1/* syssignal.h - System-dependent definitions for signals. 2 Copyright (C) 1993, 1999, 2001, 2002, 2003, 2004, 3 2005, 2006, 2007 Free Software Foundation, Inc. 4 5This file is part of GNU Emacs. 6 7GNU Emacs is free software; you can redistribute it and/or modify 8it under the terms of the GNU General Public License as published by 9the Free Software Foundation; either version 2, or (at your option) 10any later version. 11 12GNU Emacs is distributed in the hope that it will be useful, 13but WITHOUT ANY WARRANTY; without even the implied warranty of 14MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15GNU General Public License for more details. 16 17You should have received a copy of the GNU General Public License 18along with GNU Emacs; see the file COPYING. If not, write to 19the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, 20Boston, MA 02110-1301, USA. */ 21 22extern void init_signals P_ ((void)); 23 24#ifdef HAVE_GTK_AND_PTHREAD 25#include <pthread.h> 26extern pthread_t main_thread; 27#endif 28 29#ifdef POSIX_SIGNALS 30 31/* Don't #include <signal.h>. That header should always be #included 32 before "config.h", because some configuration files (like s/hpux.h) 33 indicate that SIGIO doesn't work by #undef-ing SIGIO. If this file 34 #includes <signal.h>, then that will re-#define SIGIO and confuse 35 things. */ 36 37#define SIGMASKTYPE sigset_t 38 39#define SIGEMPTYMASK (empty_mask) 40#define SIGFULLMASK (full_mask) 41extern sigset_t empty_mask, full_mask; 42 43/* POSIX pretty much destroys any possibility of writing sigmask as a 44 macro in standard C. We always define our own version because the 45 predefined macro in Glibc 2.1 is only provided for compatility for old 46 programs that use int as signal mask type. */ 47#undef sigmask 48#ifdef __GNUC__ 49#define sigmask(SIG) \ 50 ({ \ 51 sigset_t _mask; \ 52 sigemptyset (&_mask); \ 53 sigaddset (&_mask, SIG); \ 54 _mask; \ 55 }) 56#else /* ! defined (__GNUC__) */ 57extern sigset_t sys_sigmask (); 58#define sigmask(SIG) (sys_sigmask (SIG)) 59#endif /* ! defined (__GNUC__) */ 60 61#undef sigpause 62#define sigpause(MASK) sigsuspend (&(MASK)) 63 64#define sigblock(SIG) sys_sigblock (SIG) 65#define sigunblock(SIG) sys_sigunblock (SIG) 66#ifndef sigsetmask 67#define sigsetmask(SIG) sys_sigsetmask (SIG) 68#endif 69#define sighold(SIG) ONLY_USED_IN_BSD_4_1 70#define sigrelse(SIG) ONLY_USED_IN_BSD_4_1 71#undef signal 72#define signal(SIG,ACT) sys_signal(SIG,ACT) 73 74/* Whether this is what all systems want or not, this is what 75 appears to be assumed in the source, for example data.c:arith_error. */ 76typedef RETSIGTYPE (*signal_handler_t) (/*int*/); 77 78signal_handler_t sys_signal P_ ((int signal_number, signal_handler_t action)); 79sigset_t sys_sigblock P_ ((sigset_t new_mask)); 80sigset_t sys_sigunblock P_ ((sigset_t new_mask)); 81sigset_t sys_sigsetmask P_ ((sigset_t new_mask)); 82 83#define sys_sigdel(MASK,SIG) sigdelset (&MASK,SIG) 84 85#else /* ! defined (POSIX_SIGNALS) */ 86#ifdef USG5_4 87 88extern SIGMASKTYPE sigprocmask_set; 89 90#ifndef sigblock 91#define sigblock(sig) \ 92 (sigprocmask_set = SIGEMPTYMASK | (sig), \ 93 sigprocmask (SIG_BLOCK, &sigprocmask_set, NULL)) 94#endif 95 96#ifndef sigunblock 97#define sigunblock(sig) \ 98 (sigprocmask_set = SIGFULLMASK & ~(sig), \ 99 sigprocmask (SIG_SETMASK, &sigprocmask_set, NULL)) 100#endif 101 102#else 103#ifdef USG 104 105#ifndef sigunblock 106#define sigunblock(sig) 107#endif 108 109#else 110 111#ifndef sigunblock 112#define sigunblock(SIG) \ 113{ SIGMASKTYPE omask = sigblock (SIGEMPTYMASK); sigsetmask (omask & ~SIG); } 114#endif 115 116#endif /* ! defined (USG) */ 117#endif /* ! defined (USG5_4) */ 118#endif /* ! defined (POSIX_SIGNALS) */ 119 120#ifndef SIGMASKTYPE 121#define SIGMASKTYPE int 122#endif 123 124#ifndef SIGEMPTYMASK 125#define SIGEMPTYMASK (0) 126#endif 127 128#ifndef SIGFULLMASK 129#define SIGFULLMASK (0xffffffff) 130#endif 131 132#ifndef sigmask 133#define sigmask(no) (1L << ((no) - 1)) 134#endif 135 136#ifndef sigunblock 137#define sigunblock(SIG) \ 138{ SIGMASKTYPE omask = sigblock (SIGFULLMASK); sigsetmask (omask & ~SIG); } 139#endif 140 141#ifndef BSD4_1 142#define sigfree() sigsetmask (SIGEMPTYMASK) 143#endif /* not BSD4_1 */ 144 145#if defined (SIGINFO) && defined (BROKEN_SIGINFO) 146#undef SIGINFO 147#endif 148#if defined (SIGIO) && defined (BROKEN_SIGIO) 149# undef SIGIO 150# if defined (__Lynx__) 151# undef SIGPOLL /* Defined as SIGIO on LynxOS */ 152# endif 153#endif 154#if defined (SIGPOLL) && defined (BROKEN_SIGPOLL) 155#undef SIGPOLL 156#endif 157#if defined (SIGTSTP) && defined (BROKEN_SIGTSTP) 158#undef SIGTSTP 159#endif 160#if defined (SIGURG) && defined (BROKEN_SIGURG) 161#undef SIGURG 162#endif 163#if defined (SIGAIO) && defined (BROKEN_SIGAIO) 164#undef SIGAIO 165#endif 166#if defined (SIGPTY) && defined (BROKEN_SIGPTY) 167#undef SIGPTY 168#endif 169 170 171#if NSIG < NSIG_MINIMUM 172# ifdef NSIG 173# undef NSIG 174# endif 175# define NSIG NSIG_MINIMUM 176#endif 177 178#ifdef BSD4_1 179#define SIGIO SIGTINT 180/* sigfree is in sysdep.c */ 181#endif /* BSD4_1 */ 182 183/* On bsd, [man says] kill does not accept a negative number to kill a pgrp. 184 Must do that using the killpg call. */ 185#ifdef BSD_SYSTEM 186#define EMACS_KILLPG(gid, signo) (killpg ( (gid), (signo))) 187#else 188#ifdef WINDOWSNT 189#define EMACS_KILLPG(gid, signo) (kill (gid, signo)) 190#else 191#define EMACS_KILLPG(gid, signo) (kill (-(gid), (signo))) 192#endif 193#endif 194 195/* Define SIGCHLD as an alias for SIGCLD. There are many conditionals 196 testing SIGCHLD. */ 197#ifndef VMS 198#ifdef SIGCLD 199#ifndef SIGCHLD 200#define SIGCHLD SIGCLD 201#endif /* SIGCHLD */ 202#endif /* ! defined (SIGCLD) */ 203#endif /* VMS */ 204 205#ifndef HAVE_STRSIGNAL 206/* strsignal is in sysdep.c */ 207char *strsignal (); 208#endif 209 210#ifdef HAVE_GTK_AND_PTHREAD 211#define SIGNAL_THREAD_CHECK(signo) \ 212 do { \ 213 if (!pthread_equal (pthread_self (), main_thread)) \ 214 { \ 215 /* POSIX says any thread can receive the signal. On GNU/Linux \ 216 that is not true, but for other systems (FreeBSD at least) \ 217 it is. So direct the signal to the correct thread and block \ 218 it from this thread. */ \ 219 sigset_t new_mask; \ 220 \ 221 sigemptyset (&new_mask); \ 222 sigaddset (&new_mask, signo); \ 223 pthread_sigmask (SIG_BLOCK, &new_mask, 0); \ 224 pthread_kill (main_thread, signo); \ 225 return; \ 226 } \ 227 } while (0) 228 229#else /* not HAVE_GTK_AND_PTHREAD */ 230#define SIGNAL_THREAD_CHECK(signo) 231#endif /* not HAVE_GTK_AND_PTHREAD */ 232/* arch-tag: 4580e86a-340d-4574-9e11-a742b6e1a152 233 (do not change this comment) */ 234