From b0f2060628caa2fbbf7a31bddd418623808508a7 Mon Sep 17 00:00:00 2001
From: Bastien Nocera <hadess@hadess.net>
Date: Mon, 3 Nov 2008 15:00:31 +0000
Subject: [PATCH] Exit when no devices are in use

When no actions are happening on any of the devices, make the
daemon exit after 30 seconds.
---
 src/fprintd.h |  2 ++
 src/main.c    |  2 ++
 src/manager.c | 41 +++++++++++++++++++++++++++++++++++++++++
 3 files changed, 45 insertions(+)

diff --git a/src/fprintd.h b/src/fprintd.h
index 7bb3db6..bed50b6 100644
--- a/src/fprintd.h
+++ b/src/fprintd.h
@@ -24,8 +24,10 @@
 #include <dbus/dbus-glib.h>
 
 /* General */
+#define TIMEOUT 30
 #define FPRINT_SERVICE_NAME "net.reactivated.Fprint"
 extern DBusGConnection *fprintd_dbus_conn;
+extern gboolean no_timeout;
 GQuark fprint_error_quark(void);
 
 /* Errors */
diff --git a/src/main.c b/src/main.c
index 2a6bd61..e7c29be 100644
--- a/src/main.c
+++ b/src/main.c
@@ -34,6 +34,7 @@
 #include "file_storage.h"
 
 DBusGConnection *fprintd_dbus_conn = NULL;
+gboolean no_timeout = FALSE;
 static gboolean g_fatal_warnings = FALSE;
 
 GQuark fprint_error_quark(void)
@@ -287,6 +288,7 @@ bail:
 
 static const GOptionEntry entries[] = {
 	{"g-fatal-warnings", 0, 0, G_OPTION_ARG_NONE, &g_fatal_warnings, "Make all warnings fatal", NULL},
+	{"no-timeout", 't', 0, G_OPTION_ARG_NONE, &no_timeout, "Do not exit after unused for a while", NULL},
 	{ NULL }
 };
 
diff --git a/src/manager.c b/src/manager.c
index f39729e..158c362 100644
--- a/src/manager.c
+++ b/src/manager.c
@@ -17,6 +17,8 @@
  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  */
 
+#include <unistd.h>
+#include <stdlib.h>
 #include <dbus/dbus-glib-bindings.h>
 #include <glib.h>
 #include <glib/gi18n.h>
@@ -38,6 +40,8 @@ typedef struct
 {
 	GError *last_error;
 	GSList *dev_registry;
+	guint timeout_id;
+	volatile int num_device_used;
 } FprintManagerPrivate;
 
 #define FPRINT_MANAGER_GET_PRIVATE(o)  \
@@ -71,6 +75,35 @@ static gchar *get_device_path(FprintDevice *rdev)
 		_fprint_device_get_id(rdev));
 }
 
+static gboolean
+fprint_manager_timeout_cb (FprintManager *manager)
+{
+	g_message ("No devices in use, exit");
+	//FIXME kill all the devices
+	exit(0);
+}
+
+static void
+fprint_manager_action_notified (FprintDevice *rdev, GParamSpec *spec, FprintManager *manager)
+{
+	FprintManagerPrivate *priv = FPRINT_MANAGER_GET_PRIVATE (manager);
+	int action;
+
+	g_object_get (G_OBJECT(rdev), "action", &action, NULL);
+	if (priv->timeout_id > 0) {
+		g_source_remove (priv->timeout_id);
+		priv->timeout_id = 0;
+	}
+	if (action == 0) {
+		if (g_atomic_int_dec_and_test (&priv->num_device_used)) {
+			if (!no_timeout)
+				priv->timeout_id = g_timeout_add_seconds (TIMEOUT, (GSourceFunc) fprint_manager_timeout_cb, manager);
+		}
+	} else {
+		g_atomic_int_add (&priv->num_device_used, 1);
+	}
+}
+
 static void
 fprint_manager_init (FprintManager *manager)
 {
@@ -79,6 +112,8 @@ fprint_manager_init (FprintManager *manager)
 	struct fp_dscv_dev *ddev;
 	int i = 0;
 
+	priv->num_device_used = 0;
+
 	if (!discovered_devs) {
 		priv->last_error = g_error_new (FPRINT_ERROR, FPRINT_ERROR_INTERNAL,
 						_("An internal error occurred in libfprint"));
@@ -92,12 +127,18 @@ fprint_manager_init (FprintManager *manager)
 		FprintDevice *rdev = fprint_device_new(ddev);
 		gchar *path;
 
+		g_signal_connect (G_OBJECT(rdev), "notify::action",
+				  G_CALLBACK (fprint_manager_action_notified), manager);
+
 		priv->dev_registry = g_slist_prepend(priv->dev_registry, rdev);
 		path = get_device_path(rdev);
 		dbus_g_connection_register_g_object(fprintd_dbus_conn, path,
 			G_OBJECT(rdev));
 		g_free(path);
 	}
+
+	if (!no_timeout)
+		priv->timeout_id = g_timeout_add_seconds (TIMEOUT, (GSourceFunc) fprint_manager_timeout_cb, manager);
 }
 
 FprintManager *fprint_manager_new(void)