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_INTERNAL_H_INCLUDED_
28 #define EVSIGNAL_INTERNAL_H_INCLUDED_
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 void evsig_free_globals_(void);
64 
65 #endif /* EVSIGNAL_INTERNAL_H_INCLUDED_ */
66