signal.h revision 48621
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 * $Id: signal.h,v 1.14 1998/08/05 09:04:36 dfr Exp $ 40 */ 41 42#ifndef _SYS_SIGNAL_H_ 43#define _SYS_SIGNAL_H_ 44 45#include <sys/cdefs.h> 46#include <sys/_posix.h> 47#include <machine/signal.h> /* sig_atomic_t; trap codes; sigcontext */ 48 49#if !defined(_ANSI_SOURCE) && !defined(_POSIX_SOURCE) 50#define NSIG 32 /* counting 0; could be 33 (mask is 1-32) */ 51#endif 52 53#define SIGHUP 1 /* hangup */ 54#define SIGINT 2 /* interrupt */ 55#define SIGQUIT 3 /* quit */ 56#define SIGILL 4 /* illegal instruction (not reset when caught) */ 57#ifndef _POSIX_SOURCE 58#define SIGTRAP 5 /* trace trap (not reset when caught) */ 59#endif 60#define SIGABRT 6 /* abort() */ 61#ifndef _POSIX_SOURCE 62#define SIGIOT SIGABRT /* compatibility */ 63#define SIGEMT 7 /* EMT instruction */ 64#endif 65#define SIGFPE 8 /* floating point exception */ 66#define SIGKILL 9 /* kill (cannot be caught or ignored) */ 67#ifndef _POSIX_SOURCE 68#define SIGBUS 10 /* bus error */ 69#endif 70#define SIGSEGV 11 /* segmentation violation */ 71#ifndef _POSIX_SOURCE 72#define SIGSYS 12 /* non-existent system call invoked */ 73#endif 74#define SIGPIPE 13 /* write on a pipe with no one to read it */ 75#define SIGALRM 14 /* alarm clock */ 76#define SIGTERM 15 /* software termination signal from kill */ 77#ifndef _POSIX_SOURCE 78#define SIGURG 16 /* urgent condition on IO channel */ 79#endif 80#define SIGSTOP 17 /* sendable stop signal not from tty */ 81#define SIGTSTP 18 /* stop signal from tty */ 82#define SIGCONT 19 /* continue a stopped process */ 83#define SIGCHLD 20 /* to parent on child stop or exit */ 84#define SIGTTIN 21 /* to readers pgrp upon background tty read */ 85#define SIGTTOU 22 /* like TTIN for output if (tp->t_local<OSTOP) */ 86#ifndef _POSIX_SOURCE 87#define SIGIO 23 /* input/output possible signal */ 88#define SIGXCPU 24 /* exceeded CPU time limit */ 89#define SIGXFSZ 25 /* exceeded file size limit */ 90#define SIGVTALRM 26 /* virtual time alarm */ 91#define SIGPROF 27 /* profiling time alarm */ 92#define SIGWINCH 28 /* window size changes */ 93#define SIGINFO 29 /* information request */ 94#endif 95#define SIGUSR1 30 /* user defined signal 1 */ 96#define SIGUSR2 31 /* user defined signal 2 */ 97 98/*- 99 * Type of a signal handling function. 100 * 101 * Language spec sez signal handlers take exactly one arg, even though we 102 * actually supply three. Ugh! 103 * 104 * We don't try to hide the difference by leaving out the args because 105 * that would cause warnings about conformant programs. Nonconformant 106 * programs can avoid the warnings by casting to (__sighandler_t *) or 107 * sig_t before calling signal() or assigning to sa_handler or sv_handler. 108 * 109 * The kernel should reverse the cast before calling the function. It 110 * has no way to do this, but on most machines 1-arg and 3-arg functions 111 * have the same calling protocol so there is no problem in practice. 112 * A bit in sa_flags could be used to specify the number of args. 113 */ 114typedef void __sighandler_t __P((int)); 115 116#if defined(_P1003_1B_VISIBLE_HISTORICALLY) || \ 117 (!defined(_ANSI_SOURCE) && !defined(_POSIX_SOURCE)) 118union sigval { 119 /* Members as suggested by Annex C of POSIX 1003.1b. */ 120 int sigval_int; 121 void *sigval_ptr; 122}; 123#endif /* !_ANSI_SOURCE && _P1003_1B_VISIBLE_HISTORICALLY */ 124 125#if !defined(_ANSI_SOURCE) && !defined(_POSIX_SOURCE) 126/* POSIX 1003.1b required values. */ 127#define SI_USER 0x10001 128#define SI_QUEUE 0x10002 129#define SI_TIMER 0x10003 130#define SI_ASYNCIO 0x10004 131#define SI_MESGQ 0x10005 132 133/* Additional FreeBSD values. */ 134#define SI_UNDEFINED 0 135 136struct __siginfo { 137 struct sigcontext si_sc; 138 int si_signo; /* signal number */ 139 140 /* 141 * Cause of signal, one of the SI_ macros or signal-specific 142 * values, i.e. one of the FPE_... values for SIGFPE. This 143 * value is equivalent to the second argument to an old-style 144 * FreeBSD signal handler. 145 */ 146 int si_code; 147 148 union sigval si_value; 149}; 150#else /* ! _ANSI_SOURCE && ! _POSIX_SOURCE */ 151struct __siginfo; 152#endif /* ! _ANSI_SOURCE && ! _POSIX_SOURCE */ 153 154typedef struct __siginfo siginfo_t; 155 156#if !defined(_ANSI_SOURCE) && !defined(_POSIX_SOURCE) 157typedef void __siginfohandler_t __P((int, siginfo_t *, void *)); 158#endif /* ! _ANSI_SOURCE && ! _POSIX_SOURCE */ 159 160#define SIG_DFL ((__sighandler_t *)0) 161#define SIG_IGN ((__sighandler_t *)1) 162#define SIG_ERR ((__sighandler_t *)-1) 163 164#ifndef _ANSI_SOURCE 165typedef unsigned int sigset_t; 166 167/* 168 * Signal vector "template" used in sigaction call. 169 */ 170struct sigaction { 171 union { 172 void (*__sa_handler) __P((int)); 173 void (*__sa_sigaction) __P((int, siginfo_t *, void *)); 174 } __sigaction_u; /* signal handler */ 175 sigset_t sa_mask; /* signal mask to apply */ 176 int sa_flags; /* see signal options below */ 177}; 178/* if SA_SIGINFO is set, sa_sigaction is to be used instead of sa_handler. */ 179#define sa_handler __sigaction_u.__sa_handler 180#ifndef _POSIX_SOURCE 181#define sa_sigaction __sigaction_u.__sa_sigaction 182#endif 183 184#ifndef _POSIX_SOURCE 185#define SA_ONSTACK 0x0001 /* take signal on signal stack */ 186#define SA_RESTART 0x0002 /* restart system call on signal return */ 187#define SA_RESETHAND 0x0004 /* reset to SIG_DFL when taking signal */ 188#define SA_NODEFER 0x0010 /* don't mask the signal we're delivering */ 189#define SA_NOCLDWAIT 0x0020 /* don't keep zombies around */ 190#define SA_SIGINFO 0x0040 /* signal handler with SA_SIGINFO args */ 191#ifdef COMPAT_SUNOS 192#define SA_USERTRAMP 0x0100 /* do not bounce off kernel's sigtramp */ 193#endif 194#endif /* _POSIX_SOURCE */ 195#define SA_NOCLDSTOP 0x0008 /* do not generate SIGCHLD on child stop */ 196 197/* 198 * Flags for sigprocmask: 199 */ 200#define SIG_BLOCK 1 /* block specified signal set */ 201#define SIG_UNBLOCK 2 /* unblock specified signal set */ 202#define SIG_SETMASK 3 /* set specified signal set */ 203 204#ifndef _POSIX_SOURCE 205typedef __sighandler_t *sig_t; /* type of pointer to a signal function */ 206 207#ifdef _BSD_SIZE_T_ 208typedef _BSD_SIZE_T_ size_t; 209#undef _BSD_SIZE_T_ 210#endif 211 212/* 213 * Structure used in sigaltstack call. 214 */ 215struct sigaltstack { 216 char *ss_sp; /* signal stack base */ 217 size_t ss_size; /* signal stack length */ 218 int ss_flags; /* SS_DISABLE and/or SS_ONSTACK */ 219}; 220#define SS_ONSTACK 0x0001 /* take signal on alternate stack */ 221#define SS_DISABLE 0x0004 /* disable taking signals on alternate stack */ 222#define MINSIGSTKSZ 8192 /* minimum allowable stack */ 223#define SIGSTKSZ (MINSIGSTKSZ + 32768) /* recommended stack size */ 224 225/* 226 * 4.3 compatibility: 227 * Signal vector "template" used in sigvec call. 228 */ 229struct sigvec { 230 __sighandler_t *sv_handler; /* signal handler */ 231 int sv_mask; /* signal mask to apply */ 232 int sv_flags; /* see signal options below */ 233}; 234 235#define SV_ONSTACK SA_ONSTACK 236#define SV_INTERRUPT SA_RESTART /* same bit, opposite sense */ 237#define SV_RESETHAND SA_RESETHAND 238#define SV_NODEFER SA_NODEFER 239#define SV_NOCLDSTOP SA_NOCLDSTOP 240#define SV_SIGINFO SA_SIGINFO 241#define sv_onstack sv_flags /* isn't compatibility wonderful! */ 242 243/* 244 * Structure used in sigstack call. 245 */ 246struct sigstack { 247 char *ss_sp; /* signal stack pointer */ 248 int ss_onstack; /* current status */ 249}; 250 251/* 252 * Macro for converting signal number to a mask suitable for 253 * sigblock(). 254 */ 255#define sigmask(m) (1 << ((m)-1)) 256 257#define BADSIG SIG_ERR 258 259#endif /* !_POSIX_SOURCE */ 260#endif /* !_ANSI_SOURCE */ 261 262#if !defined(_ANSI_SOURCE) && defined(_P1003_1B_VISIBLE_HISTORICALLY) 263 264struct sigevent { 265 int sigev_notify; /* Notification type */ 266 int sigev_signo; /* Signal number */ 267 union sigval sigev_value; /* Signal value */ 268}; 269 270#define SIGEV_NONE 0 /* No async notification */ 271#define SIGEV_SIGNAL 1 /* Generate a queued signal */ 272 273#endif /* ! _ANSI_SOURCE && _P1003_1B_VISIBLE_HISTORICALLY */ 274 275/* 276 * For historical reasons; programs expect signal's return value to be 277 * defined by <sys/signal.h>. 278 */ 279__BEGIN_DECLS 280__sighandler_t *signal __P((int, __sighandler_t *)); 281__END_DECLS 282 283#endif /* !_SYS_SIGNAL_H_ */ 284