signalvar.h revision 97526
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 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * @(#)signalvar.h 8.6 (Berkeley) 2/19/95 34 * $FreeBSD: head/sys/sys/signalvar.h 97526 2002-05-29 23:44:32Z julian $ 35 */ 36 37#ifndef _SYS_SIGNALVAR_H_ 38#define _SYS_SIGNALVAR_H_ 39 40#include <sys/signal.h> 41 42/* 43 * Kernel signal definitions and data structures, 44 * not exported to user programs. 45 */ 46 47/* 48 * Process signal actions and state, needed only within the process 49 * (not necessarily resident). 50 */ 51struct sigacts { 52 sig_t ps_sigact[_SIG_MAXSIG]; /* disposition of signals */ 53 sigset_t ps_catchmask[_SIG_MAXSIG]; /* signals to be blocked */ 54 sigset_t ps_sigonstack; /* signals to take on sigstack */ 55 sigset_t ps_sigintr; /* signals that interrupt syscalls */ 56 sigset_t ps_sigreset; /* signals that reset when caught */ 57 sigset_t ps_signodefer; /* signals not masked while handled */ 58 sigset_t ps_siginfo; /* signals that want SA_SIGINFO args */ 59 sigset_t ps_osigset; /* signals that use osigset_t */ 60 sigset_t ps_usertramp; /* SunOS compat; libc sigtramp XXX */ 61}; 62 63#ifdef _KERNEL 64/* 65 * Compatibility. 66 */ 67typedef struct { 68 struct osigcontext si_sc; 69 int si_signo; 70 int si_code; 71 union sigval si_value; 72} osiginfo_t; 73 74struct osigaction { 75 union { 76 void (*__sa_handler)(int); 77 void (*__sa_sigaction)(int, osiginfo_t *, void *); 78 } __sigaction_u; /* signal handler */ 79 osigset_t sa_mask; /* signal mask to apply */ 80 int sa_flags; /* see signal options below */ 81}; 82 83typedef void __osiginfohandler_t(int, osiginfo_t *, void *); 84#endif /* _KERNEL */ 85 86/* additional signal action values, used only temporarily/internally */ 87#define SIG_CATCH ((__sighandler_t *)2) 88#define SIG_HOLD ((__sighandler_t *)3) 89 90/* 91 * get signal action for process and signal; currently only for current process 92 */ 93#define SIGACTION(p, sig) (p->p_sigacts->ps_sigact[_SIG_IDX(sig)]) 94 95/* 96 * sigset_t manipulation macros 97 */ 98#define SIGADDSET(set, signo) \ 99 (set).__bits[_SIG_WORD(signo)] |= _SIG_BIT(signo) 100 101#define SIGDELSET(set, signo) \ 102 (set).__bits[_SIG_WORD(signo)] &= ~_SIG_BIT(signo) 103 104#define SIGEMPTYSET(set) \ 105 do { \ 106 int __i; \ 107 for (__i = 0; __i < _SIG_WORDS; __i++) \ 108 (set).__bits[__i] = 0; \ 109 } while (0) 110 111#define SIGFILLSET(set) \ 112 do { \ 113 int __i; \ 114 for (__i = 0; __i < _SIG_WORDS; __i++) \ 115 (set).__bits[__i] = ~0U; \ 116 } while (0) 117 118#define SIGISMEMBER(set, signo) \ 119 ((set).__bits[_SIG_WORD(signo)] & _SIG_BIT(signo)) 120 121#define SIGISEMPTY(set) __sigisempty(&(set)) 122#define SIGNOTEMPTY(set) (!__sigisempty(&(set))) 123 124#define SIGSETEQ(set1, set2) __sigseteq(&(set1), &(set2)) 125#define SIGSETNEQ(set1, set2) (!__sigseteq(&(set1), &(set2))) 126 127#define SIGSETOR(set1, set2) \ 128 do { \ 129 int __i; \ 130 for (__i = 0; __i < _SIG_WORDS; __i++) \ 131 (set1).__bits[__i] |= (set2).__bits[__i]; \ 132 } while (0) 133 134#define SIGSETAND(set1, set2) \ 135 do { \ 136 int __i; \ 137 for (__i = 0; __i < _SIG_WORDS; __i++) \ 138 (set1).__bits[__i] &= (set2).__bits[__i]; \ 139 } while (0) 140 141#define SIGSETNAND(set1, set2) \ 142 do { \ 143 int __i; \ 144 for (__i = 0; __i < _SIG_WORDS; __i++) \ 145 (set1).__bits[__i] &= ~(set2).__bits[__i]; \ 146 } while (0) 147 148#define SIGSETLO(set1, set2) ((set1).__bits[0] = (set2).__bits[0]) 149#define SIGSETOLD(set, oset) ((set).__bits[0] = (oset)) 150 151#define SIG_CANTMASK(set) \ 152 SIGDELSET(set, SIGKILL), SIGDELSET(set, SIGSTOP) 153 154#define SIG_STOPSIGMASK(set) \ 155 SIGDELSET(set, SIGSTOP), SIGDELSET(set, SIGTSTP), \ 156 SIGDELSET(set, SIGTTIN), SIGDELSET(set, SIGTTOU) 157 158#define SIG_CONTSIGMASK(set) \ 159 SIGDELSET(set, SIGCONT) 160 161#define sigcantmask (sigmask(SIGKILL) | sigmask(SIGSTOP)) 162 163#define SIG2OSIG(sig, osig) osig = (sig).__bits[0] 164#define OSIG2SIG(osig, sig) SIGEMPTYSET(sig); (sig).__bits[0] = osig 165 166static __inline int 167__sigisempty(sigset_t *set) 168{ 169 int i; 170 171 for (i = 0; i < _SIG_WORDS; i++) { 172 if (set->__bits[i]) 173 return (0); 174 } 175 return (1); 176} 177 178static __inline int 179__sigseteq(sigset_t *set1, sigset_t *set2) 180{ 181 int i; 182 183 for (i = 0; i < _SIG_WORDS; i++) { 184 if (set1->__bits[i] != set2->__bits[i]) 185 return (0); 186 } 187 return (1); 188} 189 190#ifdef _KERNEL 191 192/* Return nonzero if process p has an unmasked pending signal. */ 193#define SIGPENDING(p) \ 194 (!SIGISEMPTY((p)->p_siglist) && \ 195 (!sigsetmasked(&(p)->p_siglist, &(p)->p_sigmask) || \ 196 (p)->p_flag & P_TRACED)) 197 198/* 199 * Return the value of the pseudo-expression ((*set & ~*mask) != 0). This 200 * is an optimized version of SIGISEMPTY() on a temporary variable 201 * containing SIGSETNAND(*set, *mask). 202 */ 203static __inline int 204sigsetmasked(sigset_t *set, sigset_t *mask) 205{ 206 int i; 207 208 for (i = 0; i < _SIG_WORDS; i++) { 209 if (set->__bits[i] & ~mask->__bits[i]) 210 return (0); 211 } 212 return (1); 213} 214 215struct pgrp; 216struct thread; 217struct proc; 218struct sigio; 219struct mtx; 220 221extern int sugid_coredump; /* Sysctl variable kern.sugid_coredump */ 222extern struct mtx sigio_lock; 223 224/* 225 * Lock the pointers for a sigio object in the underlying objects of 226 * a file descriptor. 227 */ 228#define SIGIO_LOCK() mtx_lock(&sigio_lock) 229#define SIGIO_TRYLOCK() mtx_trylock(&sigio_lock) 230#define SIGIO_UNLOCK() mtx_unlock(&sigio_lock) 231#define SIGIO_LOCKED() mtx_owned(&sigio_lock) 232#define SIGIO_ASSERT(type) mtx_assert(&sigio_lock, type) 233 234/* 235 * Machine-independent functions: 236 */ 237int cursig(struct proc *p); 238void execsigs(struct proc *p); 239void gsignal(int pgid, int sig); 240int issignal(struct proc *p); 241void killproc(struct proc *p, char *why); 242void pgsigio(struct sigio **, int signum, int checkctty); 243void pgsignal(struct pgrp *pgrp, int sig, int checkctty); 244void postsig(int sig); 245void psignal(struct proc *p, int sig); 246void sigexit(struct thread *td, int signum) __dead2; 247void siginit(struct proc *p); 248void signotify(struct proc *p); 249void trapsignal(struct proc *p, int sig, u_long code); 250 251/* 252 * Machine-dependent functions: 253 */ 254void sendsig(sig_t action, int sig, sigset_t *retmask, u_long code); 255 256#endif /* _KERNEL */ 257 258#endif /* !_SYS_SIGNALVAR_H_ */ 259