4.3BSD-Reno/src/usr.bin/window/wwtty.c

/*
 * Copyright (c) 1983 Regents of the University of California.
 * All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Edward Wang at The University of California, Berkeley.
 *
 * Redistribution and use in source and binary forms are permitted provided
 * that: (1) source distributions retain this entire copyright notice and
 * comment, and (2) distributions including binaries display the following
 * acknowledgement:  ``This product includes software developed by the
 * University of California, Berkeley and its contributors'' in the
 * documentation or other materials provided with the distribution and in
 * all advertising materials mentioning features or use of this software.
 * 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 ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 */

#ifndef lint
static char sccsid[] = "@(#)wwtty.c	3.16 (Berkeley) 6/6/90";
#endif /* not lint */

#include "ww.h"
#include <fcntl.h>

wwgettty(d, t)
register struct ww_tty *t;
{
#ifndef POSIX_TTY
	if (ioctl(d, TIOCGETP, (char *)&t->ww_sgttyb) < 0)
		goto bad;
	if (ioctl(d, TIOCGETC, (char *)&t->ww_tchars) < 0)
		goto bad;
	if (ioctl(d, TIOCGLTC, (char *)&t->ww_ltchars) < 0)
		goto bad;
	if (ioctl(d, TIOCLGET, (char *)&t->ww_lmode) < 0)
		goto bad;
	if (ioctl(d, TIOCGETD, (char *)&t->ww_ldisc) < 0)
		goto bad;
#else
	if (tcgetattr(d, &t->ww_termios) < 0)
		goto bad;
#endif
	if ((t->ww_fflags = fcntl(d, F_GETFL, 0)) < 0)
		goto bad;
	return 0;
bad:
	wwerrno = WWE_SYS;
	return -1;
}

/*
 * Set the modes of tty 'd' to 't'
 * 'o' is the current modes.  We set the line discipline only if
 * it changes, to avoid unnecessary flushing of typeahead.
 */
wwsettty(d, t, o)
register struct ww_tty *t, *o;
{
#ifndef POSIX_TTY
	/* for buggy tty driver that doesn't wait for output to drain */
	int i;
	while (ioctl(d, TIOCOUTQ, &i) >= 0 && i > 0)
		usleep(100000);
	if (ioctl(d, TIOCSETN, (char *)&t->ww_sgttyb) < 0)
		goto bad;
	if (ioctl(d, TIOCSETC, (char *)&t->ww_tchars) < 0)
		goto bad;
	if (ioctl(d, TIOCSLTC, (char *)&t->ww_ltchars) < 0)
		goto bad;
	if (ioctl(d, TIOCLSET, (char *)&t->ww_lmode) < 0)
		goto bad;
	if ((o == 0 || t->ww_ldisc != o->ww_ldisc) &&
	    ioctl(d, TIOCSETD, (char *)&t->ww_ldisc) < 0)
		goto bad;
#else
	if (tcsetattr(d, TCSADRAIN, &t->ww_termios) < 0)
		goto bad;
#endif
	if (fcntl(d, F_SETFL, t->ww_fflags) < 0)
		goto bad;
	return 0;
bad:
	wwerrno = WWE_SYS;
	return -1;
}