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Sourcecode: netkit-ntalk version File versions  Download package

io.c

/*
 * Copyright (c) 1983 Regents of the University of California.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *    This product includes software developed by the University of
 *    California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

/*
 * From: @(#)io.c 5.6 (Berkeley) 3/1/91
 */
char io_rcsid[] = 
  "$Id: io.c,v 1.13 2000/07/23 00:31:57 dholland Exp $";

/*
 * This file contains the I/O handling and the exchange of 
 * edit characters. This connection itself is established in
 * ctl.c
 */

#include <sys/time.h>
#include <sys/ioctl.h>
#include <stdio.h>
#include <errno.h>
#include <string.h>
#include <unistd.h>
#include "talk.h"

/*
 * The routine to do the actual talking
 */
void
talk(void)
{
      fd_set read_set;
      int nb, k;
      unsigned char buf[BUFSIZ];

      message("Connection established");
      dobeep();
      dorefresh();

      current_line = 0;

      /*
       * Wait on both the other process and standard input
       */
      for (;;) {
            FD_ZERO(&read_set);
            FD_SET(0, &read_set);
            if (sockt>=0) FD_SET(sockt, &read_set);
            nb = select(sockt+2, &read_set, NULL, NULL, NULL);
            if (nb <= 0) {
                  if (nb<0 && errno==EINTR) {
                        continue;
                  }
                  /* panic, we don't know what happened */
                  p_error("Unexpected error from select");
                  quit(0);
            }
            if (sockt>=0 && FD_ISSET(sockt, &read_set)) { 
                  /* There is data on sockt */
                  nb = read(sockt, buf, sizeof(buf));
                  if (nb <= 0) {
                        message("Connection closed. ^C to exit");
                        close(sockt);
                        sockt = -1;
                  }
                  else {
                        display(1, buf, nb);
                  }
            }
            if (FD_ISSET(0, &read_set)) {
                  k = dogetch();
                  if (k>=0 && sockt>=0) {
                        nb = 1;
                        buf[0] = k;
                        display(0, buf, nb);
                        while (write(sockt, buf, nb)==-1 && 
                               errno==EAGAIN)
                              ;
                  }
            }
      }
}


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