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 /* Interrupt input is not used if there is no FIONREAD.  */
  42 #include <sys/ioctl.h>
  43 #if defined BROKEN_SIGIO || ! defined FIONREAD || defined BROKEN_FIONREAD
  44 # undef SIGIO
  45 #endif
  46
  47 /* These are only used by AIX  */
  48 #if defined (SIGPOLL) && defined (BROKEN_SIGPOLL)
  49 #undef SIGPOLL
  50 #endif
  51 #if defined (SIGAIO) && defined (BROKEN_SIGAIO)
  52 #undef SIGAIO
  53 #endif
  54 #if defined (SIGPTY) && defined (BROKEN_SIGPTY)
  55 #undef SIGPTY
  56 #endif
  57
  58 #if NSIG < NSIG_MINIMUM
  59 # undef NSIG
  60 # define NSIG NSIG_MINIMUM
  61 #endif
  62
  63 /* On bsd, [man says] kill does not accept a negative number to kill a pgrp.
  64    Must do that using the killpg call.  */
  65 #ifdef BSD_SYSTEM
  66 #define EMACS_KILLPG(gid, signo) (killpg ( (gid), (signo)))
  67 #else
  68 #ifdef WINDOWSNT
  69 #define EMACS_KILLPG(gid, signo) (kill (gid, signo))
  70 #else
  71 #define EMACS_KILLPG(gid, signo) (kill   (-(gid), (signo)))
  72 #endif
  73 #endif
  74
  75 /* Define SIGCHLD as an alias for SIGCLD.  There are many conditionals
  76    testing SIGCHLD.  */
  77 #ifdef SIGCLD
  78 #ifndef SIGCHLD
  79 #define SIGCHLD SIGCLD
  80 #endif /* SIGCHLD */
  81 #endif /* ! defined (SIGCLD) */
  82
  83 #ifndef HAVE_STRSIGNAL
  84 /* strsignal is in sysdep.c */
  85 char *strsignal (int);
  86 #endif
  87
  88 #ifdef FORWARD_SIGNAL_TO_MAIN_THREAD
  89 extern pthread_t main_thread;
  90 #endif
  91
  92 void handle_on_main_thread (int, signal_handler_t);