name.sun_path[sizeof (name.sun_path) - 1] = '\0';
make_named_socket (const char *filename){  struct sockaddr_un name;  int sock;  size_t size;  /* Create the socket.  */  sock = socket (PF_LOCAL, SOCK_DGRAM, 0);  if (sock < 0)    {      perror ("socket");      exit (EXIT_FAILURE);    }  /* Bind a name to the socket.  */  name.sun_family = AF_LOCAL;  strncpy (name.sun_path, filename, sizeof (name.sun_path));  /* The size of the address is     the offset of the start of the filename,     plus its length,     plus one for the terminating null byte.     Alternatively you can just do:     size = SUN_LEN (&name);  */  size = (offsetof (struct sockaddr_un, sun_path)	  + strlen (name.sun_path) + 1);  if (bind (sock, (struct sockaddr *) &name, size) < 0)    {      perror ("bind");      exit (EXIT_FAILURE);    }  return sock;}