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9ab9afa9 | 1 | /* syssignal.h - System-dependent definitions for signals. |
99cf43f9 GM |
2 | |
3 | Copyright (C) 1993, 1999, 2001-2012 Free Software Foundation, Inc. | |
9ab9afa9 JB |
4 | |
5 | This file is part of GNU Emacs. | |
6 | ||
b9b1cc14 | 7 | GNU Emacs is free software: you can redistribute it and/or modify |
9ab9afa9 | 8 | it under the terms of the GNU General Public License as published by |
b9b1cc14 GM |
9 | the Free Software Foundation, either version 3 of the License, or |
10 | (at your option) any later version. | |
9ab9afa9 JB |
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 | |
b9b1cc14 | 18 | along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>. */ |
9ab9afa9 | 19 | |
383e0970 | 20 | extern void init_signals (void); |
2b98b088 | 21 | |
ae9e757a | 22 | #ifdef HAVE_PTHREAD |
333f1b6f | 23 | #include <pthread.h> |
f8240abd YM |
24 | /* If defined, asynchronous signals delivered to a non-main thread are |
25 | forwarded to the main thread. */ | |
26 | #define FORWARD_SIGNAL_TO_MAIN_THREAD | |
27 | #endif | |
28 | ||
c3aa5fec | 29 | /* Don't #include <signal.h>. That header should always be #included |
cf026b25 JB |
30 | before "config.h", because some configuration files (like s/hpux.h) |
31 | indicate that SIGIO doesn't work by #undef-ing SIGIO. If this file | |
32 | #includes <signal.h>, then that will re-#define SIGIO and confuse | |
33 | things. */ | |
4d553a13 | 34 | /* XXX This is not correct anymore, there is a BROKEN_SIGIO macro. */ |
00eaaa32 | 35 | |
9ab9afa9 JB |
36 | #define SIGMASKTYPE sigset_t |
37 | ||
38 | #define SIGEMPTYMASK (empty_mask) | |
1fa53021 | 39 | extern sigset_t empty_mask; |
9ab9afa9 | 40 | |
1b1f8f85 | 41 | /* POSIX pretty much destroys any possibility of writing sigmask as a |
47b682b7 | 42 | macro in standard C. We always define our own version because the |
da6062e6 | 43 | predefined macro in Glibc 2.1 is only provided for compatibility for old |
47b682b7 AS |
44 | programs that use int as signal mask type. */ |
45 | #undef sigmask | |
1b1f8f85 JB |
46 | #ifdef __GNUC__ |
47 | #define sigmask(SIG) \ | |
48 | ({ \ | |
49 | sigset_t _mask; \ | |
50 | sigemptyset (&_mask); \ | |
51 | sigaddset (&_mask, SIG); \ | |
52 | _mask; \ | |
53 | }) | |
985a35a3 | 54 | #else /* ! defined (__GNUC__) */ |
9bd67a37 | 55 | extern sigset_t sys_sigmask (); |
1b1f8f85 | 56 | #define sigmask(SIG) (sys_sigmask (SIG)) |
985a35a3 | 57 | #endif /* ! defined (__GNUC__) */ |
1b1f8f85 | 58 | |
47b682b7 AS |
59 | #undef sigpause |
60 | #define sigpause(MASK) sigsuspend (&(MASK)) | |
9f910b50 | 61 | |
69037d5a RS |
62 | #define sigblock(SIG) sys_sigblock (SIG) |
63 | #define sigunblock(SIG) sys_sigunblock (SIG) | |
cc210d67 | 64 | #ifndef sigsetmask |
69037d5a | 65 | #define sigsetmask(SIG) sys_sigsetmask (SIG) |
cc210d67 | 66 | #endif |
6c8a1e24 | 67 | #undef signal |
9c063f29 | 68 | #define signal(SIG,ACT) sys_signal(SIG,ACT) |
9ab9afa9 | 69 | |
ae877222 DN |
70 | /* Whether this is what all systems want or not, this is what |
71 | appears to be assumed in the source, for example data.c:arith_error. */ | |
9af30bdf | 72 | typedef void (*signal_handler_t) (int); |
ae877222 | 73 | |
383e0970 J |
74 | signal_handler_t sys_signal (int signal_number, signal_handler_t action); |
75 | sigset_t sys_sigblock (sigset_t new_mask); | |
76 | sigset_t sys_sigunblock (sigset_t new_mask); | |
77 | sigset_t sys_sigsetmask (sigset_t new_mask); | |
5d4cb038 | 78 | #if ! (defined TIOCNOTTY || defined USG5 || defined CYGWIN) |
845ca893 | 79 | _Noreturn void croak (char *); |
5d4cb038 | 80 | #endif |
9ab9afa9 | 81 | |
69037d5a | 82 | #define sys_sigdel(MASK,SIG) sigdelset (&MASK,SIG) |
9ab9afa9 | 83 | |
1b1f8f85 | 84 | #define sigfree() sigsetmask (SIGEMPTYMASK) |
1b1f8f85 | 85 | |
68c45bf0 | 86 | #if defined (SIGIO) && defined (BROKEN_SIGIO) |
098767d9 | 87 | # undef SIGIO |
68c45bf0 | 88 | #endif |
ea0bbd17 | 89 | /* These are only used by AIX */ |
68c45bf0 PE |
90 | #if defined (SIGPOLL) && defined (BROKEN_SIGPOLL) |
91 | #undef SIGPOLL | |
92 | #endif | |
4e677396 KH |
93 | #if defined (SIGAIO) && defined (BROKEN_SIGAIO) |
94 | #undef SIGAIO | |
95 | #endif | |
96 | #if defined (SIGPTY) && defined (BROKEN_SIGPTY) | |
97 | #undef SIGPTY | |
98 | #endif | |
99 | ||
68c45bf0 | 100 | |
739ae010 | 101 | /* FIXME? Emacs only defines NSIG_MINIMUM on some platforms? */ |
68c45bf0 PE |
102 | #if NSIG < NSIG_MINIMUM |
103 | # ifdef NSIG | |
104 | # undef NSIG | |
105 | # endif | |
106 | # define NSIG NSIG_MINIMUM | |
107 | #endif | |
108 | ||
9ab9afa9 JB |
109 | /* On bsd, [man says] kill does not accept a negative number to kill a pgrp. |
110 | Must do that using the killpg call. */ | |
6df54671 | 111 | #ifdef BSD_SYSTEM |
9ab9afa9 JB |
112 | #define EMACS_KILLPG(gid, signo) (killpg ( (gid), (signo))) |
113 | #else | |
57d65592 | 114 | #ifdef WINDOWSNT |
f405affb | 115 | #define EMACS_KILLPG(gid, signo) (kill (gid, signo)) |
57d65592 | 116 | #else |
9ab9afa9 JB |
117 | #define EMACS_KILLPG(gid, signo) (kill (-(gid), (signo))) |
118 | #endif | |
57d65592 | 119 | #endif |
9ab9afa9 JB |
120 | |
121 | /* Define SIGCHLD as an alias for SIGCLD. There are many conditionals | |
122 | testing SIGCHLD. */ | |
9ab9afa9 JB |
123 | #ifdef SIGCLD |
124 | #ifndef SIGCHLD | |
125 | #define SIGCHLD SIGCLD | |
985a35a3 JB |
126 | #endif /* SIGCHLD */ |
127 | #endif /* ! defined (SIGCLD) */ | |
68c45bf0 PE |
128 | |
129 | #ifndef HAVE_STRSIGNAL | |
130 | /* strsignal is in sysdep.c */ | |
361358ea | 131 | char *strsignal (int); |
68c45bf0 | 132 | #endif |
ab5796a9 | 133 | |
f8240abd | 134 | #ifdef FORWARD_SIGNAL_TO_MAIN_THREAD |
dff94ed5 | 135 | extern pthread_t main_thread; |
333f1b6f JD |
136 | #define SIGNAL_THREAD_CHECK(signo) \ |
137 | do { \ | |
3fb8b536 | 138 | if (!pthread_equal (pthread_self (), main_thread)) \ |
333f1b6f JD |
139 | { \ |
140 | /* POSIX says any thread can receive the signal. On GNU/Linux \ | |
141 | that is not true, but for other systems (FreeBSD at least) \ | |
142 | it is. So direct the signal to the correct thread and block \ | |
143 | it from this thread. */ \ | |
144 | sigset_t new_mask; \ | |
145 | \ | |
146 | sigemptyset (&new_mask); \ | |
147 | sigaddset (&new_mask, signo); \ | |
148 | pthread_sigmask (SIG_BLOCK, &new_mask, 0); \ | |
149 | pthread_kill (main_thread, signo); \ | |
150 | return; \ | |
151 | } \ | |
152 | } while (0) | |
153 | ||
f8240abd | 154 | #else /* not FORWARD_SIGNAL_TO_MAIN_THREAD */ |
333f1b6f | 155 | #define SIGNAL_THREAD_CHECK(signo) |
f8240abd | 156 | #endif /* not FORWARD_SIGNAL_TO_MAIN_THREAD */ |