4.3BSD-Reno/src/lib/libcurses/tstp.c

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/*
 * Copyright (c) 1981 Regents of the University of California.
 * All rights reserved.
 *
 * 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[] = "@(#)tstp.c	5.5 (Berkeley) 6/1/90";
#endif /* not lint */

# include	<signal.h>

# include	"curses.ext"

/*
 * handle stop and start signals
 *
 * @(#)tstp.c	5.5 (Berkeley) 6/1/90
 */
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;
	ioctl(_tty_ch, TIOCSETP, &_tty);
	wrefresh(curscr);
# endif	SIGTSTP
}