src/cgroups-agent/cgroups-agent.c

   1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
   2
   3 /***
   4   This file is part of systemd.
   5
   6   Copyright 2010 Lennart Poettering
   7
   8   systemd is free software; you can redistribute it and/or modify it
   9   under the terms of the GNU Lesser General Public License as published by
  10   the Free Software Foundation; either version 2.1 of the License, or
  11   (at your option) any later version.
  12
  13   systemd is distributed in the hope that it will be useful, but
  14   WITHOUT ANY WARRANTY; without even the implied warranty of
  15   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  16   Lesser General Public License for more details.
  17
  18   You should have received a copy of the GNU Lesser General Public License
  19   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  20 ***/
  21
  22 #include <stdlib.h>
  23
  24 #include "sd-bus.h"
  25
  26 #include "bus-util.h"
  27 #include "log.h"
  28
  29 int main(int argc, char *argv[]) {
  30         _cleanup_bus_flush_close_unref_ sd_bus *bus = NULL;
  31         int r;
  32
  33         if (argc != 2) {
  34                 log_error("Incorrect number of arguments.");
  35                 return EXIT_FAILURE;
  36         }
  37
  38         log_set_target(LOG_TARGET_AUTO);
  39         log_parse_environment();
  40         log_open();
  41
  42         /* We send this event to the private D-Bus socket and then the
  43          * system instance will forward this to the system bus. We do
  44          * this to avoid an activation loop when we start dbus when we
  45          * are called when the dbus service is shut down. */
  46
  47         r = bus_connect_system_systemd(&bus);
  48         if (r < 0) {
  49                 /* If we couldn't connect we assume this was triggered
  50                  * while systemd got restarted/transitioned from
  51                  * initrd to the system, so let's ignore this */
  52                 log_debug_errno(r, "Failed to get D-Bus connection: %m");
  53                 return EXIT_FAILURE;
  54         }
  55
  56         r = sd_bus_emit_signal(bus,
  57                                "/org/freedesktop/systemd1/agent",
  58                                "org.freedesktop.systemd1.Agent",
  59                                "Released",
  60                                "s", argv[1]);
  61         if (r < 0) {
  62                 log_debug_errno(r, "Failed to send signal message on private connection: %m");
  63                 return EXIT_FAILURE;
  64         }
  65
  66         return EXIT_SUCCESS;
  67 }