*** empty log message ***
[emacs.git] / src / syssignal.h
blob2ea83b68b902d414e280f43975e0d1b9f6e88e1e
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 #ifndef sigunblock
90 #define sigunblock(sig) \
91 (sigprocmask_set = SIGFULLMASK & ~(sig), \
92 sigprocmask (SIG_SETMASK, &sigprocmask_set, NULL))
93 #endif
95 #else
96 #ifdef USG
98 #ifndef sigunblock
99 #define sigunblock(sig)
100 #endif
102 #else
104 #ifndef sigunblock
105 #define sigunblock(SIG) \
106 { SIGMASKTYPE omask = sigblock (SIGEMPTYMASK); sigsetmask (omask & ~SIG); }
107 #endif
109 #endif /* ! defined (USG) */
110 #endif /* ! defined (USG5_4) */
111 #endif /* ! defined (POSIX_SIGNALS) */
113 #ifndef SIGMASKTYPE
114 #define SIGMASKTYPE int
115 #endif
117 #ifndef SIGEMPTYMASK
118 #define SIGEMPTYMASK (0)
119 #endif
121 #ifndef SIGFULLMASK
122 #define SIGFULLMASK (0xffffffff)
123 #endif
125 #ifndef sigmask
126 #define sigmask(no) (1L << ((no) - 1))
127 #endif
129 #ifndef sigunblock
130 #define sigunblock(SIG) \
131 { SIGMASKTYPE omask = sigblock (SIGFULLMASK); sigsetmask (omask & ~SIG); }
132 #endif
134 #ifndef BSD4_1
135 #define sigfree() sigsetmask (SIGEMPTYMASK)
136 #endif /* not BSD4_1 */
138 #if defined (SIGINFO) && defined (BROKEN_SIGINFO)
139 #undef SIGINFO
140 #endif
141 #if defined (SIGIO) && defined (BROKEN_SIGIO)
142 #undef SIGIO
143 #endif
144 #if defined (SIGPOLL) && defined (BROKEN_SIGPOLL)
145 #undef SIGPOLL
146 #endif
147 #if defined (SIGTSTP) && defined (BROKEN_SIGTSTP)
148 #undef SIGTSTP
149 #endif
150 #if defined (SIGURG) && defined (BROKEN_SIGURG)
151 #undef SIGURG
152 #endif
153 #if defined (SIGAIO) && defined (BROKEN_SIGAIO)
154 #undef SIGAIO
155 #endif
156 #if defined (SIGPTY) && defined (BROKEN_SIGPTY)
157 #undef SIGPTY
158 #endif
161 #if NSIG < NSIG_MINIMUM
162 # ifdef NSIG
163 # undef NSIG
164 # endif
165 # define NSIG NSIG_MINIMUM
166 #endif
168 #ifdef BSD4_1
169 #define SIGIO SIGTINT
170 /* sigfree is in sysdep.c */
171 #endif /* BSD4_1 */
173 /* On bsd, [man says] kill does not accept a negative number to kill a pgrp.
174 Must do that using the killpg call. */
175 #ifdef BSD_SYSTEM
176 #define EMACS_KILLPG(gid, signo) (killpg ( (gid), (signo)))
177 #else
178 #ifdef WINDOWSNT
179 #define EMACS_KILLPG(gid, signo) (kill (gid, signo))
180 #else
181 #define EMACS_KILLPG(gid, signo) (kill (-(gid), (signo)))
182 #endif
183 #endif
185 /* Define SIGCHLD as an alias for SIGCLD. There are many conditionals
186 testing SIGCHLD. */
187 #ifndef VMS
188 #ifdef SIGCLD
189 #ifndef SIGCHLD
190 #define SIGCHLD SIGCLD
191 #endif /* SIGCHLD */
192 #endif /* ! defined (SIGCLD) */
193 #endif /* VMS */
195 #ifndef HAVE_STRSIGNAL
196 /* strsignal is in sysdep.c */
197 char *strsignal ();
198 #endif