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 51 static void signal_callback(void * arg){ 52 void (*callback)(void) = (void (*)(void)) arg; 53 (*callback)(); 54 } 55 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 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