src/syssignal.h

   1 /* syssignal.h - System-dependent definitions for signals.
   2
   3 Copyright (C) 1993, 1999, 2001-2012 Free Software Foundation, Inc.
   4
   5 This file is part of GNU Emacs.
   6
   7 GNU Emacs is free software: you can redistribute it and/or modify
   8 it under the terms of the GNU General Public License as published by
   9 the Free Software Foundation, either version 3 of the License, or
  10 (at your option) any later version.
  11
  12 GNU Emacs is distributed in the hope that it will be useful,
  13 but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 GNU General Public License for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
  19
  20 #include <signal.h>
  21
  22 extern void init_signals (void);
  23
  24 #ifdef HAVE_PTHREAD
  25 #include <pthread.h>
  26 /* If defined, asynchronous signals delivered to a non-main thread are
  27    forwarded to the main thread.  */
  28 #define FORWARD_SIGNAL_TO_MAIN_THREAD
  29 #endif
  30
  31 extern sigset_t empty_mask;
  32
  33 typedef void (*signal_handler_t) (int);
  34
  35 extern void emacs_sigaction_init (struct sigaction *, signal_handler_t);
  36
  37 #if ! (defined TIOCNOTTY || defined USG5 || defined CYGWIN)
  38 _Noreturn void croak (char *);
  39 #endif
  40
  41 #if defined (SIGIO) && defined (BROKEN_SIGIO)
  42 # undef SIGIO
  43 #endif
  44 /* These are only used by AIX  */
  45 #if defined (SIGPOLL) && defined (BROKEN_SIGPOLL)
  46 #undef SIGPOLL
  47 #endif
  48 #if defined (SIGAIO) && defined (BROKEN_SIGAIO)
  49 #undef SIGAIO
  50 #endif
  51 #if defined (SIGPTY) && defined (BROKEN_SIGPTY)
  52 #undef SIGPTY
  53 #endif
  54
  55 #if NSIG < NSIG_MINIMUM
  56 # undef NSIG
  57 # define NSIG NSIG_MINIMUM
  58 #endif
  59
  60 /* On bsd, [man says] kill does not accept a negative number to kill a pgrp.
  61    Must do that using the killpg call.  */
  62 #ifdef BSD_SYSTEM
  63 #define EMACS_KILLPG(gid, signo) (killpg ( (gid), (signo)))
  64 #else
  65 #ifdef WINDOWSNT
  66 #define EMACS_KILLPG(gid, signo) (kill (gid, signo))
  67 #else
  68 #define EMACS_KILLPG(gid, signo) (kill   (-(gid), (signo)))
  69 #endif
  70 #endif
  71
  72 /* Define SIGCHLD as an alias for SIGCLD.  There are many conditionals
  73    testing SIGCHLD.  */
  74 #ifdef SIGCLD
  75 #ifndef SIGCHLD
  76 #define SIGCHLD SIGCLD
  77 #endif /* SIGCHLD */
  78 #endif /* ! defined (SIGCLD) */
  79
  80 #ifndef HAVE_STRSIGNAL
  81 /* strsignal is in sysdep.c */
  82 char *strsignal (int);
  83 #endif
  84
  85 #ifdef FORWARD_SIGNAL_TO_MAIN_THREAD
  86 extern pthread_t main_thread;
  87 void handle_on_main_thread (int, signal_handler_t);
  88 #endif