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 #ifndef sigpause
  53 #define sigpause(SIG)    sys_sigpause (SIG)
  54 #else
  55 /* If sigpause is predefined, with POSIX_SIGNALS,
  56    let's assume it needs this kind of argument.
  57    This is true for Glibc 2.1.  */
  58 #undef SIGEMPTYMASK
  59 #define SIGEMPTYMASK sigmask (0)
  60 #endif
  61
  62 #define sigblock(SIG)    sys_sigblock (SIG)
  63 #define sigunblock(SIG)  sys_sigunblock (SIG)
  64 #ifndef sigsetmask
  65 #define sigsetmask(SIG)  sys_sigsetmask (SIG)
  66 #endif
  67 #define sighold(SIG)     ONLY_USED_IN_BSD_4_1
  68 #define sigrelse(SIG)    ONLY_USED_IN_BSD_4_1
  69 #undef signal
  70 #define signal(SIG,ACT)      sys_signal(SIG,ACT)
  71
  72 /* Whether this is what all systems want or not, this is what
  73    appears to be assumed in the source, for example data.c:arith_error.  */
  74 typedef RETSIGTYPE (*signal_handler_t) (/*int*/);
  75
  76 signal_handler_t sys_signal (/*int signal_number, signal_handler_t action*/);
  77 int      sys_sigpause   (/*sigset_t new_mask*/);
  78 sigset_t sys_sigblock   (/*sigset_t new_mask*/);
  79 sigset_t sys_sigunblock (/*sigset_t new_mask*/);
  80 sigset_t sys_sigsetmask (/*sigset_t new_mask*/);
  81
  82 #define sys_sigdel(MASK,SIG) sigdelset (&MASK,SIG)
  83
  84 #else /* ! defined (POSIX_SIGNALS) */
  85 #ifdef USG5_4
  86
  87 #ifndef sigblock
  88 #define sigblock(sig) (sigprocmask (SIG_BLOCK, SIGEMPTYMASK | sig, NULL))
  89 #endif
  90
  91 #define sigunblock(sig) (sigprocmask (SIG_SETMASK, SIGFULLMASK & ~(sig), NULL))
  92
  93 #else
  94 #ifdef USG
  95
  96 #define sigunblock(sig)
  97
  98 #else
  99
 100 #define sigunblock(SIG) \
 101 { SIGMASKTYPE omask = sigblock (SIGEMPTYMASK); sigsetmask (omask & ~SIG); }
 102
 103 #endif /* ! defined (USG) */
 104 #endif /* ! defined (USG5_4) */
 105 #endif /* ! defined (POSIX_SIGNALS) */
 106
 107 #ifndef SIGMASKTYPE
 108 #define SIGMASKTYPE int
 109 #endif
 110
 111 #ifndef SIGEMPTYMASK
 112 #define SIGEMPTYMASK (0)
 113 #endif
 114
 115 #ifndef SIGFULLMASK
 116 #define SIGFULLMASK (0xffffffff)
 117 #endif
 118
 119 #ifndef sigmask
 120 #define sigmask(no) (1L << ((no) - 1))
 121 #endif
 122
 123 #ifndef sigunblock
 124 #define sigunblock(SIG) \
 125 { SIGMASKTYPE omask = sigblock (SIGFULLMASK); sigsetmask (omask & ~SIG); }
 126 #endif
 127
 128 #ifndef BSD4_1
 129 #define sigfree() sigsetmask (SIGEMPTYMASK)
 130 #endif /* not BSD4_1 */
 131
 132 #ifdef BSD4_1
 133 #define SIGIO SIGTINT
 134 /* sigfree is in sysdep.c */
 135 #endif /* BSD4_1 */
 136
 137 /* On bsd, [man says] kill does not accept a negative number to kill a pgrp.
 138    Must do that using the killpg call.  */
 139 #ifdef BSD_SYSTEM
 140 #define EMACS_KILLPG(gid, signo) (killpg ( (gid), (signo)))
 141 #else
 142 #ifdef WINDOWSNT
 143 #define EMACS_KILLPG(gid, signo) (kill (gid, signo))
 144 #else
 145 #define EMACS_KILLPG(gid, signo) (kill   (-(gid), (signo)))
 146 #endif
 147 #endif
 148
 149 /* Define SIGCHLD as an alias for SIGCLD.  There are many conditionals
 150    testing SIGCHLD.  */
 151 #ifndef VMS
 152 #ifdef SIGCLD
 153 #ifndef SIGCHLD
 154 #define SIGCHLD SIGCLD
 155 #endif /* SIGCHLD */
 156 #endif /* ! defined (SIGCLD) */
 157 #endif /* VMS */