Commit | Line | Data |
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9ab9afa9 | 1 | /* syssignal.h - System-dependent definitions for signals. |
acaf905b | 2 | Copyright (C) 1993, 1999, 2001-2012 Free Software Foundation, Inc. |
9ab9afa9 JB |
3 | |
4 | This file is part of GNU Emacs. | |
5 | ||
b9b1cc14 | 6 | GNU Emacs is free software: you can redistribute it and/or modify |
9ab9afa9 | 7 | it under the terms of the GNU General Public License as published by |
b9b1cc14 GM |
8 | the Free Software Foundation, either version 3 of the License, or |
9 | (at your option) any later version. | |
9ab9afa9 JB |
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 | |
b9b1cc14 | 17 | along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>. */ |
9ab9afa9 | 18 | |
383e0970 | 19 | extern void init_signals (void); |
2b98b088 | 20 | |
ae9e757a | 21 | #ifdef HAVE_PTHREAD |
333f1b6f | 22 | #include <pthread.h> |
f8240abd YM |
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 | ||
c3aa5fec | 28 | /* Don't #include <signal.h>. That header should always be #included |
cf026b25 JB |
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. */ | |
4d553a13 | 33 | /* XXX This is not correct anymore, there is a BROKEN_SIGIO macro. */ |
00eaaa32 | 34 | |
9ab9afa9 JB |
35 | #define SIGMASKTYPE sigset_t |
36 | ||
37 | #define SIGEMPTYMASK (empty_mask) | |
1fa53021 | 38 | extern sigset_t empty_mask; |
9ab9afa9 | 39 | |
1b1f8f85 | 40 | /* POSIX pretty much destroys any possibility of writing sigmask as a |
47b682b7 | 41 | macro in standard C. We always define our own version because the |
da6062e6 | 42 | predefined macro in Glibc 2.1 is only provided for compatibility for old |
47b682b7 AS |
43 | programs that use int as signal mask type. */ |
44 | #undef sigmask | |
1b1f8f85 JB |
45 | #ifdef __GNUC__ |
46 | #define sigmask(SIG) \ | |
47 | ({ \ | |
48 | sigset_t _mask; \ | |
49 | sigemptyset (&_mask); \ | |
50 | sigaddset (&_mask, SIG); \ | |
51 | _mask; \ | |
52 | }) | |
985a35a3 | 53 | #else /* ! defined (__GNUC__) */ |
9bd67a37 | 54 | extern sigset_t sys_sigmask (); |
1b1f8f85 | 55 | #define sigmask(SIG) (sys_sigmask (SIG)) |
985a35a3 | 56 | #endif /* ! defined (__GNUC__) */ |
1b1f8f85 | 57 | |
47b682b7 AS |
58 | #undef sigpause |
59 | #define sigpause(MASK) sigsuspend (&(MASK)) | |
9f910b50 | 60 | |
69037d5a RS |
61 | #define sigblock(SIG) sys_sigblock (SIG) |
62 | #define sigunblock(SIG) sys_sigunblock (SIG) | |
cc210d67 | 63 | #ifndef sigsetmask |
69037d5a | 64 | #define sigsetmask(SIG) sys_sigsetmask (SIG) |
cc210d67 | 65 | #endif |
6c8a1e24 | 66 | #undef signal |
9c063f29 | 67 | #define signal(SIG,ACT) sys_signal(SIG,ACT) |
9ab9afa9 | 68 | |
ae877222 DN |
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. */ | |
9af30bdf | 71 | typedef void (*signal_handler_t) (int); |
ae877222 | 72 | |
383e0970 J |
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); | |
5d4cb038 | 77 | #if ! (defined TIOCNOTTY || defined USG5 || defined CYGWIN) |
adddb265 | 78 | void croak (char *) NO_RETURN; |
5d4cb038 | 79 | #endif |
9ab9afa9 | 80 | |
69037d5a | 81 | #define sys_sigdel(MASK,SIG) sigdelset (&MASK,SIG) |
9ab9afa9 | 82 | |
1b1f8f85 | 83 | #define sigfree() sigsetmask (SIGEMPTYMASK) |
1b1f8f85 | 84 | |
68c45bf0 PE |
85 | #if defined (SIGINFO) && defined (BROKEN_SIGINFO) |
86 | #undef SIGINFO | |
87 | #endif | |
88 | #if defined (SIGIO) && defined (BROKEN_SIGIO) | |
098767d9 | 89 | # undef SIGIO |
68c45bf0 PE |
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 | |
4e677396 KH |
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 | ||
68c45bf0 PE |
107 | |
108 | #if NSIG < NSIG_MINIMUM | |
109 | # ifdef NSIG | |
110 | # undef NSIG | |
111 | # endif | |
112 | # define NSIG NSIG_MINIMUM | |
113 | #endif | |
114 | ||
9ab9afa9 JB |
115 | /* On bsd, [man says] kill does not accept a negative number to kill a pgrp. |
116 | Must do that using the killpg call. */ | |
6df54671 | 117 | #ifdef BSD_SYSTEM |
9ab9afa9 JB |
118 | #define EMACS_KILLPG(gid, signo) (killpg ( (gid), (signo))) |
119 | #else | |
57d65592 | 120 | #ifdef WINDOWSNT |
f405affb | 121 | #define EMACS_KILLPG(gid, signo) (kill (gid, signo)) |
57d65592 | 122 | #else |
9ab9afa9 JB |
123 | #define EMACS_KILLPG(gid, signo) (kill (-(gid), (signo))) |
124 | #endif | |
57d65592 | 125 | #endif |
9ab9afa9 JB |
126 | |
127 | /* Define SIGCHLD as an alias for SIGCLD. There are many conditionals | |
128 | testing SIGCHLD. */ | |
9ab9afa9 JB |
129 | #ifdef SIGCLD |
130 | #ifndef SIGCHLD | |
131 | #define SIGCHLD SIGCLD | |
985a35a3 JB |
132 | #endif /* SIGCHLD */ |
133 | #endif /* ! defined (SIGCLD) */ | |
68c45bf0 PE |
134 | |
135 | #ifndef HAVE_STRSIGNAL | |
136 | /* strsignal is in sysdep.c */ | |
361358ea | 137 | char *strsignal (int); |
68c45bf0 | 138 | #endif |
ab5796a9 | 139 | |
f8240abd | 140 | #ifdef FORWARD_SIGNAL_TO_MAIN_THREAD |
dff94ed5 | 141 | extern pthread_t main_thread; |
333f1b6f JD |
142 | #define SIGNAL_THREAD_CHECK(signo) \ |
143 | do { \ | |
3fb8b536 | 144 | if (!pthread_equal (pthread_self (), main_thread)) \ |
333f1b6f JD |
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 | ||
f8240abd | 160 | #else /* not FORWARD_SIGNAL_TO_MAIN_THREAD */ |
333f1b6f | 161 | #define SIGNAL_THREAD_CHECK(signo) |
f8240abd | 162 | #endif /* not FORWARD_SIGNAL_TO_MAIN_THREAD */ |