Ensure that only one browser-switchboard is active at any time

[browser-switch] / launcher.c

diff --git a/launcher.c b/launcher.c
index 33ac536..09428a9 100644 (file)
--- a/launcher.c
+++ b/launcher.c
@@ -193,10 +193,6 @@ void launch_microb(struct swb_context *ctx, char *uri) {
        /* Release the osso_browser D-Bus name so that MicroB can take it */
        dbus_release_osso_browser_name(ctx);
 
-       if ((pid = fork()) == -1) {
-               perror("fork");
-               exit(1);
-       }
 #ifdef FREMANTLE
        /* Put together the path to the MicroB browserd lockfile */
        if (!(homedir = getenv("HOME")))
@@ -232,45 +228,53 @@ void launch_microb(struct swb_context *ctx, char *uri) {
        }
        free(microb_profile_dir);
 
+       /* Set up the D-Bus eavesdropping we'll use to watch for MicroB
+          acquiring the com.nokia.osso_browser D-Bus name.  Again, this needs
+          to happen before the browser is launched, so that there's no race
+          between establishing the watch and browser startup.
+
+          Ideas for how to do this monitoring derived from the dbus-monitor
+          code (tools/dbus-monitor.c in the D-Bus codebase). */
+       dbus_error_init(&dbus_error);
+
+       raw_connection = dbus_bus_get_private(DBUS_BUS_SESSION, &dbus_error);
+       if (!raw_connection) {
+               fprintf(stderr,
+                       "Failed to open connection to session bus: %s\n",
+                       dbus_error.message);
+               dbus_error_free(&dbus_error);
+               exit(1);
+       }
+
+       dbus_bus_add_match(raw_connection,
+                          "type='signal',interface='org.freedesktop.DBus',member='NameOwnerChanged',arg0='com.nokia.osso_browser'",
+                          &dbus_error);
+       if (dbus_error_is_set(&dbus_error)) {
+               fprintf(stderr,
+                       "Failed to set up watch for browser UI start: %s\n",
+                       dbus_error.message);
+               dbus_error_free(&dbus_error);
+               exit(1);
+       }
+       filter_func = check_microb_started;
+       if (!dbus_connection_add_filter(raw_connection,
+                                       filter_func, NULL, NULL)) {
+               fprintf(stderr, "Failed to set up watch filter!\n");
+               exit(1);
+       }
+
+       if ((pid = fork()) == -1) {
+               perror("fork");
+               exit(1);
+       }
+
        if (pid > 0) {
                /* Parent process */
                /* Wait for our child to start the browser UI process and
                   for it to acquire the com.nokia.osso_browser D-Bus name,
                   then make the appropriate method call to open the browser
-                  window.
-
-                  Ideas for how to do this monitoring derived from the
-                  dbus-monitor code (tools/dbus-monitor.c in the D-Bus
-                  codebase). */
+                  window. */
                microb_started = 0;
-               dbus_error_init(&dbus_error);
-
-               raw_connection = dbus_bus_get_private(DBUS_BUS_SESSION,
-                                                     &dbus_error);
-               if (!raw_connection) {
-                       fprintf(stderr,
-                               "Failed to open connection to session bus: %s\n",
-                               dbus_error.message);
-                       dbus_error_free(&dbus_error);
-                       exit(1);
-               }
-
-               dbus_bus_add_match(raw_connection,
-                                  "type='signal',interface='org.freedesktop.DBus',member='NameOwnerChanged',arg0='com.nokia.osso_browser'",
-                                  &dbus_error);
-               if (dbus_error_is_set(&dbus_error)) {
-                       fprintf(stderr,
-                               "Failed to set up watch for browser UI start: %s\n",
-                               dbus_error.message);
-                       dbus_error_free(&dbus_error);
-                       exit(1);
-               }
-               filter_func = check_microb_started;
-               if (!dbus_connection_add_filter(raw_connection,
-                                               filter_func, NULL, NULL)) {
-                       fprintf(stderr, "Failed to set up watch filter!\n");
-                       exit(1);
-               }
                printf("Waiting for MicroB to start\n");
                while (!microb_started &&
                       dbus_connection_read_write_dispatch(raw_connection,
@@ -454,6 +458,8 @@ void launch_microb(struct swb_context *ctx, char *uri) {
                }
        } else {
                /* Child process */
+               dbus_connection_close(raw_connection);
+               dbus_connection_unref(raw_connection);
                close(fd);
                close_stdio();
 
@@ -466,6 +472,11 @@ void launch_microb(struct swb_context *ctx, char *uri) {
                execl("/usr/bin/maemo-invoker", "browser", (char *)NULL);
        }
 #else /* !FREMANTLE */
+       if ((pid = fork()) == -1) {
+               perror("fork");
+               exit(1);
+       }
+
        if (pid > 0) {
                /* Parent process */
                waitpid(pid, &status, 0);