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- /* syssignal.h - System-dependent definitions for signals.
- Copyright (C) 1993 Free Software Foundation, Inc.
-
- This file is part of GNU Emacs.
-
- GNU Emacs is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 1, or (at your option)
- any later version.
-
- GNU Emacs is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with GNU Emacs; see the file COPYING. If not, write to
- the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
-
- #ifdef POSIX_SIGNALS
-
- /* Don't #include <signal.h>. That header shouldalways be #included
- before "config.h", because some configuration files (like s/hpux.h)
- indicate that SIGIO doesn't work by #undef-ing SIGIO. If this file
- #includes <signal.h>, then that will re-#define SIGIO and confuse
- things. */
-
- #define SIGMASKTYPE sigset_t
-
- #define SIGEMPTYMASK (empty_mask)
- #define SIGFULLMASK (full_mask)
- extern sigset_t empty_mask, full_mask, temp_mask;
-
- /* POSIX pretty much destroys any possibility of writing sigmask as a
- macro in standard C. */
- #ifndef sigmask
- #ifdef __GNUC__
- #define sigmask(SIG) \
- ({ \
- sigset_t _mask; \
- sigemptyset (&_mask); \
- sigaddset (&_mask, SIG); \
- _mask; \
- })
- #else /* ! defined (__GNUC__) */
- extern sigset_t sys_sigmask ();
- #define sigmask(SIG) (sys_sigmask (SIG))
- #endif /* ! defined (__GNUC__) */
- #endif
-
- #define sigpause(SIG) sys_sigpause(SIG)
- #define sigblock(SIG) sys_sigblock(SIG)
- #define sigunblock(SIG) sys_sigunblock(SIG)
- #define sigsetmask(SIG) sys_sigsetmask(SIG)
- #define sighold(SIG) ONLY_USED_IN_BSD_4_1
- #define sigrelse(SIG) ONLY_USED_IN_BSD_4_1
-
- /* Whether this is what all systems want or not, this is what
- appears to be assumed in the source, for example data.c:arith_error() */
- typedef RETSIGTYPE (*signal_handler_t) (int);
-
- signal_handler_t sys_signal (int signal_number, signal_handler_t action);
- int sys_sigpause (sigset_t new_mask);
- sigset_t sys_sigblock (sigset_t new_mask);
- sigset_t sys_sigunblock (sigset_t new_mask);
- sigset_t sys_sigsetmask (sigset_t new_mask);
-
- #define sys_sigdel(MASK,SIG) sigdelset(&MASK,SIG)
-
- #else /* ! defined (POSIX_SIGNALS) */
- #ifdef USG5_4
-
- #define sigunblock(sig) (sigprocmask(SIG_SETMASK, SIGFULLMASK & ~(sig), NULL))
-
- #else
- #ifdef USG
-
- #define sigunblock(sig)
-
- #else
-
- #define sigunblock(SIG) \
- { SIGMASKTYPE omask = sigblock (SIGEMPTYMASK); sigsetmask (omask & ~SIG); }
-
- #endif /* ! defined (USG) */
- #endif /* ! defined (USG5_4) */
- #endif /* ! defined (POSIX_SIGNALS) */
-
- #ifndef SIGMASKTYPE
- #define SIGMASKTYPE int
- #endif
-
- #ifndef SIGEMPTYMASK
- #define SIGEMPTYMASK (0)
- #endif
-
- #ifndef SIGFULLMASK
- #define SIGFULLMASK (0xffffffff)
- #endif
-
- #ifndef sigmask
- #define sigmask(no) (1L << ((no) - 1))
- #endif
-
- #ifndef sigunblock
- #define sigunblock(SIG) \
- { SIGMASKTYPE omask = sigblock (SIGFULLMASK); sigsetmask (omask & ~SIG); }
- #endif
-
- /* It would be very nice if we could somehow clean up all this trash. */
-
- #ifndef BSD4_1
- #define sigfree() sigsetmask (SIGEMPTYMASK)
- #define sigholdx(sig) sigsetmask (sigmask (sig))
- #define sigblockx(sig) sigblock (sigmask (sig))
- #define sigunblockx(sig) sigblock (SIGEMPTYMASK)
- #define sigpausex(sig) sigpause (0)
- #endif /* BSD4_1 */
-
- #ifdef BSD4_1
- #define SIGIO SIGTINT
- /* sigfree and sigholdx are in sysdep.c */
- #define sigblockx(sig) sighold (sig)
- #define sigunblockx(sig) sigrelse (sig)
- #define sigpausex(sig) sigpause (sig)
- #endif /* ! defined (BSD4_1) */
-
- /* On bsd, [man says] kill does not accept a negative number to kill a pgrp.
- Must do that using the killpg call. */
- #ifdef BSD
- #define EMACS_KILLPG(gid, signo) (killpg ( (gid), (signo)))
- #else
- #define EMACS_KILLPG(gid, signo) (kill (-(gid), (signo)))
- #endif
-
- /* Define SIGCHLD as an alias for SIGCLD. There are many conditionals
- testing SIGCHLD. */
- #ifndef VMS
- #ifdef SIGCLD
- #ifndef SIGCHLD
- #define SIGCHLD SIGCLD
- #endif /* SIGCHLD */
- #endif /* ! defined (SIGCLD) */
- #endif /* VMS */
-