386BSD 0.1 development
[unix-history] / usr / src / lib / libcurses / tstp.c
/*
* Copyright (c) 1981 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.
*/
#ifndef lint
static char sccsid[] = "@(#)tstp.c 5.6 (Berkeley) 3/3/91";
#endif /* not lint */
# include <signal.h>
# include "curses.ext"
/*
* handle stop and start signals
*
* @(#)tstp.c 5.6 (Berkeley) 3/3/91
*/
void
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
}