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