO(td->td_sigmask, set); 1093 signotify(td); 1094 PROC_UNLOCK(p); 1095 return (0); 1096}
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1109#endif /* COMPAT_43 || COMPAT_SUNOS */
| 1097#endif /* COMPAT_43 */
|
1110 1111/* 1112 * Suspend process until signal, providing mask to be set 1113 * in the meantime. 1114 ***** XXXKSE this doesn't make sense under KSE. 1115 ***** Do we suspend the thread or all threads in the process? 1116 ***** How do we suspend threads running NOW on another processor? 1117 */ 1118#ifndef _SYS_SYSPROTO_H_ 1119struct sigsuspend_args { 1120 const sigset_t *sigmask; 1121}; 1122#endif 1123/* 1124 * MPSAFE 1125 */ 1126/* ARGSUSED */ 1127int 1128sigsuspend(td, uap) 1129 struct thread *td; 1130 struct sigsuspend_args *uap; 1131{ 1132 sigset_t mask; 1133 int error; 1134 1135 error = copyin(uap->sigmask, &mask, sizeof(mask)); 1136 if (error) 1137 return (error); 1138 return (kern_sigsuspend(td, mask)); 1139} 1140 1141int 1142kern_sigsuspend(struct thread *td, sigset_t mask) 1143{ 1144 struct proc *p = td->td_proc; 1145 1146 /* 1147 * When returning from sigsuspend, we want 1148 * the old mask to be restored after the 1149 * signal handler has finished. Thus, we 1150 * save it here and mark the sigacts structure 1151 * to indicate this. 1152 */ 1153 PROC_LOCK(p); 1154 td->td_oldsigmask = td->td_sigmask; 1155 td->td_pflags |= TDP_OLDMASK; 1156 SIG_CANTMASK(mask); 1157 td->td_sigmask = mask; 1158 signotify(td); 1159 while (msleep(&p->p_sigacts, &p->p_mtx, PPAUSE|PCATCH, "pause", 0) == 0) 1160 /* void */; 1161 PROC_UNLOCK(p); 1162 /* always return EINTR rather than ERESTART... */ 1163 return (EINTR); 1164} 1165 1166#ifdef COMPAT_43 /* XXX - COMPAT_FBSD3 */ 1167/* 1168 * Compatibility sigsuspend call for old binaries. Note nonstandard calling 1169 * convention: libc stub passes mask, not pointer, to save a copyin. 1170 */ 1171#ifndef _SYS_SYSPROTO_H_ 1172struct osigsuspend_args { 1173 osigset_t mask; 1174}; 1175#endif 1176/* 1177 * MPSAFE 1178 */ 1179/* ARGSUSED */ 1180int 1181osigsuspend(td, uap) 1182 struct thread *td; 1183 struct osigsuspend_args *uap; 1184{ 1185 struct proc *p = td->td_proc; 1186 sigset_t mask; 1187 1188 PROC_LOCK(p); 1189 td->td_oldsigmask = td->td_sigmask; 1190 td->td_pflags |= TDP_OLDMASK; 1191 OSIG2SIG(uap->mask, mask); 1192 SIG_CANTMASK(mask); 1193 SIGSETLO(td->td_sigmask, mask); 1194 signotify(td); 1195 while (msleep(&p->p_sigacts, &p->p_mtx, PPAUSE|PCATCH, "opause", 0) == 0) 1196 /* void */; 1197 PROC_UNLOCK(p); 1198 /* always return EINTR rather than ERESTART... */ 1199 return (EINTR); 1200} 1201#endif /* COMPAT_43 */ 1202
| 1098 1099/* 1100 * Suspend process until signal, providing mask to be set 1101 * in the meantime. 1102 ***** XXXKSE this doesn't make sense under KSE. 1103 ***** Do we suspend the thread or all threads in the process? 1104 ***** How do we suspend threads running NOW on another processor? 1105 */ 1106#ifndef _SYS_SYSPROTO_H_ 1107struct sigsuspend_args { 1108 const sigset_t *sigmask; 1109}; 1110#endif 1111/* 1112 * MPSAFE 1113 */ 1114/* ARGSUSED */ 1115int 1116sigsuspend(td, uap) 1117 struct thread *td; 1118 struct sigsuspend_args *uap; 1119{ 1120 sigset_t mask; 1121 int error; 1122 1123 error = copyin(uap->sigmask, &mask, sizeof(mask)); 1124 if (error) 1125 return (error); 1126 return (kern_sigsuspend(td, mask)); 1127} 1128 1129int 1130kern_sigsuspend(struct thread *td, sigset_t mask) 1131{ 1132 struct proc *p = td->td_proc; 1133 1134 /* 1135 * When returning from sigsuspend, we want 1136 * the old mask to be restored after the 1137 * signal handler has finished. Thus, we 1138 * save it here and mark the sigacts structure 1139 * to indicate this. 1140 */ 1141 PROC_LOCK(p); 1142 td->td_oldsigmask = td->td_sigmask; 1143 td->td_pflags |= TDP_OLDMASK; 1144 SIG_CANTMASK(mask); 1145 td->td_sigmask = mask; 1146 signotify(td); 1147 while (msleep(&p->p_sigacts, &p->p_mtx, PPAUSE|PCATCH, "pause", 0) == 0) 1148 /* void */; 1149 PROC_UNLOCK(p); 1150 /* always return EINTR rather than ERESTART... */ 1151 return (EINTR); 1152} 1153 1154#ifdef COMPAT_43 /* XXX - COMPAT_FBSD3 */ 1155/* 1156 * Compatibility sigsuspend call for old binaries. Note nonstandard calling 1157 * convention: libc stub passes mask, not pointer, to save a copyin. 1158 */ 1159#ifndef _SYS_SYSPROTO_H_ 1160struct osigsuspend_args { 1161 osigset_t mask; 1162}; 1163#endif 1164/* 1165 * MPSAFE 1166 */ 1167/* ARGSUSED */ 1168int 1169osigsuspend(td, uap) 1170 struct thread *td; 1171 struct osigsuspend_args *uap; 1172{ 1173 struct proc *p = td->td_proc; 1174 sigset_t mask; 1175 1176 PROC_LOCK(p); 1177 td->td_oldsigmask = td->td_sigmask; 1178 td->td_pflags |= TDP_OLDMASK; 1179 OSIG2SIG(uap->mask, mask); 1180 SIG_CANTMASK(mask); 1181 SIGSETLO(td->td_sigmask, mask); 1182 signotify(td); 1183 while (msleep(&p->p_sigacts, &p->p_mtx, PPAUSE|PCATCH, "opause", 0) == 0) 1184 /* void */; 1185 PROC_UNLOCK(p); 1186 /* always return EINTR rather than ERESTART... */ 1187 return (EINTR); 1188} 1189#endif /* COMPAT_43 */ 1190
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1203#if defined(COMPAT_43) || defined(COMPAT_SUNOS)
| 1191#if defined(COMPAT_43)
|
1204#ifndef _SYS_SYSPROTO_H_ 1205struct osigstack_args { 1206 struct sigstack *nss; 1207 struct sigstack *oss; 1208}; 1209#endif 1210/* 1211 * MPSAFE 1212 */ 1213/* ARGSUSED */ 1214int 1215osigstack(td, uap) 1216 struct thread *td; 1217 register struct osigstack_args *uap; 1218{ 1219 struct sigstack nss, oss; 1220 int error = 0; 1221 1222 if (uap->nss != NULL) { 1223 error = copyin(uap->nss, &nss, sizeof(nss)); 1224 if (error) 1225 return (error); 1226 } 1227 oss.ss_sp = td->td_sigstk.ss_sp; 1228 oss.ss_onstack = sigonstack(cpu_getstack(td)); 1229 if (uap->nss != NULL) { 1230 td->td_sigstk.ss_sp = nss.ss_sp; 1231 td->td_sigstk.ss_size = 0; 1232 td->td_sigstk.ss_flags |= nss.ss_onstack & SS_ONSTACK; 1233 td->td_pflags |= TDP_ALTSTACK; 1234 } 1235 if (uap->oss != NULL) 1236 error = copyout(&oss, uap->oss, sizeof(oss)); 1237 1238 return (error); 1239}
| 1192#ifndef _SYS_SYSPROTO_H_ 1193struct osigstack_args { 1194 struct sigstack *nss; 1195 struct sigstack *oss; 1196}; 1197#endif 1198/* 1199 * MPSAFE 1200 */ 1201/* ARGSUSED */ 1202int 1203osigstack(td, uap) 1204 struct thread *td; 1205 register struct osigstack_args *uap; 1206{ 1207 struct sigstack nss, oss; 1208 int error = 0; 1209 1210 if (uap->nss != NULL) { 1211 error = copyin(uap->nss, &nss, sizeof(nss)); 1212 if (error) 1213 return (error); 1214 } 1215 oss.ss_sp = td->td_sigstk.ss_sp; 1216 oss.ss_onstack = sigonstack(cpu_getstack(td)); 1217 if (uap->nss != NULL) { 1218 td->td_sigstk.ss_sp = nss.ss_sp; 1219 td->td_sigstk.ss_size = 0; 1220 td->td_sigstk.ss_flags |= nss.ss_onstack & SS_ONSTACK; 1221 td->td_pflags |= TDP_ALTSTACK; 1222 } 1223 if (uap->oss != NULL) 1224 error = copyout(&oss, uap->oss, sizeof(oss)); 1225 1226 return (error); 1227}
|
1240#endif /* COMPAT_43 || COMPAT_SUNOS */
| 1228#endif /* COMPAT_43 */
|
1241 1242#ifndef _SYS_SYSPROTO_H_ 1243struct sigaltstack_args { 1244 stack_t *ss; 1245 stack_t *oss; 1246}; 1247#endif 1248/* 1249 * MPSAFE 1250 */ 1251/* ARGSUSED */ 1252int 1253sigaltstack(td, uap) 1254 struct thread *td; 1255 register struct sigaltstack_args *uap; 1256{ 1257 stack_t ss, oss; 1258 int error; 1259 1260 if (uap->ss != NULL) { 1261 error = copyin(uap->ss, &ss, sizeof(ss)); 1262 if (error) 1263 return (error); 1264 } 1265 error = kern_sigaltstack(td, (uap->ss != NULL) ? &ss : NULL, 1266 (uap->oss != NULL) ? &oss : NULL); 1267 if (error) 1268 return (error); 1269 if (uap->oss != NULL) 1270 error = copyout(&oss, uap->oss, sizeof(stack_t)); 1271 return (error); 1272} 1273 1274int 1275kern_sigaltstack(struct thread *td, stack_t *ss, stack_t *oss) 1276{ 1277 struct proc *p = td->td_proc; 1278 int oonstack; 1279 1280 oonstack = sigonstack(cpu_getstack(td)); 1281 1282 if (oss != NULL) { 1283 *oss = td->td_sigstk; 1284 oss->ss_flags = (td->td_pflags & TDP_ALTSTACK) 1285 ? ((oonstack) ? SS_ONSTACK : 0) : SS_DISABLE; 1286 } 1287 1288 if (ss != NULL) { 1289 if (oonstack) 1290 return (EPERM); 1291 if ((ss->ss_flags & ~SS_DISABLE) != 0) 1292 return (EINVAL); 1293 if (!(ss->ss_flags & SS_DISABLE)) { 1294 if (ss->ss_size < p->p_sysent->sv_minsigstksz) { 1295 return (ENOMEM); 1296 } 1297 td->td_sigstk = *ss; 1298 td->td_pflags |= TDP_ALTSTACK; 1299 } else { 1300 td->td_pflags &= ~TDP_ALTSTACK; 1301 } 1302 } 1303 return (0); 1304} 1305 1306/* 1307 * Common code for kill process group/broadcast kill. 1308 * cp is calling process. 1309 */ 1310static int 1311killpg1(td, sig, pgid, all) 1312 register struct thread *td; 1313 int sig, pgid, all; 1314{ 1315 register struct proc *p; 1316 struct pgrp *pgrp; 1317 int nfound = 0; 1318 1319 if (all) { 1320 /* 1321 * broadcast 1322 */ 1323 sx_slock(&allproc_lock); 1324 LIST_FOREACH(p, &allproc, p_list) { 1325 PROC_LOCK(p); 1326 if (p->p_pid <= 1 || p->p_flag & P_SYSTEM || 1327 p == td->td_proc) { 1328 PROC_UNLOCK(p); 1329 continue; 1330 } 1331 if (p_cansignal(td, p, sig) == 0) { 1332 nfound++; 1333 if (sig) 1334 psignal(p, sig); 1335 } 1336 PROC_UNLOCK(p); 1337 } 1338 sx_sunlock(&allproc_lock); 1339 } else { 1340 sx_slock(&proctree_lock); 1341 if (pgid == 0) { 1342 /* 1343 * zero pgid means send to my process group. 1344 */ 1345 pgrp = td->td_proc->p_pgrp; 1346 PGRP_LOCK(pgrp); 1347 } else { 1348 pgrp = pgfind(pgid); 1349 if (pgrp == NULL) { 1350 sx_sunlock(&proctree_lock); 1351 return (ESRCH); 1352 } 1353 } 1354 sx_sunlock(&proctree_lock); 1355 LIST_FOREACH(p, &pgrp->pg_members, p_pglist) { 1356 PROC_LOCK(p); 1357 if (p->p_pid <= 1 || p->p_flag & P_SYSTEM) { 1358 PROC_UNLOCK(p); 1359 continue; 1360 } 1361 if (p->p_state == PRS_ZOMBIE) { 1362 PROC_UNLOCK(p); 1363 continue; 1364 } 1365 if (p_cansignal(td, p, sig) == 0) { 1366 nfound++; 1367 if (sig) 1368 psignal(p, sig); 1369 } 1370 PROC_UNLOCK(p); 1371 } 1372 PGRP_UNLOCK(pgrp); 1373 } 1374 return (nfound ? 0 : ESRCH); 1375} 1376 1377#ifndef _SYS_SYSPROTO_H_ 1378struct kill_args { 1379 int pid; 1380 int signum; 1381}; 1382#endif 1383/* 1384 * MPSAFE 1385 */ 1386/* ARGSUSED */ 1387int 1388kill(td, uap) 1389 register struct thread *td; 1390 register struct kill_args *uap; 1391{ 1392 register struct proc *p; 1393 int error; 1394 1395 if ((u_int)uap->signum > _SIG_MAXSIG) 1396 return (EINVAL); 1397 1398 if (uap->pid > 0) { 1399 /* kill single process */ 1400 if ((p = pfind(uap->pid)) == NULL) 1401 return (ESRCH); 1402 error = p_cansignal(td, p, uap->signum); 1403 if (error == 0 && uap->signum) 1404 psignal(p, uap->signum); 1405 PROC_UNLOCK(p); 1406 return (error); 1407 } 1408 switch (uap->pid) { 1409 case -1: /* broadcast signal */ 1410 return (killpg1(td, uap->signum, 0, 1)); 1411 case 0: /* signal own process group */ 1412 return (killpg1(td, uap->signum, 0, 0)); 1413 default: /* negative explicit process group */ 1414 return (killpg1(td, uap->signum, -uap->pid, 0)); 1415 } 1416 /* NOTREACHED */ 1417} 1418
| 1229 1230#ifndef _SYS_SYSPROTO_H_ 1231struct sigaltstack_args { 1232 stack_t *ss; 1233 stack_t *oss; 1234}; 1235#endif 1236/* 1237 * MPSAFE 1238 */ 1239/* ARGSUSED */ 1240int 1241sigaltstack(td, uap) 1242 struct thread *td; 1243 register struct sigaltstack_args *uap; 1244{ 1245 stack_t ss, oss; 1246 int error; 1247 1248 if (uap->ss != NULL) { 1249 error = copyin(uap->ss, &ss, sizeof(ss)); 1250 if (error) 1251 return (error); 1252 } 1253 error = kern_sigaltstack(td, (uap->ss != NULL) ? &ss : NULL, 1254 (uap->oss != NULL) ? &oss : NULL); 1255 if (error) 1256 return (error); 1257 if (uap->oss != NULL) 1258 error = copyout(&oss, uap->oss, sizeof(stack_t)); 1259 return (error); 1260} 1261 1262int 1263kern_sigaltstack(struct thread *td, stack_t *ss, stack_t *oss) 1264{ 1265 struct proc *p = td->td_proc; 1266 int oonstack; 1267 1268 oonstack = sigonstack(cpu_getstack(td)); 1269 1270 if (oss != NULL) { 1271 *oss = td->td_sigstk; 1272 oss->ss_flags = (td->td_pflags & TDP_ALTSTACK) 1273 ? ((oonstack) ? SS_ONSTACK : 0) : SS_DISABLE; 1274 } 1275 1276 if (ss != NULL) { 1277 if (oonstack) 1278 return (EPERM); 1279 if ((ss->ss_flags & ~SS_DISABLE) != 0) 1280 return (EINVAL); 1281 if (!(ss->ss_flags & SS_DISABLE)) { 1282 if (ss->ss_size < p->p_sysent->sv_minsigstksz) { 1283 return (ENOMEM); 1284 } 1285 td->td_sigstk = *ss; 1286 td->td_pflags |= TDP_ALTSTACK; 1287 } else { 1288 td->td_pflags &= ~TDP_ALTSTACK; 1289 } 1290 } 1291 return (0); 1292} 1293 1294/* 1295 * Common code for kill process group/broadcast kill. 1296 * cp is calling process. 1297 */ 1298static int 1299killpg1(td, sig, pgid, all) 1300 register struct thread *td; 1301 int sig, pgid, all; 1302{ 1303 register struct proc *p; 1304 struct pgrp *pgrp; 1305 int nfound = 0; 1306 1307 if (all) { 1308 /* 1309 * broadcast 1310 */ 1311 sx_slock(&allproc_lock); 1312 LIST_FOREACH(p, &allproc, p_list) { 1313 PROC_LOCK(p); 1314 if (p->p_pid <= 1 || p->p_flag & P_SYSTEM || 1315 p == td->td_proc) { 1316 PROC_UNLOCK(p); 1317 continue; 1318 } 1319 if (p_cansignal(td, p, sig) == 0) { 1320 nfound++; 1321 if (sig) 1322 psignal(p, sig); 1323 } 1324 PROC_UNLOCK(p); 1325 } 1326 sx_sunlock(&allproc_lock); 1327 } else { 1328 sx_slock(&proctree_lock); 1329 if (pgid == 0) { 1330 /* 1331 * zero pgid means send to my process group. 1332 */ 1333 pgrp = td->td_proc->p_pgrp; 1334 PGRP_LOCK(pgrp); 1335 } else { 1336 pgrp = pgfind(pgid); 1337 if (pgrp == NULL) { 1338 sx_sunlock(&proctree_lock); 1339 return (ESRCH); 1340 } 1341 } 1342 sx_sunlock(&proctree_lock); 1343 LIST_FOREACH(p, &pgrp->pg_members, p_pglist) { 1344 PROC_LOCK(p); 1345 if (p->p_pid <= 1 || p->p_flag & P_SYSTEM) { 1346 PROC_UNLOCK(p); 1347 continue; 1348 } 1349 if (p->p_state == PRS_ZOMBIE) { 1350 PROC_UNLOCK(p); 1351 continue; 1352 } 1353 if (p_cansignal(td, p, sig) == 0) { 1354 nfound++; 1355 if (sig) 1356 psignal(p, sig); 1357 } 1358 PROC_UNLOCK(p); 1359 } 1360 PGRP_UNLOCK(pgrp); 1361 } 1362 return (nfound ? 0 : ESRCH); 1363} 1364 1365#ifndef _SYS_SYSPROTO_H_ 1366struct kill_args { 1367 int pid; 1368 int signum; 1369}; 1370#endif 1371/* 1372 * MPSAFE 1373 */ 1374/* ARGSUSED */ 1375int 1376kill(td, uap) 1377 register struct thread *td; 1378 register struct kill_args *uap; 1379{ 1380 register struct proc *p; 1381 int error; 1382 1383 if ((u_int)uap->signum > _SIG_MAXSIG) 1384 return (EINVAL); 1385 1386 if (uap->pid > 0) { 1387 /* kill single process */ 1388 if ((p = pfind(uap->pid)) == NULL) 1389 return (ESRCH); 1390 error = p_cansignal(td, p, uap->signum); 1391 if (error == 0 && uap->signum) 1392 psignal(p, uap->signum); 1393 PROC_UNLOCK(p); 1394 return (error); 1395 } 1396 switch (uap->pid) { 1397 case -1: /* broadcast signal */ 1398 return (killpg1(td, uap->signum, 0, 1)); 1399 case 0: /* signal own process group */ 1400 return (killpg1(td, uap->signum, 0, 0)); 1401 default: /* negative explicit process group */ 1402 return (killpg1(td, uap->signum, -uap->pid, 0)); 1403 } 1404 /* NOTREACHED */ 1405} 1406
|
1419#if defined(COMPAT_43) || defined(COMPAT_SUNOS)
| 1407#if defined(COMPAT_43)
|
1420#ifndef _SYS_SYSPROTO_H_ 1421struct okillpg_args { 1422 int pgid; 1423 int signum; 1424}; 1425#endif 1426/* 1427 * MPSAFE 1428 */ 1429/* ARGSUSED */ 1430int 1431okillpg(td, uap) 1432 struct thread *td; 1433 register struct okillpg_args *uap; 1434{ 1435 1436 if ((u_int)uap->signum > _SIG_MAXSIG) 1437 return (EINVAL); 1438 return (killpg1(td, uap->signum, uap->pgid, 0)); 1439}
| 1408#ifndef _SYS_SYSPROTO_H_ 1409struct okillpg_args { 1410 int pgid; 1411 int signum; 1412}; 1413#endif 1414/* 1415 * MPSAFE 1416 */ 1417/* ARGSUSED */ 1418int 1419okillpg(td, uap) 1420 struct thread *td; 1421 register struct okillpg_args *uap; 1422{ 1423 1424 if ((u_int)uap->signum > _SIG_MAXSIG) 1425 return (EINVAL); 1426 return (killpg1(td, uap->signum, uap->pgid, 0)); 1427}
|
1440#endif /* COMPAT_43 || COMPAT_SUNOS */
| 1428#endif /* COMPAT_43 */
|
1441 1442/* 1443 * Send a signal to a process group. 1444 */ 1445void 1446gsignal(pgid, sig) 1447 int pgid, sig; 1448{ 1449 struct pgrp *pgrp; 1450 1451 if (pgid != 0) { 1452 sx_slock(&proctree_lock); 1453 pgrp = pgfind(pgid); 1454 sx_sunlock(&proctree_lock); 1455 if (pgrp != NULL) { 1456 pgsignal(pgrp, sig, 0); 1457 PGRP_UNLOCK(pgrp); 1458 } 1459 } 1460} 1461 1462/* 1463 * Send a signal to a process group. If checktty is 1, 1464 * limit to members which have a controlling terminal. 1465 */ 1466void 1467pgsignal(pgrp, sig, checkctty) 1468 struct pgrp *pgrp; 1469 int sig, checkctty; 1470{ 1471 register struct proc *p; 1472 1473 if (pgrp) { 1474 PGRP_LOCK_ASSERT(pgrp, MA_OWNED); 1475 LIST_FOREACH(p, &pgrp->pg_members, p_pglist) { 1476 PROC_LOCK(p); 1477 if (checkctty == 0 || p->p_flag & P_CONTROLT) 1478 psignal(p, sig); 1479 PROC_UNLOCK(p); 1480 } 1481 } 1482} 1483 1484/* 1485 * Send a signal caused by a trap to the current thread. 1486 * If it will be caught immediately, deliver it with correct code. 1487 * Otherwise, post it normally. 1488 * 1489 * MPSAFE 1490 */ 1491void 1492trapsignal(struct thread *td, int sig, u_long code) 1493{ 1494 struct sigacts *ps; 1495 struct proc *p; 1496 siginfo_t siginfo; 1497 int error; 1498 1499 p = td->td_proc; 1500 if (td->td_pflags & TDP_SA) { 1501 if (td->td_mailbox == NULL) 1502 thread_user_enter(p, td); 1503 PROC_LOCK(p); 1504 if (td->td_mailbox) { 1505 SIGDELSET(td->td_sigmask, sig); 1506 mtx_lock_spin(&sched_lock); 1507 /* 1508 * Force scheduling an upcall, so UTS has chance to 1509 * process the signal before thread runs again in 1510 * userland. 1511 */ 1512 if (td->td_upcall) 1513 td->td_upcall->ku_flags |= KUF_DOUPCALL; 1514 mtx_unlock_spin(&sched_lock); 1515 } else { 1516 /* UTS caused a sync signal */ 1517 p->p_code = code; /* XXX for core dump/debugger */ 1518 p->p_sig = sig; /* XXX to verify code */ 1519 sigexit(td, sig); 1520 } 1521 } else { 1522 PROC_LOCK(p); 1523 } 1524 ps = p->p_sigacts; 1525 mtx_lock(&ps->ps_mtx); 1526 if ((p->p_flag & P_TRACED) == 0 && SIGISMEMBER(ps->ps_sigcatch, sig) && 1527 !SIGISMEMBER(td->td_sigmask, sig)) { 1528 p->p_stats->p_ru.ru_nsignals++; 1529#ifdef KTRACE 1530 if (KTRPOINT(curthread, KTR_PSIG)) 1531 ktrpsig(sig, ps->ps_sigact[_SIG_IDX(sig)], 1532 &td->td_sigmask, code); 1533#endif 1534 if (!(td->td_pflags & TDP_SA)) 1535 (*p->p_sysent->sv_sendsig)( 1536 ps->ps_sigact[_SIG_IDX(sig)], sig, 1537 &td->td_sigmask, code); 1538 else { 1539 cpu_thread_siginfo(sig, code, &siginfo); 1540 mtx_unlock(&ps->ps_mtx); 1541 PROC_UNLOCK(p); 1542 error = copyout(&siginfo, &td->td_mailbox->tm_syncsig, 1543 sizeof(siginfo)); 1544 PROC_LOCK(p); 1545 /* UTS memory corrupted */ 1546 if (error) 1547 sigexit(td, SIGILL); 1548 SIGADDSET(td->td_sigmask, sig); 1549 mtx_lock(&ps->ps_mtx); 1550 } 1551 SIGSETOR(td->td_sigmask, ps->ps_catchmask[_SIG_IDX(sig)]); 1552 if (!SIGISMEMBER(ps->ps_signodefer, sig)) 1553 SIGADDSET(td->td_sigmask, sig); 1554 if (SIGISMEMBER(ps->ps_sigreset, sig)) { 1555 /* 1556 * See kern_sigaction() for origin of this code. 1557 */ 1558 SIGDELSET(ps->ps_sigcatch, sig); 1559 if (sig != SIGCONT && 1560 sigprop(sig) & SA_IGNORE) 1561 SIGADDSET(ps->ps_sigignore, sig); 1562 ps->ps_sigact[_SIG_IDX(sig)] = SIG_DFL; 1563 } 1564 mtx_unlock(&ps->ps_mtx); 1565 } else { 1566 mtx_unlock(&ps->ps_mtx); 1567 p->p_code = code; /* XXX for core dump/debugger */ 1568 p->p_sig = sig; /* XXX to verify code */ 1569 tdsignal(td, sig, SIGTARGET_TD); 1570 } 1571 PROC_UNLOCK(p); 1572} 1573 1574static struct thread * 1575sigtd(struct proc *p, int sig, int prop) 1576{ 1577 struct thread *td, *signal_td; 1578 1579 PROC_LOCK_ASSERT(p, MA_OWNED); 1580 1581 /* 1582 * First find a thread in sigwait state and signal belongs to 1583 * its wait set. POSIX's arguments is that speed of delivering signal 1584 * to sigwait thread is faster than delivering signal to user stack. 1585 * If we can not find sigwait thread, then find the first thread in 1586 * the proc that doesn't have this signal masked, an exception is 1587 * if current thread is sending signal to its process, and it does not 1588 * mask the signal, it should get the signal, this is another fast 1589 * way to deliver signal. 1590 */ 1591 signal_td = NULL; 1592 mtx_lock_spin(&sched_lock); 1593 FOREACH_THREAD_IN_PROC(p, td) { 1594 if (td->td_waitset != NULL && 1595 SIGISMEMBER(*(td->td_waitset), sig)) { 1596 mtx_unlock_spin(&sched_lock); 1597 return (td); 1598 } 1599 if (!SIGISMEMBER(td->td_sigmask, sig)) { 1600 if (td == curthread) 1601 signal_td = curthread; 1602 else if (signal_td == NULL) 1603 signal_td = td; 1604 } 1605 } 1606 if (signal_td == NULL) 1607 signal_td = FIRST_THREAD_IN_PROC(p); 1608 mtx_unlock_spin(&sched_lock); 1609 return (signal_td); 1610} 1611 1612/* 1613 * Send the signal to the process. If the signal has an action, the action 1614 * is usually performed by the target process rather than the caller; we add 1615 * the signal to the set of pending signals for the process. 1616 * 1617 * Exceptions: 1618 * o When a stop signal is sent to a sleeping process that takes the 1619 * default action, the process is stopped without awakening it. 1620 * o SIGCONT restarts stopped processes (or puts them back to sleep) 1621 * regardless of the signal action (eg, blocked or ignored). 1622 * 1623 * Other ignored signals are discarded immediately. 1624 * 1625 * MPSAFE 1626 */ 1627void 1628psignal(struct proc *p, int sig) 1629{ 1630 struct thread *td; 1631 int prop; 1632 1633 if (!_SIG_VALID(sig)) 1634 panic("psignal(): invalid signal"); 1635 1636 PROC_LOCK_ASSERT(p, MA_OWNED); 1637 prop = sigprop(sig); 1638 1639 /* 1640 * Find a thread to deliver the signal to. 1641 */ 1642 td = sigtd(p, sig, prop); 1643 1644 tdsignal(td, sig, SIGTARGET_P); 1645} 1646 1647/* 1648 * MPSAFE 1649 */ 1650void 1651tdsignal(struct thread *td, int sig, sigtarget_t target) 1652{ 1653 sigset_t saved; 1654 struct proc *p = td->td_proc; 1655 1656 if (p->p_flag & P_SA) 1657 saved = p->p_siglist; 1658 do_tdsignal(td, sig, target); 1659 if ((p->p_flag & P_SA) && !(p->p_flag & P_SIGEVENT)) { 1660 if (SIGSETEQ(saved, p->p_siglist)) 1661 return; 1662 else { 1663 /* pending set changed */ 1664 p->p_flag |= P_SIGEVENT; 1665 wakeup(&p->p_siglist); 1666 } 1667 } 1668} 1669 1670static void 1671do_tdsignal(struct thread *td, int sig, sigtarget_t target) 1672{ 1673 struct proc *p; 1674 register sig_t action; 1675 sigset_t *siglist; 1676 struct thread *td0; 1677 register int prop; 1678 struct sigacts *ps; 1679 1680 if (!_SIG_VALID(sig)) 1681 panic("do_tdsignal(): invalid signal"); 1682 1683 p = td->td_proc; 1684 ps = p->p_sigacts; 1685 1686 PROC_LOCK_ASSERT(p, MA_OWNED); 1687 KNOTE(&p->p_klist, NOTE_SIGNAL | sig); 1688 1689 prop = sigprop(sig); 1690 1691 /* 1692 * If the signal is blocked and not destined for this thread, then 1693 * assign it to the process so that we can find it later in the first 1694 * thread that unblocks it. Otherwise, assign it to this thread now. 1695 */ 1696 if (target == SIGTARGET_TD) { 1697 siglist = &td->td_siglist; 1698 } else { 1699 if (!SIGISMEMBER(td->td_sigmask, sig)) 1700 siglist = &td->td_siglist; 1701 else if (td->td_waitset != NULL && 1702 SIGISMEMBER(*(td->td_waitset), sig)) 1703 siglist = &td->td_siglist; 1704 else 1705 siglist = &p->p_siglist; 1706 } 1707 1708 /* 1709 * If proc is traced, always give parent a chance; 1710 * if signal event is tracked by procfs, give *that* 1711 * a chance, as well. 1712 */ 1713 if ((p->p_flag & P_TRACED) || (p->p_stops & S_SIG)) { 1714 action = SIG_DFL; 1715 } else { 1716 /* 1717 * If the signal is being ignored, 1718 * then we forget about it immediately. 1719 * (Note: we don't set SIGCONT in ps_sigignore, 1720 * and if it is set to SIG_IGN, 1721 * action will be SIG_DFL here.) 1722 */ 1723 mtx_lock(&ps->ps_mtx); 1724 if (SIGISMEMBER(ps->ps_sigignore, sig) || 1725 (p->p_flag & P_WEXIT)) { 1726 mtx_unlock(&ps->ps_mtx); 1727 return; 1728 } 1729 if (((td->td_waitset == NULL) && 1730 SIGISMEMBER(td->td_sigmask, sig)) || 1731 ((td->td_waitset != NULL) && 1732 SIGISMEMBER(td->td_sigmask, sig) && 1733 !SIGISMEMBER(*(td->td_waitset), sig))) 1734 action = SIG_HOLD; 1735 else if (SIGISMEMBER(ps->ps_sigcatch, sig)) 1736 action = SIG_CATCH; 1737 else 1738 action = SIG_DFL; 1739 mtx_unlock(&ps->ps_mtx); 1740 } 1741 1742 if (prop & SA_CONT) { 1743 SIG_STOPSIGMASK(p->p_siglist); 1744 /* 1745 * XXX Should investigate leaving STOP and CONT sigs only in 1746 * the proc's siglist. 1747 */ 1748 mtx_lock_spin(&sched_lock); 1749 FOREACH_THREAD_IN_PROC(p, td0) 1750 SIG_STOPSIGMASK(td0->td_siglist); 1751 mtx_unlock_spin(&sched_lock); 1752 } 1753 1754 if (prop & SA_STOP) { 1755 /* 1756 * If sending a tty stop signal to a member of an orphaned 1757 * process group, discard the signal here if the action 1758 * is default; don't stop the process below if sleeping, 1759 * and don't clear any pending SIGCONT. 1760 */ 1761 if ((prop & SA_TTYSTOP) && 1762 (p->p_pgrp->pg_jobc == 0) && 1763 (action == SIG_DFL)) 1764 return; 1765 SIG_CONTSIGMASK(p->p_siglist); 1766 mtx_lock_spin(&sched_lock); 1767 FOREACH_THREAD_IN_PROC(p, td0) 1768 SIG_CONTSIGMASK(td0->td_siglist); 1769 mtx_unlock_spin(&sched_lock); 1770 p->p_flag &= ~P_CONTINUED; 1771 } 1772 1773 SIGADDSET(*siglist, sig); 1774 signotify(td); /* uses schedlock */ 1775 if (siglist == &td->td_siglist && (td->td_waitset != NULL) && 1776 action != SIG_HOLD) { 1777 td->td_waitset = NULL; 1778 } 1779 1780 /* 1781 * Defer further processing for signals which are held, 1782 * except that stopped processes must be continued by SIGCONT. 1783 */ 1784 if (action == SIG_HOLD && 1785 !((prop & SA_CONT) && (p->p_flag & P_STOPPED_SIG))) 1786 return; 1787 /* 1788 * Some signals have a process-wide effect and a per-thread 1789 * component. Most processing occurs when the process next 1790 * tries to cross the user boundary, however there are some 1791 * times when processing needs to be done immediatly, such as 1792 * waking up threads so that they can cross the user boundary. 1793 * We try do the per-process part here. 1794 */ 1795 if (P_SHOULDSTOP(p)) { 1796 /* 1797 * The process is in stopped mode. All the threads should be 1798 * either winding down or already on the suspended queue. 1799 */ 1800 if (p->p_flag & P_TRACED) { 1801 /* 1802 * The traced process is already stopped, 1803 * so no further action is necessary. 1804 * No signal can restart us. 1805 */ 1806 goto out; 1807 } 1808 1809 if (sig == SIGKILL) { 1810 /* 1811 * SIGKILL sets process running. 1812 * It will die elsewhere. 1813 * All threads must be restarted. 1814 */ 1815 p->p_flag &= ~P_STOPPED; 1816 goto runfast; 1817 } 1818 1819 if (prop & SA_CONT) { 1820 /* 1821 * If SIGCONT is default (or ignored), we continue the 1822 * process but don't leave the signal in siglist as 1823 * it has no further action. If SIGCONT is held, we 1824 * continue the process and leave the signal in 1825 * siglist. If the process catches SIGCONT, let it 1826 * handle the signal itself. If it isn't waiting on 1827 * an event, it goes back to run state. 1828 * Otherwise, process goes back to sleep state. 1829 */ 1830 p->p_flag &= ~P_STOPPED_SIG; 1831 p->p_flag |= P_CONTINUED; 1832 if (action == SIG_DFL) { 1833 SIGDELSET(*siglist, sig); 1834 } else if (action == SIG_CATCH) { 1835 /* 1836 * The process wants to catch it so it needs 1837 * to run at least one thread, but which one? 1838 * It would seem that the answer would be to 1839 * run an upcall in the next KSE to run, and 1840 * deliver the signal that way. In a NON KSE 1841 * process, we need to make sure that the 1842 * single thread is runnable asap. 1843 * XXXKSE for now however, make them all run. 1844 */ 1845 goto runfast; 1846 } 1847 /* 1848 * The signal is not ignored or caught. 1849 */ 1850 mtx_lock_spin(&sched_lock); 1851 thread_unsuspend(p); 1852 mtx_unlock_spin(&sched_lock); 1853 goto out; 1854 } 1855 1856 if (prop & SA_STOP) { 1857 /* 1858 * Already stopped, don't need to stop again 1859 * (If we did the shell could get confused). 1860 * Just make sure the signal STOP bit set. 1861 */ 1862 p->p_flag |= P_STOPPED_SIG; 1863 SIGDELSET(*siglist, sig); 1864 goto out; 1865 } 1866 1867 /* 1868 * All other kinds of signals: 1869 * If a thread is sleeping interruptibly, simulate a 1870 * wakeup so that when it is continued it will be made 1871 * runnable and can look at the signal. However, don't make 1872 * the PROCESS runnable, leave it stopped. 1873 * It may run a bit until it hits a thread_suspend_check(). 1874 */ 1875 mtx_lock_spin(&sched_lock); 1876 if (TD_ON_SLEEPQ(td) && (td->td_flags & TDF_SINTR)) 1877 sleepq_abort(td); 1878 mtx_unlock_spin(&sched_lock); 1879 goto out; 1880 /* 1881 * Mutexes are short lived. Threads waiting on them will 1882 * hit thread_suspend_check() soon. 1883 */ 1884 } else if (p->p_state == PRS_NORMAL) { 1885 if ((p->p_flag & P_TRACED) || (action != SIG_DFL) || 1886 !(prop & SA_STOP)) { 1887 mtx_lock_spin(&sched_lock); 1888 tdsigwakeup(td, sig, action); 1889 mtx_unlock_spin(&sched_lock); 1890 goto out; 1891 } 1892 if (prop & SA_STOP) { 1893 if (p->p_flag & P_PPWAIT) 1894 goto out; 1895 p->p_flag |= P_STOPPED_SIG; 1896 p->p_xstat = sig; 1897 mtx_lock_spin(&sched_lock); 1898 FOREACH_THREAD_IN_PROC(p, td0) { 1899 if (TD_IS_SLEEPING(td0) && 1900 (td0->td_flags & TDF_SINTR) && 1901 !TD_IS_SUSPENDED(td0)) { 1902 thread_suspend_one(td0); 1903 } else if (td != td0) { 1904 td0->td_flags |= TDF_ASTPENDING; 1905 } 1906 } 1907 thread_stopped(p); 1908 if (p->p_numthreads == p->p_suspcount) { 1909 SIGDELSET(p->p_siglist, p->p_xstat); 1910 FOREACH_THREAD_IN_PROC(p, td0) 1911 SIGDELSET(td0->td_siglist, p->p_xstat); 1912 } 1913 mtx_unlock_spin(&sched_lock); 1914 goto out; 1915 } 1916 else 1917 goto runfast; 1918 /* NOTREACHED */ 1919 } else { 1920 /* Not in "NORMAL" state. discard the signal. */ 1921 SIGDELSET(*siglist, sig); 1922 goto out; 1923 } 1924 1925 /* 1926 * The process is not stopped so we need to apply the signal to all the 1927 * running threads. 1928 */ 1929 1930runfast: 1931 mtx_lock_spin(&sched_lock); 1932 tdsigwakeup(td, sig, action); 1933 thread_unsuspend(p); 1934 mtx_unlock_spin(&sched_lock); 1935out: 1936 /* If we jump here, sched_lock should not be owned. */ 1937 mtx_assert(&sched_lock, MA_NOTOWNED); 1938} 1939 1940/* 1941 * The force of a signal has been directed against a single 1942 * thread. We need to see what we can do about knocking it 1943 * out of any sleep it may be in etc. 1944 */ 1945static void 1946tdsigwakeup(struct thread *td, int sig, sig_t action) 1947{ 1948 struct proc *p = td->td_proc; 1949 register int prop; 1950 1951 PROC_LOCK_ASSERT(p, MA_OWNED); 1952 mtx_assert(&sched_lock, MA_OWNED); 1953 prop = sigprop(sig); 1954 1955 /* 1956 * Bring the priority of a thread up if we want it to get 1957 * killed in this lifetime. 1958 */ 1959 if (action == SIG_DFL && (prop & SA_KILL)) { 1960 if (td->td_priority > PUSER) 1961 td->td_priority = PUSER; 1962 } 1963 1964 if (TD_ON_SLEEPQ(td)) { 1965 /* 1966 * If thread is sleeping uninterruptibly 1967 * we can't interrupt the sleep... the signal will 1968 * be noticed when the process returns through 1969 * trap() or syscall(). 1970 */ 1971 if ((td->td_flags & TDF_SINTR) == 0) 1972 return; 1973 /* 1974 * Process is sleeping and traced. Make it runnable 1975 * so it can discover the signal in issignal() and stop 1976 * for its parent. 1977 */ 1978 if (p->p_flag & P_TRACED) { 1979 p->p_flag &= ~P_STOPPED_TRACE; 1980 } else { 1981 /* 1982 * If SIGCONT is default (or ignored) and process is 1983 * asleep, we are finished; the process should not 1984 * be awakened. 1985 */ 1986 if ((prop & SA_CONT) && action == SIG_DFL) { 1987 SIGDELSET(p->p_siglist, sig); 1988 /* 1989 * It may be on either list in this state. 1990 * Remove from both for now. 1991 */ 1992 SIGDELSET(td->td_siglist, sig); 1993 return; 1994 } 1995 1996 /* 1997 * Give low priority threads a better chance to run. 1998 */ 1999 if (td->td_priority > PUSER) 2000 td->td_priority = PUSER; 2001 } 2002 sleepq_abort(td); 2003 } else { 2004 /* 2005 * Other states do nothing with the signal immediately, 2006 * other than kicking ourselves if we are running. 2007 * It will either never be noticed, or noticed very soon. 2008 */ 2009#ifdef SMP 2010 if (TD_IS_RUNNING(td) && td != curthread) 2011 forward_signal(td); 2012#endif 2013 } 2014} 2015 2016void 2017ptracestop(struct thread *td, int sig) 2018{ 2019 struct proc *p = td->td_proc; 2020 2021 PROC_LOCK_ASSERT(p, MA_OWNED); 2022 WITNESS_WARN(WARN_GIANTOK | WARN_SLEEPOK, 2023 &p->p_mtx.mtx_object, "Stopping for traced signal"); 2024 2025 p->p_xstat = sig; 2026 PROC_LOCK(p->p_pptr); 2027 psignal(p->p_pptr, SIGCHLD); 2028 PROC_UNLOCK(p->p_pptr); 2029 stop(p); 2030 mtx_lock_spin(&sched_lock); 2031 thread_suspend_one(td); 2032 PROC_UNLOCK(p); 2033 DROP_GIANT(); 2034 mi_switch(SW_INVOL); 2035 mtx_unlock_spin(&sched_lock); 2036 PICKUP_GIANT(); 2037} 2038 2039/* 2040 * If the current process has received a signal (should be caught or cause 2041 * termination, should interrupt current syscall), return the signal number. 2042 * Stop signals with default action are processed immediately, then cleared; 2043 * they aren't returned. This is checked after each entry to the system for 2044 * a syscall or trap (though this can usually be done without calling issignal 2045 * by checking the pending signal masks in cursig.) The normal call 2046 * sequence is 2047 * 2048 * while (sig = cursig(curthread)) 2049 * postsig(sig); 2050 */ 2051static int 2052issignal(td) 2053 struct thread *td; 2054{ 2055 struct proc *p; 2056 struct sigacts *ps; 2057 sigset_t sigpending; 2058 int sig, prop; 2059 struct thread *td0; 2060 2061 p = td->td_proc; 2062 ps = p->p_sigacts; 2063 mtx_assert(&ps->ps_mtx, MA_OWNED); 2064 PROC_LOCK_ASSERT(p, MA_OWNED); 2065 for (;;) { 2066 int traced = (p->p_flag & P_TRACED) || (p->p_stops & S_SIG); 2067 2068 sigpending = td->td_siglist; 2069 SIGSETNAND(sigpending, td->td_sigmask); 2070 2071 if (p->p_flag & P_PPWAIT) 2072 SIG_STOPSIGMASK(sigpending); 2073 if (SIGISEMPTY(sigpending)) /* no signal to send */ 2074 return (0); 2075 sig = sig_ffs(&sigpending); 2076 2077 if (p->p_stops & S_SIG) { 2078 mtx_unlock(&ps->ps_mtx); 2079 stopevent(p, S_SIG, sig); 2080 mtx_lock(&ps->ps_mtx); 2081 } 2082 2083 /* 2084 * We should see pending but ignored signals 2085 * only if P_TRACED was on when they were posted. 2086 */ 2087 if (SIGISMEMBER(ps->ps_sigignore, sig) && (traced == 0)) { 2088 SIGDELSET(td->td_siglist, sig); 2089 continue; 2090 } 2091 if (p->p_flag & P_TRACED && (p->p_flag & P_PPWAIT) == 0) { 2092 /* 2093 * If traced, always stop. 2094 */ 2095 mtx_unlock(&ps->ps_mtx); 2096 ptracestop(td, sig); 2097 PROC_LOCK(p); 2098 mtx_lock(&ps->ps_mtx); 2099 2100 /* 2101 * If parent wants us to take the signal, 2102 * then it will leave it in p->p_xstat; 2103 * otherwise we just look for signals again. 2104 */ 2105 SIGDELSET(td->td_siglist, sig); /* clear old signal */ 2106 sig = p->p_xstat; 2107 if (sig == 0) 2108 continue; 2109 2110 /* 2111 * If the traced bit got turned off, go back up 2112 * to the top to rescan signals. This ensures 2113 * that p_sig* and p_sigact are consistent. 2114 */ 2115 if ((p->p_flag & P_TRACED) == 0) 2116 continue; 2117 2118 /* 2119 * Put the new signal into td_siglist. If the 2120 * signal is being masked, look for other signals. 2121 */ 2122 SIGADDSET(td->td_siglist, sig); 2123 if (SIGISMEMBER(td->td_sigmask, sig)) 2124 continue; 2125 signotify(td); 2126 } 2127 2128 prop = sigprop(sig); 2129 2130 /* 2131 * Decide whether the signal should be returned. 2132 * Return the signal's number, or fall through 2133 * to clear it from the pending mask. 2134 */ 2135 switch ((intptr_t)p->p_sigacts->ps_sigact[_SIG_IDX(sig)]) { 2136 2137 case (intptr_t)SIG_DFL: 2138 /* 2139 * Don't take default actions on system processes. 2140 */ 2141 if (p->p_pid <= 1) { 2142#ifdef DIAGNOSTIC 2143 /* 2144 * Are you sure you want to ignore SIGSEGV 2145 * in init? XXX 2146 */ 2147 printf("Process (pid %lu) got signal %d\n", 2148 (u_long)p->p_pid, sig); 2149#endif 2150 break; /* == ignore */ 2151 } 2152 /* 2153 * If there is a pending stop signal to process 2154 * with default action, stop here, 2155 * then clear the signal. However, 2156 * if process is member of an orphaned 2157 * process group, ignore tty stop signals. 2158 */ 2159 if (prop & SA_STOP) { 2160 if (p->p_flag & P_TRACED || 2161 (p->p_pgrp->pg_jobc == 0 && 2162 prop & SA_TTYSTOP)) 2163 break; /* == ignore */ 2164 mtx_unlock(&ps->ps_mtx); 2165 WITNESS_WARN(WARN_GIANTOK | WARN_SLEEPOK, 2166 &p->p_mtx.mtx_object, "Catching SIGSTOP"); 2167 p->p_flag |= P_STOPPED_SIG; 2168 p->p_xstat = sig; 2169 mtx_lock_spin(&sched_lock); 2170 FOREACH_THREAD_IN_PROC(p, td0) { 2171 if (TD_IS_SLEEPING(td0) && 2172 (td0->td_flags & TDF_SINTR) && 2173 !TD_IS_SUSPENDED(td0)) { 2174 thread_suspend_one(td0); 2175 } else if (td != td0) { 2176 td0->td_flags |= TDF_ASTPENDING; 2177 } 2178 } 2179 thread_stopped(p); 2180 thread_suspend_one(td); 2181 PROC_UNLOCK(p); 2182 DROP_GIANT(); 2183 mi_switch(SW_INVOL); 2184 mtx_unlock_spin(&sched_lock); 2185 PICKUP_GIANT(); 2186 PROC_LOCK(p); 2187 mtx_lock(&ps->ps_mtx); 2188 break; 2189 } else if (prop & SA_IGNORE) { 2190 /* 2191 * Except for SIGCONT, shouldn't get here. 2192 * Default action is to ignore; drop it. 2193 */ 2194 break; /* == ignore */ 2195 } else 2196 return (sig); 2197 /*NOTREACHED*/ 2198 2199 case (intptr_t)SIG_IGN: 2200 /* 2201 * Masking above should prevent us ever trying 2202 * to take action on an ignored signal other 2203 * than SIGCONT, unless process is traced. 2204 */ 2205 if ((prop & SA_CONT) == 0 && 2206 (p->p_flag & P_TRACED) == 0) 2207 printf("issignal\n"); 2208 break; /* == ignore */ 2209 2210 default: 2211 /* 2212 * This signal has an action, let 2213 * postsig() process it. 2214 */ 2215 return (sig); 2216 } 2217 SIGDELSET(td->td_siglist, sig); /* take the signal! */ 2218 } 2219 /* NOTREACHED */ 2220} 2221 2222/* 2223 * Put the argument process into the stopped state and notify the parent 2224 * via wakeup. Signals are handled elsewhere. The process must not be 2225 * on the run queue. Must be called with the proc p locked. 2226 */ 2227static void 2228stop(struct proc *p) 2229{ 2230 2231 PROC_LOCK_ASSERT(p, MA_OWNED); 2232 p->p_flag |= P_STOPPED_SIG; 2233 p->p_flag &= ~P_WAITED; 2234 wakeup(p->p_pptr); 2235} 2236 2237/* 2238 * MPSAFE 2239 */ 2240void 2241thread_stopped(struct proc *p) 2242{ 2243 struct proc *p1 = curthread->td_proc; 2244 struct sigacts *ps; 2245 int n; 2246 2247 PROC_LOCK_ASSERT(p, MA_OWNED); 2248 mtx_assert(&sched_lock, MA_OWNED); 2249 n = p->p_suspcount; 2250 if (p == p1) 2251 n++; 2252 if ((p->p_flag & P_STOPPED_SIG) && (n == p->p_numthreads)) { 2253 mtx_unlock_spin(&sched_lock); 2254 stop(p); 2255 PROC_LOCK(p->p_pptr); 2256 ps = p->p_pptr->p_sigacts; 2257 mtx_lock(&ps->ps_mtx); 2258 if ((ps->ps_flag & PS_NOCLDSTOP) == 0) { 2259 mtx_unlock(&ps->ps_mtx); 2260 psignal(p->p_pptr, SIGCHLD); 2261 } else 2262 mtx_unlock(&ps->ps_mtx); 2263 PROC_UNLOCK(p->p_pptr); 2264 mtx_lock_spin(&sched_lock); 2265 } 2266} 2267 2268/* 2269 * Take the action for the specified signal 2270 * from the current set of pending signals. 2271 */ 2272void 2273postsig(sig) 2274 register int sig; 2275{ 2276 struct thread *td = curthread; 2277 register struct proc *p = td->td_proc; 2278 struct sigacts *ps; 2279 sig_t action; 2280 sigset_t returnmask; 2281 int code; 2282 2283 KASSERT(sig != 0, ("postsig")); 2284 2285 PROC_LOCK_ASSERT(p, MA_OWNED); 2286 ps = p->p_sigacts; 2287 mtx_assert(&ps->ps_mtx, MA_OWNED); 2288 SIGDELSET(td->td_siglist, sig); 2289 action = ps->ps_sigact[_SIG_IDX(sig)]; 2290#ifdef KTRACE 2291 if (KTRPOINT(td, KTR_PSIG)) 2292 ktrpsig(sig, action, td->td_pflags & TDP_OLDMASK ? 2293 &td->td_oldsigmask : &td->td_sigmask, 0); 2294#endif 2295 if (p->p_stops & S_SIG) { 2296 mtx_unlock(&ps->ps_mtx); 2297 stopevent(p, S_SIG, sig); 2298 mtx_lock(&ps->ps_mtx); 2299 } 2300 2301 if (!(td->td_pflags & TDP_SA && td->td_mailbox) && 2302 action == SIG_DFL) { 2303 /* 2304 * Default action, where the default is to kill 2305 * the process. (Other cases were ignored above.) 2306 */ 2307 mtx_unlock(&ps->ps_mtx); 2308 sigexit(td, sig); 2309 /* NOTREACHED */ 2310 } else { 2311 if (td->td_pflags & TDP_SA && td->td_mailbox) { 2312 if (sig == SIGKILL) { 2313 mtx_unlock(&ps->ps_mtx); 2314 sigexit(td, sig); 2315 } 2316 } 2317 2318 /* 2319 * If we get here, the signal must be caught. 2320 */ 2321 KASSERT(action != SIG_IGN && !SIGISMEMBER(td->td_sigmask, sig), 2322 ("postsig action")); 2323 /* 2324 * Set the new mask value and also defer further 2325 * occurrences of this signal. 2326 * 2327 * Special case: user has done a sigsuspend. Here the 2328 * current mask is not of interest, but rather the 2329 * mask from before the sigsuspend is what we want 2330 * restored after the signal processing is completed. 2331 */ 2332 if (td->td_pflags & TDP_OLDMASK) { 2333 returnmask = td->td_oldsigmask; 2334 td->td_pflags &= ~TDP_OLDMASK; 2335 } else 2336 returnmask = td->td_sigmask; 2337 2338 SIGSETOR(td->td_sigmask, ps->ps_catchmask[_SIG_IDX(sig)]); 2339 if (!SIGISMEMBER(ps->ps_signodefer, sig)) 2340 SIGADDSET(td->td_sigmask, sig); 2341 2342 if (SIGISMEMBER(ps->ps_sigreset, sig)) { 2343 /* 2344 * See kern_sigaction() for origin of this code. 2345 */ 2346 SIGDELSET(ps->ps_sigcatch, sig); 2347 if (sig != SIGCONT && 2348 sigprop(sig) & SA_IGNORE) 2349 SIGADDSET(ps->ps_sigignore, sig); 2350 ps->ps_sigact[_SIG_IDX(sig)] = SIG_DFL; 2351 } 2352 p->p_stats->p_ru.ru_nsignals++; 2353 if (p->p_sig != sig) { 2354 code = 0; 2355 } else { 2356 code = p->p_code; 2357 p->p_code = 0; 2358 p->p_sig = 0; 2359 } 2360 if (td->td_pflags & TDP_SA && td->td_mailbox) 2361 thread_signal_add(curthread, sig); 2362 else 2363 (*p->p_sysent->sv_sendsig)(action, sig, 2364 &returnmask, code); 2365 } 2366} 2367 2368/* 2369 * Kill the current process for stated reason. 2370 */ 2371void 2372killproc(p, why) 2373 struct proc *p; 2374 char *why; 2375{ 2376 2377 PROC_LOCK_ASSERT(p, MA_OWNED); 2378 CTR3(KTR_PROC, "killproc: proc %p (pid %d, %s)", 2379 p, p->p_pid, p->p_comm); 2380 log(LOG_ERR, "pid %d (%s), uid %d, was killed: %s\n", p->p_pid, p->p_comm, 2381 p->p_ucred ? p->p_ucred->cr_uid : -1, why); 2382 psignal(p, SIGKILL); 2383} 2384 2385/* 2386 * Force the current process to exit with the specified signal, dumping core 2387 * if appropriate. We bypass the normal tests for masked and caught signals, 2388 * allowing unrecoverable failures to terminate the process without changing 2389 * signal state. Mark the accounting record with the signal termination. 2390 * If dumping core, save the signal number for the debugger. Calls exit and 2391 * does not return. 2392 * 2393 * MPSAFE 2394 */ 2395void 2396sigexit(td, sig) 2397 struct thread *td; 2398 int sig; 2399{ 2400 struct proc *p = td->td_proc; 2401 2402 PROC_LOCK_ASSERT(p, MA_OWNED); 2403 p->p_acflag |= AXSIG; 2404 if (sigprop(sig) & SA_CORE) { 2405 p->p_sig = sig; 2406 /* 2407 * Log signals which would cause core dumps 2408 * (Log as LOG_INFO to appease those who don't want 2409 * these messages.) 2410 * XXX : Todo, as well as euid, write out ruid too 2411 * Note that coredump() drops proc lock. 2412 */ 2413 if (coredump(td) == 0) 2414 sig |= WCOREFLAG; 2415 if (kern_logsigexit) 2416 log(LOG_INFO, 2417 "pid %d (%s), uid %d: exited on signal %d%s\n", 2418 p->p_pid, p->p_comm, 2419 td->td_ucred ? td->td_ucred->cr_uid : -1, 2420 sig &~ WCOREFLAG, 2421 sig & WCOREFLAG ? " (core dumped)" : ""); 2422 } else 2423 PROC_UNLOCK(p); 2424 exit1(td, W_EXITCODE(0, sig)); 2425 /* NOTREACHED */ 2426} 2427 2428static char corefilename[MAXPATHLEN+1] = {"%N.core"}; 2429SYSCTL_STRING(_kern, OID_AUTO, corefile, CTLFLAG_RW, corefilename, 2430 sizeof(corefilename), "process corefile name format string"); 2431 2432/* 2433 * expand_name(name, uid, pid) 2434 * Expand the name described in corefilename, using name, uid, and pid. 2435 * corefilename is a printf-like string, with three format specifiers: 2436 * %N name of process ("name") 2437 * %P process id (pid) 2438 * %U user id (uid) 2439 * For example, "%N.core" is the default; they can be disabled completely 2440 * by using "/dev/null", or all core files can be stored in "/cores/%U/%N-%P". 2441 * This is controlled by the sysctl variable kern.corefile (see above). 2442 */ 2443 2444static char * 2445expand_name(name, uid, pid) 2446 const char *name; 2447 uid_t uid; 2448 pid_t pid; 2449{ 2450 const char *format, *appendstr; 2451 char *temp; 2452 char buf[11]; /* Buffer for pid/uid -- max 4B */ 2453 size_t i, l, n; 2454 2455 format = corefilename; 2456 temp = malloc(MAXPATHLEN, M_TEMP, M_NOWAIT | M_ZERO); 2457 if (temp == NULL) 2458 return (NULL); 2459 for (i = 0, n = 0; n < MAXPATHLEN && format[i]; i++) { 2460 switch (format[i]) { 2461 case '%': /* Format character */ 2462 i++; 2463 switch (format[i]) { 2464 case '%': 2465 appendstr = "%"; 2466 break; 2467 case 'N': /* process name */ 2468 appendstr = name; 2469 break; 2470 case 'P': /* process id */ 2471 sprintf(buf, "%u", pid); 2472 appendstr = buf; 2473 break; 2474 case 'U': /* user id */ 2475 sprintf(buf, "%u", uid); 2476 appendstr = buf; 2477 break; 2478 default: 2479 appendstr = ""; 2480 log(LOG_ERR, 2481 "Unknown format character %c in `%s'\n", 2482 format[i], format); 2483 } 2484 l = strlen(appendstr); 2485 if ((n + l) >= MAXPATHLEN) 2486 goto toolong; 2487 memcpy(temp + n, appendstr, l); 2488 n += l; 2489 break; 2490 default: 2491 temp[n++] = format[i]; 2492 } 2493 } 2494 if (format[i] != '\0') 2495 goto toolong; 2496 return (temp); 2497toolong: 2498 log(LOG_ERR, "pid %ld (%s), uid (%lu): corename is too long\n", 2499 (long)pid, name, (u_long)uid); 2500 free(temp, M_TEMP); 2501 return (NULL); 2502} 2503 2504/* 2505 * Dump a process' core. The main routine does some 2506 * policy checking, and creates the name of the coredump; 2507 * then it passes on a vnode and a size limit to the process-specific 2508 * coredump routine if there is one; if there _is not_ one, it returns 2509 * ENOSYS; otherwise it returns the error from the process-specific routine. 2510 */ 2511 2512static int 2513coredump(struct thread *td) 2514{ 2515 struct proc *p = td->td_proc; 2516 register struct vnode *vp; 2517 register struct ucred *cred = td->td_ucred; 2518 struct flock lf; 2519 struct nameidata nd; 2520 struct vattr vattr; 2521 int error, error1, flags, locked; 2522 struct mount *mp; 2523 char *name; /* name of corefile */ 2524 off_t limit; 2525 2526 PROC_LOCK_ASSERT(p, MA_OWNED); 2527 _STOPEVENT(p, S_CORE, 0); 2528 2529 if (((sugid_coredump == 0) && p->p_flag & P_SUGID) || do_coredump == 0) { 2530 PROC_UNLOCK(p); 2531 return (EFAULT); 2532 } 2533 2534 /* 2535 * Note that the bulk of limit checking is done after 2536 * the corefile is created. The exception is if the limit 2537 * for corefiles is 0, in which case we don't bother 2538 * creating the corefile at all. This layout means that 2539 * a corefile is truncated instead of not being created, 2540 * if it is larger than the limit. 2541 */ 2542 limit = (off_t)lim_cur(p, RLIMIT_CORE); 2543 PROC_UNLOCK(p); 2544 if (limit == 0) 2545 return (EFBIG); 2546 2547 mtx_lock(&Giant); 2548restart: 2549 name = expand_name(p->p_comm, td->td_ucred->cr_uid, p->p_pid); 2550 if (name == NULL) { 2551 mtx_unlock(&Giant); 2552 return (EINVAL); 2553 } 2554 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_SYSSPACE, name, td); /* XXXKSE */ 2555 flags = O_CREAT | FWRITE | O_NOFOLLOW; 2556 error = vn_open(&nd, &flags, S_IRUSR | S_IWUSR, -1); 2557 free(name, M_TEMP); 2558 if (error) { 2559 mtx_unlock(&Giant); 2560 return (error); 2561 } 2562 NDFREE(&nd, NDF_ONLY_PNBUF); 2563 vp = nd.ni_vp; 2564 2565 /* Don't dump to non-regular files or files with links. */ 2566 if (vp->v_type != VREG || 2567 VOP_GETATTR(vp, &vattr, cred, td) || vattr.va_nlink != 1) { 2568 VOP_UNLOCK(vp, 0, td); 2569 error = EFAULT; 2570 goto out; 2571 } 2572 2573 VOP_UNLOCK(vp, 0, td); 2574 lf.l_whence = SEEK_SET; 2575 lf.l_start = 0; 2576 lf.l_len = 0; 2577 lf.l_type = F_WRLCK; 2578 locked = (VOP_ADVLOCK(vp, (caddr_t)p, F_SETLK, &lf, F_FLOCK) == 0); 2579 2580 if (vn_start_write(vp, &mp, V_NOWAIT) != 0) { 2581 lf.l_type = F_UNLCK; 2582 if (locked) 2583 VOP_ADVLOCK(vp, (caddr_t)p, F_UNLCK, &lf, F_FLOCK); 2584 if ((error = vn_close(vp, FWRITE, cred, td)) != 0) 2585 return (error); 2586 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0) 2587 return (error); 2588 goto restart; 2589 } 2590 2591 VATTR_NULL(&vattr); 2592 vattr.va_size = 0; 2593 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td); 2594 VOP_LEASE(vp, td, cred, LEASE_WRITE); 2595 VOP_SETATTR(vp, &vattr, cred, td); 2596 VOP_UNLOCK(vp, 0, td); 2597 PROC_LOCK(p); 2598 p->p_acflag |= ACORE; 2599 PROC_UNLOCK(p); 2600 2601 error = p->p_sysent->sv_coredump ? 2602 p->p_sysent->sv_coredump(td, vp, limit) : 2603 ENOSYS; 2604 2605 if (locked) { 2606 lf.l_type = F_UNLCK; 2607 VOP_ADVLOCK(vp, (caddr_t)p, F_UNLCK, &lf, F_FLOCK); 2608 } 2609 vn_finished_write(mp); 2610out: 2611 error1 = vn_close(vp, FWRITE, cred, td); 2612 mtx_unlock(&Giant); 2613 if (error == 0) 2614 error = error1; 2615 return (error); 2616} 2617 2618/* 2619 * Nonexistent system call-- signal process (may want to handle it). 2620 * Flag error in case process won't see signal immediately (blocked or ignored). 2621 */ 2622#ifndef _SYS_SYSPROTO_H_ 2623struct nosys_args { 2624 int dummy; 2625}; 2626#endif 2627/* 2628 * MPSAFE 2629 */ 2630/* ARGSUSED */ 2631int 2632nosys(td, args) 2633 struct thread *td; 2634 struct nosys_args *args; 2635{ 2636 struct proc *p = td->td_proc; 2637 2638 PROC_LOCK(p); 2639 psignal(p, SIGSYS); 2640 PROC_UNLOCK(p); 2641 return (ENOSYS); 2642} 2643 2644/* 2645 * Send a SIGIO or SIGURG signal to a process or process group using 2646 * stored credentials rather than those of the current process. 2647 */ 2648void 2649pgsigio(sigiop, sig, checkctty) 2650 struct sigio **sigiop; 2651 int sig, checkctty; 2652{ 2653 struct sigio *sigio; 2654 2655 SIGIO_LOCK(); 2656 sigio = *sigiop; 2657 if (sigio == NULL) { 2658 SIGIO_UNLOCK(); 2659 return; 2660 } 2661 if (sigio->sio_pgid > 0) { 2662 PROC_LOCK(sigio->sio_proc); 2663 if (CANSIGIO(sigio->sio_ucred, sigio->sio_proc->p_ucred)) 2664 psignal(sigio->sio_proc, sig); 2665 PROC_UNLOCK(sigio->sio_proc); 2666 } else if (sigio->sio_pgid < 0) { 2667 struct proc *p; 2668 2669 PGRP_LOCK(sigio->sio_pgrp); 2670 LIST_FOREACH(p, &sigio->sio_pgrp->pg_members, p_pglist) { 2671 PROC_LOCK(p); 2672 if (CANSIGIO(sigio->sio_ucred, p->p_ucred) && 2673 (checkctty == 0 || (p->p_flag & P_CONTROLT))) 2674 psignal(p, sig); 2675 PROC_UNLOCK(p); 2676 } 2677 PGRP_UNLOCK(sigio->sio_pgrp); 2678 } 2679 SIGIO_UNLOCK(); 2680} 2681 2682static int 2683filt_sigattach(struct knote *kn) 2684{ 2685 struct proc *p = curproc; 2686 2687 kn->kn_ptr.p_proc = p; 2688 kn->kn_flags |= EV_CLEAR; /* automatically set */ 2689 2690 PROC_LOCK(p); 2691 SLIST_INSERT_HEAD(&p->p_klist, kn, kn_selnext); 2692 PROC_UNLOCK(p); 2693 2694 return (0); 2695} 2696 2697static void 2698filt_sigdetach(struct knote *kn) 2699{ 2700 struct proc *p = kn->kn_ptr.p_proc; 2701 2702 PROC_LOCK(p); 2703 SLIST_REMOVE(&p->p_klist, kn, knote, kn_selnext); 2704 PROC_UNLOCK(p); 2705} 2706 2707/* 2708 * signal knotes are shared with proc knotes, so we apply a mask to 2709 * the hint in order to differentiate them from process hints. This 2710 * could be avoided by using a signal-specific knote list, but probably 2711 * isn't worth the trouble. 2712 */ 2713static int 2714filt_signal(struct knote *kn, long hint) 2715{ 2716 2717 if (hint & NOTE_SIGNAL) { 2718 hint &= ~NOTE_SIGNAL; 2719 2720 if (kn->kn_id == hint) 2721 kn->kn_data++; 2722 } 2723 return (kn->kn_data != 0); 2724} 2725 2726struct sigacts * 2727sigacts_alloc(void) 2728{ 2729 struct sigacts *ps; 2730 2731 ps = malloc(sizeof(struct sigacts), M_SUBPROC, M_WAITOK | M_ZERO); 2732 ps->ps_refcnt = 1; 2733 mtx_init(&ps->ps_mtx, "sigacts", NULL, MTX_DEF); 2734 return (ps); 2735} 2736 2737void 2738sigacts_free(struct sigacts *ps) 2739{ 2740 2741 mtx_lock(&ps->ps_mtx); 2742 ps->ps_refcnt--; 2743 if (ps->ps_refcnt == 0) { 2744 mtx_destroy(&ps->ps_mtx); 2745 free(ps, M_SUBPROC); 2746 } else 2747 mtx_unlock(&ps->ps_mtx); 2748} 2749 2750struct sigacts * 2751sigacts_hold(struct sigacts *ps) 2752{ 2753 mtx_lock(&ps->ps_mtx); 2754 ps->ps_refcnt++; 2755 mtx_unlock(&ps->ps_mtx); 2756 return (ps); 2757} 2758 2759void 2760sigacts_copy(struct sigacts *dest, struct sigacts *src) 2761{ 2762 2763 KASSERT(dest->ps_refcnt == 1, ("sigacts_copy to shared dest")); 2764 mtx_lock(&src->ps_mtx); 2765 bcopy(src, dest, offsetof(struct sigacts, ps_refcnt)); 2766 mtx_unlock(&src->ps_mtx); 2767} 2768 2769int 2770sigacts_shared(struct sigacts *ps) 2771{ 2772 int shared; 2773 2774 mtx_lock(&ps->ps_mtx); 2775 shared = ps->ps_refcnt > 1; 2776 mtx_unlock(&ps->ps_mtx); 2777 return (shared); 2778}
| 1429 1430/* 1431 * Send a signal to a process group. 1432 */ 1433void 1434gsignal(pgid, sig) 1435 int pgid, sig; 1436{ 1437 struct pgrp *pgrp; 1438 1439 if (pgid != 0) { 1440 sx_slock(&proctree_lock); 1441 pgrp = pgfind(pgid); 1442 sx_sunlock(&proctree_lock); 1443 if (pgrp != NULL) { 1444 pgsignal(pgrp, sig, 0); 1445 PGRP_UNLOCK(pgrp); 1446 } 1447 } 1448} 1449 1450/* 1451 * Send a signal to a process group. If checktty is 1, 1452 * limit to members which have a controlling terminal. 1453 */ 1454void 1455pgsignal(pgrp, sig, checkctty) 1456 struct pgrp *pgrp; 1457 int sig, checkctty; 1458{ 1459 register struct proc *p; 1460 1461 if (pgrp) { 1462 PGRP_LOCK_ASSERT(pgrp, MA_OWNED); 1463 LIST_FOREACH(p, &pgrp->pg_members, p_pglist) { 1464 PROC_LOCK(p); 1465 if (checkctty == 0 || p->p_flag & P_CONTROLT) 1466 psignal(p, sig); 1467 PROC_UNLOCK(p); 1468 } 1469 } 1470} 1471 1472/* 1473 * Send a signal caused by a trap to the current thread. 1474 * If it will be caught immediately, deliver it with correct code. 1475 * Otherwise, post it normally. 1476 * 1477 * MPSAFE 1478 */ 1479void 1480trapsignal(struct thread *td, int sig, u_long code) 1481{ 1482 struct sigacts *ps; 1483 struct proc *p; 1484 siginfo_t siginfo; 1485 int error; 1486 1487 p = td->td_proc; 1488 if (td->td_pflags & TDP_SA) { 1489 if (td->td_mailbox == NULL) 1490 thread_user_enter(p, td); 1491 PROC_LOCK(p); 1492 if (td->td_mailbox) { 1493 SIGDELSET(td->td_sigmask, sig); 1494 mtx_lock_spin(&sched_lock); 1495 /* 1496 * Force scheduling an upcall, so UTS has chance to 1497 * process the signal before thread runs again in 1498 * userland. 1499 */ 1500 if (td->td_upcall) 1501 td->td_upcall->ku_flags |= KUF_DOUPCALL; 1502 mtx_unlock_spin(&sched_lock); 1503 } else { 1504 /* UTS caused a sync signal */ 1505 p->p_code = code; /* XXX for core dump/debugger */ 1506 p->p_sig = sig; /* XXX to verify code */ 1507 sigexit(td, sig); 1508 } 1509 } else { 1510 PROC_LOCK(p); 1511 } 1512 ps = p->p_sigacts; 1513 mtx_lock(&ps->ps_mtx); 1514 if ((p->p_flag & P_TRACED) == 0 && SIGISMEMBER(ps->ps_sigcatch, sig) && 1515 !SIGISMEMBER(td->td_sigmask, sig)) { 1516 p->p_stats->p_ru.ru_nsignals++; 1517#ifdef KTRACE 1518 if (KTRPOINT(curthread, KTR_PSIG)) 1519 ktrpsig(sig, ps->ps_sigact[_SIG_IDX(sig)], 1520 &td->td_sigmask, code); 1521#endif 1522 if (!(td->td_pflags & TDP_SA)) 1523 (*p->p_sysent->sv_sendsig)( 1524 ps->ps_sigact[_SIG_IDX(sig)], sig, 1525 &td->td_sigmask, code); 1526 else { 1527 cpu_thread_siginfo(sig, code, &siginfo); 1528 mtx_unlock(&ps->ps_mtx); 1529 PROC_UNLOCK(p); 1530 error = copyout(&siginfo, &td->td_mailbox->tm_syncsig, 1531 sizeof(siginfo)); 1532 PROC_LOCK(p); 1533 /* UTS memory corrupted */ 1534 if (error) 1535 sigexit(td, SIGILL); 1536 SIGADDSET(td->td_sigmask, sig); 1537 mtx_lock(&ps->ps_mtx); 1538 } 1539 SIGSETOR(td->td_sigmask, ps->ps_catchmask[_SIG_IDX(sig)]); 1540 if (!SIGISMEMBER(ps->ps_signodefer, sig)) 1541 SIGADDSET(td->td_sigmask, sig); 1542 if (SIGISMEMBER(ps->ps_sigreset, sig)) { 1543 /* 1544 * See kern_sigaction() for origin of this code. 1545 */ 1546 SIGDELSET(ps->ps_sigcatch, sig); 1547 if (sig != SIGCONT && 1548 sigprop(sig) & SA_IGNORE) 1549 SIGADDSET(ps->ps_sigignore, sig); 1550 ps->ps_sigact[_SIG_IDX(sig)] = SIG_DFL; 1551 } 1552 mtx_unlock(&ps->ps_mtx); 1553 } else { 1554 mtx_unlock(&ps->ps_mtx); 1555 p->p_code = code; /* XXX for core dump/debugger */ 1556 p->p_sig = sig; /* XXX to verify code */ 1557 tdsignal(td, sig, SIGTARGET_TD); 1558 } 1559 PROC_UNLOCK(p); 1560} 1561 1562static struct thread * 1563sigtd(struct proc *p, int sig, int prop) 1564{ 1565 struct thread *td, *signal_td; 1566 1567 PROC_LOCK_ASSERT(p, MA_OWNED); 1568 1569 /* 1570 * First find a thread in sigwait state and signal belongs to 1571 * its wait set. POSIX's arguments is that speed of delivering signal 1572 * to sigwait thread is faster than delivering signal to user stack. 1573 * If we can not find sigwait thread, then find the first thread in 1574 * the proc that doesn't have this signal masked, an exception is 1575 * if current thread is sending signal to its process, and it does not 1576 * mask the signal, it should get the signal, this is another fast 1577 * way to deliver signal. 1578 */ 1579 signal_td = NULL; 1580 mtx_lock_spin(&sched_lock); 1581 FOREACH_THREAD_IN_PROC(p, td) { 1582 if (td->td_waitset != NULL && 1583 SIGISMEMBER(*(td->td_waitset), sig)) { 1584 mtx_unlock_spin(&sched_lock); 1585 return (td); 1586 } 1587 if (!SIGISMEMBER(td->td_sigmask, sig)) { 1588 if (td == curthread) 1589 signal_td = curthread; 1590 else if (signal_td == NULL) 1591 signal_td = td; 1592 } 1593 } 1594 if (signal_td == NULL) 1595 signal_td = FIRST_THREAD_IN_PROC(p); 1596 mtx_unlock_spin(&sched_lock); 1597 return (signal_td); 1598} 1599 1600/* 1601 * Send the signal to the process. If the signal has an action, the action 1602 * is usually performed by the target process rather than the caller; we add 1603 * the signal to the set of pending signals for the process. 1604 * 1605 * Exceptions: 1606 * o When a stop signal is sent to a sleeping process that takes the 1607 * default action, the process is stopped without awakening it. 1608 * o SIGCONT restarts stopped processes (or puts them back to sleep) 1609 * regardless of the signal action (eg, blocked or ignored). 1610 * 1611 * Other ignored signals are discarded immediately. 1612 * 1613 * MPSAFE 1614 */ 1615void 1616psignal(struct proc *p, int sig) 1617{ 1618 struct thread *td; 1619 int prop; 1620 1621 if (!_SIG_VALID(sig)) 1622 panic("psignal(): invalid signal"); 1623 1624 PROC_LOCK_ASSERT(p, MA_OWNED); 1625 prop = sigprop(sig); 1626 1627 /* 1628 * Find a thread to deliver the signal to. 1629 */ 1630 td = sigtd(p, sig, prop); 1631 1632 tdsignal(td, sig, SIGTARGET_P); 1633} 1634 1635/* 1636 * MPSAFE 1637 */ 1638void 1639tdsignal(struct thread *td, int sig, sigtarget_t target) 1640{ 1641 sigset_t saved; 1642 struct proc *p = td->td_proc; 1643 1644 if (p->p_flag & P_SA) 1645 saved = p->p_siglist; 1646 do_tdsignal(td, sig, target); 1647 if ((p->p_flag & P_SA) && !(p->p_flag & P_SIGEVENT)) { 1648 if (SIGSETEQ(saved, p->p_siglist)) 1649 return; 1650 else { 1651 /* pending set changed */ 1652 p->p_flag |= P_SIGEVENT; 1653 wakeup(&p->p_siglist); 1654 } 1655 } 1656} 1657 1658static void 1659do_tdsignal(struct thread *td, int sig, sigtarget_t target) 1660{ 1661 struct proc *p; 1662 register sig_t action; 1663 sigset_t *siglist; 1664 struct thread *td0; 1665 register int prop; 1666 struct sigacts *ps; 1667 1668 if (!_SIG_VALID(sig)) 1669 panic("do_tdsignal(): invalid signal"); 1670 1671 p = td->td_proc; 1672 ps = p->p_sigacts; 1673 1674 PROC_LOCK_ASSERT(p, MA_OWNED); 1675 KNOTE(&p->p_klist, NOTE_SIGNAL | sig); 1676 1677 prop = sigprop(sig); 1678 1679 /* 1680 * If the signal is blocked and not destined for this thread, then 1681 * assign it to the process so that we can find it later in the first 1682 * thread that unblocks it. Otherwise, assign it to this thread now. 1683 */ 1684 if (target == SIGTARGET_TD) { 1685 siglist = &td->td_siglist; 1686 } else { 1687 if (!SIGISMEMBER(td->td_sigmask, sig)) 1688 siglist = &td->td_siglist; 1689 else if (td->td_waitset != NULL && 1690 SIGISMEMBER(*(td->td_waitset), sig)) 1691 siglist = &td->td_siglist; 1692 else 1693 siglist = &p->p_siglist; 1694 } 1695 1696 /* 1697 * If proc is traced, always give parent a chance; 1698 * if signal event is tracked by procfs, give *that* 1699 * a chance, as well. 1700 */ 1701 if ((p->p_flag & P_TRACED) || (p->p_stops & S_SIG)) { 1702 action = SIG_DFL; 1703 } else { 1704 /* 1705 * If the signal is being ignored, 1706 * then we forget about it immediately. 1707 * (Note: we don't set SIGCONT in ps_sigignore, 1708 * and if it is set to SIG_IGN, 1709 * action will be SIG_DFL here.) 1710 */ 1711 mtx_lock(&ps->ps_mtx); 1712 if (SIGISMEMBER(ps->ps_sigignore, sig) || 1713 (p->p_flag & P_WEXIT)) { 1714 mtx_unlock(&ps->ps_mtx); 1715 return; 1716 } 1717 if (((td->td_waitset == NULL) && 1718 SIGISMEMBER(td->td_sigmask, sig)) || 1719 ((td->td_waitset != NULL) && 1720 SIGISMEMBER(td->td_sigmask, sig) && 1721 !SIGISMEMBER(*(td->td_waitset), sig))) 1722 action = SIG_HOLD; 1723 else if (SIGISMEMBER(ps->ps_sigcatch, sig)) 1724 action = SIG_CATCH; 1725 else 1726 action = SIG_DFL; 1727 mtx_unlock(&ps->ps_mtx); 1728 } 1729 1730 if (prop & SA_CONT) { 1731 SIG_STOPSIGMASK(p->p_siglist); 1732 /* 1733 * XXX Should investigate leaving STOP and CONT sigs only in 1734 * the proc's siglist. 1735 */ 1736 mtx_lock_spin(&sched_lock); 1737 FOREACH_THREAD_IN_PROC(p, td0) 1738 SIG_STOPSIGMASK(td0->td_siglist); 1739 mtx_unlock_spin(&sched_lock); 1740 } 1741 1742 if (prop & SA_STOP) { 1743 /* 1744 * If sending a tty stop signal to a member of an orphaned 1745 * process group, discard the signal here if the action 1746 * is default; don't stop the process below if sleeping, 1747 * and don't clear any pending SIGCONT. 1748 */ 1749 if ((prop & SA_TTYSTOP) && 1750 (p->p_pgrp->pg_jobc == 0) && 1751 (action == SIG_DFL)) 1752 return; 1753 SIG_CONTSIGMASK(p->p_siglist); 1754 mtx_lock_spin(&sched_lock); 1755 FOREACH_THREAD_IN_PROC(p, td0) 1756 SIG_CONTSIGMASK(td0->td_siglist); 1757 mtx_unlock_spin(&sched_lock); 1758 p->p_flag &= ~P_CONTINUED; 1759 } 1760 1761 SIGADDSET(*siglist, sig); 1762 signotify(td); /* uses schedlock */ 1763 if (siglist == &td->td_siglist && (td->td_waitset != NULL) && 1764 action != SIG_HOLD) { 1765 td->td_waitset = NULL; 1766 } 1767 1768 /* 1769 * Defer further processing for signals which are held, 1770 * except that stopped processes must be continued by SIGCONT. 1771 */ 1772 if (action == SIG_HOLD && 1773 !((prop & SA_CONT) && (p->p_flag & P_STOPPED_SIG))) 1774 return; 1775 /* 1776 * Some signals have a process-wide effect and a per-thread 1777 * component. Most processing occurs when the process next 1778 * tries to cross the user boundary, however there are some 1779 * times when processing needs to be done immediatly, such as 1780 * waking up threads so that they can cross the user boundary. 1781 * We try do the per-process part here. 1782 */ 1783 if (P_SHOULDSTOP(p)) { 1784 /* 1785 * The process is in stopped mode. All the threads should be 1786 * either winding down or already on the suspended queue. 1787 */ 1788 if (p->p_flag & P_TRACED) { 1789 /* 1790 * The traced process is already stopped, 1791 * so no further action is necessary. 1792 * No signal can restart us. 1793 */ 1794 goto out; 1795 } 1796 1797 if (sig == SIGKILL) { 1798 /* 1799 * SIGKILL sets process running. 1800 * It will die elsewhere. 1801 * All threads must be restarted. 1802 */ 1803 p->p_flag &= ~P_STOPPED; 1804 goto runfast; 1805 } 1806 1807 if (prop & SA_CONT) { 1808 /* 1809 * If SIGCONT is default (or ignored), we continue the 1810 * process but don't leave the signal in siglist as 1811 * it has no further action. If SIGCONT is held, we 1812 * continue the process and leave the signal in 1813 * siglist. If the process catches SIGCONT, let it 1814 * handle the signal itself. If it isn't waiting on 1815 * an event, it goes back to run state. 1816 * Otherwise, process goes back to sleep state. 1817 */ 1818 p->p_flag &= ~P_STOPPED_SIG; 1819 p->p_flag |= P_CONTINUED; 1820 if (action == SIG_DFL) { 1821 SIGDELSET(*siglist, sig); 1822 } else if (action == SIG_CATCH) { 1823 /* 1824 * The process wants to catch it so it needs 1825 * to run at least one thread, but which one? 1826 * It would seem that the answer would be to 1827 * run an upcall in the next KSE to run, and 1828 * deliver the signal that way. In a NON KSE 1829 * process, we need to make sure that the 1830 * single thread is runnable asap. 1831 * XXXKSE for now however, make them all run. 1832 */ 1833 goto runfast; 1834 } 1835 /* 1836 * The signal is not ignored or caught. 1837 */ 1838 mtx_lock_spin(&sched_lock); 1839 thread_unsuspend(p); 1840 mtx_unlock_spin(&sched_lock); 1841 goto out; 1842 } 1843 1844 if (prop & SA_STOP) { 1845 /* 1846 * Already stopped, don't need to stop again 1847 * (If we did the shell could get confused). 1848 * Just make sure the signal STOP bit set. 1849 */ 1850 p->p_flag |= P_STOPPED_SIG; 1851 SIGDELSET(*siglist, sig); 1852 goto out; 1853 } 1854 1855 /* 1856 * All other kinds of signals: 1857 * If a thread is sleeping interruptibly, simulate a 1858 * wakeup so that when it is continued it will be made 1859 * runnable and can look at the signal. However, don't make 1860 * the PROCESS runnable, leave it stopped. 1861 * It may run a bit until it hits a thread_suspend_check(). 1862 */ 1863 mtx_lock_spin(&sched_lock); 1864 if (TD_ON_SLEEPQ(td) && (td->td_flags & TDF_SINTR)) 1865 sleepq_abort(td); 1866 mtx_unlock_spin(&sched_lock); 1867 goto out; 1868 /* 1869 * Mutexes are short lived. Threads waiting on them will 1870 * hit thread_suspend_check() soon. 1871 */ 1872 } else if (p->p_state == PRS_NORMAL) { 1873 if ((p->p_flag & P_TRACED) || (action != SIG_DFL) || 1874 !(prop & SA_STOP)) { 1875 mtx_lock_spin(&sched_lock); 1876 tdsigwakeup(td, sig, action); 1877 mtx_unlock_spin(&sched_lock); 1878 goto out; 1879 } 1880 if (prop & SA_STOP) { 1881 if (p->p_flag & P_PPWAIT) 1882 goto out; 1883 p->p_flag |= P_STOPPED_SIG; 1884 p->p_xstat = sig; 1885 mtx_lock_spin(&sched_lock); 1886 FOREACH_THREAD_IN_PROC(p, td0) { 1887 if (TD_IS_SLEEPING(td0) && 1888 (td0->td_flags & TDF_SINTR) && 1889 !TD_IS_SUSPENDED(td0)) { 1890 thread_suspend_one(td0); 1891 } else if (td != td0) { 1892 td0->td_flags |= TDF_ASTPENDING; 1893 } 1894 } 1895 thread_stopped(p); 1896 if (p->p_numthreads == p->p_suspcount) { 1897 SIGDELSET(p->p_siglist, p->p_xstat); 1898 FOREACH_THREAD_IN_PROC(p, td0) 1899 SIGDELSET(td0->td_siglist, p->p_xstat); 1900 } 1901 mtx_unlock_spin(&sched_lock); 1902 goto out; 1903 } 1904 else 1905 goto runfast; 1906 /* NOTREACHED */ 1907 } else { 1908 /* Not in "NORMAL" state. discard the signal. */ 1909 SIGDELSET(*siglist, sig); 1910 goto out; 1911 } 1912 1913 /* 1914 * The process is not stopped so we need to apply the signal to all the 1915 * running threads. 1916 */ 1917 1918runfast: 1919 mtx_lock_spin(&sched_lock); 1920 tdsigwakeup(td, sig, action); 1921 thread_unsuspend(p); 1922 mtx_unlock_spin(&sched_lock); 1923out: 1924 /* If we jump here, sched_lock should not be owned. */ 1925 mtx_assert(&sched_lock, MA_NOTOWNED); 1926} 1927 1928/* 1929 * The force of a signal has been directed against a single 1930 * thread. We need to see what we can do about knocking it 1931 * out of any sleep it may be in etc. 1932 */ 1933static void 1934tdsigwakeup(struct thread *td, int sig, sig_t action) 1935{ 1936 struct proc *p = td->td_proc; 1937 register int prop; 1938 1939 PROC_LOCK_ASSERT(p, MA_OWNED); 1940 mtx_assert(&sched_lock, MA_OWNED); 1941 prop = sigprop(sig); 1942 1943 /* 1944 * Bring the priority of a thread up if we want it to get 1945 * killed in this lifetime. 1946 */ 1947 if (action == SIG_DFL && (prop & SA_KILL)) { 1948 if (td->td_priority > PUSER) 1949 td->td_priority = PUSER; 1950 } 1951 1952 if (TD_ON_SLEEPQ(td)) { 1953 /* 1954 * If thread is sleeping uninterruptibly 1955 * we can't interrupt the sleep... the signal will 1956 * be noticed when the process returns through 1957 * trap() or syscall(). 1958 */ 1959 if ((td->td_flags & TDF_SINTR) == 0) 1960 return; 1961 /* 1962 * Process is sleeping and traced. Make it runnable 1963 * so it can discover the signal in issignal() and stop 1964 * for its parent. 1965 */ 1966 if (p->p_flag & P_TRACED) { 1967 p->p_flag &= ~P_STOPPED_TRACE; 1968 } else { 1969 /* 1970 * If SIGCONT is default (or ignored) and process is 1971 * asleep, we are finished; the process should not 1972 * be awakened. 1973 */ 1974 if ((prop & SA_CONT) && action == SIG_DFL) { 1975 SIGDELSET(p->p_siglist, sig); 1976 /* 1977 * It may be on either list in this state. 1978 * Remove from both for now. 1979 */ 1980 SIGDELSET(td->td_siglist, sig); 1981 return; 1982 } 1983 1984 /* 1985 * Give low priority threads a better chance to run. 1986 */ 1987 if (td->td_priority > PUSER) 1988 td->td_priority = PUSER; 1989 } 1990 sleepq_abort(td); 1991 } else { 1992 /* 1993 * Other states do nothing with the signal immediately, 1994 * other than kicking ourselves if we are running. 1995 * It will either never be noticed, or noticed very soon. 1996 */ 1997#ifdef SMP 1998 if (TD_IS_RUNNING(td) && td != curthread) 1999 forward_signal(td); 2000#endif 2001 } 2002} 2003 2004void 2005ptracestop(struct thread *td, int sig) 2006{ 2007 struct proc *p = td->td_proc; 2008 2009 PROC_LOCK_ASSERT(p, MA_OWNED); 2010 WITNESS_WARN(WARN_GIANTOK | WARN_SLEEPOK, 2011 &p->p_mtx.mtx_object, "Stopping for traced signal"); 2012 2013 p->p_xstat = sig; 2014 PROC_LOCK(p->p_pptr); 2015 psignal(p->p_pptr, SIGCHLD); 2016 PROC_UNLOCK(p->p_pptr); 2017 stop(p); 2018 mtx_lock_spin(&sched_lock); 2019 thread_suspend_one(td); 2020 PROC_UNLOCK(p); 2021 DROP_GIANT(); 2022 mi_switch(SW_INVOL); 2023 mtx_unlock_spin(&sched_lock); 2024 PICKUP_GIANT(); 2025} 2026 2027/* 2028 * If the current process has received a signal (should be caught or cause 2029 * termination, should interrupt current syscall), return the signal number. 2030 * Stop signals with default action are processed immediately, then cleared; 2031 * they aren't returned. This is checked after each entry to the system for 2032 * a syscall or trap (though this can usually be done without calling issignal 2033 * by checking the pending signal masks in cursig.) The normal call 2034 * sequence is 2035 * 2036 * while (sig = cursig(curthread)) 2037 * postsig(sig); 2038 */ 2039static int 2040issignal(td) 2041 struct thread *td; 2042{ 2043 struct proc *p; 2044 struct sigacts *ps; 2045 sigset_t sigpending; 2046 int sig, prop; 2047 struct thread *td0; 2048 2049 p = td->td_proc; 2050 ps = p->p_sigacts; 2051 mtx_assert(&ps->ps_mtx, MA_OWNED); 2052 PROC_LOCK_ASSERT(p, MA_OWNED); 2053 for (;;) { 2054 int traced = (p->p_flag & P_TRACED) || (p->p_stops & S_SIG); 2055 2056 sigpending = td->td_siglist; 2057 SIGSETNAND(sigpending, td->td_sigmask); 2058 2059 if (p->p_flag & P_PPWAIT) 2060 SIG_STOPSIGMASK(sigpending); 2061 if (SIGISEMPTY(sigpending)) /* no signal to send */ 2062 return (0); 2063 sig = sig_ffs(&sigpending); 2064 2065 if (p->p_stops & S_SIG) { 2066 mtx_unlock(&ps->ps_mtx); 2067 stopevent(p, S_SIG, sig); 2068 mtx_lock(&ps->ps_mtx); 2069 } 2070 2071 /* 2072 * We should see pending but ignored signals 2073 * only if P_TRACED was on when they were posted. 2074 */ 2075 if (SIGISMEMBER(ps->ps_sigignore, sig) && (traced == 0)) { 2076 SIGDELSET(td->td_siglist, sig); 2077 continue; 2078 } 2079 if (p->p_flag & P_TRACED && (p->p_flag & P_PPWAIT) == 0) { 2080 /* 2081 * If traced, always stop. 2082 */ 2083 mtx_unlock(&ps->ps_mtx); 2084 ptracestop(td, sig); 2085 PROC_LOCK(p); 2086 mtx_lock(&ps->ps_mtx); 2087 2088 /* 2089 * If parent wants us to take the signal, 2090 * then it will leave it in p->p_xstat; 2091 * otherwise we just look for signals again. 2092 */ 2093 SIGDELSET(td->td_siglist, sig); /* clear old signal */ 2094 sig = p->p_xstat; 2095 if (sig == 0) 2096 continue; 2097 2098 /* 2099 * If the traced bit got turned off, go back up 2100 * to the top to rescan signals. This ensures 2101 * that p_sig* and p_sigact are consistent. 2102 */ 2103 if ((p->p_flag & P_TRACED) == 0) 2104 continue; 2105 2106 /* 2107 * Put the new signal into td_siglist. If the 2108 * signal is being masked, look for other signals. 2109 */ 2110 SIGADDSET(td->td_siglist, sig); 2111 if (SIGISMEMBER(td->td_sigmask, sig)) 2112 continue; 2113 signotify(td); 2114 } 2115 2116 prop = sigprop(sig); 2117 2118 /* 2119 * Decide whether the signal should be returned. 2120 * Return the signal's number, or fall through 2121 * to clear it from the pending mask. 2122 */ 2123 switch ((intptr_t)p->p_sigacts->ps_sigact[_SIG_IDX(sig)]) { 2124 2125 case (intptr_t)SIG_DFL: 2126 /* 2127 * Don't take default actions on system processes. 2128 */ 2129 if (p->p_pid <= 1) { 2130#ifdef DIAGNOSTIC 2131 /* 2132 * Are you sure you want to ignore SIGSEGV 2133 * in init? XXX 2134 */ 2135 printf("Process (pid %lu) got signal %d\n", 2136 (u_long)p->p_pid, sig); 2137#endif 2138 break; /* == ignore */ 2139 } 2140 /* 2141 * If there is a pending stop signal to process 2142 * with default action, stop here, 2143 * then clear the signal. However, 2144 * if process is member of an orphaned 2145 * process group, ignore tty stop signals. 2146 */ 2147 if (prop & SA_STOP) { 2148 if (p->p_flag & P_TRACED || 2149 (p->p_pgrp->pg_jobc == 0 && 2150 prop & SA_TTYSTOP)) 2151 break; /* == ignore */ 2152 mtx_unlock(&ps->ps_mtx); 2153 WITNESS_WARN(WARN_GIANTOK | WARN_SLEEPOK, 2154 &p->p_mtx.mtx_object, "Catching SIGSTOP"); 2155 p->p_flag |= P_STOPPED_SIG; 2156 p->p_xstat = sig; 2157 mtx_lock_spin(&sched_lock); 2158 FOREACH_THREAD_IN_PROC(p, td0) { 2159 if (TD_IS_SLEEPING(td0) && 2160 (td0->td_flags & TDF_SINTR) && 2161 !TD_IS_SUSPENDED(td0)) { 2162 thread_suspend_one(td0); 2163 } else if (td != td0) { 2164 td0->td_flags |= TDF_ASTPENDING; 2165 } 2166 } 2167 thread_stopped(p); 2168 thread_suspend_one(td); 2169 PROC_UNLOCK(p); 2170 DROP_GIANT(); 2171 mi_switch(SW_INVOL); 2172 mtx_unlock_spin(&sched_lock); 2173 PICKUP_GIANT(); 2174 PROC_LOCK(p); 2175 mtx_lock(&ps->ps_mtx); 2176 break; 2177 } else if (prop & SA_IGNORE) { 2178 /* 2179 * Except for SIGCONT, shouldn't get here. 2180 * Default action is to ignore; drop it. 2181 */ 2182 break; /* == ignore */ 2183 } else 2184 return (sig); 2185 /*NOTREACHED*/ 2186 2187 case (intptr_t)SIG_IGN: 2188 /* 2189 * Masking above should prevent us ever trying 2190 * to take action on an ignored signal other 2191 * than SIGCONT, unless process is traced. 2192 */ 2193 if ((prop & SA_CONT) == 0 && 2194 (p->p_flag & P_TRACED) == 0) 2195 printf("issignal\n"); 2196 break; /* == ignore */ 2197 2198 default: 2199 /* 2200 * This signal has an action, let 2201 * postsig() process it. 2202 */ 2203 return (sig); 2204 } 2205 SIGDELSET(td->td_siglist, sig); /* take the signal! */ 2206 } 2207 /* NOTREACHED */ 2208} 2209 2210/* 2211 * Put the argument process into the stopped state and notify the parent 2212 * via wakeup. Signals are handled elsewhere. The process must not be 2213 * on the run queue. Must be called with the proc p locked. 2214 */ 2215static void 2216stop(struct proc *p) 2217{ 2218 2219 PROC_LOCK_ASSERT(p, MA_OWNED); 2220 p->p_flag |= P_STOPPED_SIG; 2221 p->p_flag &= ~P_WAITED; 2222 wakeup(p->p_pptr); 2223} 2224 2225/* 2226 * MPSAFE 2227 */ 2228void 2229thread_stopped(struct proc *p) 2230{ 2231 struct proc *p1 = curthread->td_proc; 2232 struct sigacts *ps; 2233 int n; 2234 2235 PROC_LOCK_ASSERT(p, MA_OWNED); 2236 mtx_assert(&sched_lock, MA_OWNED); 2237 n = p->p_suspcount; 2238 if (p == p1) 2239 n++; 2240 if ((p->p_flag & P_STOPPED_SIG) && (n == p->p_numthreads)) { 2241 mtx_unlock_spin(&sched_lock); 2242 stop(p); 2243 PROC_LOCK(p->p_pptr); 2244 ps = p->p_pptr->p_sigacts; 2245 mtx_lock(&ps->ps_mtx); 2246 if ((ps->ps_flag & PS_NOCLDSTOP) == 0) { 2247 mtx_unlock(&ps->ps_mtx); 2248 psignal(p->p_pptr, SIGCHLD); 2249 } else 2250 mtx_unlock(&ps->ps_mtx); 2251 PROC_UNLOCK(p->p_pptr); 2252 mtx_lock_spin(&sched_lock); 2253 } 2254} 2255 2256/* 2257 * Take the action for the specified signal 2258 * from the current set of pending signals. 2259 */ 2260void 2261postsig(sig) 2262 register int sig; 2263{ 2264 struct thread *td = curthread; 2265 register struct proc *p = td->td_proc; 2266 struct sigacts *ps; 2267 sig_t action; 2268 sigset_t returnmask; 2269 int code; 2270 2271 KASSERT(sig != 0, ("postsig")); 2272 2273 PROC_LOCK_ASSERT(p, MA_OWNED); 2274 ps = p->p_sigacts; 2275 mtx_assert(&ps->ps_mtx, MA_OWNED); 2276 SIGDELSET(td->td_siglist, sig); 2277 action = ps->ps_sigact[_SIG_IDX(sig)]; 2278#ifdef KTRACE 2279 if (KTRPOINT(td, KTR_PSIG)) 2280 ktrpsig(sig, action, td->td_pflags & TDP_OLDMASK ? 2281 &td->td_oldsigmask : &td->td_sigmask, 0); 2282#endif 2283 if (p->p_stops & S_SIG) { 2284 mtx_unlock(&ps->ps_mtx); 2285 stopevent(p, S_SIG, sig); 2286 mtx_lock(&ps->ps_mtx); 2287 } 2288 2289 if (!(td->td_pflags & TDP_SA && td->td_mailbox) && 2290 action == SIG_DFL) { 2291 /* 2292 * Default action, where the default is to kill 2293 * the process. (Other cases were ignored above.) 2294 */ 2295 mtx_unlock(&ps->ps_mtx); 2296 sigexit(td, sig); 2297 /* NOTREACHED */ 2298 } else { 2299 if (td->td_pflags & TDP_SA && td->td_mailbox) { 2300 if (sig == SIGKILL) { 2301 mtx_unlock(&ps->ps_mtx); 2302 sigexit(td, sig); 2303 } 2304 } 2305 2306 /* 2307 * If we get here, the signal must be caught. 2308 */ 2309 KASSERT(action != SIG_IGN && !SIGISMEMBER(td->td_sigmask, sig), 2310 ("postsig action")); 2311 /* 2312 * Set the new mask value and also defer further 2313 * occurrences of this signal. 2314 * 2315 * Special case: user has done a sigsuspend. Here the 2316 * current mask is not of interest, but rather the 2317 * mask from before the sigsuspend is what we want 2318 * restored after the signal processing is completed. 2319 */ 2320 if (td->td_pflags & TDP_OLDMASK) { 2321 returnmask = td->td_oldsigmask; 2322 td->td_pflags &= ~TDP_OLDMASK; 2323 } else 2324 returnmask = td->td_sigmask; 2325 2326 SIGSETOR(td->td_sigmask, ps->ps_catchmask[_SIG_IDX(sig)]); 2327 if (!SIGISMEMBER(ps->ps_signodefer, sig)) 2328 SIGADDSET(td->td_sigmask, sig); 2329 2330 if (SIGISMEMBER(ps->ps_sigreset, sig)) { 2331 /* 2332 * See kern_sigaction() for origin of this code. 2333 */ 2334 SIGDELSET(ps->ps_sigcatch, sig); 2335 if (sig != SIGCONT && 2336 sigprop(sig) & SA_IGNORE) 2337 SIGADDSET(ps->ps_sigignore, sig); 2338 ps->ps_sigact[_SIG_IDX(sig)] = SIG_DFL; 2339 } 2340 p->p_stats->p_ru.ru_nsignals++; 2341 if (p->p_sig != sig) { 2342 code = 0; 2343 } else { 2344 code = p->p_code; 2345 p->p_code = 0; 2346 p->p_sig = 0; 2347 } 2348 if (td->td_pflags & TDP_SA && td->td_mailbox) 2349 thread_signal_add(curthread, sig); 2350 else 2351 (*p->p_sysent->sv_sendsig)(action, sig, 2352 &returnmask, code); 2353 } 2354} 2355 2356/* 2357 * Kill the current process for stated reason. 2358 */ 2359void 2360killproc(p, why) 2361 struct proc *p; 2362 char *why; 2363{ 2364 2365 PROC_LOCK_ASSERT(p, MA_OWNED); 2366 CTR3(KTR_PROC, "killproc: proc %p (pid %d, %s)", 2367 p, p->p_pid, p->p_comm); 2368 log(LOG_ERR, "pid %d (%s), uid %d, was killed: %s\n", p->p_pid, p->p_comm, 2369 p->p_ucred ? p->p_ucred->cr_uid : -1, why); 2370 psignal(p, SIGKILL); 2371} 2372 2373/* 2374 * Force the current process to exit with the specified signal, dumping core 2375 * if appropriate. We bypass the normal tests for masked and caught signals, 2376 * allowing unrecoverable failures to terminate the process without changing 2377 * signal state. Mark the accounting record with the signal termination. 2378 * If dumping core, save the signal number for the debugger. Calls exit and 2379 * does not return. 2380 * 2381 * MPSAFE 2382 */ 2383void 2384sigexit(td, sig) 2385 struct thread *td; 2386 int sig; 2387{ 2388 struct proc *p = td->td_proc; 2389 2390 PROC_LOCK_ASSERT(p, MA_OWNED); 2391 p->p_acflag |= AXSIG; 2392 if (sigprop(sig) & SA_CORE) { 2393 p->p_sig = sig; 2394 /* 2395 * Log signals which would cause core dumps 2396 * (Log as LOG_INFO to appease those who don't want 2397 * these messages.) 2398 * XXX : Todo, as well as euid, write out ruid too 2399 * Note that coredump() drops proc lock. 2400 */ 2401 if (coredump(td) == 0) 2402 sig |= WCOREFLAG; 2403 if (kern_logsigexit) 2404 log(LOG_INFO, 2405 "pid %d (%s), uid %d: exited on signal %d%s\n", 2406 p->p_pid, p->p_comm, 2407 td->td_ucred ? td->td_ucred->cr_uid : -1, 2408 sig &~ WCOREFLAG, 2409 sig & WCOREFLAG ? " (core dumped)" : ""); 2410 } else 2411 PROC_UNLOCK(p); 2412 exit1(td, W_EXITCODE(0, sig)); 2413 /* NOTREACHED */ 2414} 2415 2416static char corefilename[MAXPATHLEN+1] = {"%N.core"}; 2417SYSCTL_STRING(_kern, OID_AUTO, corefile, CTLFLAG_RW, corefilename, 2418 sizeof(corefilename), "process corefile name format string"); 2419 2420/* 2421 * expand_name(name, uid, pid) 2422 * Expand the name described in corefilename, using name, uid, and pid. 2423 * corefilename is a printf-like string, with three format specifiers: 2424 * %N name of process ("name") 2425 * %P process id (pid) 2426 * %U user id (uid) 2427 * For example, "%N.core" is the default; they can be disabled completely 2428 * by using "/dev/null", or all core files can be stored in "/cores/%U/%N-%P". 2429 * This is controlled by the sysctl variable kern.corefile (see above). 2430 */ 2431 2432static char * 2433expand_name(name, uid, pid) 2434 const char *name; 2435 uid_t uid; 2436 pid_t pid; 2437{ 2438 const char *format, *appendstr; 2439 char *temp; 2440 char buf[11]; /* Buffer for pid/uid -- max 4B */ 2441 size_t i, l, n; 2442 2443 format = corefilename; 2444 temp = malloc(MAXPATHLEN, M_TEMP, M_NOWAIT | M_ZERO); 2445 if (temp == NULL) 2446 return (NULL); 2447 for (i = 0, n = 0; n < MAXPATHLEN && format[i]; i++) { 2448 switch (format[i]) { 2449 case '%': /* Format character */ 2450 i++; 2451 switch (format[i]) { 2452 case '%': 2453 appendstr = "%"; 2454 break; 2455 case 'N': /* process name */ 2456 appendstr = name; 2457 break; 2458 case 'P': /* process id */ 2459 sprintf(buf, "%u", pid); 2460 appendstr = buf; 2461 break; 2462 case 'U': /* user id */ 2463 sprintf(buf, "%u", uid); 2464 appendstr = buf; 2465 break; 2466 default: 2467 appendstr = ""; 2468 log(LOG_ERR, 2469 "Unknown format character %c in `%s'\n", 2470 format[i], format); 2471 } 2472 l = strlen(appendstr); 2473 if ((n + l) >= MAXPATHLEN) 2474 goto toolong; 2475 memcpy(temp + n, appendstr, l); 2476 n += l; 2477 break; 2478 default: 2479 temp[n++] = format[i]; 2480 } 2481 } 2482 if (format[i] != '\0') 2483 goto toolong; 2484 return (temp); 2485toolong: 2486 log(LOG_ERR, "pid %ld (%s), uid (%lu): corename is too long\n", 2487 (long)pid, name, (u_long)uid); 2488 free(temp, M_TEMP); 2489 return (NULL); 2490} 2491 2492/* 2493 * Dump a process' core. The main routine does some 2494 * policy checking, and creates the name of the coredump; 2495 * then it passes on a vnode and a size limit to the process-specific 2496 * coredump routine if there is one; if there _is not_ one, it returns 2497 * ENOSYS; otherwise it returns the error from the process-specific routine. 2498 */ 2499 2500static int 2501coredump(struct thread *td) 2502{ 2503 struct proc *p = td->td_proc; 2504 register struct vnode *vp; 2505 register struct ucred *cred = td->td_ucred; 2506 struct flock lf; 2507 struct nameidata nd; 2508 struct vattr vattr; 2509 int error, error1, flags, locked; 2510 struct mount *mp; 2511 char *name; /* name of corefile */ 2512 off_t limit; 2513 2514 PROC_LOCK_ASSERT(p, MA_OWNED); 2515 _STOPEVENT(p, S_CORE, 0); 2516 2517 if (((sugid_coredump == 0) && p->p_flag & P_SUGID) || do_coredump == 0) { 2518 PROC_UNLOCK(p); 2519 return (EFAULT); 2520 } 2521 2522 /* 2523 * Note that the bulk of limit checking is done after 2524 * the corefile is created. The exception is if the limit 2525 * for corefiles is 0, in which case we don't bother 2526 * creating the corefile at all. This layout means that 2527 * a corefile is truncated instead of not being created, 2528 * if it is larger than the limit. 2529 */ 2530 limit = (off_t)lim_cur(p, RLIMIT_CORE); 2531 PROC_UNLOCK(p); 2532 if (limit == 0) 2533 return (EFBIG); 2534 2535 mtx_lock(&Giant); 2536restart: 2537 name = expand_name(p->p_comm, td->td_ucred->cr_uid, p->p_pid); 2538 if (name == NULL) { 2539 mtx_unlock(&Giant); 2540 return (EINVAL); 2541 } 2542 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_SYSSPACE, name, td); /* XXXKSE */ 2543 flags = O_CREAT | FWRITE | O_NOFOLLOW; 2544 error = vn_open(&nd, &flags, S_IRUSR | S_IWUSR, -1); 2545 free(name, M_TEMP); 2546 if (error) { 2547 mtx_unlock(&Giant); 2548 return (error); 2549 } 2550 NDFREE(&nd, NDF_ONLY_PNBUF); 2551 vp = nd.ni_vp; 2552 2553 /* Don't dump to non-regular files or files with links. */ 2554 if (vp->v_type != VREG || 2555 VOP_GETATTR(vp, &vattr, cred, td) || vattr.va_nlink != 1) { 2556 VOP_UNLOCK(vp, 0, td); 2557 error = EFAULT; 2558 goto out; 2559 } 2560 2561 VOP_UNLOCK(vp, 0, td); 2562 lf.l_whence = SEEK_SET; 2563 lf.l_start = 0; 2564 lf.l_len = 0; 2565 lf.l_type = F_WRLCK; 2566 locked = (VOP_ADVLOCK(vp, (caddr_t)p, F_SETLK, &lf, F_FLOCK) == 0); 2567 2568 if (vn_start_write(vp, &mp, V_NOWAIT) != 0) { 2569 lf.l_type = F_UNLCK; 2570 if (locked) 2571 VOP_ADVLOCK(vp, (caddr_t)p, F_UNLCK, &lf, F_FLOCK); 2572 if ((error = vn_close(vp, FWRITE, cred, td)) != 0) 2573 return (error); 2574 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0) 2575 return (error); 2576 goto restart; 2577 } 2578 2579 VATTR_NULL(&vattr); 2580 vattr.va_size = 0; 2581 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td); 2582 VOP_LEASE(vp, td, cred, LEASE_WRITE); 2583 VOP_SETATTR(vp, &vattr, cred, td); 2584 VOP_UNLOCK(vp, 0, td); 2585 PROC_LOCK(p); 2586 p->p_acflag |= ACORE; 2587 PROC_UNLOCK(p); 2588 2589 error = p->p_sysent->sv_coredump ? 2590 p->p_sysent->sv_coredump(td, vp, limit) : 2591 ENOSYS; 2592 2593 if (locked) { 2594 lf.l_type = F_UNLCK; 2595 VOP_ADVLOCK(vp, (caddr_t)p, F_UNLCK, &lf, F_FLOCK); 2596 } 2597 vn_finished_write(mp); 2598out: 2599 error1 = vn_close(vp, FWRITE, cred, td); 2600 mtx_unlock(&Giant); 2601 if (error == 0) 2602 error = error1; 2603 return (error); 2604} 2605 2606/* 2607 * Nonexistent system call-- signal process (may want to handle it). 2608 * Flag error in case process won't see signal immediately (blocked or ignored). 2609 */ 2610#ifndef _SYS_SYSPROTO_H_ 2611struct nosys_args { 2612 int dummy; 2613}; 2614#endif 2615/* 2616 * MPSAFE 2617 */ 2618/* ARGSUSED */ 2619int 2620nosys(td, args) 2621 struct thread *td; 2622 struct nosys_args *args; 2623{ 2624 struct proc *p = td->td_proc; 2625 2626 PROC_LOCK(p); 2627 psignal(p, SIGSYS); 2628 PROC_UNLOCK(p); 2629 return (ENOSYS); 2630} 2631 2632/* 2633 * Send a SIGIO or SIGURG signal to a process or process group using 2634 * stored credentials rather than those of the current process. 2635 */ 2636void 2637pgsigio(sigiop, sig, checkctty) 2638 struct sigio **sigiop; 2639 int sig, checkctty; 2640{ 2641 struct sigio *sigio; 2642 2643 SIGIO_LOCK(); 2644 sigio = *sigiop; 2645 if (sigio == NULL) { 2646 SIGIO_UNLOCK(); 2647 return; 2648 } 2649 if (sigio->sio_pgid > 0) { 2650 PROC_LOCK(sigio->sio_proc); 2651 if (CANSIGIO(sigio->sio_ucred, sigio->sio_proc->p_ucred)) 2652 psignal(sigio->sio_proc, sig); 2653 PROC_UNLOCK(sigio->sio_proc); 2654 } else if (sigio->sio_pgid < 0) { 2655 struct proc *p; 2656 2657 PGRP_LOCK(sigio->sio_pgrp); 2658 LIST_FOREACH(p, &sigio->sio_pgrp->pg_members, p_pglist) { 2659 PROC_LOCK(p); 2660 if (CANSIGIO(sigio->sio_ucred, p->p_ucred) && 2661 (checkctty == 0 || (p->p_flag & P_CONTROLT))) 2662 psignal(p, sig); 2663 PROC_UNLOCK(p); 2664 } 2665 PGRP_UNLOCK(sigio->sio_pgrp); 2666 } 2667 SIGIO_UNLOCK(); 2668} 2669 2670static int 2671filt_sigattach(struct knote *kn) 2672{ 2673 struct proc *p = curproc; 2674 2675 kn->kn_ptr.p_proc = p; 2676 kn->kn_flags |= EV_CLEAR; /* automatically set */ 2677 2678 PROC_LOCK(p); 2679 SLIST_INSERT_HEAD(&p->p_klist, kn, kn_selnext); 2680 PROC_UNLOCK(p); 2681 2682 return (0); 2683} 2684 2685static void 2686filt_sigdetach(struct knote *kn) 2687{ 2688 struct proc *p = kn->kn_ptr.p_proc; 2689 2690 PROC_LOCK(p); 2691 SLIST_REMOVE(&p->p_klist, kn, knote, kn_selnext); 2692 PROC_UNLOCK(p); 2693} 2694 2695/* 2696 * signal knotes are shared with proc knotes, so we apply a mask to 2697 * the hint in order to differentiate them from process hints. This 2698 * could be avoided by using a signal-specific knote list, but probably 2699 * isn't worth the trouble. 2700 */ 2701static int 2702filt_signal(struct knote *kn, long hint) 2703{ 2704 2705 if (hint & NOTE_SIGNAL) { 2706 hint &= ~NOTE_SIGNAL; 2707 2708 if (kn->kn_id == hint) 2709 kn->kn_data++; 2710 } 2711 return (kn->kn_data != 0); 2712} 2713 2714struct sigacts * 2715sigacts_alloc(void) 2716{ 2717 struct sigacts *ps; 2718 2719 ps = malloc(sizeof(struct sigacts), M_SUBPROC, M_WAITOK | M_ZERO); 2720 ps->ps_refcnt = 1; 2721 mtx_init(&ps->ps_mtx, "sigacts", NULL, MTX_DEF); 2722 return (ps); 2723} 2724 2725void 2726sigacts_free(struct sigacts *ps) 2727{ 2728 2729 mtx_lock(&ps->ps_mtx); 2730 ps->ps_refcnt--; 2731 if (ps->ps_refcnt == 0) { 2732 mtx_destroy(&ps->ps_mtx); 2733 free(ps, M_SUBPROC); 2734 } else 2735 mtx_unlock(&ps->ps_mtx); 2736} 2737 2738struct sigacts * 2739sigacts_hold(struct sigacts *ps) 2740{ 2741 mtx_lock(&ps->ps_mtx); 2742 ps->ps_refcnt++; 2743 mtx_unlock(&ps->ps_mtx); 2744 return (ps); 2745} 2746 2747void 2748sigacts_copy(struct sigacts *dest, struct sigacts *src) 2749{ 2750 2751 KASSERT(dest->ps_refcnt == 1, ("sigacts_copy to shared dest")); 2752 mtx_lock(&src->ps_mtx); 2753 bcopy(src, dest, offsetof(struct sigacts, ps_refcnt)); 2754 mtx_unlock(&src->ps_mtx); 2755} 2756 2757int 2758sigacts_shared(struct sigacts *ps) 2759{ 2760 int shared; 2761 2762 mtx_lock(&ps->ps_mtx); 2763 shared = ps->ps_refcnt > 1; 2764 mtx_unlock(&ps->ps_mtx); 2765 return (shared); 2766}
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