release/src/router/dnscrypt/src/libevent/evsignal-internal.h

   1 /*
   2  * Copyright 2000-2007 Niels Provos <provos@citi.umich.edu>
   3  * Copyright 2007-2012 Niels Provos and Nick Mathewson
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. The name of the author may not be used to endorse or promote products
  14  *    derived from this software without specific prior written permission.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  17  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  18  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  19  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  20  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  21  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  22  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  23  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  24  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  25  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  26  */
  27 #ifndef _EVSIGNAL_H_
  28 #define _EVSIGNAL_H_
  29
  30 #ifndef evutil_socket_t
  31 #include "event2/util.h"
  32 #endif
  33 #include <signal.h>
  34
  35 typedef void (*ev_sighandler_t)(int);
  36
  37 /* Data structure for the default signal-handling implementation in signal.c
  38  */
  39 struct evsig_info {
  40         /* Event watching ev_signal_pair[1] */
  41         struct event ev_signal;
  42         /* Socketpair used to send notifications from the signal handler */
  43         evutil_socket_t ev_signal_pair[2];
  44         /* True iff we've added the ev_signal event yet. */
  45         int ev_signal_added;
  46         /* Count of the number of signals we're currently watching. */
  47         int ev_n_signals_added;
  48
  49         /* Array of previous signal handler objects before Libevent started
  50          * messing with them.  Used to restore old signal handlers. */
  51 #ifdef _EVENT_HAVE_SIGACTION
  52         struct sigaction **sh_old;
  53 #else
  54         ev_sighandler_t **sh_old;
  55 #endif
  56         /* Size of sh_old. */
  57         int sh_old_max;
  58 };
  59 int evsig_init(struct event_base *);
  60 void evsig_dealloc(struct event_base *);
  61
  62 void evsig_set_base(struct event_base *base);
  63
  64 #endif /* _EVSIGNAL_H_ */