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- /*
- * 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;
- #ifdef POSIX
- sigset_t mask, omask;
- #else
- int omask;
- #endif
- # 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);
- #ifdef POSIX
- sigemptyset(&mask);
- sigaddset(&mask, SIGTSTP);
- sigprocmask(SIG_UNBLOCK, &mask, &omask);
- kill(0, SIGTSTP);
- sigprocmask(SIG_SETMASK, &omask, 0);
- #else
- #define mask(s) (1 << ((s)-1))
- omask = sigsetmask(sigblock(0) &~ mask(SIGTSTP));
- kill(0, SIGTSTP);
- sigblock(mask(SIGTSTP));
- #endif
- signal(SIGTSTP, tstp);
- _tty = tty;
- #ifdef POSIX
- tcsetattr(_tty_ch, TCSADRAIN, &_tty);
- #else
- ioctl(_tty_ch, TIOCSETP, &_tty);
- #endif
- wrefresh(curscr);
- # endif SIGTSTP
- }
-