[PATCH BlueZ v7 09/11] test: Add signal handling for gatt-service

[Claudio Takahasi <claudio.takahasi@openbossa.org>]

This patch implements signal handling to run cleanup tasks before
exiting.
---
 test/gatt-service.c | 79 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 79 insertions(+)

diff --git a/test/gatt-service.c b/test/gatt-service.c
index 769fd37..4059336 100644
--- a/test/gatt-service.c
+++ b/test/gatt-service.c
@@ -27,6 +27,9 @@
 
 #include <errno.h>
 #include <stdio.h>
+#include <stdbool.h>
+#include <unistd.h>
+#include <sys/signalfd.h>
 
 #include <glib.h>
 #include <dbus/dbus.h>
@@ -97,9 +100,83 @@ static void create_services(DBusConnection *conn)
 	printf("Registered service: %s\n", service_path);
 }
 
+static gboolean signal_handler(GIOChannel *channel, GIOCondition cond,
+							gpointer user_data)
+{
+	static bool __terminated = false;
+	struct signalfd_siginfo si;
+	ssize_t result;
+	int fd;
+
+	if (cond & (G_IO_NVAL | G_IO_ERR | G_IO_HUP))
+		return FALSE;
+
+	fd = g_io_channel_unix_get_fd(channel);
+
+	result = read(fd, &si, sizeof(si));
+	if (result != sizeof(si))
+		return FALSE;
+
+	switch (si.ssi_signo) {
+	case SIGINT:
+	case SIGTERM:
+		if (!__terminated) {
+			printf("Terminating\n");
+			g_main_loop_quit(main_loop);
+		}
+
+		__terminated = true;
+		break;
+	}
+
+	return TRUE;
+}
+
+static guint setup_signalfd(void)
+{
+	GIOChannel *channel;
+	guint source;
+	sigset_t mask;
+	int fd;
+
+	sigemptyset(&mask);
+	sigaddset(&mask, SIGINT);
+	sigaddset(&mask, SIGTERM);
+
+	if (sigprocmask(SIG_BLOCK, &mask, NULL) < 0) {
+		perror("Failed to set signal mask");
+		return 0;
+	}
+
+	fd = signalfd(-1, &mask, 0);
+	if (fd < 0) {
+		perror("Failed to create signal descriptor");
+		return 0;
+	}
+
+	channel = g_io_channel_unix_new(fd);
+
+	g_io_channel_set_close_on_unref(channel, TRUE);
+	g_io_channel_set_encoding(channel, NULL, NULL);
+	g_io_channel_set_buffered(channel, FALSE);
+
+	source = g_io_add_watch(channel,
+				G_IO_IN | G_IO_HUP | G_IO_ERR | G_IO_NVAL,
+				signal_handler, NULL);
+
+	g_io_channel_unref(channel);
+
+	return source;
+}
+
 int main(int argc, char *argv[])
 {
 	DBusConnection *dbus_conn;
+	guint signal;
+
+	signal = setup_signalfd();
+	if (signal == 0)
+		return -errno;
 
 	dbus_conn = g_dbus_setup_bus(DBUS_BUS_SYSTEM, NULL, NULL);
 
@@ -114,6 +191,8 @@ int main(int argc, char *argv[])
 
 	g_main_loop_run(main_loop);
 
+	g_source_remove(signal);
+
 	g_slist_free_full(services, g_free);
 	dbus_connection_unref(dbus_conn);
 
-- 
1.8.3.1