signalvar.h revision 198506
1/*- 2 * Copyright (c) 1991, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 4. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * @(#)signalvar.h 8.6 (Berkeley) 2/19/95 30 * $FreeBSD: head/sys/sys/signalvar.h 198506 2009-10-27 10:42:24Z kib $ 31 */ 32 33#ifndef _SYS_SIGNALVAR_H_ 34#define _SYS_SIGNALVAR_H_ 35 36#include <sys/queue.h> 37#include <sys/_lock.h> 38#include <sys/_mutex.h> 39#include <sys/signal.h> 40 41/* 42 * Kernel signal definitions and data structures, 43 * not exported to user programs. 44 */ 45 46/* 47 * Logical process signal actions and state, needed only within the process 48 * The mapping between sigacts and proc structures is 1:1 except for rfork() 49 * processes masquerading as threads which use one structure for the whole 50 * group. All members are locked by the included mutex. The reference count 51 * and mutex must be last for the bcopy in sigacts_copy() to work. 52 */ 53struct sigacts { 54 sig_t ps_sigact[_SIG_MAXSIG]; /* Disposition of signals. */ 55 sigset_t ps_catchmask[_SIG_MAXSIG]; /* Signals to be blocked. */ 56 sigset_t ps_sigonstack; /* Signals to take on sigstack. */ 57 sigset_t ps_sigintr; /* Signals that interrupt syscalls. */ 58 sigset_t ps_sigreset; /* Signals that reset when caught. */ 59 sigset_t ps_signodefer; /* Signals not masked while handled. */ 60 sigset_t ps_siginfo; /* Signals that want SA_SIGINFO args. */ 61 sigset_t ps_sigignore; /* Signals being ignored. */ 62 sigset_t ps_sigcatch; /* Signals being caught by user. */ 63 sigset_t ps_freebsd4; /* signals using freebsd4 ucontext. */ 64 sigset_t ps_osigset; /* Signals using <= 3.x osigset_t. */ 65 sigset_t ps_usertramp; /* SunOS compat; libc sigtramp. XXX */ 66 int ps_flag; 67 int ps_refcnt; 68 struct mtx ps_mtx; 69}; 70 71#define PS_NOCLDWAIT 0x0001 /* No zombies if child dies */ 72#define PS_NOCLDSTOP 0x0002 /* No SIGCHLD when children stop. */ 73#define PS_CLDSIGIGN 0x0004 /* The SIGCHLD handler is SIG_IGN. */ 74 75#if defined(_KERNEL) && defined(COMPAT_43) 76/* 77 * Compatibility. 78 */ 79typedef struct { 80 struct osigcontext si_sc; 81 int si_signo; 82 int si_code; 83 union sigval si_value; 84} osiginfo_t; 85 86struct osigaction { 87 union { 88 void (*__sa_handler)(int); 89 void (*__sa_sigaction)(int, osiginfo_t *, void *); 90 } __sigaction_u; /* signal handler */ 91 osigset_t sa_mask; /* signal mask to apply */ 92 int sa_flags; /* see signal options below */ 93}; 94 95typedef void __osiginfohandler_t(int, osiginfo_t *, void *); 96#endif /* _KERNEL && COMPAT_43 */ 97 98/* additional signal action values, used only temporarily/internally */ 99#define SIG_CATCH ((__sighandler_t *)2) 100#define SIG_HOLD ((__sighandler_t *)3) 101 102/* 103 * get signal action for process and signal; currently only for current process 104 */ 105#define SIGACTION(p, sig) (p->p_sigacts->ps_sigact[_SIG_IDX(sig)]) 106 107/* 108 * sigset_t manipulation macros 109 */ 110#define SIGADDSET(set, signo) \ 111 ((set).__bits[_SIG_WORD(signo)] |= _SIG_BIT(signo)) 112 113#define SIGDELSET(set, signo) \ 114 ((set).__bits[_SIG_WORD(signo)] &= ~_SIG_BIT(signo)) 115 116#define SIGEMPTYSET(set) \ 117 do { \ 118 int __i; \ 119 for (__i = 0; __i < _SIG_WORDS; __i++) \ 120 (set).__bits[__i] = 0; \ 121 } while (0) 122 123#define SIGFILLSET(set) \ 124 do { \ 125 int __i; \ 126 for (__i = 0; __i < _SIG_WORDS; __i++) \ 127 (set).__bits[__i] = ~0U; \ 128 } while (0) 129 130#define SIGISMEMBER(set, signo) \ 131 ((set).__bits[_SIG_WORD(signo)] & _SIG_BIT(signo)) 132 133#define SIGISEMPTY(set) (__sigisempty(&(set))) 134#define SIGNOTEMPTY(set) (!__sigisempty(&(set))) 135 136#define SIGSETEQ(set1, set2) (__sigseteq(&(set1), &(set2))) 137#define SIGSETNEQ(set1, set2) (!__sigseteq(&(set1), &(set2))) 138 139#define SIGSETOR(set1, set2) \ 140 do { \ 141 int __i; \ 142 for (__i = 0; __i < _SIG_WORDS; __i++) \ 143 (set1).__bits[__i] |= (set2).__bits[__i]; \ 144 } while (0) 145 146#define SIGSETAND(set1, set2) \ 147 do { \ 148 int __i; \ 149 for (__i = 0; __i < _SIG_WORDS; __i++) \ 150 (set1).__bits[__i] &= (set2).__bits[__i]; \ 151 } while (0) 152 153#define SIGSETNAND(set1, set2) \ 154 do { \ 155 int __i; \ 156 for (__i = 0; __i < _SIG_WORDS; __i++) \ 157 (set1).__bits[__i] &= ~(set2).__bits[__i]; \ 158 } while (0) 159 160#define SIGSETLO(set1, set2) ((set1).__bits[0] = (set2).__bits[0]) 161#define SIGSETOLD(set, oset) ((set).__bits[0] = (oset)) 162 163#define SIG_CANTMASK(set) \ 164 SIGDELSET(set, SIGKILL), SIGDELSET(set, SIGSTOP) 165 166#define SIG_STOPSIGMASK(set) \ 167 SIGDELSET(set, SIGSTOP), SIGDELSET(set, SIGTSTP), \ 168 SIGDELSET(set, SIGTTIN), SIGDELSET(set, SIGTTOU) 169 170#define SIG_CONTSIGMASK(set) \ 171 SIGDELSET(set, SIGCONT) 172 173#define sigcantmask (sigmask(SIGKILL) | sigmask(SIGSTOP)) 174 175#define SIG2OSIG(sig, osig) (osig = (sig).__bits[0]) 176#define OSIG2SIG(osig, sig) SIGEMPTYSET(sig); (sig).__bits[0] = osig 177 178static __inline int 179__sigisempty(sigset_t *set) 180{ 181 int i; 182 183 for (i = 0; i < _SIG_WORDS; i++) { 184 if (set->__bits[i]) 185 return (0); 186 } 187 return (1); 188} 189 190static __inline int 191__sigseteq(sigset_t *set1, sigset_t *set2) 192{ 193 int i; 194 195 for (i = 0; i < _SIG_WORDS; i++) { 196 if (set1->__bits[i] != set2->__bits[i]) 197 return (0); 198 } 199 return (1); 200} 201 202struct osigevent { 203 int sigev_notify; /* Notification type */ 204 union { 205 int __sigev_signo; /* Signal number */ 206 int __sigev_notify_kqueue; 207 } __sigev_u; 208 union sigval sigev_value; /* Signal value */ 209}; 210 211typedef struct ksiginfo { 212 TAILQ_ENTRY(ksiginfo) ksi_link; 213 siginfo_t ksi_info; 214 int ksi_flags; 215 struct sigqueue *ksi_sigq; 216} ksiginfo_t; 217 218#define ksi_signo ksi_info.si_signo 219#define ksi_errno ksi_info.si_errno 220#define ksi_code ksi_info.si_code 221#define ksi_pid ksi_info.si_pid 222#define ksi_uid ksi_info.si_uid 223#define ksi_status ksi_info.si_status 224#define ksi_addr ksi_info.si_addr 225#define ksi_value ksi_info.si_value 226#define ksi_band ksi_info.si_band 227#define ksi_trapno ksi_info.si_trapno 228#define ksi_overrun ksi_info.si_overrun 229#define ksi_timerid ksi_info.si_timerid 230#define ksi_mqd ksi_info.si_mqd 231 232/* bits for ksi_flags */ 233#define KSI_TRAP 0x01 /* Generated by trap. */ 234#define KSI_EXT 0x02 /* Externally managed ksi. */ 235#define KSI_INS 0x04 /* Directly insert ksi, not the copy */ 236#define KSI_COPYMASK KSI_TRAP 237 238#define KSI_ONQ(ksi) ((ksi)->ksi_sigq != NULL) 239 240typedef struct sigqueue { 241 sigset_t sq_signals; /* All pending signals. */ 242 sigset_t sq_kill; /* Legacy depth 1 queue. */ 243 TAILQ_HEAD(, ksiginfo) sq_list;/* Queued signal info. */ 244 struct proc *sq_proc; 245 int sq_flags; 246} sigqueue_t; 247 248/* Flags for ksi_flags */ 249#define SQ_INIT 0x01 250 251#ifdef _KERNEL 252 253/* Return nonzero if process p has an unmasked pending signal. */ 254#define SIGPENDING(td) \ 255 ((!SIGISEMPTY((td)->td_siglist) && \ 256 !sigsetmasked(&(td)->td_siglist, &(td)->td_sigmask)) || \ 257 (!SIGISEMPTY((td)->td_proc->p_siglist) && \ 258 !sigsetmasked(&(td)->td_proc->p_siglist, &(td)->td_sigmask))) 259/* 260 * Return the value of the pseudo-expression ((*set & ~*mask) != 0). This 261 * is an optimized version of SIGISEMPTY() on a temporary variable 262 * containing SIGSETNAND(*set, *mask). 263 */ 264static __inline int 265sigsetmasked(sigset_t *set, sigset_t *mask) 266{ 267 int i; 268 269 for (i = 0; i < _SIG_WORDS; i++) { 270 if (set->__bits[i] & ~mask->__bits[i]) 271 return (0); 272 } 273 return (1); 274} 275 276#define ksiginfo_init(ksi) \ 277do { \ 278 bzero(ksi, sizeof(ksiginfo_t)); \ 279} while(0) 280 281#define ksiginfo_init_trap(ksi) \ 282do { \ 283 ksiginfo_t *kp = ksi; \ 284 bzero(kp, sizeof(ksiginfo_t)); \ 285 kp->ksi_flags |= KSI_TRAP; \ 286} while(0) 287 288static __inline void 289ksiginfo_copy(ksiginfo_t *src, ksiginfo_t *dst) 290{ 291 (dst)->ksi_info = src->ksi_info; 292 (dst)->ksi_flags = (src->ksi_flags & KSI_COPYMASK); 293} 294 295struct pgrp; 296struct thread; 297struct proc; 298struct sigio; 299struct mtx; 300 301extern int sugid_coredump; /* Sysctl variable kern.sugid_coredump */ 302extern struct mtx sigio_lock; 303extern int kern_logsigexit; /* Sysctl variable kern.logsigexit */ 304 305/* 306 * Lock the pointers for a sigio object in the underlying objects of 307 * a file descriptor. 308 */ 309#define SIGIO_LOCK() mtx_lock(&sigio_lock) 310#define SIGIO_TRYLOCK() mtx_trylock(&sigio_lock) 311#define SIGIO_UNLOCK() mtx_unlock(&sigio_lock) 312#define SIGIO_LOCKED() mtx_owned(&sigio_lock) 313#define SIGIO_ASSERT(type) mtx_assert(&sigio_lock, type) 314 315/* stop_allowed parameter for cursig */ 316#define SIG_STOP_ALLOWED 100 317#define SIG_STOP_NOT_ALLOWED 101 318 319/* flags for kern_sigprocmask */ 320#define SIGPROCMASK_OLD 0x0001 321#define SIGPROCMASK_PROC_LOCKED 0x0002 322 323/* 324 * Machine-independent functions: 325 */ 326int cursig(struct thread *td, int stop_allowed); 327void execsigs(struct proc *p); 328void gsignal(int pgid, int sig); 329void killproc(struct proc *p, char *why); 330void pgsigio(struct sigio **, int signum, int checkctty); 331void pgsignal(struct pgrp *pgrp, int sig, int checkctty); 332void postsig(int sig); 333void psignal(struct proc *p, int sig); 334int psignal_event(struct proc *p, struct sigevent *, ksiginfo_t *); 335struct sigacts *sigacts_alloc(void); 336void sigacts_copy(struct sigacts *dest, struct sigacts *src); 337void sigacts_free(struct sigacts *ps); 338struct sigacts *sigacts_hold(struct sigacts *ps); 339int sigacts_shared(struct sigacts *ps); 340void sigexit(struct thread *td, int signum) __dead2; 341int sig_ffs(sigset_t *set); 342void siginit(struct proc *p); 343void signotify(struct thread *td); 344void tdsigcleanup(struct thread *td); 345int tdsignal(struct proc *p, struct thread *td, int sig, 346 ksiginfo_t *ksi); 347void trapsignal(struct thread *td, ksiginfo_t *); 348int ptracestop(struct thread *td, int sig); 349ksiginfo_t * ksiginfo_alloc(int); 350void ksiginfo_free(ksiginfo_t *); 351void sigqueue_init(struct sigqueue *queue, struct proc *p); 352void sigqueue_flush(struct sigqueue *queue); 353void sigqueue_delete_proc(struct proc *p, int sig); 354void sigqueue_delete_set(struct sigqueue *queue, sigset_t *set); 355void sigqueue_delete(struct sigqueue *queue, int sig); 356void sigqueue_move_set(struct sigqueue *src, sigqueue_t *dst, sigset_t *); 357int sigqueue_get(struct sigqueue *queue, int sig, ksiginfo_t *info); 358int sigqueue_add(struct sigqueue *queue, int sig, ksiginfo_t *info); 359void sigqueue_collect_set(struct sigqueue *queue, sigset_t *set); 360void sigqueue_move(struct sigqueue *, struct sigqueue *, int sig); 361void sigqueue_delete_set_proc(struct proc *, sigset_t *); 362void sigqueue_delete_stopmask_proc(struct proc *); 363void sigqueue_take(ksiginfo_t *ksi); 364int kern_sigtimedwait(struct thread *, sigset_t, 365 ksiginfo_t *, struct timespec *); 366int kern_sigprocmask(struct thread *td, int how, 367 sigset_t *set, sigset_t *oset, int flags); 368/* 369 * Machine-dependent functions: 370 */ 371void sendsig(sig_t, ksiginfo_t *, sigset_t *retmask); 372 373#endif /* _KERNEL */ 374 375#endif /* !_SYS_SIGNALVAR_H_ */ 376