Add initial screensaver inhibiting code

daemon/dbus_messaging.c

@@ -187,3 +187,68 @@ void game_mode_context_loop(GameModeContext *context)
 		}
 	}
 }
+
+/**
+ * Attempts to inhibit the screensaver
+ * Uses the "org.freedesktop.ScreenSaver" interface
+ */
+static unsigned int screensaver_inhibit_cookie = 0;
+int game_mode_inhibit_screensaver(bool inhibit)
+{
+	const char *service = "org.freedesktop.ScreenSaver";
+	const char *object_path = "/org/freedesktop/ScreenSaver";
+	const char *interface = service;
+	const char *function = inhibit ? "Inhibit" : "UnInhibit";
+
+	sd_bus_message *msg = NULL;
+	sd_bus *bus = NULL;
+
+	int result = -1;
+
+	// Open the user bus
+	int ret = sd_bus_open_user(&bus);
+	if (ret < 0) {
+		LOG_ERROR("Could not connect to user bus: %s\n", strerror(-ret));
+	} else {
+		if (inhibit) {
+			ret = sd_bus_call_method(bus,
+			                         service,
+			                         object_path,
+			                         interface,
+			                         function,
+			                         NULL,
+			                         &msg,
+			                         "s",
+			                         "GameMode",
+			                         "s",
+			                         "GameMode Activated",
+			                         "u",
+			                         &screensaver_inhibit_cookie);
+
+		} else {
+			ret = sd_bus_call_method(bus,
+			                         service,
+			                         object_path,
+			                         interface,
+			                         function,
+			                         NULL,
+			                         &msg,
+			                         "u",
+			                         screensaver_inhibit_cookie);
+		}
+		if (ret < 0) {
+			LOG_ERROR("Could not call %s on %s: %s\n", function, service, strerror(-ret));
+		} else {
+			// Read the reply
+			ret = sd_bus_message_read(msg, "i", &result);
+			if (ret < 0) {
+				LOG_ERROR("Failure to parse response from %s on %s: %s\n",
+				          function,
+				          service,
+				          strerror(-ret));
+			}
+		}
+	}
+
+	return result;
+}

daemon/dbus_messaging.h

@@ -39,3 +39,8 @@ POSSIBILITY OF SUCH DAMAGE.
  * Run the main D-BUS loop "forever"
  */
 void game_mode_context_loop(GameModeContext *context);
+
+/**
+ * Inhibit the screensaver
+ */
+int game_mode_inhibit_screensaver(bool inhibit);

daemon/gamemode.c

@@ -33,6 +33,7 @@ POSSIBILITY OF SUCH DAMAGE.
 
 #include "gamemode.h"
 #include "daemon_config.h"
+#include "dbus_messaging.h"
 #include "governors-query.h"
 #include "governors.h"
 #include "helpers.h"
@@ -202,6 +203,9 @@ static void game_mode_context_enter(GameModeContext *self)
 			memset(self->initial_cpu_mode, 0, sizeof(self->initial_cpu_mode));
 		}
 	}
+
+	/* Inhibit the screensaver */
+	game_mode_inhibit_screensaver(true);
 }
 
 /**
@@ -215,6 +219,9 @@ static void game_mode_context_leave(GameModeContext *self)
 	LOG_MSG("Leaving Game Mode...\n");
 	sd_notifyf(0, "STATUS=%sGameMode is currently deactivated.%s\n", "\x1B[1;36m", "\x1B[0m");
 
+	/* UnInhibit the screensaver */
+	game_mode_inhibit_screensaver(false);
+
 	/* Reset the governer state back to initial */
 	if (self->initial_cpu_mode[0] != '\0') {
 		/* Choose the governor to reset to, using the config to override */