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[emacs.git] / src / syssignal.h
blob81d52c8f758a3251fda851cc636972ab7c4c7206
1 /* syssignal.h - System-dependent definitions for signals.
2 Copyright (C) 1992 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 1, 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, 675 Mass Ave, Cambridge, MA 02139, USA. */
20 #ifdef POSIX_SIGNALS
21 #define SIGMASKTYPE sigset_t
23 #define SIGEMPTYMASK (empty_mask)
24 #define SIGFULLMASK (full_mask)
25 extern sigset_t empty_mask, full_mask, temp_mask;
27 #define sigmask(SIG) \
28 (sigemptyset (&temp_mask), sigaddset (&temp_mask, SIG), temp_mask)
30 /* May need a local mask. There could be problems if code using any
31 of the 3 macros below could be reentered due to a signal occurring.
32 This can't happen in Emacs 18.57, so we don't worry. - DJB
33 These macros also require GCC. */
34 #define sigpause(SIG) ({ sigset_t _mask; sys_sigpause(SIG); })
35 #define sigblock(SIG) ({ sigset_t _mask; sys_sigblock(SIG); })
36 #define sigunblock(SIG) ({ sigset_t _mask; sys_sigunblock(SIG); })
37 #define sigsetmask(SIG) ({ sigset_t _mask; sys_sigsetmask(SIG); })
38 #define sighold(SIG) ONLY_USED_IN_BSD_4_1
39 #define sigrelse(SIG) ONLY_USED_IN_BSD_4_1
41 int (*sys_signal (int signal_number, int (*action)())) ();
42 int sys_sigpause (int signal_number);
43 sigset_t sys_sigblock (sigset_t new_mask);
44 sigset_t sys_sigunblock (sigset_t new_mask);
45 sigset_t sys_sigsetmask (sigset_t new_mask);
47 #define sys_sigdel(MASK,SIG) sigdelset(&MASK,SIG)
49 #else /* not POSIX_SIGNALS */
51 #define sigunblock(SIG) \
52 { SIGMASKTYPE omask = sigblock (SIGEMPTYMASK); sigsetmask (omask & ~SIG); }
54 #endif /* not POSIX_SIGNALS */
56 #ifndef SIGMASKTYPE
57 #define SIGMASKTYPE int
58 #endif
60 #ifndef SIGEMPTYMASK
61 #define SIGEMPTYMASK 0
62 #endif
64 #ifndef sigmask
65 #define sigmask(no) (1L << ((no) - 1))
66 #endif
68 #ifndef BSD4_1
69 #define sigfree() sigsetmask (SIGEMPTYMASK)
70 #define sigholdx(sig) sigsetmask (sigmask (sig))
71 #define sigblockx(sig) sigblock (sigmask (sig))
72 #define sigunblockx(sig) sigblock (SIGEMPTYMASK)
73 #define sigpausex(sig) sigpause (0)
74 #endif /* not BSD4_1 */
76 #ifdef BSD4_1
77 #define SIGIO SIGTINT
78 /* sigfree and sigholdx are in sysdep.c */
79 #define sigblockx(sig) sighold (sig)
80 #define sigunblockx(sig) sigrelse (sig)
81 #define sigpausex(sig) sigpause (sig)
82 #endif /* BSD4_1 */
84 /* On bsd, [man says] kill does not accept a negative number to kill a pgrp.
85 Must do that using the killpg call. */
86 #ifdef BSD
87 #define EMACS_KILLPG(gid, signo) (killpg ( (gid), (signo)))
88 #else
89 #define EMACS_KILLPG(gid, signo) (kill (-(gid), (signo)))
90 #endif
92 /* Define SIGCHLD as an alias for SIGCLD. There are many conditionals
93 testing SIGCHLD. */
95 #ifndef VMS
96 #ifdef SIGCLD
97 #ifndef SIGCHLD
98 #define SIGCHLD SIGCLD
99 #endif /* not SIGCHLD */
100 #endif /* SIGCLD */
101 #endif /* not VMS */