tools: add ipc dbus example

1 files changed, 87 insertions, 0 deletions

diff --git a/schulung_tools/ipc_dbus/ping-client.c b/schulung_tools/ipc_dbus/ping-client.c
new file mode 100644
index 0000000..9ebf229
--- /dev/null
+++ b/schulung_tools/ipc_dbus/ping-client.c
@@ -0,0 +1,87 @@
+#include <glib.h>
+#include <dbus/dbus.h>
+#include <dbus/dbus-glib.h>
+#include <dbus/dbus-glib-lowlevel.h>
+#include <time.h>
+#include <stdlib.h>
+#include <malloc.h>
+#include <string.h>
+
+static const char *v_STRING;
+
+static int send_ping(void *bus_ptr)
+{
+	DBusConnection *bus = bus_ptr;
+	DBusMessage *message;
+	struct timespec tx_time;
+	struct timespec done_time;
+
+	message = dbus_message_new_signal("/de/linutronix/Ping",
+					  "de.linutronix.Ping", "Ping");
+	/* Append the string to the signal */
+	dbus_message_append_args(message,
+				 DBUS_TYPE_STRING, &v_STRING,
+				 DBUS_TYPE_INVALID);
+
+	clock_gettime(CLOCK_MONOTONIC, &tx_time);
+
+	/* Send the signal */
+	dbus_connection_send(bus, message, NULL);
+
+	clock_gettime(CLOCK_MONOTONIC, &done_time);
+
+	g_print("%ld.%06ld: ping sent: %d bytes (%ldus)\n",
+		tx_time.tv_sec, tx_time.tv_nsec / 1000, strlen(v_STRING) + 1,
+		((done_time.tv_sec - tx_time.tv_sec) * 1000000) +
+		(done_time.tv_nsec / 1000) - (tx_time.tv_nsec / 1000));
+
+	/* Free the signal now we have finished with it */
+	dbus_message_unref(message);
+
+	/* Return TRUE to tell the event loop we want to be called again */
+	return TRUE;
+}
+
+int main(int argc, char *argv[])
+{
+	GMainLoop *loop;
+	DBusConnection *bus;
+	DBusError error;
+
+	if (argc > 1) {
+		int val = atoi(argv[1]);
+		char *s;
+		if (val < 1)
+			val = 1;
+		s = malloc(val);
+		memset(s, '#', val);
+		s[val - 1] = 0;
+		v_STRING = s;
+	} else {
+		v_STRING = "default message";
+	}
+
+	/* Create a new event loop to run in */
+	loop = g_main_loop_new(NULL, FALSE);
+
+	/* Get a connection to the session bus */
+	dbus_error_init(&error);
+	bus = dbus_bus_get(DBUS_BUS_SESSION, &error);
+	if (!bus) {
+		g_warning("Failed to connect to the D-BUS daemon: %s",
+			  error.message);
+		dbus_error_free(&error);
+		return 1;
+	}
+
+	/* Set up this connection to work in a GLib event loop */
+	dbus_connection_setup_with_g_main(bus, NULL);
+
+	/* Every second call send_ping() with the bus as an argument */
+	g_timeout_add(1000, send_ping, bus);
+
+	/* Start the event loop */
+	g_main_loop_run(loop);
+
+	return 0;
+}