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[] = "@(#)tstp.c 5.6 (Berkeley) 3/3/91"; 36 #endif /* not lint */ 37 38 # include <signal.h> 39 40 # include "curses.ext" 41 42 /* 43 * handle stop and start signals 44 * 45 * @(#)tstp.c 5.6 (Berkeley) 3/3/91 46 */ 47 void 48 tstp() { 49 50 # ifdef SIGTSTP 51 52 SGTTY tty; 53 int omask; 54 # ifdef DEBUG 55 if (outf) 56 fflush(outf); 57 # endif 58 tty = _tty; 59 mvcur(0, COLS - 1, LINES - 1, 0); 60 endwin(); 61 fflush(stdout); 62 /* reset signal handler so kill below stops us */ 63 signal(SIGTSTP, SIG_DFL); 64 #define mask(s) (1 << ((s)-1)) 65 omask = sigsetmask(sigblock(0) &~ mask(SIGTSTP)); 66 kill(0, SIGTSTP); 67 sigblock(mask(SIGTSTP)); 68 signal(SIGTSTP, tstp); 69 _tty = tty; 70 ioctl(_tty_ch, TIOCSETP, &_tty); 71 wrefresh(curscr); 72 # endif SIGTSTP 73 } 74