signal.h revision 51791
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 51791 1999-09-29 15:03:48Z marcel $ 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 <sys/types.h> 48#include <machine/signal.h> /* sig_atomic_t; trap codes; sigcontext */ 49 50/* 51 * sigset_t macros 52 */ 53#define _SIG_WORDS 4 54#define _SIG_MAXSIG 128 55#define _SIG_IDX(sig) ((sig) - 1) 56#define _SIG_WORD(sig) (_SIG_IDX(sig) >> 5) 57#define _SIG_BIT(sig) (1 << (_SIG_IDX(sig) & 31)) 58 59/* 60 * system defined signals 61 */ 62#define SIGHUP 1 /* hangup */ 63#define SIGINT 2 /* interrupt */ 64#define SIGQUIT 3 /* quit */ 65#define SIGILL 4 /* illegal instr. (not reset when caught) */ 66#ifndef _POSIX_SOURCE 67#define SIGTRAP 5 /* trace trap (not reset when caught) */ 68#endif 69#define SIGABRT 6 /* abort() */ 70#ifndef _POSIX_SOURCE 71#define SIGIOT SIGABRT /* compatibility */ 72#define SIGEMT 7 /* EMT instruction */ 73#endif 74#define SIGFPE 8 /* floating point exception */ 75#define SIGKILL 9 /* kill (cannot be caught or ignored) */ 76#ifndef _POSIX_SOURCE 77#define SIGBUS 10 /* bus error */ 78#endif 79#define SIGSEGV 11 /* segmentation violation */ 80#ifndef _POSIX_SOURCE 81#define SIGSYS 12 /* non-existent system call invoked */ 82#endif 83#define SIGPIPE 13 /* write on a pipe with no one to read it */ 84#define SIGALRM 14 /* alarm clock */ 85#define SIGTERM 15 /* software termination signal from kill */ 86#ifndef _POSIX_SOURCE 87#define SIGURG 16 /* urgent condition on IO channel */ 88#endif 89#define SIGSTOP 17 /* sendable stop signal not from tty */ 90#define SIGTSTP 18 /* stop signal from tty */ 91#define SIGCONT 19 /* continue a stopped process */ 92#define SIGCHLD 20 /* to parent on child stop or exit */ 93#define SIGTTIN 21 /* to readers pgrp upon background tty read */ 94#define SIGTTOU 22 /* like TTIN if (tp->t_local<OSTOP) */ 95#ifndef _POSIX_SOURCE 96#define SIGIO 23 /* input/output possible signal */ 97#define SIGXCPU 24 /* exceeded CPU time limit */ 98#define SIGXFSZ 25 /* exceeded file size limit */ 99#define SIGVTALRM 26 /* virtual time alarm */ 100#define SIGPROF 27 /* profiling time alarm */ 101#define SIGWINCH 28 /* window size changes */ 102#define SIGINFO 29 /* information request */ 103#endif 104#define SIGUSR1 30 /* user defined signal 1 */ 105#define SIGUSR2 31 /* user defined signal 2 */ 106 107/*- 108 * Type of a signal handling function. 109 * 110 * Language spec sez signal handlers take exactly one arg, even though we 111 * actually supply three. Ugh! 112 * 113 * We don't try to hide the difference by leaving out the args because 114 * that would cause warnings about conformant programs. Nonconformant 115 * programs can avoid the warnings by casting to (__sighandler_t *) or 116 * sig_t before calling signal() or assigning to sa_handler or sv_handler. 117 * 118 * The kernel should reverse the cast before calling the function. It 119 * has no way to do this, but on most machines 1-arg and 3-arg functions 120 * have the same calling protocol so there is no problem in practice. 121 * A bit in sa_flags could be used to specify the number of args. 122 */ 123typedef void __sighandler_t __P((int)); 124 125#define SIG_DFL ((__sighandler_t *)0) 126#define SIG_IGN ((__sighandler_t *)1) 127#define SIG_HOLD ((__sighandler_t *)2) 128#define SIG_ERR ((__sighandler_t *)-1) 129 130union sigval { 131 /* Members as suggested by Annex C of POSIX 1003.1b. */ 132 int sigval_int; 133 void *sigval_ptr; 134}; 135 136typedef struct { 137 int si_signo; /* signal number */ 138 int si_errno; /* errno association */ 139 /* 140 * Cause of signal, one of the SI_ macros or signal-specific 141 * values, i.e. one of the FPE_... values for SIGFPE. This 142 * value is equivalent to the second argument to an old-style 143 * FreeBSD signal handler. 144 */ 145 int si_code; /* signal code */ 146 pid_t si_pid; /* sending process */ 147 uid_t si_uid; /* sender's ruid */ 148 int si_status; /* exit value */ 149 void *si_addr; /* faulting instruction */ 150 union sigval si_value; /* signal value */ 151 long si_band; /* band event for SIGPOLL */ 152 int __spare__[7]; /* gimme some slack */ 153} siginfo_t; 154 155typedef struct { 156 unsigned int __bits[_SIG_WORDS]; 157} sigset_t; 158 159#if !defined(_ANSI_SOURCE) 160 161/* 162 * Signal vector "template" used in sigaction call. 163 */ 164struct sigaction { 165 union { 166 void (*__sa_handler) __P((int)); 167 void (*__sa_sigaction) __P((int, siginfo_t *, void *)); 168 } __sigaction_u; /* signal handler */ 169 int sa_flags; /* see signal options below */ 170 sigset_t sa_mask; /* signal mask to apply */ 171}; 172 173/* if SA_SIGINFO is set, sa_sigaction is to be used instead of sa_handler. */ 174#define sa_handler __sigaction_u.__sa_handler 175 176#define SA_NOCLDSTOP 0x0008 /* do not generate SIGCHLD on child stop */ 177 178#if !defined(_POSIX_SOURCE) 179 180#define sa_sigaction __sigaction_u.__sa_sigaction 181 182#define SA_ONSTACK 0x0001 /* take signal on signal stack */ 183#define SA_RESTART 0x0002 /* restart system call on signal return */ 184#define SA_RESETHAND 0x0004 /* reset to SIG_DFL when taking signal */ 185#define SA_NODEFER 0x0010 /* don't mask the signal we're delivering */ 186#define SA_NOCLDWAIT 0x0020 /* don't keep zombies around */ 187#define SA_SIGINFO 0x0040 /* signal handler with SA_SIGINFO args */ 188#ifdef COMPAT_SUNOS 189#define SA_USERTRAMP 0x0100 /* do not bounce off kernel's sigtramp */ 190#endif 191 192#define NSIG 32 193 194/* POSIX 1003.1b required values. */ 195#define SI_USER 0x10001 196#define SI_QUEUE 0x10002 197#define SI_TIMER 0x10003 198#define SI_ASYNCIO 0x10004 199#define SI_MESGQ 0x10005 200 201/* Additional FreeBSD values. */ 202#define SI_UNDEFINED 0 203 204typedef void __siginfohandler_t __P((int, siginfo_t *, void *)); 205 206typedef __sighandler_t *sig_t; /* type of pointer to a signal function */ 207 208#ifdef _BSD_SIZE_T_ 209typedef _BSD_SIZE_T_ size_t; 210#undef _BSD_SIZE_T_ 211#endif 212 213/* 214 * sigaltstack 215 */ 216typedef struct sigaltstack { 217 char *ss_sp; /* signal stack base */ 218 unsigned int ss_size; /* signal stack length */ 219 int ss_flags; /* SS_DISABLE and/or SS_ONSTACK */ 220} stack_t; 221 222#define SS_ONSTACK 0x0001 /* take signal on alternate stack */ 223#define SS_DISABLE 0x0004 /* disable taking signals on alternate stack */ 224#define MINSIGSTKSZ 8192 /* minimum allowable stack */ 225#define SIGSTKSZ (MINSIGSTKSZ + 32768) /* recommended stack size */ 226 227/* 228 * Suck in definition of ucontext_t 229 */ 230#include <sys/ucontext.h> 231 232/* 233 * 4.3 compatibility: 234 * Signal vector "template" used in sigvec call. 235 */ 236struct sigvec { 237 __sighandler_t *sv_handler; /* signal handler */ 238 int sv_mask; /* signal mask to apply */ 239 int sv_flags; /* see signal options below */ 240}; 241 242#define SV_ONSTACK SA_ONSTACK 243#define SV_INTERRUPT SA_RESTART /* same bit, opposite sense */ 244#define SV_RESETHAND SA_RESETHAND 245#define SV_NODEFER SA_NODEFER 246#define SV_NOCLDSTOP SA_NOCLDSTOP 247#define SV_SIGINFO SA_SIGINFO 248#define sv_onstack sv_flags /* isn't compatibility wonderful! */ 249 250/* 251 * Structure used in sigstack call. 252 */ 253struct sigstack { 254 char *ss_sp; /* signal stack pointer */ 255 int ss_onstack; /* current status */ 256}; 257 258/* 259 * Macro for converting signal number to a mask suitable for 260 * sigblock(). 261 */ 262#define sigmask(m) (1 << ((m)-1)) 263 264#define BADSIG SIG_ERR 265 266#endif /* !_POSIX_SOURCE */ 267 268/* 269 * Flags for sigprocmask: 270 */ 271#define SIG_BLOCK 1 /* block specified signal set */ 272#define SIG_UNBLOCK 2 /* unblock specified signal set */ 273#define SIG_SETMASK 3 /* set specified signal set */ 274 275struct sigevent { 276 int sigev_notify; /* Notification type */ 277 int sigev_signo; /* Signal number */ 278 union sigval sigev_value; /* Signal value */ 279}; 280 281#define SIGEV_NONE 0 /* No async notification */ 282#define SIGEV_SIGNAL 1 /* Generate a queued signal */ 283 284#endif /* !_ANSI_SOURCE */ 285 286/* 287 * For historical reasons; programs expect signal's return value to be 288 * defined by <sys/signal.h>. 289 */ 290__BEGIN_DECLS 291__sighandler_t *signal __P((int, __sighandler_t *)); 292__END_DECLS 293 294#endif /* !_SYS_SIGNAL_H_ */ 295