src/cgroups-agent/cgroups-agent.c

   1 /* SPDX-License-Identifier: LGPL-2.1-or-later */
   2
   3 #include <stdlib.h>
   4
   5 #include "fd-util.h"
   6 #include "log.h"
   7 #include "socket-util.h"
   8
   9 int main(int argc, char *argv[]) {
  10
  11         static const union sockaddr_union sa = {
  12                 .un.sun_family = AF_UNIX,
  13                 .un.sun_path = "/run/systemd/cgroups-agent",
  14         };
  15
  16         _cleanup_close_ int fd = -1;
  17         ssize_t n;
  18         size_t l;
  19         int r;
  20
  21         r = rearrange_stdio(-1, -1, -1);
  22         if (r < 0) {
  23                 log_error_errno(r, "Failed to connect stdin/stdout/stderr with /dev/null: %m");
  24                 return EXIT_FAILURE;
  25         }
  26
  27         if (argc != 2) {
  28                 log_error("Incorrect number of arguments.");
  29                 return EXIT_FAILURE;
  30         }
  31
  32         log_setup();
  33
  34         fd = socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC, 0);
  35         if (fd < 0) {
  36                 log_debug_errno(errno, "Failed to allocate socket: %m");
  37                 return EXIT_FAILURE;
  38         }
  39
  40         l = strlen(argv[1]);
  41
  42         n = sendto(fd, argv[1], l, 0, &sa.sa, SOCKADDR_UN_LEN(sa.un));
  43         if (n < 0) {
  44                 log_debug_errno(errno, "Failed to send cgroups agent message: %m");
  45                 return EXIT_FAILURE;
  46         }
  47
  48         if ((size_t) n != l) {
  49                 log_debug("Datagram size mismatch");
  50                 return EXIT_FAILURE;
  51         }
  52
  53         return EXIT_SUCCESS;
  54 }