| 1 | /* syssignal.h - System-dependent definitions for signals. |
| 2 | Copyright (C) 1993, 1999, 2001-2011 Free Software Foundation, Inc. |
| 3 | |
| 4 | This file is part of GNU Emacs. |
| 5 | |
| 6 | GNU Emacs is free software: you can redistribute it and/or modify |
| 7 | it under the terms of the GNU General Public License as published by |
| 8 | the Free Software Foundation, either version 3 of the License, or |
| 9 | (at your option) any later version. |
| 10 | |
| 11 | GNU Emacs is distributed in the hope that it will be useful, |
| 12 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | GNU General Public License for more details. |
| 15 | |
| 16 | You should have received a copy of the GNU General Public License |
| 17 | along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>. */ |
| 18 | |
| 19 | extern void init_signals (void); |
| 20 | |
| 21 | #if defined (HAVE_GTK_AND_PTHREAD) || defined (HAVE_NS) |
| 22 | #include <pthread.h> |
| 23 | /* If defined, asynchronous signals delivered to a non-main thread are |
| 24 | forwarded to the main thread. */ |
| 25 | #define FORWARD_SIGNAL_TO_MAIN_THREAD |
| 26 | #endif |
| 27 | |
| 28 | /* Don't #include <signal.h>. That header should always be #included |
| 29 | before "config.h", because some configuration files (like s/hpux.h) |
| 30 | indicate that SIGIO doesn't work by #undef-ing SIGIO. If this file |
| 31 | #includes <signal.h>, then that will re-#define SIGIO and confuse |
| 32 | things. */ |
| 33 | /* XXX This is not correct anymore, there is a BROKEN_SIGIO macro. */ |
| 34 | |
| 35 | #define SIGMASKTYPE sigset_t |
| 36 | |
| 37 | #define SIGEMPTYMASK (empty_mask) |
| 38 | extern sigset_t empty_mask; |
| 39 | |
| 40 | /* POSIX pretty much destroys any possibility of writing sigmask as a |
| 41 | macro in standard C. We always define our own version because the |
| 42 | predefined macro in Glibc 2.1 is only provided for compatility for old |
| 43 | programs that use int as signal mask type. */ |
| 44 | #undef sigmask |
| 45 | #ifdef __GNUC__ |
| 46 | #define sigmask(SIG) \ |
| 47 | ({ \ |
| 48 | sigset_t _mask; \ |
| 49 | sigemptyset (&_mask); \ |
| 50 | sigaddset (&_mask, SIG); \ |
| 51 | _mask; \ |
| 52 | }) |
| 53 | #else /* ! defined (__GNUC__) */ |
| 54 | extern sigset_t sys_sigmask (); |
| 55 | #define sigmask(SIG) (sys_sigmask (SIG)) |
| 56 | #endif /* ! defined (__GNUC__) */ |
| 57 | |
| 58 | #undef sigpause |
| 59 | #define sigpause(MASK) sigsuspend (&(MASK)) |
| 60 | |
| 61 | #define sigblock(SIG) sys_sigblock (SIG) |
| 62 | #define sigunblock(SIG) sys_sigunblock (SIG) |
| 63 | #ifndef sigsetmask |
| 64 | #define sigsetmask(SIG) sys_sigsetmask (SIG) |
| 65 | #endif |
| 66 | #undef signal |
| 67 | #define signal(SIG,ACT) sys_signal(SIG,ACT) |
| 68 | |
| 69 | /* Whether this is what all systems want or not, this is what |
| 70 | appears to be assumed in the source, for example data.c:arith_error. */ |
| 71 | typedef void (*signal_handler_t) (int); |
| 72 | |
| 73 | signal_handler_t sys_signal (int signal_number, signal_handler_t action); |
| 74 | sigset_t sys_sigblock (sigset_t new_mask); |
| 75 | sigset_t sys_sigunblock (sigset_t new_mask); |
| 76 | sigset_t sys_sigsetmask (sigset_t new_mask); |
| 77 | #if ! (defined TIOCNOTTY || defined USG5 || defined CYGWIN) |
| 78 | void croak (char *) NO_RETURN; |
| 79 | #endif |
| 80 | |
| 81 | #define sys_sigdel(MASK,SIG) sigdelset (&MASK,SIG) |
| 82 | |
| 83 | #define sigfree() sigsetmask (SIGEMPTYMASK) |
| 84 | |
| 85 | #if defined (SIGINFO) && defined (BROKEN_SIGINFO) |
| 86 | #undef SIGINFO |
| 87 | #endif |
| 88 | #if defined (SIGIO) && defined (BROKEN_SIGIO) |
| 89 | # undef SIGIO |
| 90 | #endif |
| 91 | #if defined (SIGPOLL) && defined (BROKEN_SIGPOLL) |
| 92 | #undef SIGPOLL |
| 93 | #endif |
| 94 | #if defined (SIGTSTP) && defined (BROKEN_SIGTSTP) |
| 95 | #undef SIGTSTP |
| 96 | #endif |
| 97 | #if defined (SIGURG) && defined (BROKEN_SIGURG) |
| 98 | #undef SIGURG |
| 99 | #endif |
| 100 | #if defined (SIGAIO) && defined (BROKEN_SIGAIO) |
| 101 | #undef SIGAIO |
| 102 | #endif |
| 103 | #if defined (SIGPTY) && defined (BROKEN_SIGPTY) |
| 104 | #undef SIGPTY |
| 105 | #endif |
| 106 | |
| 107 | |
| 108 | #if NSIG < NSIG_MINIMUM |
| 109 | # ifdef NSIG |
| 110 | # undef NSIG |
| 111 | # endif |
| 112 | # define NSIG NSIG_MINIMUM |
| 113 | #endif |
| 114 | |
| 115 | /* On bsd, [man says] kill does not accept a negative number to kill a pgrp. |
| 116 | Must do that using the killpg call. */ |
| 117 | #ifdef BSD_SYSTEM |
| 118 | #define EMACS_KILLPG(gid, signo) (killpg ( (gid), (signo))) |
| 119 | #else |
| 120 | #ifdef WINDOWSNT |
| 121 | #define EMACS_KILLPG(gid, signo) (kill (gid, signo)) |
| 122 | #else |
| 123 | #define EMACS_KILLPG(gid, signo) (kill (-(gid), (signo))) |
| 124 | #endif |
| 125 | #endif |
| 126 | |
| 127 | /* Define SIGCHLD as an alias for SIGCLD. There are many conditionals |
| 128 | testing SIGCHLD. */ |
| 129 | #ifdef SIGCLD |
| 130 | #ifndef SIGCHLD |
| 131 | #define SIGCHLD SIGCLD |
| 132 | #endif /* SIGCHLD */ |
| 133 | #endif /* ! defined (SIGCLD) */ |
| 134 | |
| 135 | #ifndef HAVE_STRSIGNAL |
| 136 | /* strsignal is in sysdep.c */ |
| 137 | char *strsignal (int); |
| 138 | #endif |
| 139 | |
| 140 | #ifdef FORWARD_SIGNAL_TO_MAIN_THREAD |
| 141 | extern pthread_t main_thread; |
| 142 | #define SIGNAL_THREAD_CHECK(signo) \ |
| 143 | do { \ |
| 144 | if (!pthread_equal (pthread_self (), main_thread)) \ |
| 145 | { \ |
| 146 | /* POSIX says any thread can receive the signal. On GNU/Linux \ |
| 147 | that is not true, but for other systems (FreeBSD at least) \ |
| 148 | it is. So direct the signal to the correct thread and block \ |
| 149 | it from this thread. */ \ |
| 150 | sigset_t new_mask; \ |
| 151 | \ |
| 152 | sigemptyset (&new_mask); \ |
| 153 | sigaddset (&new_mask, signo); \ |
| 154 | pthread_sigmask (SIG_BLOCK, &new_mask, 0); \ |
| 155 | pthread_kill (main_thread, signo); \ |
| 156 | return; \ |
| 157 | } \ |
| 158 | } while (0) |
| 159 | |
| 160 | #else /* not FORWARD_SIGNAL_TO_MAIN_THREAD */ |
| 161 | #define SIGNAL_THREAD_CHECK(signo) |
| 162 | #endif /* not FORWARD_SIGNAL_TO_MAIN_THREAD */ |