src/cgroups-agent/cgroups-agent.c

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2
   3 #include <stdlib.h>
   4 #include <sys/socket.h>
   5
   6 #include "fd-util.h"
   7 #include "log.h"
   8 #include "socket-util.h"
   9
  10 int main(int argc, char *argv[]) {
  11
  12         static const union sockaddr_union sa = {
  13                 .un.sun_family = AF_UNIX,
  14                 .un.sun_path = "/run/systemd/cgroups-agent",
  15         };
  16
  17         _cleanup_close_ int fd = -1;
  18         ssize_t n;
  19         size_t l;
  20
  21         if (argc != 2) {
  22                 log_error("Incorrect number of arguments.");
  23                 return EXIT_FAILURE;
  24         }
  25
  26         log_set_target(LOG_TARGET_AUTO);
  27         log_parse_environment();
  28         log_open();
  29
  30         fd = socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC, 0);
  31         if (fd < 0) {
  32                 log_debug_errno(errno, "Failed to allocate socket: %m");
  33                 return EXIT_FAILURE;
  34         }
  35
  36         l = strlen(argv[1]);
  37
  38         n = sendto(fd, argv[1], l, 0, &sa.sa, SOCKADDR_UN_LEN(sa.un));
  39         if (n < 0) {
  40                 log_debug_errno(errno, "Failed to send cgroups agent message: %m");
  41                 return EXIT_FAILURE;
  42         }
  43
  44         if ((size_t) n != l) {
  45                 log_debug("Datagram size mismatch");
  46                 return EXIT_FAILURE;
  47         }
  48
  49         return EXIT_SUCCESS;
  50 }