src/cgroups-agent/cgroups-agent.c

   1 /***
   2   This file is part of systemd.
   3
   4   Copyright 2010 Lennart Poettering
   5
   6   systemd is free software; you can redistribute it and/or modify it
   7   under the terms of the GNU Lesser General Public License as published by
   8   the Free Software Foundation; either version 2.1 of the License, or
   9   (at your option) any later version.
  10
  11   systemd is distributed in the hope that it will be useful, but
  12   WITHOUT ANY WARRANTY; without even the implied warranty of
  13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  14   Lesser General Public License for more details.
  15
  16   You should have received a copy of the GNU Lesser General Public License
  17   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  18 ***/
  19
  20 #include <stdlib.h>
  21
  22 #include "sd-bus.h"
  23
  24 #include "bus-util.h"
  25 #include "log.h"
  26
  27 int main(int argc, char *argv[]) {
  28         _cleanup_(sd_bus_flush_close_unrefp) sd_bus *bus = NULL;
  29         int r;
  30
  31         if (argc != 2) {
  32                 log_error("Incorrect number of arguments.");
  33                 return EXIT_FAILURE;
  34         }
  35
  36         log_set_target(LOG_TARGET_AUTO);
  37         log_parse_environment();
  38         log_open();
  39
  40         /* We send this event to the private D-Bus socket and then the
  41          * system instance will forward this to the system bus. We do
  42          * this to avoid an activation loop when we start dbus when we
  43          * are called when the dbus service is shut down. */
  44
  45         r = bus_connect_system_systemd(&bus);
  46         if (r < 0) {
  47                 /* If we couldn't connect we assume this was triggered
  48                  * while systemd got restarted/transitioned from
  49                  * initrd to the system, so let's ignore this */
  50                 log_debug_errno(r, "Failed to get D-Bus connection: %m");
  51                 return EXIT_FAILURE;
  52         }
  53
  54         r = sd_bus_emit_signal(bus,
  55                                "/org/freedesktop/systemd1/agent",
  56                                "org.freedesktop.systemd1.Agent",
  57                                "Released",
  58                                "s", argv[1]);
  59         if (r < 0) {
  60                 log_debug_errno(r, "Failed to send signal message on private connection: %m");
  61                 return EXIT_FAILURE;
  62         }
  63
  64         return EXIT_SUCCESS;
  65 }