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tstp.c revision 1.3 
      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	5.7 (Berkeley) 8/23/92";*/
     36 static char rcsid[] = "$Id: tstp.c,v 1.3 1993/08/07 05:49:09 mycroft Exp $";
     37 #endif /* not lint */
     38 
     39 #include <curses.h>
     40 #include <errno.h>
     41 #include <signal.h>
     42 #include <termios.h>
     43 #include <unistd.h>
     44 
     45 /*
     46  * tstp --
     47  *	Handle stop and start signals.
     48  */
     49 void
     50 tstp(signo)
     51 	int signo;
     52 {
     53 	struct termios save;
     54 	sigset_t set;
     55 
     56 	/* Get the current terminal state. */
     57 	if (tcgetattr(STDIN_FILENO, &save))
     58 		return;
     59 
     60 	/* Move the cursor to the end of the screen. */
     61 	mvcur(0, COLS - 1, LINES - 1, 0);
     62 
     63 	/* End the window. */
     64 	endwin();
     65 
     66 	/* Stop ourselves. */
     67 	(void)sigemptyset(&set);
     68 	(void)sigaddset(&set, SIGTSTP);
     69 	(void)sigprocmask(SIG_UNBLOCK, &set, NULL);
     70 	(void)signal(SIGTSTP, SIG_DFL);
     71 	(void)kill(0, SIGTSTP);
     72 
     73 	/* Time passes ... */
     74 
     75 	/* Reset the signal handler. */
     76 	(void)signal(SIGTSTP, tstp);
     77 
     78 	/* Reset the terminal state. */
     79 	(void)tcsetattr(STDIN_FILENO, TCSADRAIN, &save);
     80 
     81 	/* Restart the screen. */
     82 	wrefresh(curscr);
     83 }
     84