/* Datagram Socket Example

   Copyright (C) 1991-2018 Free Software Foundation, Inc.

   This program is free software; you can redistribute it and/or

   modify it under the terms of the GNU General Public License

   as published by the Free Software Foundation; either version 2

   of the License, or (at your option) any later version.

   This program is distributed in the hope that it will be useful,

   but WITHOUT ANY WARRANTY; without even the implied warranty of

   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License

   along with this program; if not, if not, see <http://www.gnu.org/licenses/>.

*/

#include <stdio.h>

#include <errno.h>

#include <stdlib.h>

#include <sys/socket.h>

#include <sys/un.h>

#define SERVER	"/tmp/serversocket"

#define MAXMSG	512

int

main (void)

{

  int sock;

  char message[MAXMSG];

  struct sockaddr_un name;

  size_t size;

  int nbytes;

  /* Remove the filename first, it's ok if the call fails */

  unlink (SERVER);

  /* Make the socket, then loop endlessly. */

  sock = make_named_socket (SERVER);

  while (1)

    {

      /* 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);

	}

      /* Give a diagnostic message. */

      fprintf (stderr, "Server: got message: %s\n", message);

      /* 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);

	}

    }

}