tmpfiles: allow creation of named pipes with tmpfiles

[elogind.git] / src / cgroups-agent.c

diff --git a/src/cgroups-agent.c b/src/cgroups-agent.c
index 232b63e2da9df263b804fcd05c86b79c8cf04622..7f001e67d125fe5fc59a081e48751644d9b35102 100644 (file)
--- a/src/cgroups-agent.c
+++ b/src/cgroups-agent.c
@@ -1,4 +1,4 @@
-/*-*- Mode: C; c-basic-offset: 8 -*-*/
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
 
 /***
   This file is part of systemd.
@@ -21,13 +21,16 @@
 
 #include <dbus/dbus.h>
 
+#include <stdlib.h>
+
 #include "log.h"
+#include "dbus-common.h"
 
 int main(int argc, char *argv[]) {
         DBusError error;
         DBusConnection *bus = NULL;
         DBusMessage *m = NULL;
-        int r = 1;
+        int r = EXIT_FAILURE;
 
         dbus_error_init(&error);
 
@@ -36,8 +39,31 @@ int main(int argc, char *argv[]) {
                 goto finish;
         }
 
-        if (!(bus = dbus_bus_get(DBUS_BUS_SYSTEM, &error))) {
-                log_error("Failed to get D-Bus connection: %s", error.message);
+        log_set_target(LOG_TARGET_SYSLOG_OR_KMSG);
+        log_parse_environment();
+        log_open();
+
+        /* 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 activation loop when we start dbus when we
+         * are called when the dbus service is shut down. */
+
+        if (!(bus = dbus_connection_open_private("unix:path=/run/systemd/private", &error))) {
+#ifndef LEGACY
+                dbus_error_free(&error);
+
+                /* Retry with the pre v21 socket name, to ease upgrades */
+                if (!(bus = dbus_connection_open_private("unix:abstract=/org/freedesktop/systemd1/private", &error))) {
+#endif
+                        log_error("Failed to get D-Bus connection: %s", bus_error_message(&error));
+                        goto finish;
+                }
+#ifndef LEGACY
+        }
+#endif
+
+        if (bus_check_peercred(bus) < 0) {
+                log_error("Bus owner not root.");
                 goto finish;
         }
 
@@ -54,15 +80,18 @@ 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;
         }
 
-        r = 0;
+        r = EXIT_SUCCESS;
 
 finish:
-        if (bus)
+        if (bus) {
+                dbus_connection_flush(bus);
+                dbus_connection_close(bus);
                 dbus_connection_unref(bus);
+        }
 
         if (m)
                 dbus_message_unref(m);