
#include <stdio.h>
#include <errno.h>
#include <stdlib.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <unistd.h>

#define SERVER  "/tmp/serversocket"
#define MAXMSG  512

int
main (void)
@{
  int sock;
  char message[MAXMSG];
  struct sockaddr_un name;
  socklen_t size;
  int nbytes;

  /* @r{Remove the filename first, it's ok if the call fails} */
  unlink (SERVER);

  /* @r{Make the socket, then loop endlessly.} */
  sock = make_named_socket (SERVER);
  while (1)
    @{
      /* @r{Wait for a datagram.} */
      size = sizeof (name);
      nbytes = recvfrom (sock, message, MAXMSG, 0,
                         (struct sockaddr *) & name, &size);
      if (nbytes < 0)
        @{
          perror ("recfrom (server)");
          exit (EXIT_FAILURE);
        @}

      /* @r{Give a diagnostic message.} */
      fprintf (stderr, "Server: got message: %s\n", message);

      /* @r{Bounce the message back to the sender.} */
      nbytes = sendto (sock, message, nbytes, 0,
                       (struct sockaddr *) & name, size);
      if (nbytes < 0)
        @{
          perror ("sendto (server)");
          exit (EXIT_FAILURE);
        @}
    @}
@}
