signalvar.h revision 52140
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 52140 1999-10-11 20:33:17Z luoqi $ 35 */ 36 37#ifndef _SYS_SIGNALVAR_H_ /* tmp for user.h */ 38#define _SYS_SIGNALVAR_H_ 39 40#include <sys/signal.h> 41#include <sys/proc.h> 42 43/* 44 * Kernel signal definitions and data structures, 45 * not exported to user programs. 46 */ 47int __sigisempty __P((sigset_t *set)); 48int __sigseteq __P((sigset_t *set1, sigset_t *set2)); 49 50/* 51 * Process signal actions and state, needed only within the process 52 * (not necessarily resident). 53 */ 54struct sigacts { 55 sig_t ps_sigact[_SIG_MAXSIG]; /* disposition of signals */ 56 sigset_t ps_catchmask[_SIG_MAXSIG]; /* signals to be blocked */ 57 sigset_t ps_sigonstack; /* signals to take on sigstack */ 58 sigset_t ps_sigintr; /* signals that interrupt syscalls */ 59 sigset_t ps_sigreset; /* signals that reset when caught */ 60 sigset_t ps_signodefer; /* signals not masked while handled */ 61 sigset_t ps_siginfo; /* signals that want SA_SIGINFO args */ 62 sigset_t ps_osigset; /* signals that use osigset_t */ 63}; 64 65/* 66 * Compatibility 67 */ 68typedef struct { 69 struct osigcontext si_sc; 70 int si_signo; 71 int si_code; 72 union sigval si_value; 73} osiginfo_t; 74 75struct osigaction { 76 union { 77 void (*__sa_handler) __P((int)); 78 void (*__sa_sigaction) __P((int, osiginfo_t *, void *)); 79 } __sigaction_u; /* signal handler */ 80 osigset_t sa_mask; /* signal mask to apply */ 81 int sa_flags; /* see signal options below */ 82}; 83 84typedef void __osiginfohandler_t __P((int, osiginfo_t *, void *)); 85 86/* 87 * additional signal action values, used only temporarily/internally 88 * NOTE: SIG_HOLD was previously internal only, but has been moved to 89 * sys/signal.h 90 */ 91#define SIG_CATCH ((__sighandler_t *)3) 92 93/* 94 * get signal action for process and signal; currently only for current process 95 */ 96#define SIGACTION(p, sig) (p->p_sigacts->ps_sigact[_SIG_IDX(sig)]) 97 98/* 99 * sigset_t manipulation macros 100 */ 101#define SIGADDSET(set, signo) \ 102 (set).__bits[_SIG_WORD(signo)] |= _SIG_BIT(signo) 103 104#define SIGDELSET(set, signo) \ 105 (set).__bits[_SIG_WORD(signo)] &= ~_SIG_BIT(signo) 106 107#define SIGEMPTYSET(set) \ 108 do { \ 109 int __i; \ 110 for (__i = 0; __i < _SIG_WORDS; __i++) \ 111 (set).__bits[__i] = 0; \ 112 } while (0) 113 114#define SIGFILLSET(set) \ 115 do { \ 116 int __i; \ 117 for (__i = 0; __i < _SIG_WORDS; __i++) \ 118 (set).__bits[__i] = ~(unsigned int)0; \ 119 } while (0) 120 121#define SIGISMEMBER(set, signo) \ 122 ((set).__bits[_SIG_WORD(signo)] & _SIG_BIT(signo)) 123 124#define SIGISEMPTY(set) __sigisempty(&(set)) 125#define SIGNOTEMPTY(set) (!__sigisempty(&(set))) 126 127#define SIGSETEQ(set1, set2) __sigseteq(&(set1), &(set2)) 128#define SIGSETNEQ(set1, set2) (!__sigseteq(&(set1), &(set2))) 129 130#define SIGSETOR(set1, set2) \ 131 do { \ 132 int __i; \ 133 for (__i = 0; __i < _SIG_WORDS; __i++) \ 134 (set1).__bits[__i] |= (set2).__bits[__i]; \ 135 } while (0) 136 137#define SIGSETAND(set1, set2) \ 138 do { \ 139 int __i; \ 140 for (__i = 0; __i < _SIG_WORDS; __i++) \ 141 (set1).__bits[__i] &= (set2).__bits[__i]; \ 142 } while (0) 143 144#define SIGSETNAND(set1, set2) \ 145 do { \ 146 int __i; \ 147 for (__i = 0; __i < _SIG_WORDS; __i++) \ 148 (set1).__bits[__i] &= ~(set2).__bits[__i]; \ 149 } while (0) 150 151#define SIGSETLO(set1, set2) ((set1).__bits[0] = (set2).__bits[0]) 152#define SIGSETOLD(set, oset) ((set).__bits[0] = (oset)) 153 154#define SIG_CANTMASK(set) \ 155 SIGDELSET(set, SIGKILL), SIGDELSET(set, SIGSTOP) 156 157#define SIG_STOPSIGMASK(set) \ 158 SIGDELSET(set, SIGSTOP), SIGDELSET(set, SIGTSTP), \ 159 SIGDELSET(set, SIGTTIN), SIGDELSET(set, SIGTTOU) 160 161#define SIG_CONTSIGMASK(set) \ 162 SIGDELSET(set, SIGCONT) 163 164#define sigcantmask (sigmask(SIGKILL) | sigmask(SIGSTOP)) 165 166#define SIG2OSIG(sig, osig) osig = (sig).__bits[0] 167#define OSIG2SIG(osig, sig) SIGEMPTYSET(sig); (sig).__bits[0] = osig 168 169extern __inline int __sigisempty(sigset_t *set) 170{ 171 int i; 172 173 for (i = 0; i < _SIG_WORDS; i++) { 174 if (set->__bits[i]) 175 return (0); 176 } 177 return (1); 178} 179 180extern __inline int __sigseteq(sigset_t *set1, sigset_t *set2) 181{ 182 int i; 183 184 for (i = 0; i < _SIG_WORDS; i++) { 185 if (set1->__bits[i] != set2->__bits[i]) 186 return (0); 187 } 188 return (1); 189} 190 191#ifdef KERNEL 192 193struct pgrp; 194struct proc; 195struct sigio; 196 197extern int sugid_coredump; /* Sysctl variable kern.sugid_coredump */ 198 199/* 200 * Machine-independent functions: 201 */ 202void execsigs __P((struct proc *p)); 203void gsignal __P((int pgid, int sig)); 204int issignal __P((struct proc *p)); 205void killproc __P((struct proc *p, char *why)); 206void pgsigio __P((struct sigio *, int signum, int checkctty)); 207void pgsignal __P((struct pgrp *pgrp, int sig, int checkctty)); 208void postsig __P((int sig)); 209void psignal __P((struct proc *p, int sig)); 210void sigexit __P((struct proc *p, int signum)); 211void siginit __P((struct proc *p)); 212void trapsignal __P((struct proc *p, int sig, u_long code)); 213void check_sigacts __P((void)); 214int __sig_ffs __P((sigset_t *set)); 215int __cursig __P((struct proc *p)); 216 217/* 218 * Machine-dependent functions: 219 */ 220void sendsig __P((sig_t action, int sig, sigset_t *retmask, u_long code)); 221int md_sigreturn __P((struct proc *p, void *sigcntxp, sigset_t *mask)); 222 223/* 224 * Inline functions: 225 */ 226#define CURSIG(p) __cursig(p) 227 228/* 229 * Determine signal that should be delivered to process p, the current 230 * process, 0 if none. If there is a pending stop signal with default 231 * action, the process stops in issignal(). 232 */ 233extern __inline int __cursig(struct proc *p) 234{ 235 sigset_t tmpset; 236 237 tmpset = p->p_siglist; 238 SIGSETNAND(tmpset, p->p_sigmask); 239 return ((SIGISEMPTY(p->p_siglist) || 240 (!(p->p_flag & P_TRACED) && SIGISEMPTY(tmpset))) 241 ? 0 : issignal(p)); 242} 243 244#endif /* KERNEL */ 245 246#endif /* !_SYS_SIGNALVAR_H_ */ 247