lib/sigevent.h

   1 /*
   2  * Quagga Signal handling header.
   3  *
   4  * Copyright (C) 2004 Paul Jakma.
   5  *
   6  * This file is part of Quagga.
   7  *
   8  * Quagga is free software; you can redistribute it and/or modify it
   9  * under the terms of the GNU General Public License as published by the
  10  * Free Software Foundation; either version 2, or (at your option) any
  11  * later version.
  12  *
  13  * Quagga is distributed in the hope that it will be useful, but
  14  * WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  * General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License along
  19  * with this program; see the file COPYING; if not, write to the Free Software
  20  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  21  */
  22
  23 #ifndef _FRR_SIGNAL_H
  24 #define _FRR_SIGNAL_H
  25
  26 #include <thread.h>
  27
  28 #ifdef __cplusplus
  29 extern "C" {
  30 #endif
  31
  32 #define FRR_SIGNAL_TIMER_INTERVAL 2L
  33
  34 struct frr_signal_t {
  35         int signal;         /* signal number    */
  36         void (*handler)(void); /* handler to call  */
  37
  38         volatile sig_atomic_t caught; /* private member   */
  39 };
  40
  41 /* initialise sigevent system
  42  * takes:
  43  * - pointer to valid struct thread_master
  44  * - number of elements in passed in signals array
  45  * - array of frr_signal_t's describing signals to handle
  46  *   and handlers to use for each signal
  47  */
  48 extern void signal_init(struct thread_master *m, int sigc,
  49                         struct frr_signal_t *signals);
  50
  51
  52 /*
  53  * Check whether any signals have been received and are pending. This is done
  54  * with the application's key signals blocked. The complete set of signals
  55  * is returned in 'setp', so the caller can restore them when appropriate.
  56  * If there are pending signals, returns 'true', 'false' otherwise.
  57  */
  58 bool frr_sigevent_check(sigset_t *setp);
  59
  60 /* check whether there are signals to handle, process any found */
  61 extern int frr_sigevent_process(void);
  62
  63 #ifdef __cplusplus
  64 }
  65 #endif
  66
  67 #endif /* _FRR_SIGNAL_H */