src/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 General Public License as published by
  10   the Free Software Foundation; either version 2 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   General Public License for more details.
  17
  18   You should have received a copy of the GNU General Public License
  19   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  20 ***/
  21
  22 #include <dbus/dbus.h>
  23
  24 #include <stdlib.h>
  25
  26 #include "log.h"
  27 #include "dbus-common.h"
  28
  29 int main(int argc, char *argv[]) {
  30         DBusError error;
  31         DBusConnection *bus = NULL;
  32         DBusMessage *m = NULL;
  33         int r = EXIT_FAILURE;
  34
  35         dbus_error_init(&error);
  36
  37         if (argc != 2) {
  38                 log_error("Incorrect number of arguments.");
  39                 goto finish;
  40         }
  41
  42         log_set_target(LOG_TARGET_SYSLOG_OR_KMSG);
  43         log_parse_environment();
  44         log_open();
  45
  46         /* We send this event to the private D-Bus socket and then the
  47          * system instance will forward this to the system bus. We do
  48          * this to avoid an activation loop when we start dbus when we
  49          * are called when the dbus service is shut down. */
  50
  51         if (!(bus = dbus_connection_open_private("unix:path=/run/systemd/private", &error))) {
  52 #ifndef LEGACY
  53                 dbus_error_free(&error);
  54
  55                 /* Retry with the pre v21 socket name, to ease upgrades */
  56                 if (!(bus = dbus_connection_open_private("unix:abstract=/org/freedesktop/systemd1/private", &error))) {
  57 #endif
  58                         log_error("Failed to get D-Bus connection: %s", bus_error_message(&error));
  59                         goto finish;
  60                 }
  61 #ifndef LEGACY
  62         }
  63 #endif
  64
  65         if (bus_check_peercred(bus) < 0) {
  66                 log_error("Bus owner not root.");
  67                 goto finish;
  68         }
  69
  70         if (!(m = dbus_message_new_signal("/org/freedesktop/systemd1/agent", "org.freedesktop.systemd1.Agent", "Released"))) {
  71                 log_error("Could not allocate signal message.");
  72                 goto finish;
  73         }
  74
  75         if (!dbus_message_append_args(m,
  76                                       DBUS_TYPE_STRING, &argv[1],
  77                                       DBUS_TYPE_INVALID)) {
  78                 log_error("Could not attach group information to signal message.");
  79                 goto finish;
  80         }
  81
  82         if (!dbus_connection_send(bus, m, NULL)) {
  83                 log_error("Failed to send signal message on private connection.");
  84                 goto finish;
  85         }
  86
  87         r = EXIT_SUCCESS;
  88
  89 finish:
  90         if (bus) {
  91                 dbus_connection_flush(bus);
  92                 dbus_connection_close(bus);
  93                 dbus_connection_unref(bus);
  94         }
  95
  96         if (m)
  97                 dbus_message_unref(m);
  98
  99         dbus_error_free(&error);
 100         return r;
 101 }