Remove an incorrect assertion on move_it_by_lines.
[emacs.git] / src / syssignal.h
blob86135d71215ac875c5327c23875b4559b20bcf3f
1 /* syssignal.h - System-dependent definitions for signals.
2 Copyright (C) 1993, 1999, 2001-2012 Free Software Foundation, Inc.
4 This file is part of GNU Emacs.
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
8 the Free Software Foundation, either version 3 of the License, or
9 (at your option) any later version.
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.
16 You should have received a copy of the GNU General Public License
17 along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>. */
19 extern void init_signals (void);
21 #ifdef HAVE_PTHREAD
22 #include <pthread.h>
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
28 /* Don't #include <signal.h>. That header should always be #included
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. */
33 /* XXX This is not correct anymore, there is a BROKEN_SIGIO macro. */
35 #define SIGMASKTYPE sigset_t
37 #define SIGEMPTYMASK (empty_mask)
38 extern sigset_t empty_mask;
40 /* POSIX pretty much destroys any possibility of writing sigmask as a
41 macro in standard C. We always define our own version because the
42 predefined macro in Glibc 2.1 is only provided for compatibility for old
43 programs that use int as signal mask type. */
44 #undef sigmask
45 #ifdef __GNUC__
46 #define sigmask(SIG) \
47 ({ \
48 sigset_t _mask; \
49 sigemptyset (&_mask); \
50 sigaddset (&_mask, SIG); \
51 _mask; \
53 #else /* ! defined (__GNUC__) */
54 extern sigset_t sys_sigmask ();
55 #define sigmask(SIG) (sys_sigmask (SIG))
56 #endif /* ! defined (__GNUC__) */
58 #undef sigpause
59 #define sigpause(MASK) sigsuspend (&(MASK))
61 #define sigblock(SIG) sys_sigblock (SIG)
62 #define sigunblock(SIG) sys_sigunblock (SIG)
63 #ifndef sigsetmask
64 #define sigsetmask(SIG) sys_sigsetmask (SIG)
65 #endif
66 #undef signal
67 #define signal(SIG,ACT) sys_signal(SIG,ACT)
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. */
71 typedef void (*signal_handler_t) (int);
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);
77 #if ! (defined TIOCNOTTY || defined USG5 || defined CYGWIN)
78 void croak (char *) NO_RETURN;
79 #endif
81 #define sys_sigdel(MASK,SIG) sigdelset (&MASK,SIG)
83 #define sigfree() sigsetmask (SIGEMPTYMASK)
85 #if defined (SIGINFO) && defined (BROKEN_SIGINFO)
86 #undef SIGINFO
87 #endif
88 #if defined (SIGIO) && defined (BROKEN_SIGIO)
89 # undef SIGIO
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
100 #if defined (SIGAIO) && defined (BROKEN_SIGAIO)
101 #undef SIGAIO
102 #endif
103 #if defined (SIGPTY) && defined (BROKEN_SIGPTY)
104 #undef SIGPTY
105 #endif
108 #if NSIG < NSIG_MINIMUM
109 # ifdef NSIG
110 # undef NSIG
111 # endif
112 # define NSIG NSIG_MINIMUM
113 #endif
115 /* On bsd, [man says] kill does not accept a negative number to kill a pgrp.
116 Must do that using the killpg call. */
117 #ifdef BSD_SYSTEM
118 #define EMACS_KILLPG(gid, signo) (killpg ( (gid), (signo)))
119 #else
120 #ifdef WINDOWSNT
121 #define EMACS_KILLPG(gid, signo) (kill (gid, signo))
122 #else
123 #define EMACS_KILLPG(gid, signo) (kill (-(gid), (signo)))
124 #endif
125 #endif
127 /* Define SIGCHLD as an alias for SIGCLD. There are many conditionals
128 testing SIGCHLD. */
129 #ifdef SIGCLD
130 #ifndef SIGCHLD
131 #define SIGCHLD SIGCLD
132 #endif /* SIGCHLD */
133 #endif /* ! defined (SIGCLD) */
135 #ifndef HAVE_STRSIGNAL
136 /* strsignal is in sysdep.c */
137 char *strsignal (int);
138 #endif
140 #ifdef FORWARD_SIGNAL_TO_MAIN_THREAD
141 extern pthread_t main_thread;
142 #define SIGNAL_THREAD_CHECK(signo) \
143 do { \
144 if (!pthread_equal (pthread_self (), main_thread)) \
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; \
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; \
158 } while (0)
160 #else /* not FORWARD_SIGNAL_TO_MAIN_THREAD */
161 #define SIGNAL_THREAD_CHECK(signo)
162 #endif /* not FORWARD_SIGNAL_TO_MAIN_THREAD */