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tstp.c revision 1.2 
      1 /*
      2  * Copyright (c) 1981 Regents of the University of California.
      3  * All rights reserved.
      4  *
      5  * Redistribution and use in source and binary forms, with or without
      6  * modification, are permitted provided that the following conditions
      7  * are met:
      8  * 1. Redistributions of source code must retain the above copyright
      9  *    notice, this list of conditions and the following disclaimer.
     10  * 2. Redistributions in binary form must reproduce the above copyright
     11  *    notice, this list of conditions and the following disclaimer in the
     12  *    documentation and/or other materials provided with the distribution.
     13  * 3. All advertising materials mentioning features or use of this software
     14  *    must display the following acknowledgement:
     15  *	This product includes software developed by the University of
     16  *	California, Berkeley and its contributors.
     17  * 4. Neither the name of the University nor the names of its contributors
     18  *    may be used to endorse or promote products derived from this software
     19  *    without specific prior written permission.
     20  *
     21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     31  * SUCH DAMAGE.
     32  */
     33 
     34 #ifndef lint
     35 /*static char sccsid[] = "from: @(#)tstp.c	5.6 (Berkeley) 3/3/91";*/
     36 static char rcsid[] = "$Id: tstp.c,v 1.2 1993/08/01 18:35:20 mycroft Exp $";
     37 #endif /* not lint */
     38 
     39 # include	<signal.h>
     40 
     41 # include	"curses.ext"
     42 
     43 /*
     44  * handle stop and start signals
     45  *
     46  * @(#)tstp.c	5.6 (Berkeley) 3/3/91
     47  */
     48 void
     49 tstp() {
     50 
     51 # ifdef SIGTSTP
     52 
     53 	SGTTY	tty;
     54 	int	omask;
     55 # ifdef DEBUG
     56 	if (outf)
     57 		fflush(outf);
     58 # endif
     59 	tty = _tty;
     60 	mvcur(0, COLS - 1, LINES - 1, 0);
     61 	endwin();
     62 	fflush(stdout);
     63 	/* reset signal handler so kill below stops us */
     64 	signal(SIGTSTP, SIG_DFL);
     65 #define	mask(s)	(1 << ((s)-1))
     66 	omask = sigsetmask(sigblock(0) &~ mask(SIGTSTP));
     67 	kill(0, SIGTSTP);
     68 	sigblock(mask(SIGTSTP));
     69 	signal(SIGTSTP, tstp);
     70 	_tty = tty;
     71 	ioctl(_tty_ch, TIOCSETP, &_tty);
     72 	wrefresh(curscr);
     73 # endif	SIGTSTP
     74 }
     75