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tstp.c revision 1.13.6.1 
      1 /*	$NetBSD: tstp.c,v 1.13.6.1 2000/01/09 20:43:22 jdc Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1981, 1993, 1994
      5  *	The Regents of the University of California.  All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  * 3. All advertising materials mentioning features or use of this software
     16  *    must display the following acknowledgement:
     17  *	This product includes software developed by the University of
     18  *	California, Berkeley and its contributors.
     19  * 4. Neither the name of the University nor the names of its contributors
     20  *    may be used to endorse or promote products derived from this software
     21  *    without specific prior written permission.
     22  *
     23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     33  * SUCH DAMAGE.
     34  */
     35 
     36 #include <sys/cdefs.h>
     37 #ifndef lint
     38 #if 0
     39 static char sccsid[] = "@(#)tstp.c	8.3 (Berkeley) 5/4/94";
     40 #else
     41 __RCSID("$NetBSD: tstp.c,v 1.13.6.1 2000/01/09 20:43:22 jdc Exp $");
     42 #endif
     43 #endif				/* not lint */
     44 
     45 #include <errno.h>
     46 #include <signal.h>
     47 #include <termios.h>
     48 #include <unistd.h>
     49 
     50 #include "curses.h"
     51 
     52 /*
     53  * stop_signal_handler --
     54  *	Handle stop signals.
     55  */
     56 void
     57 __stop_signal_handler(/*ARGSUSED*/signo)
     58 	int	signo;
     59 {
     60 	sigset_t oset, set;
     61 
     62 	/*
     63 	 * Block window change and timer signals.  The latter is because
     64 	 * applications use timers to decide when to repaint the screen.
     65 	 */
     66 	(void) sigemptyset(&set);
     67 	(void) sigaddset(&set, SIGALRM);
     68 	(void) sigaddset(&set, SIGWINCH);
     69 	(void) sigprocmask(SIG_BLOCK, &set, &oset);
     70 
     71 	/*
     72 	 * End the window, which also resets the terminal state to the
     73 	 * original modes.
     74 	 */
     75 	__stopwin();
     76 
     77 	/* Unblock SIGTSTP. */
     78 	(void) sigemptyset(&set);
     79 	(void) sigaddset(&set, SIGTSTP);
     80 	(void) sigprocmask(SIG_UNBLOCK, &set, NULL);
     81 
     82 	/* Stop ourselves. */
     83 	(void) kill(0, SIGTSTP);
     84 
     85 	/* Time passes ... */
     86 
     87 	/* restart things */
     88 	__restartwin();
     89 
     90 	/* Reset the signals. */
     91 	(void) sigprocmask(SIG_SETMASK, &oset, NULL);
     92 }
     93 
     94 static void (*otstpfn)
     95 __P((int)) = SIG_DFL;
     96 
     97 /*
     98  * Set the TSTP handler.
     99  */
    100 void
    101 __set_stophandler()
    102 {
    103 	otstpfn = signal(SIGTSTP, __stop_signal_handler);
    104 }
    105 
    106 /*
    107  * Restore the TSTP handler.
    108  */
    109 void
    110 __restore_stophandler()
    111 {
    112 	(void) signal(SIGTSTP, otstpfn);
    113 }
    114 
    115 
    116 /* To allow both SIGTSTP and endwin() to come back nicely, we provide
    117    the following routines. */
    118 
    119 static struct termios save_termios;
    120 
    121 int
    122 __stopwin()
    123 {
    124 	/* Get the current terminal state (which the user may have changed). */
    125 	(void) tcgetattr(STDIN_FILENO, &save_termios);
    126 
    127 	__restore_stophandler();
    128 
    129 	if (curscr != NULL) {
    130 		if (curscr->wattr & __STANDOUT && SE != NULL) {
    131 			tputs(SE, 0, __cputchar);
    132 			curscr->wattr &= ~__STANDOUT;
    133 			if (UE != NULL && !strcmp(SE, UE)) {
    134 				curscr->wattr &= ~__UNDERSCORE;
    135 			}
    136 			if (ME != NULL && !strcmp(SE, ME)) {
    137 				curscr->wattr &= ~__TERMATTR;
    138 			}
    139 
    140 		}
    141 		if (curscr->wattr & __UNDERSCORE && UE != NULL) {
    142 			tputs(UE, 0, __cputchar);
    143 			curscr->wattr &= ~__UNDERSCORE;
    144 			if (ME != NULL && !strcmp(UE, ME)) {
    145 				curscr->wattr &= ~__TERMATTR;
    146 			}
    147 		}
    148 		if (curscr->wattr & __TERMATTR && ME != NULL) {
    149 			tputs(SE, 0, __cputchar);
    150 			curscr->wattr &= ~__TERMATTR;
    151 		}
    152 		__mvcur((int) curscr->cury, (int) curscr->curx, (int) curscr->maxy - 1, 0, 0);
    153 	}
    154 
    155 	(void) tputs(KE, 0, __cputchar);
    156 	(void) tputs(VE, 0, __cputchar);
    157 	(void) tputs(TE, 0, __cputchar);
    158 	(void) fflush(stdout);
    159 	(void) setvbuf(stdout, NULL, _IOLBF, (size_t) 0);
    160 
    161 	return (tcsetattr(STDIN_FILENO, __tcaction ?
    162 	    TCSASOFT | TCSADRAIN : TCSADRAIN, &__orig_termios) ? ERR : OK);
    163 }
    164 
    165 
    166 void
    167 __restartwin()
    168 {
    169 	/* Reset the curses SIGTSTP signal handler. */
    170 	__set_stophandler();
    171 
    172 	/* save the new "default" terminal state */
    173 	(void) tcgetattr(STDIN_FILENO, &__orig_termios);
    174 
    175 	/* Reset the terminal state to the mode just before we stopped. */
    176 	(void) tcsetattr(STDIN_FILENO, __tcaction ?
    177 	    TCSASOFT | TCSADRAIN : TCSADRAIN, &save_termios);
    178 
    179 	/* Restart the screen. */
    180 	__startwin();
    181 
    182 	/* Repaint the screen. */
    183 	wrefresh(curscr);
    184 }
    185