summaryrefslogtreecommitdiffstats
path: root/openbsc/src/signal.c
blob: bf5671ee19fc5e8aa5c07ed394f24ed2ff95973d (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
/* Generic signalling/notification infrastructure */
/* (C) 2009 by Holger Hans Peter Freyther <zecke@selfish.org>
 * All Rights Reserved
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 */

#include <openbsc/signal.h>
#include <openbsc/talloc.h>
#include <stdlib.h>
#include <string.h>


static void *tall_sigh_ctx;
static LLIST_HEAD(signal_handler_list);

struct signal_handler {
	struct llist_head entry;
	unsigned int subsys;
	signal_cbfn *cbfn;
	void *data;
};


int register_signal_handler(unsigned int subsys, signal_cbfn *cbfn, void *data)
{
	struct signal_handler *sig_data;

	sig_data = talloc(tall_sigh_ctx, struct signal_handler);
	if (!sig_data)
		return -ENOMEM;

	memset(sig_data, 0, sizeof(*sig_data));

	sig_data->subsys = subsys;
	sig_data->data = data;
	sig_data->cbfn = cbfn;

	/* FIXME: check if we already have a handler for this subsys/cbfn/data */

	llist_add_tail(&sig_data->entry, &signal_handler_list);

	return 0;
}

void unregister_signal_handler(unsigned int subsys, signal_cbfn *cbfn, void *data)
{
	struct signal_handler *handler;

	llist_for_each_entry(handler, &signal_handler_list, entry) {
		if (handler->cbfn == cbfn && handler->data == data 
		    && subsys == handler->subsys) {
			llist_del(&handler->entry);
			talloc_free(handler);
			break;
		}
	}
}


void dispatch_signal(unsigned int subsys, unsigned int signal, void *signal_data)
{
	struct signal_handler *handler;

	llist_for_each_entry(handler, &signal_handler_list, entry) {
		if (handler->subsys != subsys)
			continue;
		(*handler->cbfn)(subsys, signal, handler->data, signal_data);
	}
}

static __attribute__((constructor)) void on_dso_load_signal(void)
{
	tall_sigh_ctx = talloc_named_const(NULL, 1, "signal_handler");
}