| 1 | /* syssignal.h - System-dependent definitions for signals. |
| 2 | Copyright (C) 1993, 1999, 2001, 2002, 2003, 2004, |
| 3 | 2005, 2006, 2007, 2008 Free Software Foundation, Inc. |
| 4 | |
| 5 | This file is part of GNU Emacs. |
| 6 | |
| 7 | GNU Emacs is free software; you can redistribute it and/or modify |
| 8 | it under the terms of the GNU General Public License as published by |
| 9 | the Free Software Foundation; either version 3, or (at your option) |
| 10 | any later version. |
| 11 | |
| 12 | GNU Emacs is distributed in the hope that it will be useful, |
| 13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | GNU General Public License for more details. |
| 16 | |
| 17 | You should have received a copy of the GNU General Public License |
| 18 | along with GNU Emacs; see the file COPYING. If not, write to |
| 19 | the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, |
| 20 | Boston, MA 02110-1301, USA. */ |
| 21 | |
| 22 | extern void init_signals P_ ((void)); |
| 23 | |
| 24 | #ifdef HAVE_GTK_AND_PTHREAD |
| 25 | #include <pthread.h> |
| 26 | extern 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 | /* XXX This is not correct anymore, there is a BROKEN_SIGIO macro. */ |
| 37 | |
| 38 | #define SIGMASKTYPE sigset_t |
| 39 | |
| 40 | #define SIGEMPTYMASK (empty_mask) |
| 41 | #define SIGFULLMASK (full_mask) |
| 42 | extern sigset_t empty_mask, full_mask; |
| 43 | |
| 44 | /* POSIX pretty much destroys any possibility of writing sigmask as a |
| 45 | macro in standard C. We always define our own version because the |
| 46 | predefined macro in Glibc 2.1 is only provided for compatility for old |
| 47 | programs that use int as signal mask type. */ |
| 48 | #undef sigmask |
| 49 | #ifdef __GNUC__ |
| 50 | #define sigmask(SIG) \ |
| 51 | ({ \ |
| 52 | sigset_t _mask; \ |
| 53 | sigemptyset (&_mask); \ |
| 54 | sigaddset (&_mask, SIG); \ |
| 55 | _mask; \ |
| 56 | }) |
| 57 | #else /* ! defined (__GNUC__) */ |
| 58 | extern sigset_t sys_sigmask (); |
| 59 | #define sigmask(SIG) (sys_sigmask (SIG)) |
| 60 | #endif /* ! defined (__GNUC__) */ |
| 61 | |
| 62 | #undef sigpause |
| 63 | #define sigpause(MASK) sigsuspend (&(MASK)) |
| 64 | |
| 65 | #define sigblock(SIG) sys_sigblock (SIG) |
| 66 | #define sigunblock(SIG) sys_sigunblock (SIG) |
| 67 | #ifndef sigsetmask |
| 68 | #define sigsetmask(SIG) sys_sigsetmask (SIG) |
| 69 | #endif |
| 70 | #define sighold(SIG) ONLY_USED_IN_BSD_4_1 |
| 71 | #define sigrelse(SIG) ONLY_USED_IN_BSD_4_1 |
| 72 | #undef signal |
| 73 | #define signal(SIG,ACT) sys_signal(SIG,ACT) |
| 74 | |
| 75 | /* Whether this is what all systems want or not, this is what |
| 76 | appears to be assumed in the source, for example data.c:arith_error. */ |
| 77 | typedef RETSIGTYPE (*signal_handler_t) (/*int*/); |
| 78 | |
| 79 | signal_handler_t sys_signal P_ ((int signal_number, signal_handler_t action)); |
| 80 | sigset_t sys_sigblock P_ ((sigset_t new_mask)); |
| 81 | sigset_t sys_sigunblock P_ ((sigset_t new_mask)); |
| 82 | sigset_t sys_sigsetmask P_ ((sigset_t new_mask)); |
| 83 | |
| 84 | #define sys_sigdel(MASK,SIG) sigdelset (&MASK,SIG) |
| 85 | |
| 86 | #else /* ! defined (POSIX_SIGNALS) */ |
| 87 | #ifdef USG5_4 |
| 88 | |
| 89 | extern SIGMASKTYPE sigprocmask_set; |
| 90 | |
| 91 | #ifndef sigblock |
| 92 | #define sigblock(sig) \ |
| 93 | (sigprocmask_set = SIGEMPTYMASK | (sig), \ |
| 94 | sigprocmask (SIG_BLOCK, &sigprocmask_set, NULL)) |
| 95 | #endif |
| 96 | |
| 97 | #ifndef sigunblock |
| 98 | #define sigunblock(sig) \ |
| 99 | (sigprocmask_set = SIGFULLMASK & ~(sig), \ |
| 100 | sigprocmask (SIG_SETMASK, &sigprocmask_set, NULL)) |
| 101 | #endif |
| 102 | |
| 103 | #else |
| 104 | #ifdef USG |
| 105 | |
| 106 | #ifndef sigunblock |
| 107 | #define sigunblock(sig) |
| 108 | #endif |
| 109 | |
| 110 | #else |
| 111 | |
| 112 | #ifndef sigunblock |
| 113 | #define sigunblock(SIG) \ |
| 114 | { SIGMASKTYPE omask = sigblock (SIGEMPTYMASK); sigsetmask (omask & ~SIG); } |
| 115 | #endif |
| 116 | |
| 117 | #endif /* ! defined (USG) */ |
| 118 | #endif /* ! defined (USG5_4) */ |
| 119 | #endif /* ! defined (POSIX_SIGNALS) */ |
| 120 | |
| 121 | #ifndef SIGMASKTYPE |
| 122 | #define SIGMASKTYPE int |
| 123 | #endif |
| 124 | |
| 125 | #ifndef SIGEMPTYMASK |
| 126 | #define SIGEMPTYMASK (0) |
| 127 | #endif |
| 128 | |
| 129 | #ifndef SIGFULLMASK |
| 130 | #define SIGFULLMASK (0xffffffff) |
| 131 | #endif |
| 132 | |
| 133 | #ifndef sigmask |
| 134 | #define sigmask(no) (1L << ((no) - 1)) |
| 135 | #endif |
| 136 | |
| 137 | #ifndef sigunblock |
| 138 | #define sigunblock(SIG) \ |
| 139 | { SIGMASKTYPE omask = sigblock (SIGFULLMASK); sigsetmask (omask & ~SIG); } |
| 140 | #endif |
| 141 | |
| 142 | #ifndef BSD4_1 |
| 143 | #define sigfree() sigsetmask (SIGEMPTYMASK) |
| 144 | #endif /* not BSD4_1 */ |
| 145 | |
| 146 | #if defined (SIGINFO) && defined (BROKEN_SIGINFO) |
| 147 | #undef SIGINFO |
| 148 | #endif |
| 149 | #if defined (SIGIO) && defined (BROKEN_SIGIO) |
| 150 | # undef SIGIO |
| 151 | # if defined (__Lynx__) |
| 152 | # undef SIGPOLL /* Defined as SIGIO on LynxOS */ |
| 153 | # endif |
| 154 | #endif |
| 155 | #if defined (SIGPOLL) && defined (BROKEN_SIGPOLL) |
| 156 | #undef SIGPOLL |
| 157 | #endif |
| 158 | #if defined (SIGTSTP) && defined (BROKEN_SIGTSTP) |
| 159 | #undef SIGTSTP |
| 160 | #endif |
| 161 | #if defined (SIGURG) && defined (BROKEN_SIGURG) |
| 162 | #undef SIGURG |
| 163 | #endif |
| 164 | #if defined (SIGAIO) && defined (BROKEN_SIGAIO) |
| 165 | #undef SIGAIO |
| 166 | #endif |
| 167 | #if defined (SIGPTY) && defined (BROKEN_SIGPTY) |
| 168 | #undef SIGPTY |
| 169 | #endif |
| 170 | |
| 171 | |
| 172 | #if NSIG < NSIG_MINIMUM |
| 173 | # ifdef NSIG |
| 174 | # undef NSIG |
| 175 | # endif |
| 176 | # define NSIG NSIG_MINIMUM |
| 177 | #endif |
| 178 | |
| 179 | #ifdef BSD4_1 |
| 180 | #define SIGIO SIGTINT |
| 181 | /* sigfree is in sysdep.c */ |
| 182 | #endif /* BSD4_1 */ |
| 183 | |
| 184 | /* On bsd, [man says] kill does not accept a negative number to kill a pgrp. |
| 185 | Must do that using the killpg call. */ |
| 186 | #ifdef BSD_SYSTEM |
| 187 | #define EMACS_KILLPG(gid, signo) (killpg ( (gid), (signo))) |
| 188 | #else |
| 189 | #ifdef WINDOWSNT |
| 190 | #define EMACS_KILLPG(gid, signo) (kill (gid, signo)) |
| 191 | #else |
| 192 | #define EMACS_KILLPG(gid, signo) (kill (-(gid), (signo))) |
| 193 | #endif |
| 194 | #endif |
| 195 | |
| 196 | /* Define SIGCHLD as an alias for SIGCLD. There are many conditionals |
| 197 | testing SIGCHLD. */ |
| 198 | #ifndef VMS |
| 199 | #ifdef SIGCLD |
| 200 | #ifndef SIGCHLD |
| 201 | #define SIGCHLD SIGCLD |
| 202 | #endif /* SIGCHLD */ |
| 203 | #endif /* ! defined (SIGCLD) */ |
| 204 | #endif /* VMS */ |
| 205 | |
| 206 | #ifndef HAVE_STRSIGNAL |
| 207 | /* strsignal is in sysdep.c */ |
| 208 | char *strsignal (); |
| 209 | #endif |
| 210 | |
| 211 | #ifdef HAVE_GTK_AND_PTHREAD |
| 212 | #define SIGNAL_THREAD_CHECK(signo) \ |
| 213 | do { \ |
| 214 | if (!pthread_equal (pthread_self (), main_thread)) \ |
| 215 | { \ |
| 216 | /* POSIX says any thread can receive the signal. On GNU/Linux \ |
| 217 | that is not true, but for other systems (FreeBSD at least) \ |
| 218 | it is. So direct the signal to the correct thread and block \ |
| 219 | it from this thread. */ \ |
| 220 | sigset_t new_mask; \ |
| 221 | \ |
| 222 | sigemptyset (&new_mask); \ |
| 223 | sigaddset (&new_mask, signo); \ |
| 224 | pthread_sigmask (SIG_BLOCK, &new_mask, 0); \ |
| 225 | pthread_kill (main_thread, signo); \ |
| 226 | return; \ |
| 227 | } \ |
| 228 | } while (0) |
| 229 | |
| 230 | #else /* not HAVE_GTK_AND_PTHREAD */ |
| 231 | #define SIGNAL_THREAD_CHECK(signo) |
| 232 | #endif /* not HAVE_GTK_AND_PTHREAD */ |
| 233 | /* arch-tag: 4580e86a-340d-4574-9e11-a742b6e1a152 |
| 234 | (do not change this comment) */ |