manual/examples/filesrv.c

   1 #include <stdio.h>
   2 #include <errno.h>
   3 #include <stdlib.h>
   4 #include <sys/socket.h>
   5 #include <sys/un.h>
   6
   7 #define SERVER  "/tmp/serversocket"
   8 #define MAXMSG  512
   9
  10 int
  11 main (void)
  12 {
  13   int sock;
  14   char message[MAXMSG];
  15   struct sockaddr_un name;
  16   size_t size;
  17   int nbytes;
  18
  19   /* Remove the filename first, it's ok if the call fails */
  20   unlink (SERVER);
  21
  22   /* Make the socket, then loop endlessly. */
  23   sock = make_named_socket (SERVER);
  24   while (1)
  25     {
  26       /* Wait for a datagram. */
  27       size = sizeof (name);
  28       nbytes = recvfrom (sock, message, MAXMSG, 0,
  29                          (struct sockaddr *) & name, &size);
  30       if (nbytes < 0)
  31         {
  32           perror ("recfrom (server)");
  33           exit (EXIT_FAILURE);
  34         }
  35
  36       /* Give a diagnostic message. */
  37       fprintf (stderr, "Server: got message: %s\n", message);
  38
  39       /* Bounce the message back to the sender. */
  40       nbytes = sendto (sock, message, nbytes, 0,
  41                        (struct sockaddr *) & name, size);
  42       if (nbytes < 0)
  43         {
  44           perror ("sendto (server)");
  45           exit (EXIT_FAILURE);
  46         }
  47     }
  48 }