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_ */