code.delx.au - gnu-emacs/blob - 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;
  34
  35 /* POSIX pretty much destroys any possibility of writing sigmask as a
  36    macro in standard C.  We always define our own version because the
  37    predefined macro in Glibc 2.1 is only provided for compatility for old
  38    programs that use int as signal mask type.  */
  39 #undef sigmask
  40 #ifdef __GNUC__
  41 #define sigmask(SIG)                            \
  42   ({                                            \
  43     sigset_t _mask;                             \
  44     sigemptyset (&_mask);                       \
  45     sigaddset (&_mask, SIG);                    \
  46     _mask;                                      \
  47   })
  48 #else /* ! defined (__GNUC__) */
  49 extern sigset_t sys_sigmask ();
  50 #define sigmask(SIG) (sys_sigmask (SIG))
  51 #endif /* ! defined (__GNUC__) */
  52
  53 #undef sigpause
  54 #define sigpause(MASK)    sigsuspend (&(MASK))
  55
  56 #define sigblock(SIG)    sys_sigblock (SIG)
  57 #define sigunblock(SIG)  sys_sigunblock (SIG)
  58 #ifndef sigsetmask
  59 #define sigsetmask(SIG)  sys_sigsetmask (SIG)
  60 #endif
  61 #define sighold(SIG)     ONLY_USED_IN_BSD_4_1
  62 #define sigrelse(SIG)    ONLY_USED_IN_BSD_4_1
  63 #undef signal
  64 #define signal(SIG,ACT)      sys_signal(SIG,ACT)
  65
  66 /* Whether this is what all systems want or not, this is what
  67    appears to be assumed in the source, for example data.c:arith_error.  */
  68 typedef RETSIGTYPE (*signal_handler_t) (/*int*/);
  69
  70 signal_handler_t sys_signal (/*int signal_number, signal_handler_t action*/);
  71 sigset_t sys_sigblock   (/*sigset_t new_mask*/);
  72 sigset_t sys_sigunblock (/*sigset_t new_mask*/);
  73 sigset_t sys_sigsetmask (/*sigset_t new_mask*/);
  74
  75 #define sys_sigdel(MASK,SIG) sigdelset (&MASK,SIG)
  76
  77 #else /* ! defined (POSIX_SIGNALS) */
  78 #ifdef USG5_4
  79
  80 #ifndef sigblock
  81 #define sigblock(sig) (sigprocmask (SIG_BLOCK, SIGEMPTYMASK | sig, NULL))
  82 #endif
  83
  84 #define sigunblock(sig) (sigprocmask (SIG_SETMASK, SIGFULLMASK & ~(sig), NULL))
  85
  86 #else
  87 #ifdef USG
  88
  89 #define sigunblock(sig)
  90
  91 #else
  92
  93 #define sigunblock(SIG) \
  94 { SIGMASKTYPE omask = sigblock (SIGEMPTYMASK); sigsetmask (omask & ~SIG); }
  95
  96 #endif /* ! defined (USG) */
  97 #endif /* ! defined (USG5_4) */
  98 #endif /* ! defined (POSIX_SIGNALS) */
  99
 100 #ifndef SIGMASKTYPE
 101 #define SIGMASKTYPE int
 102 #endif
 103
 104 #ifndef SIGEMPTYMASK
 105 #define SIGEMPTYMASK (0)
 106 #endif
 107
 108 #ifndef SIGFULLMASK
 109 #define SIGFULLMASK (0xffffffff)
 110 #endif
 111
 112 #ifndef sigmask
 113 #define sigmask(no) (1L << ((no) - 1))
 114 #endif
 115
 116 #ifndef sigunblock
 117 #define sigunblock(SIG) \
 118 { SIGMASKTYPE omask = sigblock (SIGFULLMASK); sigsetmask (omask & ~SIG); }
 119 #endif
 120
 121 #ifndef BSD4_1
 122 #define sigfree() sigsetmask (SIGEMPTYMASK)
 123 #endif /* not BSD4_1 */
 124
 125 #ifdef BSD4_1
 126 #define SIGIO SIGTINT
 127 /* sigfree is in sysdep.c */
 128 #endif /* BSD4_1 */
 129
 130 /* On bsd, [man says] kill does not accept a negative number to kill a pgrp.
 131    Must do that using the killpg call.  */
 132 #ifdef BSD_SYSTEM
 133 #define EMACS_KILLPG(gid, signo) (killpg ( (gid), (signo)))
 134 #else
 135 #ifdef WINDOWSNT
 136 #define EMACS_KILLPG(gid, signo) (kill (gid, signo))
 137 #else
 138 #define EMACS_KILLPG(gid, signo) (kill   (-(gid), (signo)))
 139 #endif
 140 #endif
 141
 142 /* Define SIGCHLD as an alias for SIGCLD.  There are many conditionals
 143    testing SIGCHLD.  */
 144 #ifndef VMS
 145 #ifdef SIGCLD
 146 #ifndef SIGCHLD
 147 #define SIGCHLD SIGCLD
 148 #endif /* SIGCHLD */
 149 #endif /* ! defined (SIGCLD) */
 150 #endif /* VMS */