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 #include <sys/socket.h>
  22
  23 #include "fd-util.h"
  24 #include "log.h"
  25 #include "socket-util.h"
  26
  27 int main(int argc, char *argv[]) {
  28
  29         static const union sockaddr_union sa = {
  30                 .un.sun_family = AF_UNIX,
  31                 .un.sun_path = "/run/systemd/cgroups-agent",
  32         };
  33
  34         _cleanup_close_ int fd = -1;
  35         ssize_t n;
  36         size_t l;
  37
  38         if (argc != 2) {
  39                 log_error("Incorrect number of arguments.");
  40                 return EXIT_FAILURE;
  41         }
  42
  43         log_set_target(LOG_TARGET_AUTO);
  44         log_parse_environment();
  45         log_open();
  46
  47         fd = socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC, 0);
  48         if (fd < 0) {
  49                 log_debug_errno(errno, "Failed to allocate socket: %m");
  50                 return EXIT_FAILURE;
  51         }
  52
  53         l = strlen(argv[1]);
  54
  55         n = sendto(fd, argv[1], l, 0, &sa.sa, SOCKADDR_UN_LEN(sa.un));
  56         if (n < 0) {
  57                 log_debug_errno(errno, "Failed to send cgroups agent message: %m");
  58                 return EXIT_FAILURE;
  59         }
  60
  61         if ((size_t) n != l) {
  62                 log_debug("Datagram size mismatch");
  63                 return EXIT_FAILURE;
  64         }
  65
  66         return EXIT_SUCCESS;
  67 }