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 2, 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, Inc., 59 Temple Place - Suite 330,
  19 Boston, MA 02111-1307, USA.  */
  20
  21 #ifdef POSIX_SIGNALS
  22
  23 /* Don't #include <signal.h>.  That header should always be #included
  24    before "config.h", because some configuration files (like s/hpux.h)
  25    indicate that SIGIO doesn't work by #undef-ing SIGIO.  If this file
  26    #includes <signal.h>, then that will re-#define SIGIO and confuse
  27    things.  */
  28
  29 #define SIGMASKTYPE sigset_t
  30
  31 #define SIGEMPTYMASK (empty_mask)
  32 #define SIGFULLMASK (full_mask)
  33 extern sigset_t empty_mask, full_mask, temp_mask;
  34
  35 /* POSIX pretty much destroys any possibility of writing sigmask as a
  36    macro in standard C.  */
  37 #ifndef sigmask
  38 #ifdef __GNUC__
  39 #define sigmask(SIG)                            \
  40   ({                                            \
  41     sigset_t _mask;                             \
  42     sigemptyset (&_mask);                       \
  43     sigaddset (&_mask, SIG);                    \
  44     _mask;                                      \
  45   })
  46 #else /* ! defined (__GNUC__) */
  47 extern sigset_t sys_sigmask ();
  48 #define sigmask(SIG) (sys_sigmask (SIG))
  49 #endif /* ! defined (__GNUC__) */
  50 #endif
  51
  52 #define sigpause(SIG)    sys_sigpause (SIG)
  53 #define sigblock(SIG)    sys_sigblock (SIG)
  54 #define sigunblock(SIG)  sys_sigunblock (SIG)
  55 #ifndef sigsetmask
  56 #define sigsetmask(SIG)  sys_sigsetmask (SIG)
  57 #endif
  58 #define sighold(SIG)     ONLY_USED_IN_BSD_4_1
  59 #define sigrelse(SIG)    ONLY_USED_IN_BSD_4_1
  60 #undef signal
  61 #define signal(SIG,ACT)      sys_signal(SIG,ACT)
  62
  63 /* Whether this is what all systems want or not, this is what
  64    appears to be assumed in the source, for example data.c:arith_error.  */
  65 typedef RETSIGTYPE (*signal_handler_t) (/*int*/);
  66
  67 signal_handler_t sys_signal (/*int signal_number, signal_handler_t action*/);
  68 int      sys_sigpause   (/*sigset_t new_mask*/);
  69 sigset_t sys_sigblock   (/*sigset_t new_mask*/);
  70 sigset_t sys_sigunblock (/*sigset_t new_mask*/);
  71 sigset_t sys_sigsetmask (/*sigset_t new_mask*/);
  72
  73 #define sys_sigdel(MASK,SIG) sigdelset (&MASK,SIG)
  74
  75 #else /* ! defined (POSIX_SIGNALS) */
  76 #ifdef USG5_4
  77
  78 #ifndef sigblock
  79 #define sigblock(sig) (sigprocmask (SIG_BLOCK, SIGEMPTYMASK | sig, NULL))
  80 #endif
  81
  82 #define sigunblock(sig) (sigprocmask (SIG_SETMASK, SIGFULLMASK & ~(sig), NULL))
  83
  84 #else
  85 #ifdef USG
  86
  87 #define sigunblock(sig)
  88
  89 #else
  90
  91 #define sigunblock(SIG) \
  92 { SIGMASKTYPE omask = sigblock (SIGEMPTYMASK); sigsetmask (omask & ~SIG); }
  93
  94 #endif /* ! defined (USG) */
  95 #endif /* ! defined (USG5_4) */
  96 #endif /* ! defined (POSIX_SIGNALS) */
  97
  98 #ifndef SIGMASKTYPE
  99 #define SIGMASKTYPE int
 100 #endif
 101
 102 #ifndef SIGEMPTYMASK
 103 #define SIGEMPTYMASK (0)
 104 #endif
 105
 106 #ifndef SIGFULLMASK
 107 #define SIGFULLMASK (0xffffffff)
 108 #endif
 109
 110 #ifndef sigmask
 111 #define sigmask(no) (1L << ((no) - 1))
 112 #endif
 113
 114 #ifndef sigunblock
 115 #define sigunblock(SIG) \
 116 { SIGMASKTYPE omask = sigblock (SIGFULLMASK); sigsetmask (omask & ~SIG); }
 117 #endif
 118
 119 #ifndef BSD4_1
 120 #define sigfree() sigsetmask (SIGEMPTYMASK)
 121 #endif /* not BSD4_1 */
 122
 123 #ifdef BSD4_1
 124 #define SIGIO SIGTINT
 125 /* sigfree is in sysdep.c */
 126 #endif /* BSD4_1 */
 127
 128 /* On bsd, [man says] kill does not accept a negative number to kill a pgrp.
 129    Must do that using the killpg call.  */
 130 #ifdef BSD_SYSTEM
 131 #define EMACS_KILLPG(gid, signo) (killpg ( (gid), (signo)))
 132 #else
 133 #ifdef WINDOWSNT
 134 #define EMACS_KILLPG(gid, signo) (kill (gid, signo))
 135 #else
 136 #define EMACS_KILLPG(gid, signo) (kill   (-(gid), (signo)))
 137 #endif
 138 #endif
 139
 140 /* Define SIGCHLD as an alias for SIGCLD.  There are many conditionals
 141    testing SIGCHLD.  */
 142 #ifndef VMS
 143 #ifdef SIGCLD
 144 #ifndef SIGCHLD
 145 #define SIGCHLD SIGCLD
 146 #endif /* SIGCHLD */
 147 #endif /* ! defined (SIGCLD) */
 148 #endif /* VMS */