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[emacs.git] / src / syssignal.h
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1 /* syssignal.h - System-dependent definitions for signals.
2 Copyright (C) 1993, 1999 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 2, or (at your option)
9 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; see the file COPYING. If not, write to
18 the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
19 Boston, MA 02111-1307, USA. */
21 #ifdef POSIX_SIGNALS
23 /* Don't #include <signal.h>. That header should always be #included
24 before "config.h", because some configuration files (like s/hpux.h)
25 indicate that SIGIO doesn't work by #undef-ing SIGIO. If this file
26 #includes <signal.h>, then that will re-#define SIGIO and confuse
27 things. */
29 #define SIGMASKTYPE sigset_t
31 #define SIGEMPTYMASK (empty_mask)
32 #define SIGFULLMASK (full_mask)
33 extern sigset_t empty_mask, full_mask;
34 extern void init_signals P_ ((void));
36 /* POSIX pretty much destroys any possibility of writing sigmask as a
37 macro in standard C. We always define our own version because the
38 predefined macro in Glibc 2.1 is only provided for compatility for old
39 programs that use int as signal mask type. */
40 #undef sigmask
41 #ifdef __GNUC__
42 #define sigmask(SIG) \
43 ({ \
44 sigset_t _mask; \
45 sigemptyset (&_mask); \
46 sigaddset (&_mask, SIG); \
47 _mask; \
49 #else /* ! defined (__GNUC__) */
50 extern sigset_t sys_sigmask ();
51 #define sigmask(SIG) (sys_sigmask (SIG))
52 #endif /* ! defined (__GNUC__) */
54 #undef sigpause
55 #define sigpause(MASK) sigsuspend (&(MASK))
57 #define sigblock(SIG) sys_sigblock (SIG)
58 #define sigunblock(SIG) sys_sigunblock (SIG)
59 #ifndef sigsetmask
60 #define sigsetmask(SIG) sys_sigsetmask (SIG)
61 #endif
62 #define sighold(SIG) ONLY_USED_IN_BSD_4_1
63 #define sigrelse(SIG) ONLY_USED_IN_BSD_4_1
64 #undef signal
65 #define signal(SIG,ACT) sys_signal(SIG,ACT)
67 /* Whether this is what all systems want or not, this is what
68 appears to be assumed in the source, for example data.c:arith_error. */
69 typedef RETSIGTYPE (*signal_handler_t) (/*int*/);
71 signal_handler_t sys_signal P_ ((int signal_number, signal_handler_t action));
72 sigset_t sys_sigblock P_ ((sigset_t new_mask));
73 sigset_t sys_sigunblock P_ ((sigset_t new_mask));
74 sigset_t sys_sigsetmask P_ ((sigset_t new_mask));
76 #define sys_sigdel(MASK,SIG) sigdelset (&MASK,SIG)
78 #else /* ! defined (POSIX_SIGNALS) */
79 #ifdef USG5_4
81 extern SIGMASKTYPE sigprocmask_set;
83 #ifndef sigblock
84 #define sigblock(sig) \
85 (sigprocmask_set = SIGEMPTYMASK | (sig), \
86 sigprocmask (SIG_BLOCK, &sigprocmask_set, NULL))
87 #endif
89 #define sigunblock(sig) \
90 (sigprocmask_set = SIGFULLMASK & ~(sig), \
91 sigprocmask (SIG_SETMASK, &sigprocmask_set, NULL))
93 #else
94 #ifdef USG
96 #define sigunblock(sig)
98 #else
100 #define sigunblock(SIG) \
101 { SIGMASKTYPE omask = sigblock (SIGEMPTYMASK); sigsetmask (omask & ~SIG); }
103 #endif /* ! defined (USG) */
104 #endif /* ! defined (USG5_4) */
105 #endif /* ! defined (POSIX_SIGNALS) */
107 #ifndef SIGMASKTYPE
108 #define SIGMASKTYPE int
109 #endif
111 #ifndef SIGEMPTYMASK
112 #define SIGEMPTYMASK (0)
113 #endif
115 #ifndef SIGFULLMASK
116 #define SIGFULLMASK (0xffffffff)
117 #endif
119 #ifndef sigmask
120 #define sigmask(no) (1L << ((no) - 1))
121 #endif
123 #ifndef sigunblock
124 #define sigunblock(SIG) \
125 { SIGMASKTYPE omask = sigblock (SIGFULLMASK); sigsetmask (omask & ~SIG); }
126 #endif
128 #ifndef BSD4_1
129 #define sigfree() sigsetmask (SIGEMPTYMASK)
130 #endif /* not BSD4_1 */
132 #if defined (SIGINFO) && defined (BROKEN_SIGINFO)
133 #undef SIGINFO
134 #endif
135 #if defined (SIGIO) && defined (BROKEN_SIGIO)
136 #undef SIGIO
137 #endif
138 #if defined (SIGPOLL) && defined (BROKEN_SIGPOLL)
139 #undef SIGPOLL
140 #endif
141 #if defined (SIGTSTP) && defined (BROKEN_SIGTSTP)
142 #undef SIGTSTP
143 #endif
144 #if defined (SIGURG) && defined (BROKEN_SIGURG)
145 #undef SIGURG
146 #endif
148 #if NSIG < NSIG_MINIMUM
149 # ifdef NSIG
150 # undef NSIG
151 # endif
152 # define NSIG NSIG_MINIMUM
153 #endif
155 #ifdef BSD4_1
156 #define SIGIO SIGTINT
157 /* sigfree is in sysdep.c */
158 #endif /* BSD4_1 */
160 /* On bsd, [man says] kill does not accept a negative number to kill a pgrp.
161 Must do that using the killpg call. */
162 #ifdef BSD_SYSTEM
163 #define EMACS_KILLPG(gid, signo) (killpg ( (gid), (signo)))
164 #else
165 #ifdef WINDOWSNT
166 #define EMACS_KILLPG(gid, signo) (kill (gid, signo))
167 #else
168 #define EMACS_KILLPG(gid, signo) (kill (-(gid), (signo)))
169 #endif
170 #endif
172 /* Define SIGCHLD as an alias for SIGCLD. There are many conditionals
173 testing SIGCHLD. */
174 #ifndef VMS
175 #ifdef SIGCLD
176 #ifndef SIGCHLD
177 #define SIGCHLD SIGCLD
178 #endif /* SIGCHLD */
179 #endif /* ! defined (SIGCLD) */
180 #endif /* VMS */
182 #ifndef HAVE_STRSIGNAL
183 /* strsignal is in sysdep.c */
184 char *strsignal ();
185 #endif