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9ab9afa9 | 1 | /* syssignal.h - System-dependent definitions for signals. |
c6c5df7f | 2 | Copyright (C) 1993 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 | |
8 | the Free Software Foundation; either version 1, or (at your option) | |
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 | |
18 | the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */ | |
19 | ||
20 | #ifdef POSIX_SIGNALS | |
00eaaa32 | 21 | |
cf026b25 JB |
22 | /* Don't #include <signal.h>. That header shouldalways be #included |
23 | before "config.h", because some configuration files (like s/hpux.h) | |
24 | indicate that SIGIO doesn't work by #undef-ing SIGIO. If this file | |
25 | #includes <signal.h>, then that will re-#define SIGIO and confuse | |
26 | things. */ | |
00eaaa32 | 27 | |
9ab9afa9 JB |
28 | #define SIGMASKTYPE sigset_t |
29 | ||
30 | #define SIGEMPTYMASK (empty_mask) | |
31 | #define SIGFULLMASK (full_mask) | |
32 | extern sigset_t empty_mask, full_mask, temp_mask; | |
33 | ||
1b1f8f85 JB |
34 | /* POSIX pretty much destroys any possibility of writing sigmask as a |
35 | macro in standard C. */ | |
00eaaa32 | 36 | #ifndef sigmask |
1b1f8f85 JB |
37 | #ifdef __GNUC__ |
38 | #define sigmask(SIG) \ | |
39 | ({ \ | |
40 | sigset_t _mask; \ | |
41 | sigemptyset (&_mask); \ | |
42 | sigaddset (&_mask, SIG); \ | |
43 | _mask; \ | |
44 | }) | |
985a35a3 | 45 | #else /* ! defined (__GNUC__) */ |
9bd67a37 | 46 | extern sigset_t sys_sigmask (); |
1b1f8f85 | 47 | #define sigmask(SIG) (sys_sigmask (SIG)) |
985a35a3 | 48 | #endif /* ! defined (__GNUC__) */ |
00eaaa32 | 49 | #endif |
1b1f8f85 JB |
50 | |
51 | #define sigpause(SIG) sys_sigpause(SIG) | |
52 | #define sigblock(SIG) sys_sigblock(SIG) | |
53 | #define sigunblock(SIG) sys_sigunblock(SIG) | |
54 | #define sigsetmask(SIG) sys_sigsetmask(SIG) | |
9ab9afa9 JB |
55 | #define sighold(SIG) ONLY_USED_IN_BSD_4_1 |
56 | #define sigrelse(SIG) ONLY_USED_IN_BSD_4_1 | |
57 | ||
00eaaa32 JB |
58 | /* Whether this is what all systems want or not, this is what |
59 | appears to be assumed in the source, for example data.c:arith_error() */ | |
60 | typedef RETSIGTYPE (*signal_handler_t) (int); | |
61 | ||
2e903afb | 62 | signal_handler_t sys_signal (int signal_number, signal_handler_t action); |
00eaaa32 JB |
63 | int sys_sigpause (sigset_t new_mask); |
64 | sigset_t sys_sigblock (sigset_t new_mask); | |
9ab9afa9 JB |
65 | sigset_t sys_sigunblock (sigset_t new_mask); |
66 | sigset_t sys_sigsetmask (sigset_t new_mask); | |
67 | ||
68 | #define sys_sigdel(MASK,SIG) sigdelset(&MASK,SIG) | |
69 | ||
985a35a3 JB |
70 | #else /* ! defined (POSIX_SIGNALS) */ |
71 | #ifdef USG5_4 | |
72 | ||
73 | #define sigunblock(sig) (sigprocmask(SIG_SETMASK, SIGFULLMASK & ~(sig), NULL)) | |
74 | ||
75 | #else | |
76 | #ifdef USG | |
77 | ||
78 | #define sigunblock(sig) | |
79 | ||
80 | #else | |
9ab9afa9 JB |
81 | |
82 | #define sigunblock(SIG) \ | |
83 | { SIGMASKTYPE omask = sigblock (SIGEMPTYMASK); sigsetmask (omask & ~SIG); } | |
84 | ||
985a35a3 JB |
85 | #endif /* ! defined (USG) */ |
86 | #endif /* ! defined (USG5_4) */ | |
87 | #endif /* ! defined (POSIX_SIGNALS) */ | |
9ab9afa9 JB |
88 | |
89 | #ifndef SIGMASKTYPE | |
90 | #define SIGMASKTYPE int | |
91 | #endif | |
92 | ||
93 | #ifndef SIGEMPTYMASK | |
1b1f8f85 JB |
94 | #define SIGEMPTYMASK (0) |
95 | #endif | |
96 | ||
97 | #ifndef SIGFULLMASK | |
98 | #define SIGFULLMASK (0xffffffff) | |
9ab9afa9 JB |
99 | #endif |
100 | ||
101 | #ifndef sigmask | |
102 | #define sigmask(no) (1L << ((no) - 1)) | |
103 | #endif | |
104 | ||
1b1f8f85 JB |
105 | #ifndef sigunblock |
106 | #define sigunblock(SIG) \ | |
107 | { SIGMASKTYPE omask = sigblock (SIGFULLMASK); sigsetmask (omask & ~SIG); } | |
108 | #endif | |
109 | ||
110 | /* It would be very nice if we could somehow clean up all this trash. */ | |
111 | ||
112 | #ifndef BSD4_1 | |
113 | #define sigfree() sigsetmask (SIGEMPTYMASK) | |
114 | #define sigholdx(sig) sigsetmask (sigmask (sig)) | |
115 | #define sigblockx(sig) sigblock (sigmask (sig)) | |
116 | #define sigunblockx(sig) sigblock (SIGEMPTYMASK) | |
117 | #define sigpausex(sig) sigpause (0) | |
985a35a3 | 118 | #endif /* BSD4_1 */ |
1b1f8f85 | 119 | |
9ab9afa9 JB |
120 | #ifdef BSD4_1 |
121 | #define SIGIO SIGTINT | |
122 | /* sigfree and sigholdx are in sysdep.c */ | |
1b1f8f85 JB |
123 | #define sigblockx(sig) sighold (sig) |
124 | #define sigunblockx(sig) sigrelse (sig) | |
125 | #define sigpausex(sig) sigpause (sig) | |
985a35a3 | 126 | #endif /* ! defined (BSD4_1) */ |
9ab9afa9 JB |
127 | |
128 | /* On bsd, [man says] kill does not accept a negative number to kill a pgrp. | |
129 | Must do that using the killpg call. */ | |
130 | #ifdef BSD | |
131 | #define EMACS_KILLPG(gid, signo) (killpg ( (gid), (signo))) | |
132 | #else | |
133 | #define EMACS_KILLPG(gid, signo) (kill (-(gid), (signo))) | |
134 | #endif | |
135 | ||
136 | /* Define SIGCHLD as an alias for SIGCLD. There are many conditionals | |
137 | testing SIGCHLD. */ | |
9ab9afa9 JB |
138 | #ifndef VMS |
139 | #ifdef SIGCLD | |
140 | #ifndef SIGCHLD | |
141 | #define SIGCHLD SIGCLD | |
985a35a3 JB |
142 | #endif /* SIGCHLD */ |
143 | #endif /* ! defined (SIGCLD) */ | |
144 | #endif /* VMS */ |