signalvar.h revision 51791
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 51791 1999-09-29 15:03:48Z marcel $ 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 int ps_flags; /* signal flags, below */ 63 stack_t ps_sigstk; /* sp & on stack state variable */ 64 sigset_t ps_usertramp; /* SunOS compat; libc sigtramp XXX */ 65}; 66 67/* signal flags */ 68#define SAS_OLDMASK 0x01 /* need to restore mask before pause */ 69#define SAS_ALTSTACK 0x02 /* have alternate signal stack */ 70 71/* 72 * Compatibility 73 */ 74typedef struct { 75 struct osigcontext si_sc; 76 int si_signo; 77 int si_code; 78 union sigval si_value; 79} osiginfo_t; 80 81struct osigaction { 82 union { 83 void (*__sa_handler) __P((int)); 84 void (*__sa_sigaction) __P((int, osiginfo_t *, void *)); 85 } __sigaction_u; /* signal handler */ 86 osigset_t sa_mask; /* signal mask to apply */ 87 int sa_flags; /* see signal options below */ 88}; 89 90typedef void __osiginfohandler_t __P((int, osiginfo_t *, void *)); 91 92/* 93 * additional signal action values, used only temporarily/internally 94 * NOTE: SIG_HOLD was previously internal only, but has been moved to 95 * sys/signal.h 96 */ 97#define SIG_CATCH ((__sighandler_t *)3) 98 99/* 100 * get signal action for process and signal; currently only for current process 101 */ 102#define SIGACTION(p, sig) (p->p_sigacts->ps_sigact[_SIG_IDX(sig)]) 103 104/* 105 * sigset_t manipulation macros 106 */ 107#define SIGADDSET(set, signo) \ 108 (set).__bits[_SIG_WORD(signo)] |= _SIG_BIT(signo) 109 110#define SIGDELSET(set, signo) \ 111 (set).__bits[_SIG_WORD(signo)] &= ~_SIG_BIT(signo) 112 113#define SIGEMPTYSET(set) \ 114 do { \ 115 int __i; \ 116 for (__i = 0; __i < _SIG_WORDS; __i++) \ 117 (set).__bits[__i] = 0; \ 118 } while (0) 119 120#define SIGFILLSET(set) \ 121 do { \ 122 int __i; \ 123 for (__i = 0; __i < _SIG_WORDS; __i++) \ 124 (set).__bits[__i] = ~(unsigned int)0; \ 125 } while (0) 126 127#define SIGISMEMBER(set, signo) \ 128 ((set).__bits[_SIG_WORD(signo)] & _SIG_BIT(signo)) 129 130#define SIGISEMPTY(set) __sigisempty(&(set)) 131#define SIGNOTEMPTY(set) (!__sigisempty(&(set))) 132 133#define SIGSETEQ(set1, set2) __sigseteq(&(set1), &(set2)) 134#define SIGSETNEQ(set1, set2) (!__sigseteq(&(set1), &(set2))) 135 136#define SIGSETOR(set1, set2) \ 137 do { \ 138 int __i; \ 139 for (__i = 0; __i < _SIG_WORDS; __i++) \ 140 (set1).__bits[__i] |= (set2).__bits[__i]; \ 141 } while (0) 142 143#define SIGSETAND(set1, set2) \ 144 do { \ 145 int __i; \ 146 for (__i = 0; __i < _SIG_WORDS; __i++) \ 147 (set1).__bits[__i] &= (set2).__bits[__i]; \ 148 } while (0) 149 150#define SIGSETNAND(set1, set2) \ 151 do { \ 152 int __i; \ 153 for (__i = 0; __i < _SIG_WORDS; __i++) \ 154 (set1).__bits[__i] &= ~(set2).__bits[__i]; \ 155 } while (0) 156 157#define SIG_CANTMASK(set) \ 158 SIGDELSET(set, SIGKILL), SIGDELSET(set, SIGSTOP) 159 160#define SIG_STOPSIGMASK(set) \ 161 SIGDELSET(set, SIGSTOP), SIGDELSET(set, SIGTSTP), \ 162 SIGDELSET(set, SIGTTIN), SIGDELSET(set, SIGTTOU) 163 164#define SIG_CONTSIGMASK(set) \ 165 SIGDELSET(set, SIGCONT) 166 167#define sigcantmask (sigmask(SIGKILL) | sigmask(SIGSTOP)) 168 169#define SIG2OSIG(sig, osig) osig = (sig).__bits[0] 170#define OSIG2SIG(osig, sig) SIGEMPTYSET(sig); (sig).__bits[0] = osig 171 172extern __inline int __sigisempty(sigset_t *set) 173{ 174 int i; 175 176 for (i = 0; i < _SIG_WORDS; i++) { 177 if (set->__bits[i]) 178 return (0); 179 } 180 return (1); 181} 182 183extern __inline int __sigseteq(sigset_t *set1, sigset_t *set2) 184{ 185 int i; 186 187 for (i = 0; i < _SIG_WORDS; i++) { 188 if (set1->__bits[i] != set2->__bits[i]) 189 return (0); 190 } 191 return (1); 192} 193 194#ifdef KERNEL 195 196struct pgrp; 197struct proc; 198struct sigio; 199 200extern int sugid_coredump; /* Sysctl variable kern.sugid_coredump */ 201 202/* 203 * Machine-independent functions: 204 */ 205void execsigs __P((struct proc *p)); 206void gsignal __P((int pgid, int sig)); 207int issignal __P((struct proc *p)); 208void killproc __P((struct proc *p, char *why)); 209void pgsigio __P((struct sigio *, int signum, int checkctty)); 210void pgsignal __P((struct pgrp *pgrp, int sig, int checkctty)); 211void postsig __P((int sig)); 212void psignal __P((struct proc *p, int sig)); 213void sigexit __P((struct proc *p, int signum)); 214void siginit __P((struct proc *p)); 215void trapsignal __P((struct proc *p, int sig, u_long code)); 216void check_sigacts __P((void)); 217int __sig_ffs __P((sigset_t *set)); 218int __cursig __P((struct proc *p)); 219 220/* 221 * Machine-dependent functions: 222 */ 223void sendsig __P((sig_t action, int sig, sigset_t *retmask, u_long code)); 224int md_sigreturn __P((struct proc *p, void *sigcntxp, sigset_t *mask)); 225 226/* 227 * Inline functions: 228 */ 229#define CURSIG(p) __cursig(p) 230 231/* 232 * Determine signal that should be delivered to process p, the current 233 * process, 0 if none. If there is a pending stop signal with default 234 * action, the process stops in issignal(). 235 */ 236extern __inline int __cursig(struct proc *p) 237{ 238 sigset_t tmpset; 239 240 tmpset = p->p_siglist; 241 SIGSETNAND(tmpset, p->p_sigmask); 242 return ((SIGISEMPTY(p->p_siglist) || 243 (!(p->p_flag & P_TRACED) && SIGISEMPTY(tmpset))) 244 ? 0 : issignal(p)); 245} 246 247#endif /* KERNEL */ 248 249#endif /* !_SYS_SIGNALVAR_H_ */ 250