Лекции по курсу "Системное программирование для UNIX". Литвинов Д.Г. - 57 стр.

    char buffer[MAXMSG];
    int nbytes;

    nbytes = read (filedes, buffer, MAXMSG);
    if (nbytes < 0)
    {
        /* Read error. */
        perror ("read");
        exit (EXIT_FAILURE);
    }
    else if (nbytes == 0)
    /* End-of-file. */
    return -1;
    else
    {
        /* Data read. */
        fprintf (stderr, "Server: got message: `%s'\n", buffer);
        return 0;
    }
}

int main (void)
{
    extern int make_socket (uint16_t port);
    int sock;
    fd_set active_fd_set, read_fd_set;
    int i;
    struct sockaddr_in clientname;
    size_t size;

    /* Create the socket and set it up to accept connections. */
    sock = make_socket (PORT);
    if (listen (sock, 1) < 0)
    {
        perror ("listen");
        exit (EXIT_FAILURE);
    }

    /* Initialize the set of active sockets. */
    FD_ZERO (&active_fd_set);
    FD_SET (sock, &active_fd_set);

    while (1)
    {
        read_fd_set = active_fd_set;
        if (select (FD_SETSIZE, &read_fd_set, NULL, NULL, NULL) < 0)
        {
            perror ("select");
            exit (EXIT_FAILURE);
        }

       for (i = 0; i < FD_SETSIZE; ++i)
       if (FD_ISSET (i, &read_fd_set))
       {
           if (i == sock)
           {
               int new;
               size = sizeof (clientname);
               new = accept (sock,
                             (struct sockaddr *) &clientname,
                             &size);
               if (new < 0)
               {
                   perror ("accept");



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