src/syssignal.h

   1 /* syssignal.h - System-dependent definitions for signals.
   2
   3 Copyright (C) 1993, 1999, 2001-2017 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 (at
  10 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 <https://www.gnu.org/licenses/>.  */
  19
  20 #ifndef EMACS_SYSSIGNAL_H
  21 #define EMACS_SYSSIGNAL_H
  22
  23 #include <signal.h>
  24
  25 extern void init_signals (bool);
  26 extern void block_child_signal (sigset_t *);
  27 extern void unblock_child_signal (sigset_t const *);
  28 extern void block_interrupt_signal (sigset_t *);
  29 extern void restore_signal_mask (sigset_t const *);
  30 extern void block_tty_out_signal (sigset_t *);
  31 extern void unblock_tty_out_signal (sigset_t const *);
  32
  33 #ifdef HAVE_PTHREAD
  34 #include <pthread.h>
  35 extern pthread_t main_thread_id;
  36 /* If defined, asynchronous signals delivered to a non-main thread are
  37    forwarded to the main thread.  */
  38 #define FORWARD_SIGNAL_TO_MAIN_THREAD
  39 #endif
  40
  41 /* On Cygwin as of 2015-06-22 SIGEV_SIGNAL is defined as an enum
  42    constant but not as a macro. */
  43 #if defined CYGWIN && !defined SIGEV_SIGNAL
  44 #define SIGEV_SIGNAL SIGEV_SIGNAL
  45 #endif
  46
  47 #if defined HAVE_TIMER_SETTIME && defined SIGEV_SIGNAL
  48 # define HAVE_ITIMERSPEC
  49 #endif
  50
  51 #if (defined SIGPROF && !defined PROFILING \
  52      && (defined HAVE_SETITIMER || defined HAVE_ITIMERSPEC))
  53 # define PROFILER_CPU_SUPPORT
  54 #endif
  55
  56 extern sigset_t empty_mask;
  57
  58 typedef void (*signal_handler_t) (int);
  59
  60 extern void emacs_sigaction_init (struct sigaction *, signal_handler_t);
  61 char const *safe_strsignal (int) ATTRIBUTE_CONST;
  62
  63 #if NSIG < NSIG_MINIMUM
  64 # undef NSIG
  65 # define NSIG NSIG_MINIMUM
  66 #endif
  67
  68 #ifndef SA_SIGINFO
  69 # define SA_SIGINFO 0
  70 #endif
  71
  72 #ifndef emacs_raise
  73 # define emacs_raise(sig) raise (sig)
  74 #endif
  75
  76 #ifndef HAVE_STRSIGNAL
  77 # define strsignal(sig) safe_strsignal (sig)
  78 #endif
  79
  80 void deliver_process_signal (int, signal_handler_t);
  81
  82 #endif /* EMACS_SYSSIGNAL_H */