1 /* syssignal.h - System-dependent definitions for signals.
2 Copyright (C) 1993, 1999, 2002, 2003, 2004,
3 2005 Free Software Foundation, Inc.
5 This file is part of GNU Emacs.
7 GNU Emacs is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2, or (at your option)
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.
17 You should have received a copy of the GNU General Public License
18 along with GNU Emacs; see the file COPYING. If not, write to
19 the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
20 Boston, MA 02110-1301, USA. */
22 extern void init_signals
P_ ((void));
24 #ifdef HAVE_GTK_AND_PTHREAD
26 extern pthread_t main_thread
;
31 /* Don't #include <signal.h>. That header should always be #included
32 before "config.h", because some configuration files (like s/hpux.h)
33 indicate that SIGIO doesn't work by #undef-ing SIGIO. If this file
34 #includes <signal.h>, then that will re-#define SIGIO and confuse
37 #define SIGMASKTYPE sigset_t
39 #define SIGEMPTYMASK (empty_mask)
40 #define SIGFULLMASK (full_mask)
41 extern sigset_t empty_mask
, full_mask
;
43 /* POSIX pretty much destroys any possibility of writing sigmask as a
44 macro in standard C. We always define our own version because the
45 predefined macro in Glibc 2.1 is only provided for compatility for old
46 programs that use int as signal mask type. */
49 #define sigmask(SIG) \
52 sigemptyset (&_mask); \
53 sigaddset (&_mask, SIG); \
56 #else /* ! defined (__GNUC__) */
57 extern sigset_t
sys_sigmask ();
58 #define sigmask(SIG) (sys_sigmask (SIG))
59 #endif /* ! defined (__GNUC__) */
62 #define sigpause(MASK) sigsuspend (&(MASK))
64 #define sigblock(SIG) sys_sigblock (SIG)
65 #define sigunblock(SIG) sys_sigunblock (SIG)
67 #define sigsetmask(SIG) sys_sigsetmask (SIG)
69 #define sighold(SIG) ONLY_USED_IN_BSD_4_1
70 #define sigrelse(SIG) ONLY_USED_IN_BSD_4_1
72 #define signal(SIG,ACT) sys_signal(SIG,ACT)
74 /* Whether this is what all systems want or not, this is what
75 appears to be assumed in the source, for example data.c:arith_error. */
76 typedef RETSIGTYPE (*signal_handler_t
) (/*int*/);
78 signal_handler_t sys_signal
P_ ((int signal_number
, signal_handler_t action
));
79 sigset_t sys_sigblock
P_ ((sigset_t new_mask
));
80 sigset_t sys_sigunblock
P_ ((sigset_t new_mask
));
81 sigset_t sys_sigsetmask
P_ ((sigset_t new_mask
));
83 #define sys_sigdel(MASK,SIG) sigdelset (&MASK,SIG)
85 #else /* ! defined (POSIX_SIGNALS) */
88 extern SIGMASKTYPE sigprocmask_set
;
91 #define sigblock(sig) \
92 (sigprocmask_set = SIGEMPTYMASK | (sig), \
93 sigprocmask (SIG_BLOCK, &sigprocmask_set, NULL))
97 #define sigunblock(sig) \
98 (sigprocmask_set = SIGFULLMASK & ~(sig), \
99 sigprocmask (SIG_SETMASK, &sigprocmask_set, NULL))
106 #define sigunblock(sig)
112 #define sigunblock(SIG) \
113 { SIGMASKTYPE omask = sigblock (SIGEMPTYMASK); sigsetmask (omask & ~SIG); }
116 #endif /* ! defined (USG) */
117 #endif /* ! defined (USG5_4) */
118 #endif /* ! defined (POSIX_SIGNALS) */
121 #define SIGMASKTYPE int
125 #define SIGEMPTYMASK (0)
129 #define SIGFULLMASK (0xffffffff)
133 #define sigmask(no) (1L << ((no) - 1))
137 #define sigunblock(SIG) \
138 { SIGMASKTYPE omask = sigblock (SIGFULLMASK); sigsetmask (omask & ~SIG); }
142 #define sigfree() sigsetmask (SIGEMPTYMASK)
143 #endif /* not BSD4_1 */
145 #if defined (SIGINFO) && defined (BROKEN_SIGINFO)
148 #if defined (SIGIO) && defined (BROKEN_SIGIO)
151 #if defined (SIGPOLL) && defined (BROKEN_SIGPOLL)
154 #if defined (SIGTSTP) && defined (BROKEN_SIGTSTP)
157 #if defined (SIGURG) && defined (BROKEN_SIGURG)
160 #if defined (SIGAIO) && defined (BROKEN_SIGAIO)
163 #if defined (SIGPTY) && defined (BROKEN_SIGPTY)
168 #if NSIG < NSIG_MINIMUM
172 # define NSIG NSIG_MINIMUM
176 #define SIGIO SIGTINT
177 /* sigfree is in sysdep.c */
180 /* On bsd, [man says] kill does not accept a negative number to kill a pgrp.
181 Must do that using the killpg call. */
183 #define EMACS_KILLPG(gid, signo) (killpg ( (gid), (signo)))
186 #define EMACS_KILLPG(gid, signo) (kill (gid, signo))
188 #define EMACS_KILLPG(gid, signo) (kill (-(gid), (signo)))
192 /* Define SIGCHLD as an alias for SIGCLD. There are many conditionals
197 #define SIGCHLD SIGCLD
199 #endif /* ! defined (SIGCLD) */
202 #ifndef HAVE_STRSIGNAL
203 /* strsignal is in sysdep.c */
207 #ifdef HAVE_GTK_AND_PTHREAD
208 #define SIGNAL_THREAD_CHECK(signo) \
210 if (pthread_self () != main_thread) \
212 /* POSIX says any thread can receive the signal. On GNU/Linux \
213 that is not true, but for other systems (FreeBSD at least) \
214 it is. So direct the signal to the correct thread and block \
215 it from this thread. */ \
218 sigemptyset (&new_mask); \
219 sigaddset (&new_mask, signo); \
220 pthread_sigmask (SIG_BLOCK, &new_mask, 0); \
221 pthread_kill (main_thread, signo); \
226 #else /* not HAVE_GTK_AND_PTHREAD */
227 #define SIGNAL_THREAD_CHECK(signo)
228 #endif /* not HAVE_GTK_AND_PTHREAD */
229 /* arch-tag: 4580e86a-340d-4574-9e11-a742b6e1a152
230 (do not change this comment) */