1 /*
2 * Copyright (C) 2021 BlueKitchen GmbH
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 *
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. Neither the name of the copyright holders nor the names of
14 * contributors may be used to endorse or promote products derived
15 * from this software without specific prior written permission.
16 * 4. Any redistribution, use, or modification is done solely for
17 * personal benefit and not for any commercial purpose or for
18 * monetary gain.
19 *
20 * THIS SOFTWARE IS PROVIDED BY BLUEKITCHEN GMBH AND CONTRIBUTORS
21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
22 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
23 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL BLUEKITCHEN
24 * GMBH OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
25 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
26 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
27 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
28 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
29 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
30 * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 *
33 * Please inquire about commercial licensing options at
34 * [email protected]
35 *
36 */
37
38 #define BTSTACK_FILE__ "btstack_signal.c"
39
40 // enable System V signal API
41 #define _POSIX_C_SOURCE 200809
42
43 #include "btstack_signal.h"
44
45 #include <pthread.h>
46 #include <signal.h>
47 #include <string.h>
48
49 #include "btstack_run_loop.h"
50
signal_callback(void * arg)51 static void signal_callback(void * arg){
52 void (*callback)(void) = (void (*)(void)) arg;
53 (*callback)();
54 }
55
signal_thread(void * arg)56 static void * signal_thread(void *arg) {
57 // prepare registration
58 btstack_context_callback_registration_t registration;
59 memset(®istration, 0, sizeof(btstack_context_callback_registration_t));
60 registration.callback = &signal_callback;
61 registration.context = arg;
62
63 while (1){
64 // wait for signal
65 sigset_t sigset;
66 sigemptyset(&sigset);
67 sigaddset(&sigset, SIGINT);
68 int sig = 0;
69 (void) sigwait(&sigset, &sig);
70
71 // execute callback on main thread
72 btstack_run_loop_execute_on_main_thread(®istration);
73 }
74 return NULL;
75 }
76
btstack_signal_register_callback(int signal,void (* callback)(void))77 void btstack_signal_register_callback(int signal, void (*callback)(void)) {
78 // block signal
79 sigset_t base_mask;
80 sigemptyset (&base_mask);
81 sigaddset (&base_mask, signal);
82 sigprocmask (SIG_SETMASK, &base_mask, NULL);
83
84 // start thread to receive signal
85 pthread_t thread;
86 pthread_create(&thread, NULL, signal_thread, (void*) callback);
87 }
88