signal.h revision 21673
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 21673 1997-01-14 07:20:47Z jkh $ 40 */ 41 42#ifndef _SYS_SIGNAL_H_ 43#define _SYS_SIGNAL_H_ 44 45#include <sys/cdefs.h> 46#include <machine/signal.h> /* sig_atomic_t; trap codes; sigcontext */ 47 48#if !defined(_ANSI_SOURCE) && !defined(_POSIX_SOURCE) 49#define NSIG 32 /* counting 0; could be 33 (mask is 1-32) */ 50#endif 51 52#define SIGHUP 1 /* hangup */ 53#define SIGINT 2 /* interrupt */ 54#define SIGQUIT 3 /* quit */ 55#define SIGILL 4 /* illegal instruction (not reset when caught) */ 56#ifndef _POSIX_SOURCE 57#define SIGTRAP 5 /* trace trap (not reset when caught) */ 58#endif 59#define SIGABRT 6 /* abort() */ 60#ifndef _POSIX_SOURCE 61#define SIGIOT SIGABRT /* compatibility */ 62#define SIGEMT 7 /* EMT instruction */ 63#endif 64#define SIGFPE 8 /* floating point exception */ 65#define SIGKILL 9 /* kill (cannot be caught or ignored) */ 66#ifndef _POSIX_SOURCE 67#define SIGBUS 10 /* bus error */ 68#endif 69#define SIGSEGV 11 /* segmentation violation */ 70#ifndef _POSIX_SOURCE 71#define SIGSYS 12 /* non-existent system call invoked */ 72#endif 73#define SIGPIPE 13 /* write on a pipe with no one to read it */ 74#define SIGALRM 14 /* alarm clock */ 75#define SIGTERM 15 /* software termination signal from kill */ 76#ifndef _POSIX_SOURCE 77#define SIGURG 16 /* urgent condition on IO channel */ 78#endif 79#define SIGSTOP 17 /* sendable stop signal not from tty */ 80#define SIGTSTP 18 /* stop signal from tty */ 81#define SIGCONT 19 /* continue a stopped process */ 82#define SIGCHLD 20 /* to parent on child stop or exit */ 83#define SIGTTIN 21 /* to readers pgrp upon background tty read */ 84#define SIGTTOU 22 /* like TTIN for output if (tp->t_local<OSTOP) */ 85#ifndef _POSIX_SOURCE 86#define SIGIO 23 /* input/output possible signal */ 87#define SIGXCPU 24 /* exceeded CPU time limit */ 88#define SIGXFSZ 25 /* exceeded file size limit */ 89#define SIGVTALRM 26 /* virtual time alarm */ 90#define SIGPROF 27 /* profiling time alarm */ 91#define SIGWINCH 28 /* window size changes */ 92#define SIGINFO 29 /* information request */ 93#endif 94#define SIGUSR1 30 /* user defined signal 1 */ 95#define SIGUSR2 31 /* user defined signal 2 */ 96 97/*- 98 * Type of a signal handling function. 99 * 100 * Language spec sez signal handlers take exactly one arg, even though we 101 * actually supply three. Ugh! 102 * 103 * We don't try to hide the difference by leaving out the args because 104 * that would cause warnings about conformant programs. Nonconformant 105 * programs can avoid the warnings by casting to (__sighandler_t *) or 106 * sig_t before calling signal() or assigning to sa_handler or sv_handler. 107 * 108 * The kernel should reverse the cast before calling the function. It 109 * has no way to do this, but on most machines 1-arg and 3-arg functions 110 * have the same calling protocol so there is no problem in practice. 111 * A bit in sa_flags could be used to specify the number of args. 112 */ 113typedef void __sighandler_t __P((int)); 114 115#define SIG_DFL ((__sighandler_t *)0) 116#define SIG_IGN ((__sighandler_t *)1) 117#define SIG_ERR ((__sighandler_t *)-1) 118 119#ifndef _ANSI_SOURCE 120typedef unsigned int sigset_t; 121 122/* 123 * Signal vector "template" used in sigaction call. 124 */ 125struct sigaction { 126 __sighandler_t *sa_handler; /* signal handler */ 127 sigset_t sa_mask; /* signal mask to apply */ 128 int sa_flags; /* see signal options below */ 129}; 130#ifndef _POSIX_SOURCE 131#define SA_ONSTACK 0x0001 /* take signal on signal stack */ 132#define SA_RESTART 0x0002 /* restart system call on signal return */ 133#define SA_RESETHAND 0x0004 /* reset to SIG_DFL when taking signal */ 134#define SA_NODEFER 0x0010 /* don't mask the signal we're delivering */ 135#ifdef COMPAT_SUNOS 136#define SA_USERTRAMP 0x0100 /* do not bounce off kernel's sigtramp */ 137#endif 138#endif /* _POSIX_SOURCE */ 139#define SA_NOCLDSTOP 0x0008 /* do not generate SIGCHLD on child stop */ 140 141/* 142 * Flags for sigprocmask: 143 */ 144#define SIG_BLOCK 1 /* block specified signal set */ 145#define SIG_UNBLOCK 2 /* unblock specified signal set */ 146#define SIG_SETMASK 3 /* set specified signal set */ 147 148#ifndef _POSIX_SOURCE 149typedef __sighandler_t *sig_t; /* type of pointer to a signal function */ 150 151/* 152 * Structure used in sigaltstack call. 153 */ 154struct sigaltstack { 155 char *ss_sp; /* signal stack base */ 156 int ss_size; /* signal stack length */ 157 int ss_flags; /* SS_DISABLE and/or SS_ONSTACK */ 158}; 159#define SS_ONSTACK 0x0001 /* take signal on alternate stack */ 160#define SS_DISABLE 0x0004 /* disable taking signals on alternate stack */ 161#define MINSIGSTKSZ 8192 /* minimum allowable stack */ 162#define SIGSTKSZ (MINSIGSTKSZ + 32768) /* recommended stack size */ 163 164/* 165 * 4.3 compatibility: 166 * Signal vector "template" used in sigvec call. 167 */ 168struct sigvec { 169 __sighandler_t *sv_handler; /* signal handler */ 170 int sv_mask; /* signal mask to apply */ 171 int sv_flags; /* see signal options below */ 172}; 173 174#define SV_ONSTACK SA_ONSTACK 175#define SV_INTERRUPT SA_RESTART /* same bit, opposite sense */ 176#define SV_RESETHAND SA_RESETHAND 177#define SV_NODEFER SA_NODEFER 178#define SV_NOCLDSTOP SA_NOCLDSTOP 179#define sv_onstack sv_flags /* isn't compatibility wonderful! */ 180 181/* 182 * Structure used in sigstack call. 183 */ 184struct sigstack { 185 char *ss_sp; /* signal stack pointer */ 186 int ss_onstack; /* current status */ 187}; 188 189/* 190 * Macro for converting signal number to a mask suitable for 191 * sigblock(). 192 */ 193#define sigmask(m) (1 << ((m)-1)) 194 195#define BADSIG SIG_ERR 196 197#endif /* !_POSIX_SOURCE */ 198#endif /* !_ANSI_SOURCE */ 199 200/* 201 * For historical reasons; programs expect signal's return value to be 202 * defined by <sys/signal.h>. 203 */ 204__BEGIN_DECLS 205__sighandler_t *signal __P((int, __sighandler_t *)); 206__END_DECLS 207 208#endif /* !_SYS_SIGNAL_H_ */ 209