signal.h revision 83045
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 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the University of 21 * California, Berkeley and its contributors. 22 * 4. Neither the name of the University nor the names of its contributors 23 * may be used to endorse or promote products derived from this software 24 * without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 36 * SUCH DAMAGE. 37 * 38 * @(#)signal.h 8.4 (Berkeley) 5/4/95 39 * $FreeBSD: head/sys/sys/signal.h 83045 2001-09-05 01:22:14Z obrien $ 40 */ 41 42#ifndef _SYS_SIGNAL_H_ 43#define _SYS_SIGNAL_H_ 44 45#include <sys/cdefs.h> 46#include <sys/_posix.h> 47 48/* 49 * sigset_t macros. 50 */ 51#define _SIG_WORDS 4 52#define _SIG_MAXSIG 128 53#define _SIG_IDX(sig) ((sig) - 1) 54#define _SIG_WORD(sig) (_SIG_IDX(sig) >> 5) 55#define _SIG_BIT(sig) (1 << (_SIG_IDX(sig) & 31)) 56#define _SIG_VALID(sig) ((sig) < _SIG_MAXSIG && (sig) > 0) 57 58/* 59 * System defined signals. 60 */ 61#define SIGHUP 1 /* hangup */ 62#define SIGINT 2 /* interrupt */ 63#define SIGQUIT 3 /* quit */ 64#define SIGILL 4 /* illegal instr. (not reset when caught) */ 65#ifndef _POSIX_SOURCE 66#define SIGTRAP 5 /* trace trap (not reset when caught) */ 67#endif 68#define SIGABRT 6 /* abort() */ 69#ifndef _POSIX_SOURCE 70#define SIGIOT SIGABRT /* compatibility */ 71#define SIGEMT 7 /* EMT instruction */ 72#endif 73#define SIGFPE 8 /* floating point exception */ 74#define SIGKILL 9 /* kill (cannot be caught or ignored) */ 75#ifndef _POSIX_SOURCE 76#define SIGBUS 10 /* bus error */ 77#endif 78#define SIGSEGV 11 /* segmentation violation */ 79#ifndef _POSIX_SOURCE 80#define SIGSYS 12 /* non-existent system call invoked */ 81#endif 82#define SIGPIPE 13 /* write on a pipe with no one to read it */ 83#define SIGALRM 14 /* alarm clock */ 84#define SIGTERM 15 /* software termination signal from kill */ 85#ifndef _POSIX_SOURCE 86#define SIGURG 16 /* urgent condition on IO channel */ 87#endif 88#define SIGSTOP 17 /* sendable stop signal not from tty */ 89#define SIGTSTP 18 /* stop signal from tty */ 90#define SIGCONT 19 /* continue a stopped process */ 91#define SIGCHLD 20 /* to parent on child stop or exit */ 92#define SIGTTIN 21 /* to readers pgrp upon background tty read */ 93#define SIGTTOU 22 /* like TTIN if (tp->t_local<OSTOP) */ 94#ifndef _POSIX_SOURCE 95#define SIGIO 23 /* input/output possible signal */ 96#define SIGXCPU 24 /* exceeded CPU time limit */ 97#define SIGXFSZ 25 /* exceeded file size limit */ 98#define SIGVTALRM 26 /* virtual time alarm */ 99#define SIGPROF 27 /* profiling time alarm */ 100#define SIGWINCH 28 /* window size changes */ 101#define SIGINFO 29 /* information request */ 102#endif 103#define SIGUSR1 30 /* user defined signal 1 */ 104#define SIGUSR2 31 /* user defined signal 2 */ 105 106/*- 107 * Type of a signal handling function. 108 * 109 * Language spec sez signal handlers take exactly one arg, even though we 110 * actually supply three. Ugh! 111 * 112 * We don't try to hide the difference by leaving out the args because 113 * that would cause warnings about conformant programs. Nonconformant 114 * programs can avoid the warnings by casting to (__sighandler_t *) or 115 * sig_t before calling signal() or assigning to sa_handler or sv_handler. 116 * 117 * The kernel should reverse the cast before calling the function. It 118 * has no way to do this, but on most machines 1-arg and 3-arg functions 119 * have the same calling protocol so there is no problem in practice. 120 * A bit in sa_flags could be used to specify the number of args. 121 */ 122typedef void __sighandler_t __P((int)); 123 124#define SIG_DFL ((__sighandler_t *)0) 125#define SIG_IGN ((__sighandler_t *)1) 126#define SIG_ERR ((__sighandler_t *)-1) 127 128#if defined(_P1003_1B_VISIBLE) || defined(_KERNEL) 129union sigval { 130 /* Members as suggested by Annex C of POSIX 1003.1b. */ 131 int sigval_int; 132 void *sigval_ptr; 133}; 134 135struct sigevent { 136 int sigev_notify; /* Notification type */ 137 union { 138 int __sigev_signo; /* Signal number */ 139 int __sigev_notify_kqueue; 140 } __sigev_u; 141 union sigval sigev_value; /* Signal value */ 142}; 143#define sigev_signo __sigev_u.__sigev_signo 144#define sigev_notify_kqueue __sigev_u.__sigev_notify_kqueue 145 146#define SIGEV_NONE 0 /* No async notification */ 147#define SIGEV_SIGNAL 1 /* Generate a queued signal */ 148#define SIGEV_KEVENT 3 /* Generate a kevent */ 149 150typedef struct __siginfo { 151 int si_signo; /* signal number */ 152 int si_errno; /* errno association */ 153 /* 154 * Cause of signal, one of the SI_ macros or signal-specific 155 * values, i.e. one of the FPE_... values for SIGFPE. This 156 * value is equivalent to the second argument to an old-style 157 * FreeBSD signal handler. 158 */ 159 int si_code; /* signal code */ 160 int si_pid; /* sending process */ 161 unsigned int si_uid; /* sender's ruid */ 162 int si_status; /* exit value */ 163 void *si_addr; /* faulting instruction */ 164 union sigval si_value; /* signal value */ 165 long si_band; /* band event for SIGPOLL */ 166 int __spare__[7]; /* gimme some slack */ 167} siginfo_t; 168#endif /* _P1003_1B_VISIBLE */ 169 170typedef struct __sigset { 171 unsigned int __bits[_SIG_WORDS]; 172} sigset_t; 173 174/* 175 * XXX - there are some nasty dependencies on include file order. Now that 176 * sigset_t has been defined we can include the MD header. 177 */ 178#include <machine/signal.h> /* sig_atomic_t; trap codes; sigcontext */ 179 180#if !defined(_ANSI_SOURCE) 181 182struct __siginfo; 183 184/* 185 * Signal vector "template" used in sigaction call. 186 */ 187struct sigaction { 188 union { 189 void (*__sa_handler) __P((int)); 190 void (*__sa_sigaction) __P((int, struct __siginfo *, 191 void *)); 192 } __sigaction_u; /* signal handler */ 193 int sa_flags; /* see signal options below */ 194 sigset_t sa_mask; /* signal mask to apply */ 195}; 196 197/* if SA_SIGINFO is set, sa_sigaction is to be used instead of sa_handler. */ 198#define sa_handler __sigaction_u.__sa_handler 199 200#define SA_NOCLDSTOP 0x0008 /* do not generate SIGCHLD on child stop */ 201 202#if !defined(_POSIX_SOURCE) 203 204#define sa_sigaction __sigaction_u.__sa_sigaction 205 206#define SA_ONSTACK 0x0001 /* take signal on signal stack */ 207#define SA_RESTART 0x0002 /* restart system call on signal return */ 208#define SA_RESETHAND 0x0004 /* reset to SIG_DFL when taking signal */ 209#define SA_NODEFER 0x0010 /* don't mask the signal we're delivering */ 210#define SA_NOCLDWAIT 0x0020 /* don't keep zombies around */ 211#define SA_SIGINFO 0x0040 /* signal handler with SA_SIGINFO args */ 212#ifdef COMPAT_SUNOS 213#define SA_USERTRAMP 0x0100 /* do not bounce off kernel's sigtramp */ 214#endif 215 216#define NSIG 32 /* number of old signals (counting 0) */ 217 218/* POSIX 1003.1b required values. */ 219#define SI_USER 0x10001 220#define SI_QUEUE 0x10002 221#define SI_TIMER 0x10003 222#define SI_ASYNCIO 0x10004 223#define SI_MESGQ 0x10005 224 225/* Additional FreeBSD values. */ 226#define SI_UNDEFINED 0 227 228typedef void __siginfohandler_t __P((int, struct __siginfo *, void *)); 229 230typedef __sighandler_t *sig_t; /* type of pointer to a signal function */ 231 232#ifdef _BSD_SIZE_T_ 233typedef _BSD_SIZE_T_ size_t; 234#undef _BSD_SIZE_T_ 235#endif 236 237/* 238 * Structure used in sigaltstack call. 239 */ 240typedef struct sigaltstack { 241 char *ss_sp; /* signal stack base */ 242 size_t ss_size; /* signal stack length */ 243 int ss_flags; /* SS_DISABLE and/or SS_ONSTACK */ 244} stack_t; 245 246#define SS_ONSTACK 0x0001 /* take signal on alternate stack */ 247#define SS_DISABLE 0x0004 /* disable taking signals on alternate stack */ 248#define SIGSTKSZ (MINSIGSTKSZ + 32768) /* recommended stack size */ 249 250/* Have enough typedefs for this now. XXX */ 251#include <sys/ucontext.h> 252 253/* 254 * 4.3 compatibility: 255 * Signal vector "template" used in sigvec call. 256 */ 257struct sigvec { 258 __sighandler_t *sv_handler; /* signal handler */ 259 int sv_mask; /* signal mask to apply */ 260 int sv_flags; /* see signal options below */ 261}; 262 263#define SV_ONSTACK SA_ONSTACK 264#define SV_INTERRUPT SA_RESTART /* same bit, opposite sense */ 265#define SV_RESETHAND SA_RESETHAND 266#define SV_NODEFER SA_NODEFER 267#define SV_NOCLDSTOP SA_NOCLDSTOP 268#define SV_SIGINFO SA_SIGINFO 269#define sv_onstack sv_flags /* isn't compatibility wonderful! */ 270 271/* 272 * Structure used in sigstack call. 273 */ 274struct sigstack { 275 char *ss_sp; /* signal stack pointer */ 276 int ss_onstack; /* current status */ 277}; 278 279/* 280 * Macro for converting signal number to a mask suitable for 281 * sigblock(). 282 */ 283#define sigmask(m) (1 << ((m)-1)) 284 285#define BADSIG SIG_ERR 286 287#endif /* !_POSIX_SOURCE */ 288 289/* 290 * Flags for sigprocmask: 291 */ 292#define SIG_BLOCK 1 /* block specified signal set */ 293#define SIG_UNBLOCK 2 /* unblock specified signal set */ 294#define SIG_SETMASK 3 /* set specified signal set */ 295 296#endif /* !_ANSI_SOURCE */ 297 298/* 299 * For historical reasons; programs expect signal's return value to be 300 * defined by <sys/signal.h>. 301 */ 302__BEGIN_DECLS 303__sighandler_t *signal __P((int, __sighandler_t *)); 304__END_DECLS 305 306#endif /* !_SYS_SIGNAL_H_ */ 307