manual/examples/mkfsock.c

   1 #include <stddef.h>
   2 #include <stdio.h>
   3 #include <errno.h>
   4 #include <stdlib.h>
   5 #include <sys/socket.h>
   6 #include <sys/un.h>
   7
   8 int
   9 make_named_socket (const char *filename)
  10 {
  11   struct sockaddr_un name;
  12   int sock;
  13   size_t size;
  14
  15   /* Create the socket.  */
  16
  17   sock = socket (PF_UNIX, SOCK_DGRAM, 0);
  18   if (sock < 0)
  19     {
  20       perror ("socket");
  21       exit (EXIT_FAILURE);
  22     }
  23
  24   /* Bind a name to the socket.  */
  25
  26   name.sun_family = AF_FILE;
  27   strcpy (name.sun_path, filename);
  28
  29   /* The size of the address is
  30      the offset of the start of the filename,
  31      plus its length,
  32      plus one for the terminating null byte.  */
  33   size = (offsetof (struct sockaddr_un, sun_path)
  34           + strlen (name.sun_path) + 1);
  35
  36   if (bind (sock, (struct sockaddr *) &name, size) < 0)
  37     {
  38       perror ("bind");
  39       exit (EXIT_FAILURE);
  40     }
  41
  42   return sock;
  43 }