src/syssignal.h

   1 /* syssignal.h - System-dependent definitions for signals.
   2    Copyright (C) 1993 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
  22 /* Don't #include <signal.h>.  That header shouldalways be #included
  23    before "config.h", because some configuration files (like s/hpux.h)
  24    indicate that SIGIO doesn't work by #undef-ing SIGIO.  If this file
  25    #includes <signal.h>, then that will re-#define SIGIO and confuse
  26    things.  */
  27
  28 #define SIGMASKTYPE sigset_t
  29
  30 #define SIGEMPTYMASK (empty_mask)
  31 #define SIGFULLMASK (full_mask)
  32 extern sigset_t empty_mask, full_mask, temp_mask;
  33
  34 /* POSIX pretty much destroys any possibility of writing sigmask as a
  35    macro in standard C.  */
  36 #ifndef sigmask
  37 #ifdef __GNUC__
  38 #define sigmask(SIG)                            \
  39   ({                                            \
  40     sigset_t _mask;                             \
  41     sigemptyset (&_mask);                       \
  42     sigaddset (&_mask, SIG);                    \
  43     _mask;                                      \
  44   })
  45 #else /* ! defined (__GNUC__) */
  46 #define sigmask(SIG) (sys_sigmask (SIG))
  47 #endif /* ! defined (__GNUC__) */
  48 #endif
  49
  50 #define sigpause(SIG)    sys_sigpause(SIG)
  51 #define sigblock(SIG)    sys_sigblock(SIG)
  52 #define sigunblock(SIG)  sys_sigunblock(SIG)
  53 #define sigsetmask(SIG)  sys_sigsetmask(SIG)
  54 #define sighold(SIG)     ONLY_USED_IN_BSD_4_1
  55 #define sigrelse(SIG)    ONLY_USED_IN_BSD_4_1
  56
  57 /* Whether this is what all systems want or not, this is what
  58    appears to be assumed in the source, for example data.c:arith_error() */
  59 typedef RETSIGTYPE (*signal_handler_t) (int);
  60
  61 signal_handler_t sys_signal (int signal_number, signal_handler_t action);
  62 int      sys_sigpause   (sigset_t new_mask);
  63 sigset_t sys_sigblock   (sigset_t new_mask);
  64 sigset_t sys_sigunblock (sigset_t new_mask);
  65 sigset_t sys_sigsetmask (sigset_t new_mask);
  66
  67 #define sys_sigdel(MASK,SIG) sigdelset(&MASK,SIG)
  68
  69 #else /* ! defined (POSIX_SIGNALS) */
  70 #ifdef USG5_4
  71
  72 #define sigunblock(sig) (sigprocmask(SIG_SETMASK, SIGFULLMASK & ~(sig), NULL))
  73
  74 #else
  75 #ifdef USG
  76
  77 #define sigunblock(sig)
  78
  79 #else
  80
  81 #define sigunblock(SIG) \
  82 { SIGMASKTYPE omask = sigblock (SIGEMPTYMASK); sigsetmask (omask & ~SIG); }
  83
  84 #endif /* ! defined (USG) */
  85 #endif /* ! defined (USG5_4) */
  86 #endif /* ! defined (POSIX_SIGNALS) */
  87
  88 #ifndef SIGMASKTYPE
  89 #define SIGMASKTYPE int
  90 #endif
  91
  92 #ifndef SIGEMPTYMASK
  93 #define SIGEMPTYMASK (0)
  94 #endif
  95
  96 #ifndef SIGFULLMASK
  97 #define SIGFULLMASK (0xffffffff)
  98 #endif
  99
 100 #ifndef sigmask
 101 #define sigmask(no) (1L << ((no) - 1))
 102 #endif
 103
 104 #ifndef sigunblock
 105 #define sigunblock(SIG) \
 106 { SIGMASKTYPE omask = sigblock (SIGFULLMASK); sigsetmask (omask & ~SIG); }
 107 #endif
 108
 109 /* It would be very nice if we could somehow clean up all this trash.  */
 110
 111 #ifndef BSD4_1
 112 #define sigfree() sigsetmask (SIGEMPTYMASK)
 113 #define sigholdx(sig) sigsetmask (sigmask (sig))
 114 #define sigblockx(sig) sigblock (sigmask (sig))
 115 #define sigunblockx(sig) sigblock (SIGEMPTYMASK)
 116 #define sigpausex(sig) sigpause (0)
 117 #endif /* BSD4_1 */
 118
 119 #ifdef BSD4_1
 120 #define SIGIO SIGTINT
 121 /* sigfree and sigholdx are in sysdep.c */
 122 #define sigblockx(sig) sighold (sig)
 123 #define sigunblockx(sig) sigrelse (sig)
 124 #define sigpausex(sig) sigpause (sig)
 125 #endif /* ! defined (BSD4_1) */
 126
 127 /* On bsd, [man says] kill does not accept a negative number to kill a pgrp.
 128    Must do that using the killpg call.  */
 129 #ifdef BSD
 130 #define EMACS_KILLPG(gid, signo) (killpg ( (gid), (signo)))
 131 #else
 132 #define EMACS_KILLPG(gid, signo) (kill   (-(gid), (signo)))
 133 #endif
 134
 135 /* Define SIGCHLD as an alias for SIGCLD.  There are many conditionals
 136    testing SIGCHLD.  */
 137 #ifndef VMS
 138 #ifdef SIGCLD
 139 #ifndef SIGCHLD
 140 #define SIGCHLD SIGCLD
 141 #endif /* SIGCHLD */
 142 #endif /* ! defined (SIGCLD) */
 143 #endif /* VMS */