/* $Copyright:	$
 * Copyright (c) 1984, 1985, 1986, 1987, 1988, 1989, 1990 
 * Sequent Computer Systems, Inc.   All rights reserved.
 *  
 * This software is furnished under a license and may be used
 * only in accordance with the terms of that license and with the
 * inclusion of the above copyright notice.   This software may not
 * be provided or otherwise made available to, or used by, any
 * other person.  No title to or ownership of the software is
 * hereby transferred.
 */

/* $Header: tstp.c 2.0 86/01/28 $ */

# include	<signal.h>

# include	"curses.ext"

/*
 * handle stop and start signals
 */
tstp() {

# ifdef SIGTSTP

	SGTTY	tty;
	int	omask;
# ifdef DEBUG
	if (outf)
		fflush(outf);
# endif
	tty = _tty;
	mvcur(0, COLS - 1, LINES - 1, 0);
	endwin();
	fflush(stdout);
	/* reset signal handler so kill below stops us */
	signal(SIGTSTP, SIG_DFL);
#define	mask(s)	(1 << ((s)-1))
	omask = sigsetmask(sigblock(0) &~ mask(SIGTSTP));
	kill(0, SIGTSTP);
	sigblock(mask(SIGTSTP));
	signal(SIGTSTP, tstp);
	_tty = tty;
	stty(_tty_ch, &_tty);
	wrefresh(curscr);
# endif	SIGTSTP
}
