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authorLennart Poettering <lennart@poettering.net>2010-09-03 01:45:14 +0200
committerLennart Poettering <lennart@poettering.net>2010-09-03 01:45:53 +0200
commit53c6a358a8bb9e722ac6b8ba750acf576a61bf27 (patch)
tree8d99b97c82db9a5857eab87b8fb1634d67022eb0 /src
parentb401e1fb9df7ea8b0fd26e16d886056a5ae7c5d9 (diff)
dbus: don't send cgroup agent messages directly to system bus to avoid dbus activation loop
Diffstat (limited to 'src')
-rw-r--r--src/cgroups-agent.c33
-rw-r--r--src/dbus.c38
2 files changed, 41 insertions, 30 deletions
diff --git a/src/cgroups-agent.c b/src/cgroups-agent.c
index 30aeede943..3fd0de698f 100644
--- a/src/cgroups-agent.c
+++ b/src/cgroups-agent.c
@@ -43,22 +43,20 @@ int main(int argc, char *argv[]) {
log_parse_environment();
log_open();
- /* If possible we go via the system bus, to make sure that
- * session instances get the messages. If not possible we talk
- * to the system instance directly. */
- if (!(bus = dbus_bus_get_private(DBUS_BUS_SYSTEM, &error))) {
-
- dbus_error_free(&error);
-
- if (!(bus = dbus_connection_open_private("unix:abstract=/org/freedesktop/systemd1/private", &error))) {
- log_error("Failed to get D-Bus connection: %s", bus_error_message(&error));
- goto finish;
- }
-
- if (bus_check_peercred(bus) < 0) {
- log_error("Bus owner not root.");
- goto finish;
- }
+
+ /* We send this event to the private D-Bus socket and then the
+ * system instance will forward this to the system bus. We do
+ * this to avoid an actviation loop when we start dbus when we
+ * are called when the dbus service is shut down. */
+
+ if (!(bus = dbus_connection_open_private("unix:abstract=/org/freedesktop/systemd1/private", &error))) {
+ log_error("Failed to get D-Bus connection: %s", bus_error_message(&error));
+ goto finish;
+ }
+
+ if (bus_check_peercred(bus) < 0) {
+ log_error("Bus owner not root.");
+ goto finish;
}
if (!(m = dbus_message_new_signal("/org/freedesktop/systemd1/agent", "org.freedesktop.systemd1.Agent", "Released"))) {
@@ -74,7 +72,7 @@ int main(int argc, char *argv[]) {
}
if (!dbus_connection_send(bus, m, NULL)) {
- log_error("Failed to send signal message.");
+ log_error("Failed to send signal message on private connection.");
goto finish;
}
@@ -87,6 +85,7 @@ finish:
dbus_connection_unref(bus);
}
+
if (m)
dbus_message_unref(m);
diff --git a/src/dbus.c b/src/dbus.c
index 8c969eab63..85284324b3 100644
--- a/src/dbus.c
+++ b/src/dbus.c
@@ -464,7 +464,9 @@ static DBusHandlerResult system_bus_message_filter(DBusConnection *connection, D
log_debug("System D-Bus connection terminated.");
bus_done_system(m);
- } else if (dbus_message_is_signal(message, "org.freedesktop.systemd1.Agent", "Released")) {
+ } else if (m->running_as != MANAGER_SYSTEM &&
+ dbus_message_is_signal(message, "org.freedesktop.systemd1.Agent", "Released")) {
+
const char *cgroup;
if (!dbus_message_get_args(message, &error,
@@ -498,7 +500,9 @@ static DBusHandlerResult private_bus_message_filter(DBusConnection *connection,
if (dbus_message_is_signal(message, DBUS_INTERFACE_LOCAL, "Disconnected"))
shutdown_connection(m, connection);
- else if (dbus_message_is_signal(message, "org.freedesktop.systemd1.Agent", "Released")) {
+ else if (m->running_as == MANAGER_SYSTEM &&
+ dbus_message_is_signal(message, "org.freedesktop.systemd1.Agent", "Released")) {
+
const char *cgroup;
if (!dbus_message_get_args(message, &error,
@@ -507,6 +511,12 @@ static DBusHandlerResult private_bus_message_filter(DBusConnection *connection,
log_error("Failed to parse Released message: %s", error.message);
else
cgroup_notify_empty(m, cgroup);
+
+ /* Forward the message to the system bus, so that user
+ * instances are notified as well */
+
+ if (m->system_bus)
+ dbus_connection_send(m->system_bus, message, NULL);
}
dbus_error_free(&error);
@@ -808,17 +818,19 @@ static int bus_init_system(Manager *m) {
goto fail;
}
- dbus_bus_add_match(m->system_bus,
- "type='signal',"
- "interface='org.freedesktop.systemd1.Agent',"
- "member='Released',"
- "path='/org/freedesktop/systemd1/agent'",
- &error);
-
- if (dbus_error_is_set(&error)) {
- log_error("Failed to register match: %s", error.message);
- r = -EIO;
- goto fail;
+ if (m->running_as != MANAGER_SYSTEM) {
+ dbus_bus_add_match(m->system_bus,
+ "type='signal',"
+ "interface='org.freedesktop.systemd1.Agent',"
+ "member='Released',"
+ "path='/org/freedesktop/systemd1/agent'",
+ &error);
+
+ if (dbus_error_is_set(&error)) {
+ log_error("Failed to register match: %s", error.message);
+ r = -EIO;
+ goto fail;
+ }
}
if (m->api_bus != m->system_bus) {