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