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9ab9afa9 | 1 | /* syssignal.h - System-dependent definitions for signals. |
429ab54e | 2 | Copyright (C) 1993, 1999, 2001, 2002, 2003, 2004, |
114f9c96 | 3 | 2005, 2006, 2007, 2008, 2009, 2010 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 | |
07b87a10 | 22 | #if defined (HAVE_GTK_AND_PTHREAD) || defined (HAVE_NS) |
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 | ||
29 | #ifdef FORWARD_SIGNAL_TO_MAIN_THREAD | |
333f1b6f JD |
30 | extern pthread_t main_thread; |
31 | #endif | |
32 | ||
c3aa5fec | 33 | /* Don't #include <signal.h>. That header should always be #included |
cf026b25 JB |
34 | before "config.h", because some configuration files (like s/hpux.h) |
35 | indicate that SIGIO doesn't work by #undef-ing SIGIO. If this file | |
36 | #includes <signal.h>, then that will re-#define SIGIO and confuse | |
37 | things. */ | |
4d553a13 | 38 | /* XXX This is not correct anymore, there is a BROKEN_SIGIO macro. */ |
00eaaa32 | 39 | |
9ab9afa9 JB |
40 | #define SIGMASKTYPE sigset_t |
41 | ||
42 | #define SIGEMPTYMASK (empty_mask) | |
43 | #define SIGFULLMASK (full_mask) | |
47b682b7 | 44 | extern sigset_t empty_mask, full_mask; |
9ab9afa9 | 45 | |
1b1f8f85 | 46 | /* POSIX pretty much destroys any possibility of writing sigmask as a |
47b682b7 AS |
47 | macro in standard C. We always define our own version because the |
48 | predefined macro in Glibc 2.1 is only provided for compatility for old | |
49 | programs that use int as signal mask type. */ | |
50 | #undef sigmask | |
1b1f8f85 JB |
51 | #ifdef __GNUC__ |
52 | #define sigmask(SIG) \ | |
53 | ({ \ | |
54 | sigset_t _mask; \ | |
55 | sigemptyset (&_mask); \ | |
56 | sigaddset (&_mask, SIG); \ | |
57 | _mask; \ | |
58 | }) | |
985a35a3 | 59 | #else /* ! defined (__GNUC__) */ |
9bd67a37 | 60 | extern sigset_t sys_sigmask (); |
1b1f8f85 | 61 | #define sigmask(SIG) (sys_sigmask (SIG)) |
985a35a3 | 62 | #endif /* ! defined (__GNUC__) */ |
1b1f8f85 | 63 | |
47b682b7 AS |
64 | #undef sigpause |
65 | #define sigpause(MASK) sigsuspend (&(MASK)) | |
9f910b50 | 66 | |
69037d5a RS |
67 | #define sigblock(SIG) sys_sigblock (SIG) |
68 | #define sigunblock(SIG) sys_sigunblock (SIG) | |
cc210d67 | 69 | #ifndef sigsetmask |
69037d5a | 70 | #define sigsetmask(SIG) sys_sigsetmask (SIG) |
cc210d67 | 71 | #endif |
9ab9afa9 JB |
72 | #define sighold(SIG) ONLY_USED_IN_BSD_4_1 |
73 | #define sigrelse(SIG) ONLY_USED_IN_BSD_4_1 | |
6c8a1e24 | 74 | #undef signal |
9c063f29 | 75 | #define signal(SIG,ACT) sys_signal(SIG,ACT) |
9ab9afa9 | 76 | |
00eaaa32 | 77 | /* Whether this is what all systems want or not, this is what |
69037d5a | 78 | appears to be assumed in the source, for example data.c:arith_error. */ |
c532d349 | 79 | typedef RETSIGTYPE (*signal_handler_t) (int); |
00eaaa32 | 80 | |
383e0970 J |
81 | signal_handler_t sys_signal (int signal_number, signal_handler_t action); |
82 | sigset_t sys_sigblock (sigset_t new_mask); | |
83 | sigset_t sys_sigunblock (sigset_t new_mask); | |
84 | sigset_t sys_sigsetmask (sigset_t new_mask); | |
9ab9afa9 | 85 | |
69037d5a | 86 | #define sys_sigdel(MASK,SIG) sigdelset (&MASK,SIG) |
9ab9afa9 | 87 | |
9ab9afa9 JB |
88 | #ifndef SIGMASKTYPE |
89 | #define SIGMASKTYPE int | |
90 | #endif | |
91 | ||
92 | #ifndef SIGEMPTYMASK | |
1b1f8f85 JB |
93 | #define SIGEMPTYMASK (0) |
94 | #endif | |
95 | ||
96 | #ifndef SIGFULLMASK | |
97 | #define SIGFULLMASK (0xffffffff) | |
9ab9afa9 JB |
98 | #endif |
99 | ||
100 | #ifndef sigmask | |
101 | #define sigmask(no) (1L << ((no) - 1)) | |
102 | #endif | |
103 | ||
1b1f8f85 JB |
104 | #ifndef sigunblock |
105 | #define sigunblock(SIG) \ | |
106 | { SIGMASKTYPE omask = sigblock (SIGFULLMASK); sigsetmask (omask & ~SIG); } | |
107 | #endif | |
108 | ||
1b1f8f85 | 109 | #define sigfree() sigsetmask (SIGEMPTYMASK) |
1b1f8f85 | 110 | |
68c45bf0 PE |
111 | #if defined (SIGINFO) && defined (BROKEN_SIGINFO) |
112 | #undef SIGINFO | |
113 | #endif | |
114 | #if defined (SIGIO) && defined (BROKEN_SIGIO) | |
098767d9 | 115 | # undef SIGIO |
68c45bf0 PE |
116 | #endif |
117 | #if defined (SIGPOLL) && defined (BROKEN_SIGPOLL) | |
118 | #undef SIGPOLL | |
119 | #endif | |
120 | #if defined (SIGTSTP) && defined (BROKEN_SIGTSTP) | |
121 | #undef SIGTSTP | |
122 | #endif | |
123 | #if defined (SIGURG) && defined (BROKEN_SIGURG) | |
124 | #undef SIGURG | |
125 | #endif | |
4e677396 KH |
126 | #if defined (SIGAIO) && defined (BROKEN_SIGAIO) |
127 | #undef SIGAIO | |
128 | #endif | |
129 | #if defined (SIGPTY) && defined (BROKEN_SIGPTY) | |
130 | #undef SIGPTY | |
131 | #endif | |
132 | ||
68c45bf0 PE |
133 | |
134 | #if NSIG < NSIG_MINIMUM | |
135 | # ifdef NSIG | |
136 | # undef NSIG | |
137 | # endif | |
138 | # define NSIG NSIG_MINIMUM | |
139 | #endif | |
140 | ||
9ab9afa9 JB |
141 | /* On bsd, [man says] kill does not accept a negative number to kill a pgrp. |
142 | Must do that using the killpg call. */ | |
6df54671 | 143 | #ifdef BSD_SYSTEM |
9ab9afa9 JB |
144 | #define EMACS_KILLPG(gid, signo) (killpg ( (gid), (signo))) |
145 | #else | |
57d65592 | 146 | #ifdef WINDOWSNT |
f405affb | 147 | #define EMACS_KILLPG(gid, signo) (kill (gid, signo)) |
57d65592 | 148 | #else |
9ab9afa9 JB |
149 | #define EMACS_KILLPG(gid, signo) (kill (-(gid), (signo))) |
150 | #endif | |
57d65592 | 151 | #endif |
9ab9afa9 JB |
152 | |
153 | /* Define SIGCHLD as an alias for SIGCLD. There are many conditionals | |
154 | testing SIGCHLD. */ | |
9ab9afa9 JB |
155 | #ifdef SIGCLD |
156 | #ifndef SIGCHLD | |
157 | #define SIGCHLD SIGCLD | |
985a35a3 JB |
158 | #endif /* SIGCHLD */ |
159 | #endif /* ! defined (SIGCLD) */ | |
68c45bf0 PE |
160 | |
161 | #ifndef HAVE_STRSIGNAL | |
162 | /* strsignal is in sysdep.c */ | |
163 | char *strsignal (); | |
164 | #endif | |
ab5796a9 | 165 | |
f8240abd | 166 | #ifdef FORWARD_SIGNAL_TO_MAIN_THREAD |
333f1b6f JD |
167 | #define SIGNAL_THREAD_CHECK(signo) \ |
168 | do { \ | |
3fb8b536 | 169 | if (!pthread_equal (pthread_self (), main_thread)) \ |
333f1b6f JD |
170 | { \ |
171 | /* POSIX says any thread can receive the signal. On GNU/Linux \ | |
172 | that is not true, but for other systems (FreeBSD at least) \ | |
173 | it is. So direct the signal to the correct thread and block \ | |
174 | it from this thread. */ \ | |
175 | sigset_t new_mask; \ | |
176 | \ | |
177 | sigemptyset (&new_mask); \ | |
178 | sigaddset (&new_mask, signo); \ | |
179 | pthread_sigmask (SIG_BLOCK, &new_mask, 0); \ | |
180 | pthread_kill (main_thread, signo); \ | |
181 | return; \ | |
182 | } \ | |
183 | } while (0) | |
184 | ||
f8240abd | 185 | #else /* not FORWARD_SIGNAL_TO_MAIN_THREAD */ |
333f1b6f | 186 | #define SIGNAL_THREAD_CHECK(signo) |
f8240abd | 187 | #endif /* not FORWARD_SIGNAL_TO_MAIN_THREAD */ |
ab5796a9 MB |
188 | /* arch-tag: 4580e86a-340d-4574-9e11-a742b6e1a152 |
189 | (do not change this comment) */ |