code.delx.au - gnu-emacs/blob - src/syssignal.h

   1 /* syssignal.h - System-dependent definitions for signals.
   2    Copyright (C) 1992 Free Software Foundation, Inc.
   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
  21 #define SIGMASKTYPE sigset_t
  22
  23 #define SIGEMPTYMASK (empty_mask)
  24 #define SIGFULLMASK (full_mask)
  25 extern sigset_t empty_mask, full_mask, temp_mask;
  26
  27 #define sigmask(SIG) \
  28 (sigemptyset (&temp_mask), sigaddset (&temp_mask, SIG), temp_mask)
  29
  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
  40
  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);
  46
  47 #define sys_sigdel(MASK,SIG) sigdelset(&MASK,SIG)
  48
  49 #else /* not POSIX_SIGNALS */
  50
  51 #define sigunblock(SIG) \
  52 { SIGMASKTYPE omask = sigblock (SIGEMPTYMASK); sigsetmask (omask & ~SIG); }
  53
  54 #endif /* not POSIX_SIGNALS */
  55
  56 #ifndef SIGMASKTYPE
  57 #define SIGMASKTYPE int
  58 #endif
  59
  60 #ifndef SIGEMPTYMASK
  61 #define SIGEMPTYMASK 0
  62 #endif
  63
  64 #ifndef sigmask
  65 #define sigmask(no) (1L << ((no) - 1))
  66 #endif
  67
  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 */
  75
  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 */
  83
  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
  91
  92 /* Define SIGCHLD as an alias for SIGCLD.  There are many conditionals
  93    testing SIGCHLD.  */
  94
  95 #ifndef VMS
  96 #ifdef SIGCLD
  97 #ifndef SIGCHLD
  98 #define SIGCHLD SIGCLD
  99 #endif /* not SIGCHLD */
 100 #endif /* SIGCLD */
 101 #endif /* not VMS */