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