posix: support for handling POSIX signals

platform/posix/btstack_signal.c

@@ -0,0 +1,82 @@
+/*
+ * Copyright (C) 2021 BlueKitchen GmbH
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the copyright holders nor the names of
+ *    contributors may be used to endorse or promote products derived
+ *    from this software without specific prior written permission.
+ * 4. Any redistribution, use, or modification is done solely for
+ *    personal benefit and not for any commercial purpose or for
+ *    monetary gain.
+ *
+ * THIS SOFTWARE IS PROVIDED BY BLUEKITCHEN GMBH AND CONTRIBUTORS
+ * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL MATTHIAS
+ * RINGWALD OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
+ * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * Please inquire about commercial licensing options at
+ * contact@bluekitchen-gmbh.com
+ *
+ */
+
+#define BTSTACK_FILE__ "btstack_signal.c"
+
+#include "btstack_signal.h"
+
+#include <pthread.h>
+#include <signal.h>
+#include <string.h>
+
+#include "btstack_run_loop.h"
+
+static void signal_callback(void * arg){
+    void (*callback)(void) = (void (*)(void)) arg;
+    (*callback)();
+}
+
+static void * signal_thread(void *arg) {
+    while (1){
+        // wait for signal
+        sigset_t sigset;
+        sigemptyset(&sigset);
+        sigaddset(&sigset, SIGINT);
+        int sig = 0;
+        (void) sigwait(&sigset, &sig);
+
+        // execute callback on main thread
+        btstack_context_callback_registration_t registration;
+        memset(&registration, 0, sizeof(btstack_context_callback_registration_t));
+        registration.callback = &signal_callback;
+        registration.context  = arg;
+        btstack_run_loop_execute_on_main_thread(&registration);
+    }
+    return NULL;
+}
+
+void btstack_signal_register_callback(int signal, void (*callback)(void)) {
+    // block signal
+    sigset_t base_mask;
+    sigemptyset (&base_mask);
+    sigaddset (&base_mask, signal);
+    sigprocmask (SIG_SETMASK, &base_mask, NULL);
+
+    // start thread to receive signal
+    pthread_t thread;
+    pthread_create(&thread, NULL, signal_thread, (void*) callback);
+}

platform/posix/btstack_signal.h

@@ -0,0 +1,62 @@
+/*
+ * Copyright (C) 2021 BlueKitchen GmbH
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the copyright holders nor the names of
+ *    contributors may be used to endorse or promote products derived
+ *    from this software without specific prior written permission.
+ * 4. Any redistribution, use, or modification is done solely for
+ *    personal benefit and not for any commercial purpose or for
+ *    monetary gain.
+ *
+ * THIS SOFTWARE IS PROVIDED BY BLUEKITCHEN GMBH AND CONTRIBUTORS
+ * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL MATTHIAS
+ * RINGWALD OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
+ * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * Please inquire about commercial licensing options at
+ * contact@bluekitchen-gmbh.com
+ *
+ */
+
+/*
+ *  Support for handling POSIX signals
+ */
+
+#ifndef BTSTACK_SIGNAL_H
+#define BTSTACK_SIGNAL_H
+
+#if defined __cplusplus
+extern "C" {
+#endif
+
+/* API_START */
+
+/**
+ * Register callback for signal
+ */
+void btstack_signal_register_callback(int signal, void (*callback)(void));
+
+/* API_END */
+
+#if defined __cplusplus
+}
+#endif
+
+#endif //BTSTACK_SIGNAL_H