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9ab9afa9 | 1 | /* syssignal.h - System-dependent definitions for signals. |
429ab54e | 2 | Copyright (C) 1993, 1999, 2001, 2002, 2003, 2004, |
49f70d46 | 3 | 2005, 2006, 2007, 2008, 2009, 2010, 2011, 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 | |
2b98b088 TTN |
20 | extern void init_signals P_ ((void)); |
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 | ||
9ab9afa9 | 33 | #ifdef POSIX_SIGNALS |
00eaaa32 | 34 | |
c3aa5fec | 35 | /* Don't #include <signal.h>. That header should always be #included |
cf026b25 JB |
36 | before "config.h", because some configuration files (like s/hpux.h) |
37 | indicate that SIGIO doesn't work by #undef-ing SIGIO. If this file | |
38 | #includes <signal.h>, then that will re-#define SIGIO and confuse | |
39 | things. */ | |
4d553a13 | 40 | /* XXX This is not correct anymore, there is a BROKEN_SIGIO macro. */ |
00eaaa32 | 41 | |
9ab9afa9 JB |
42 | #define SIGMASKTYPE sigset_t |
43 | ||
44 | #define SIGEMPTYMASK (empty_mask) | |
45 | #define SIGFULLMASK (full_mask) | |
47b682b7 | 46 | extern sigset_t empty_mask, full_mask; |
9ab9afa9 | 47 | |
1b1f8f85 | 48 | /* POSIX pretty much destroys any possibility of writing sigmask as a |
47b682b7 AS |
49 | macro in standard C. We always define our own version because the |
50 | predefined macro in Glibc 2.1 is only provided for compatility for old | |
51 | programs that use int as signal mask type. */ | |
52 | #undef sigmask | |
1b1f8f85 JB |
53 | #ifdef __GNUC__ |
54 | #define sigmask(SIG) \ | |
55 | ({ \ | |
56 | sigset_t _mask; \ | |
57 | sigemptyset (&_mask); \ | |
58 | sigaddset (&_mask, SIG); \ | |
59 | _mask; \ | |
60 | }) | |
985a35a3 | 61 | #else /* ! defined (__GNUC__) */ |
9bd67a37 | 62 | extern sigset_t sys_sigmask (); |
1b1f8f85 | 63 | #define sigmask(SIG) (sys_sigmask (SIG)) |
985a35a3 | 64 | #endif /* ! defined (__GNUC__) */ |
1b1f8f85 | 65 | |
47b682b7 AS |
66 | #undef sigpause |
67 | #define sigpause(MASK) sigsuspend (&(MASK)) | |
9f910b50 | 68 | |
69037d5a RS |
69 | #define sigblock(SIG) sys_sigblock (SIG) |
70 | #define sigunblock(SIG) sys_sigunblock (SIG) | |
cc210d67 | 71 | #ifndef sigsetmask |
69037d5a | 72 | #define sigsetmask(SIG) sys_sigsetmask (SIG) |
cc210d67 | 73 | #endif |
9ab9afa9 JB |
74 | #define sighold(SIG) ONLY_USED_IN_BSD_4_1 |
75 | #define sigrelse(SIG) ONLY_USED_IN_BSD_4_1 | |
6c8a1e24 | 76 | #undef signal |
9c063f29 | 77 | #define signal(SIG,ACT) sys_signal(SIG,ACT) |
9ab9afa9 | 78 | |
00eaaa32 | 79 | /* Whether this is what all systems want or not, this is what |
69037d5a | 80 | appears to be assumed in the source, for example data.c:arith_error. */ |
667da7f5 | 81 | typedef RETSIGTYPE (*signal_handler_t) (/*int*/); |
00eaaa32 | 82 | |
030f4475 AS |
83 | signal_handler_t sys_signal P_ ((int signal_number, signal_handler_t action)); |
84 | sigset_t sys_sigblock P_ ((sigset_t new_mask)); | |
85 | sigset_t sys_sigunblock P_ ((sigset_t new_mask)); | |
86 | sigset_t sys_sigsetmask P_ ((sigset_t new_mask)); | |
9ab9afa9 | 87 | |
69037d5a | 88 | #define sys_sigdel(MASK,SIG) sigdelset (&MASK,SIG) |
9ab9afa9 | 89 | |
985a35a3 JB |
90 | #else /* ! defined (POSIX_SIGNALS) */ |
91 | #ifdef USG5_4 | |
92 | ||
094d2b0e GM |
93 | extern SIGMASKTYPE sigprocmask_set; |
94 | ||
69037d5a | 95 | #ifndef sigblock |
094d2b0e GM |
96 | #define sigblock(sig) \ |
97 | (sigprocmask_set = SIGEMPTYMASK | (sig), \ | |
98 | sigprocmask (SIG_BLOCK, &sigprocmask_set, NULL)) | |
69037d5a RS |
99 | #endif |
100 | ||
fe54008f | 101 | #ifndef sigunblock |
094d2b0e GM |
102 | #define sigunblock(sig) \ |
103 | (sigprocmask_set = SIGFULLMASK & ~(sig), \ | |
104 | sigprocmask (SIG_SETMASK, &sigprocmask_set, NULL)) | |
fe54008f | 105 | #endif |
985a35a3 JB |
106 | |
107 | #else | |
108 | #ifdef USG | |
109 | ||
fe54008f | 110 | #ifndef sigunblock |
177c0ea7 | 111 | #define sigunblock(sig) |
fe54008f | 112 | #endif |
985a35a3 JB |
113 | |
114 | #else | |
9ab9afa9 | 115 | |
fe54008f | 116 | #ifndef sigunblock |
9ab9afa9 JB |
117 | #define sigunblock(SIG) \ |
118 | { SIGMASKTYPE omask = sigblock (SIGEMPTYMASK); sigsetmask (omask & ~SIG); } | |
fe54008f | 119 | #endif |
9ab9afa9 | 120 | |
985a35a3 JB |
121 | #endif /* ! defined (USG) */ |
122 | #endif /* ! defined (USG5_4) */ | |
123 | #endif /* ! defined (POSIX_SIGNALS) */ | |
9ab9afa9 JB |
124 | |
125 | #ifndef SIGMASKTYPE | |
126 | #define SIGMASKTYPE int | |
127 | #endif | |
128 | ||
129 | #ifndef SIGEMPTYMASK | |
1b1f8f85 JB |
130 | #define SIGEMPTYMASK (0) |
131 | #endif | |
132 | ||
133 | #ifndef SIGFULLMASK | |
134 | #define SIGFULLMASK (0xffffffff) | |
9ab9afa9 JB |
135 | #endif |
136 | ||
137 | #ifndef sigmask | |
138 | #define sigmask(no) (1L << ((no) - 1)) | |
139 | #endif | |
140 | ||
1b1f8f85 JB |
141 | #ifndef sigunblock |
142 | #define sigunblock(SIG) \ | |
143 | { SIGMASKTYPE omask = sigblock (SIGFULLMASK); sigsetmask (omask & ~SIG); } | |
144 | #endif | |
145 | ||
1b1f8f85 | 146 | #define sigfree() sigsetmask (SIGEMPTYMASK) |
1b1f8f85 | 147 | |
68c45bf0 PE |
148 | #if defined (SIGINFO) && defined (BROKEN_SIGINFO) |
149 | #undef SIGINFO | |
150 | #endif | |
151 | #if defined (SIGIO) && defined (BROKEN_SIGIO) | |
098767d9 EZ |
152 | # undef SIGIO |
153 | # if defined (__Lynx__) | |
154 | # undef SIGPOLL /* Defined as SIGIO on LynxOS */ | |
155 | # endif | |
68c45bf0 PE |
156 | #endif |
157 | #if defined (SIGPOLL) && defined (BROKEN_SIGPOLL) | |
158 | #undef SIGPOLL | |
159 | #endif | |
160 | #if defined (SIGTSTP) && defined (BROKEN_SIGTSTP) | |
161 | #undef SIGTSTP | |
162 | #endif | |
163 | #if defined (SIGURG) && defined (BROKEN_SIGURG) | |
164 | #undef SIGURG | |
165 | #endif | |
4e677396 KH |
166 | #if defined (SIGAIO) && defined (BROKEN_SIGAIO) |
167 | #undef SIGAIO | |
168 | #endif | |
169 | #if defined (SIGPTY) && defined (BROKEN_SIGPTY) | |
170 | #undef SIGPTY | |
171 | #endif | |
172 | ||
68c45bf0 PE |
173 | |
174 | #if NSIG < NSIG_MINIMUM | |
175 | # ifdef NSIG | |
176 | # undef NSIG | |
177 | # endif | |
178 | # define NSIG NSIG_MINIMUM | |
179 | #endif | |
180 | ||
9ab9afa9 JB |
181 | /* On bsd, [man says] kill does not accept a negative number to kill a pgrp. |
182 | Must do that using the killpg call. */ | |
6df54671 | 183 | #ifdef BSD_SYSTEM |
9ab9afa9 JB |
184 | #define EMACS_KILLPG(gid, signo) (killpg ( (gid), (signo))) |
185 | #else | |
57d65592 | 186 | #ifdef WINDOWSNT |
f405affb | 187 | #define EMACS_KILLPG(gid, signo) (kill (gid, signo)) |
57d65592 | 188 | #else |
9ab9afa9 JB |
189 | #define EMACS_KILLPG(gid, signo) (kill (-(gid), (signo))) |
190 | #endif | |
57d65592 | 191 | #endif |
9ab9afa9 JB |
192 | |
193 | /* Define SIGCHLD as an alias for SIGCLD. There are many conditionals | |
194 | testing SIGCHLD. */ | |
9ab9afa9 JB |
195 | #ifdef SIGCLD |
196 | #ifndef SIGCHLD | |
197 | #define SIGCHLD SIGCLD | |
985a35a3 JB |
198 | #endif /* SIGCHLD */ |
199 | #endif /* ! defined (SIGCLD) */ | |
68c45bf0 PE |
200 | |
201 | #ifndef HAVE_STRSIGNAL | |
202 | /* strsignal is in sysdep.c */ | |
203 | char *strsignal (); | |
204 | #endif | |
ab5796a9 | 205 | |
f8240abd | 206 | #ifdef FORWARD_SIGNAL_TO_MAIN_THREAD |
333f1b6f JD |
207 | #define SIGNAL_THREAD_CHECK(signo) \ |
208 | do { \ | |
3fb8b536 | 209 | if (!pthread_equal (pthread_self (), main_thread)) \ |
333f1b6f JD |
210 | { \ |
211 | /* POSIX says any thread can receive the signal. On GNU/Linux \ | |
212 | that is not true, but for other systems (FreeBSD at least) \ | |
213 | it is. So direct the signal to the correct thread and block \ | |
214 | it from this thread. */ \ | |
215 | sigset_t new_mask; \ | |
216 | \ | |
217 | sigemptyset (&new_mask); \ | |
218 | sigaddset (&new_mask, signo); \ | |
219 | pthread_sigmask (SIG_BLOCK, &new_mask, 0); \ | |
220 | pthread_kill (main_thread, signo); \ | |
221 | return; \ | |
222 | } \ | |
223 | } while (0) | |
224 | ||
f8240abd | 225 | #else /* not FORWARD_SIGNAL_TO_MAIN_THREAD */ |
333f1b6f | 226 | #define SIGNAL_THREAD_CHECK(signo) |
f8240abd | 227 | #endif /* not FORWARD_SIGNAL_TO_MAIN_THREAD */ |
ab5796a9 MB |
228 | /* arch-tag: 4580e86a-340d-4574-9e11-a742b6e1a152 |
229 | (do not change this comment) */ |