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 /* POSIX pretty much destroys any possibility of writing sigmask as a
  28    macro in standard C.  */
  29 #ifdef __GNUC__
  30 #define sigmask(SIG)                            \
  31   ({                                            \
  32     sigset_t _mask;                             \
  33     sigemptyset (&_mask);                       \
  34     sigaddset (&_mask, SIG);                    \
  35     _mask;                                      \
  36   })
  37 #else
  38 #define sigmask(SIG) (sys_sigmask (SIG))
  39 #endif
  40
  41 #define sigpause(SIG)    sys_sigpause(SIG)
  42 #define sigblock(SIG)    sys_sigblock(SIG)
  43 #define sigunblock(SIG)  sys_sigunblock(SIG)
  44 #define sigsetmask(SIG)  sys_sigsetmask(SIG)
  45 #define sighold(SIG)     ONLY_USED_IN_BSD_4_1
  46 #define sigrelse(SIG)    ONLY_USED_IN_BSD_4_1
  47
  48 int (*sys_signal (int signal_number, int (*action)())) ();
  49 int sys_sigpause (int signal_number);
  50 sigset_t sys_sigblock (sigset_t new_mask);
  51 sigset_t sys_sigunblock (sigset_t new_mask);
  52 sigset_t sys_sigsetmask (sigset_t new_mask);
  53
  54 #define sys_sigdel(MASK,SIG) sigdelset(&MASK,SIG)
  55
  56 #else /* not POSIX_SIGNALS */
  57
  58 #define sigunblock(SIG) \
  59 { SIGMASKTYPE omask = sigblock (SIGEMPTYMASK); sigsetmask (omask & ~SIG); }
  60
  61 #endif /* not POSIX_SIGNALS */
  62
  63 #ifndef SIGMASKTYPE
  64 #define SIGMASKTYPE int
  65 #endif
  66
  67 #ifndef SIGEMPTYMASK
  68 #define SIGEMPTYMASK (0)
  69 #endif
  70
  71 #ifndef SIGFULLMASK
  72 #define SIGFULLMASK (0xffffffff)
  73 #endif
  74
  75 #ifndef sigmask
  76 #define sigmask(no) (1L << ((no) - 1))
  77 #endif
  78
  79 #ifndef sigunblock
  80 #define sigunblock(SIG) \
  81 { SIGMASKTYPE omask = sigblock (SIGFULLMASK); sigsetmask (omask & ~SIG); }
  82 #endif
  83
  84 /* It would be very nice if we could somehow clean up all this trash.  */
  85
  86 #ifndef BSD4_1
  87 #define sigfree() sigsetmask (SIGEMPTYMASK)
  88 #define sigholdx(sig) sigsetmask (sigmask (sig))
  89 #define sigblockx(sig) sigblock (sigmask (sig))
  90 #define sigunblockx(sig) sigblock (SIGEMPTYMASK)
  91 #define sigpausex(sig) sigpause (0)
  92 #endif /* not BSD4_1 */
  93
  94 #ifdef BSD4_1
  95 #define SIGIO SIGTINT
  96 /* sigfree and sigholdx are in sysdep.c */
  97 #define sigblockx(sig) sighold (sig)
  98 #define sigunblockx(sig) sigrelse (sig)
  99 #define sigpausex(sig) sigpause (sig)
 100 #endif /* BSD4_1 */
 101
 102 /* On bsd, [man says] kill does not accept a negative number to kill a pgrp.
 103    Must do that using the killpg call.  */
 104 #ifdef BSD
 105 #define EMACS_KILLPG(gid, signo) (killpg ( (gid), (signo)))
 106 #else
 107 #define EMACS_KILLPG(gid, signo) (kill   (-(gid), (signo)))
 108 #endif
 109
 110 /* Define SIGCHLD as an alias for SIGCLD.  There are many conditionals
 111    testing SIGCHLD.  */
 112 #ifndef VMS
 113 #ifdef SIGCLD
 114 #ifndef SIGCHLD
 115 #define SIGCHLD SIGCLD
 116 #endif /* not SIGCHLD */
 117 #endif /* SIGCLD */
 118 #endif /* not VMS */