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9ab9afa9 | 1 | /* syssignal.h - System-dependent definitions for signals. |
68c45bf0 | 2 | Copyright (C) 1993, 1999 Free Software Foundation, Inc. |
9ab9afa9 JB |
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 | |
7c938215 | 8 | the Free Software Foundation; either version 2, or (at your option) |
9ab9afa9 JB |
9 | 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; see the file COPYING. If not, write to | |
4fc5845f LK |
18 | the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, |
19 | Boston, MA 02110-1301, USA. */ | |
9ab9afa9 | 20 | |
2b98b088 TTN |
21 | extern void init_signals P_ ((void)); |
22 | ||
333f1b6f JD |
23 | #ifdef HAVE_GTK_AND_PTHREAD |
24 | #include <pthread.h> | |
25 | extern pthread_t main_thread; | |
26 | #endif | |
27 | ||
9ab9afa9 | 28 | #ifdef POSIX_SIGNALS |
00eaaa32 | 29 | |
c3aa5fec | 30 | /* Don't #include <signal.h>. That header should always be #included |
cf026b25 JB |
31 | before "config.h", because some configuration files (like s/hpux.h) |
32 | indicate that SIGIO doesn't work by #undef-ing SIGIO. If this file | |
33 | #includes <signal.h>, then that will re-#define SIGIO and confuse | |
34 | things. */ | |
00eaaa32 | 35 | |
9ab9afa9 JB |
36 | #define SIGMASKTYPE sigset_t |
37 | ||
38 | #define SIGEMPTYMASK (empty_mask) | |
39 | #define SIGFULLMASK (full_mask) | |
47b682b7 | 40 | extern sigset_t empty_mask, full_mask; |
9ab9afa9 | 41 | |
1b1f8f85 | 42 | /* POSIX pretty much destroys any possibility of writing sigmask as a |
47b682b7 AS |
43 | macro in standard C. We always define our own version because the |
44 | predefined macro in Glibc 2.1 is only provided for compatility for old | |
45 | programs that use int as signal mask type. */ | |
46 | #undef sigmask | |
1b1f8f85 JB |
47 | #ifdef __GNUC__ |
48 | #define sigmask(SIG) \ | |
49 | ({ \ | |
50 | sigset_t _mask; \ | |
51 | sigemptyset (&_mask); \ | |
52 | sigaddset (&_mask, SIG); \ | |
53 | _mask; \ | |
54 | }) | |
985a35a3 | 55 | #else /* ! defined (__GNUC__) */ |
9bd67a37 | 56 | extern sigset_t sys_sigmask (); |
1b1f8f85 | 57 | #define sigmask(SIG) (sys_sigmask (SIG)) |
985a35a3 | 58 | #endif /* ! defined (__GNUC__) */ |
1b1f8f85 | 59 | |
47b682b7 AS |
60 | #undef sigpause |
61 | #define sigpause(MASK) sigsuspend (&(MASK)) | |
9f910b50 | 62 | |
69037d5a RS |
63 | #define sigblock(SIG) sys_sigblock (SIG) |
64 | #define sigunblock(SIG) sys_sigunblock (SIG) | |
cc210d67 | 65 | #ifndef sigsetmask |
69037d5a | 66 | #define sigsetmask(SIG) sys_sigsetmask (SIG) |
cc210d67 | 67 | #endif |
9ab9afa9 JB |
68 | #define sighold(SIG) ONLY_USED_IN_BSD_4_1 |
69 | #define sigrelse(SIG) ONLY_USED_IN_BSD_4_1 | |
6c8a1e24 | 70 | #undef signal |
9c063f29 | 71 | #define signal(SIG,ACT) sys_signal(SIG,ACT) |
9ab9afa9 | 72 | |
00eaaa32 | 73 | /* Whether this is what all systems want or not, this is what |
69037d5a | 74 | appears to be assumed in the source, for example data.c:arith_error. */ |
667da7f5 | 75 | typedef RETSIGTYPE (*signal_handler_t) (/*int*/); |
00eaaa32 | 76 | |
030f4475 AS |
77 | signal_handler_t sys_signal P_ ((int signal_number, signal_handler_t action)); |
78 | sigset_t sys_sigblock P_ ((sigset_t new_mask)); | |
79 | sigset_t sys_sigunblock P_ ((sigset_t new_mask)); | |
80 | sigset_t sys_sigsetmask P_ ((sigset_t new_mask)); | |
9ab9afa9 | 81 | |
69037d5a | 82 | #define sys_sigdel(MASK,SIG) sigdelset (&MASK,SIG) |
9ab9afa9 | 83 | |
985a35a3 JB |
84 | #else /* ! defined (POSIX_SIGNALS) */ |
85 | #ifdef USG5_4 | |
86 | ||
094d2b0e GM |
87 | extern SIGMASKTYPE sigprocmask_set; |
88 | ||
69037d5a | 89 | #ifndef sigblock |
094d2b0e GM |
90 | #define sigblock(sig) \ |
91 | (sigprocmask_set = SIGEMPTYMASK | (sig), \ | |
92 | sigprocmask (SIG_BLOCK, &sigprocmask_set, NULL)) | |
69037d5a RS |
93 | #endif |
94 | ||
fe54008f | 95 | #ifndef sigunblock |
094d2b0e GM |
96 | #define sigunblock(sig) \ |
97 | (sigprocmask_set = SIGFULLMASK & ~(sig), \ | |
98 | sigprocmask (SIG_SETMASK, &sigprocmask_set, NULL)) | |
fe54008f | 99 | #endif |
985a35a3 JB |
100 | |
101 | #else | |
102 | #ifdef USG | |
103 | ||
fe54008f | 104 | #ifndef sigunblock |
177c0ea7 | 105 | #define sigunblock(sig) |
fe54008f | 106 | #endif |
985a35a3 JB |
107 | |
108 | #else | |
9ab9afa9 | 109 | |
fe54008f | 110 | #ifndef sigunblock |
9ab9afa9 JB |
111 | #define sigunblock(SIG) \ |
112 | { SIGMASKTYPE omask = sigblock (SIGEMPTYMASK); sigsetmask (omask & ~SIG); } | |
fe54008f | 113 | #endif |
9ab9afa9 | 114 | |
985a35a3 JB |
115 | #endif /* ! defined (USG) */ |
116 | #endif /* ! defined (USG5_4) */ | |
117 | #endif /* ! defined (POSIX_SIGNALS) */ | |
9ab9afa9 JB |
118 | |
119 | #ifndef SIGMASKTYPE | |
120 | #define SIGMASKTYPE int | |
121 | #endif | |
122 | ||
123 | #ifndef SIGEMPTYMASK | |
1b1f8f85 JB |
124 | #define SIGEMPTYMASK (0) |
125 | #endif | |
126 | ||
127 | #ifndef SIGFULLMASK | |
128 | #define SIGFULLMASK (0xffffffff) | |
9ab9afa9 JB |
129 | #endif |
130 | ||
131 | #ifndef sigmask | |
132 | #define sigmask(no) (1L << ((no) - 1)) | |
133 | #endif | |
134 | ||
1b1f8f85 JB |
135 | #ifndef sigunblock |
136 | #define sigunblock(SIG) \ | |
137 | { SIGMASKTYPE omask = sigblock (SIGFULLMASK); sigsetmask (omask & ~SIG); } | |
138 | #endif | |
139 | ||
1b1f8f85 JB |
140 | #ifndef BSD4_1 |
141 | #define sigfree() sigsetmask (SIGEMPTYMASK) | |
ea973b10 | 142 | #endif /* not BSD4_1 */ |
1b1f8f85 | 143 | |
68c45bf0 PE |
144 | #if defined (SIGINFO) && defined (BROKEN_SIGINFO) |
145 | #undef SIGINFO | |
146 | #endif | |
147 | #if defined (SIGIO) && defined (BROKEN_SIGIO) | |
148 | #undef SIGIO | |
149 | #endif | |
150 | #if defined (SIGPOLL) && defined (BROKEN_SIGPOLL) | |
151 | #undef SIGPOLL | |
152 | #endif | |
153 | #if defined (SIGTSTP) && defined (BROKEN_SIGTSTP) | |
154 | #undef SIGTSTP | |
155 | #endif | |
156 | #if defined (SIGURG) && defined (BROKEN_SIGURG) | |
157 | #undef SIGURG | |
158 | #endif | |
4e677396 KH |
159 | #if defined (SIGAIO) && defined (BROKEN_SIGAIO) |
160 | #undef SIGAIO | |
161 | #endif | |
162 | #if defined (SIGPTY) && defined (BROKEN_SIGPTY) | |
163 | #undef SIGPTY | |
164 | #endif | |
165 | ||
68c45bf0 PE |
166 | |
167 | #if NSIG < NSIG_MINIMUM | |
168 | # ifdef NSIG | |
169 | # undef NSIG | |
170 | # endif | |
171 | # define NSIG NSIG_MINIMUM | |
172 | #endif | |
173 | ||
9ab9afa9 JB |
174 | #ifdef BSD4_1 |
175 | #define SIGIO SIGTINT | |
645280b7 | 176 | /* sigfree is in sysdep.c */ |
ea973b10 | 177 | #endif /* BSD4_1 */ |
9ab9afa9 JB |
178 | |
179 | /* On bsd, [man says] kill does not accept a negative number to kill a pgrp. | |
180 | Must do that using the killpg call. */ | |
6df54671 | 181 | #ifdef BSD_SYSTEM |
9ab9afa9 JB |
182 | #define EMACS_KILLPG(gid, signo) (killpg ( (gid), (signo))) |
183 | #else | |
57d65592 | 184 | #ifdef WINDOWSNT |
f405affb | 185 | #define EMACS_KILLPG(gid, signo) (kill (gid, signo)) |
57d65592 | 186 | #else |
9ab9afa9 JB |
187 | #define EMACS_KILLPG(gid, signo) (kill (-(gid), (signo))) |
188 | #endif | |
57d65592 | 189 | #endif |
9ab9afa9 JB |
190 | |
191 | /* Define SIGCHLD as an alias for SIGCLD. There are many conditionals | |
192 | testing SIGCHLD. */ | |
9ab9afa9 JB |
193 | #ifndef VMS |
194 | #ifdef SIGCLD | |
195 | #ifndef SIGCHLD | |
196 | #define SIGCHLD SIGCLD | |
985a35a3 JB |
197 | #endif /* SIGCHLD */ |
198 | #endif /* ! defined (SIGCLD) */ | |
199 | #endif /* VMS */ | |
68c45bf0 PE |
200 | |
201 | #ifndef HAVE_STRSIGNAL | |
202 | /* strsignal is in sysdep.c */ | |
203 | char *strsignal (); | |
204 | #endif | |
ab5796a9 | 205 | |
333f1b6f JD |
206 | #ifdef HAVE_GTK_AND_PTHREAD |
207 | #define SIGNAL_THREAD_CHECK(signo) \ | |
208 | do { \ | |
209 | if (pthread_self () != main_thread) \ | |
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 | ||
225 | #else /* not HAVE_GTK_AND_PTHREAD */ | |
226 | #define SIGNAL_THREAD_CHECK(signo) | |
227 | #endif /* not HAVE_GTK_AND_PTHREAD */ | |
ab5796a9 MB |
228 | /* arch-tag: 4580e86a-340d-4574-9e11-a742b6e1a152 |
229 | (do not change this comment) */ |