code.delx.au - gnu-emacs/blob - src/syssignal.h

   1 /* syssignal.h - System-dependent definitions for signals.
   2    Copyright (C) 1992 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
  21 #ifdef POSIX_SIGNALS
  22 #define SIGMASKTYPE sigset_t
  23
  24 #define SIGEMPTYMASK (empty_mask)
  25 #define SIGFULLMASK (full_mask)
  26 extern sigset_t empty_mask, full_mask, temp_mask;
  27
  28 #define sigmask(SIG) \
  29 (sigemptyset (&temp_mask), sigaddset (&temp_mask, SIG), temp_mask)
  30
  31 /* The below routines may need a local mask.  There could be problems
  32    if code using any of the 3 macros below could be reentered due to a
  33    signal occurring.  This can't happen in Emacs 18.57, so we don't
  34    worry. - DJB */
  35
  36 #define EMACS_SIGPAUSE(sigset) \
  37   do { sigset_t _mask; sys_sigpause (sigset); } while (0)
  38 #define EMACS_SIGBLOCK(new_sig, old_sig) \
  39   do { sigset_t _mask; (old_sig) = sys_sigblock (new_sig); } while (0)
  40 #define EMACS_SIGUNBLOCK(new_sig, old_sig) \
  41   do { sigset_t _mask; (old_sig) = sys_sigunblock (new_sig); } while (0)
  42 #define EMACS_SIGSETMASK(new_sig, old_sig) \
  43   do { sigset_t _mask; (old_sig) = sys_sigsetmask (new_sig); } while (0)
  44 #define sighold(SIG)     ONLY_USED_IN_BSD_4_1
  45 #define sigrelse(SIG)    ONLY_USED_IN_BSD_4_1
  46
  47 int (*sys_signal (int signal_number, int (*action)())) ();
  48 int sys_sigpause (int signal_number);
  49 sigset_t sys_sigblock (sigset_t new_mask);
  50 sigset_t sys_sigunblock (sigset_t new_mask);
  51 sigset_t sys_sigsetmask (sigset_t new_mask);
  52
  53 #define sys_sigdel(MASK,SIG) sigdelset(&MASK,SIG)
  54
  55 #else /* ! defined (POSIX_SIGNALS) */
  56
  57 #define sigunblock(SIG) \
  58 { SIGMASKTYPE omask = sigblock (SIGEMPTYMASK); sigsetmask (omask & ~SIG); }
  59
  60 #endif /* ! defined (POSIX_SIGNALS) */
  61
  62 #ifndef SIGMASKTYPE
  63 #define SIGMASKTYPE int
  64 #endif
  65
  66 #ifndef SIGEMPTYMASK
  67 #define SIGEMPTYMASK 0
  68 #endif
  69
  70 #ifndef sigmask
  71 #define sigmask(no) (1L << ((no) - 1))
  72 #endif
  73
  74 #ifdef BSD4_1
  75 #define SIGIO SIGTINT
  76 /* sigfree and sigholdx are in sysdep.c */
  77 #define EMACS_SIGFREE () sigfree ()
  78
  79 /* We define the following macros to expand into statements rather
  80    than expressions, because the POSIX macros above do the same, and
  81    we don't want people on BSD4_1 systems accidentally using the
  82    macros in a way that will break the other systems.  */
  83 #define EMACS_SIGHOLDX(new_sig, old_sig) \
  84   do { (old_sig) = sigholdx (new_sig); } while (0)
  85 #define EMACS_SIGBLOCKX(new_sig, old_sig) \
  86   do { (old_sig) = sighold (new_sig); } while (0)
  87 #define EMACS_SIGUNBLOCKX(new_sig, old_sig) \
  88   do { (old_sig) = sigrelse (new_sig); } while (0)
  89 #define EMACS_SIGPAUSEX(sig) \
  90   EMACS_SIGPAUSE (new_sig);
  91
  92 #else /* ! defined (BSD4_1) */
  93
  94 #define EMACS_SIGFREE() \
  95   do { SIGMASKTYPE _dummy; EMACS_SIGSETMASK (SIGEMPTYMASK, _dummy); } while (0)
  96 #define EMACS_SIGHOLDX(new_sig, old_sig) \
  97   EMACS_SIGSETMASK (sigmask (new_sig), old_sig)
  98 #define EMACS_SIGBLOCKX(new_sig, old_sig) \
  99   EMACS_SIGBLOCK (sigmask (new_sig), old_sig)
 100 #define EMACS_SIGUNBLOCKX(new_sig, old_sig) \
 101   EMACS_SIGUNBLOCK (sigmask (new_sig), old_sig)
 102 #define EMACS_SIGPAUSEX(sig) \
 103   EMACS_SIGPAUSE (0)
 104
 105 #endif /* ! defined (BSD4_1) */
 106
 107 /* On bsd, [man says] kill does not accept a negative number to kill a pgrp.
 108    Must do that using the killpg call.  */
 109 #ifdef BSD
 110 #define EMACS_KILLPG(gid, signo) (killpg ( (gid), (signo)))
 111 #else
 112 #define EMACS_KILLPG(gid, signo) (kill   (-(gid), (signo)))
 113 #endif
 114
 115 /* Define SIGCHLD as an alias for SIGCLD.  There are many conditionals
 116    testing SIGCHLD.  */
 117
 118 #ifndef VMS
 119 #ifdef SIGCLD
 120 #ifndef SIGCHLD
 121 #define SIGCHLD SIGCLD
 122 #endif /* SIGCHLD */
 123 #endif /* ! defined (SIGCLD) */
 124 #endif /* VMS */