tstp.c revision 1.11
1 1.11 phil /* $NetBSD: tstp.c,v 1.11 1997/11/13 00:40:27 phil Exp $ */ 2 1.9 mikel 3 1.1 cgd /* 4 1.8 cgd * Copyright (c) 1981, 1993, 1994 5 1.5 cgd * The Regents of the University of California. All rights reserved. 6 1.1 cgd * 7 1.1 cgd * Redistribution and use in source and binary forms, with or without 8 1.1 cgd * modification, are permitted provided that the following conditions 9 1.1 cgd * are met: 10 1.1 cgd * 1. Redistributions of source code must retain the above copyright 11 1.1 cgd * notice, this list of conditions and the following disclaimer. 12 1.1 cgd * 2. Redistributions in binary form must reproduce the above copyright 13 1.1 cgd * notice, this list of conditions and the following disclaimer in the 14 1.1 cgd * documentation and/or other materials provided with the distribution. 15 1.1 cgd * 3. All advertising materials mentioning features or use of this software 16 1.1 cgd * must display the following acknowledgement: 17 1.1 cgd * This product includes software developed by the University of 18 1.1 cgd * California, Berkeley and its contributors. 19 1.1 cgd * 4. Neither the name of the University nor the names of its contributors 20 1.1 cgd * may be used to endorse or promote products derived from this software 21 1.1 cgd * without specific prior written permission. 22 1.1 cgd * 23 1.1 cgd * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 1.1 cgd * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 1.1 cgd * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 1.1 cgd * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 1.1 cgd * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 1.1 cgd * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 1.1 cgd * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 1.1 cgd * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 1.1 cgd * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 1.1 cgd * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 1.1 cgd * SUCH DAMAGE. 34 1.1 cgd */ 35 1.1 cgd 36 1.9 mikel #include <sys/cdefs.h> 37 1.1 cgd #ifndef lint 38 1.9 mikel #if 0 39 1.8 cgd static char sccsid[] = "@(#)tstp.c 8.3 (Berkeley) 5/4/94"; 40 1.9 mikel #else 41 1.11 phil __RCSID("$NetBSD: tstp.c,v 1.11 1997/11/13 00:40:27 phil Exp $"); 42 1.9 mikel #endif 43 1.1 cgd #endif /* not lint */ 44 1.1 cgd 45 1.3 mycroft #include <errno.h> 46 1.3 mycroft #include <signal.h> 47 1.3 mycroft #include <termios.h> 48 1.3 mycroft #include <unistd.h> 49 1.1 cgd 50 1.8 cgd #include "curses.h" 51 1.5 cgd 52 1.1 cgd /* 53 1.5 cgd * stop_signal_handler -- 54 1.5 cgd * Handle stop signals. 55 1.1 cgd */ 56 1.1 cgd void 57 1.5 cgd __stop_signal_handler(signo) 58 1.3 mycroft int signo; 59 1.3 mycroft { 60 1.5 cgd sigset_t oset, set; 61 1.1 cgd 62 1.5 cgd /* 63 1.5 cgd * Block window change and timer signals. The latter is because 64 1.5 cgd * applications use timers to decide when to repaint the screen. 65 1.5 cgd */ 66 1.5 cgd (void)sigemptyset(&set); 67 1.5 cgd (void)sigaddset(&set, SIGALRM); 68 1.5 cgd (void)sigaddset(&set, SIGWINCH); 69 1.5 cgd (void)sigprocmask(SIG_BLOCK, &set, &oset); 70 1.5 cgd 71 1.5 cgd /* 72 1.5 cgd * End the window, which also resets the terminal state to the 73 1.5 cgd * original modes. 74 1.5 cgd */ 75 1.10 phil __stopwin(); 76 1.3 mycroft 77 1.5 cgd /* Unblock SIGTSTP. */ 78 1.3 mycroft (void)sigemptyset(&set); 79 1.5 cgd (void)sigaddset(&set, SIGTSTP); 80 1.3 mycroft (void)sigprocmask(SIG_UNBLOCK, &set, NULL); 81 1.5 cgd 82 1.5 cgd /* Stop ourselves. */ 83 1.5 cgd (void)kill(0, SIGTSTP); 84 1.3 mycroft 85 1.3 mycroft /* Time passes ... */ 86 1.3 mycroft 87 1.10 phil /* restart things */ 88 1.10 phil __restartwin(); 89 1.5 cgd 90 1.5 cgd /* Reset the signals. */ 91 1.5 cgd (void)sigprocmask(SIG_SETMASK, &oset, NULL); 92 1.5 cgd } 93 1.5 cgd 94 1.9 mikel static void (*otstpfn) __P((int)) = SIG_DFL; 95 1.5 cgd 96 1.5 cgd /* 97 1.5 cgd * Set the TSTP handler. 98 1.5 cgd */ 99 1.5 cgd void 100 1.5 cgd __set_stophandler() 101 1.5 cgd { 102 1.5 cgd otstpfn = signal(SIGTSTP, __stop_signal_handler); 103 1.5 cgd } 104 1.5 cgd 105 1.5 cgd /* 106 1.5 cgd * Restore the TSTP handler. 107 1.5 cgd */ 108 1.5 cgd void 109 1.5 cgd __restore_stophandler() 110 1.5 cgd { 111 1.5 cgd (void)signal(SIGTSTP, otstpfn); 112 1.10 phil } 113 1.10 phil 114 1.10 phil 115 1.10 phil /* To allow both SIGTSTP and endwin() to come back nicely, we provide 116 1.10 phil the following routines. */ 117 1.10 phil 118 1.11 phil static struct termios save_termios; 119 1.10 phil 120 1.10 phil int 121 1.10 phil __stopwin() 122 1.10 phil { 123 1.10 phil /* Get the current terminal state (which the user may have changed). */ 124 1.11 phil (void)tcgetattr(STDIN_FILENO, &save_termios); 125 1.10 phil 126 1.10 phil __restore_stophandler(); 127 1.10 phil 128 1.10 phil if (curscr != NULL) { 129 1.10 phil if (curscr->flags & __WSTANDOUT) { 130 1.10 phil tputs(SE, 0, __cputchar); 131 1.10 phil curscr->flags &= ~__WSTANDOUT; 132 1.10 phil } 133 1.10 phil __mvcur(curscr->cury, curscr->cury, curscr->maxy - 1, 0, 0); 134 1.10 phil } 135 1.10 phil 136 1.10 phil (void)tputs(VE, 0, __cputchar); 137 1.10 phil (void)tputs(TE, 0, __cputchar); 138 1.10 phil (void)fflush(stdout); 139 1.10 phil (void)setvbuf(stdout, NULL, _IOLBF, 0); 140 1.10 phil 141 1.10 phil return (tcsetattr(STDIN_FILENO, __tcaction ? 142 1.10 phil TCSASOFT | TCSADRAIN : TCSADRAIN, &__orig_termios) ? ERR : OK); 143 1.10 phil } 144 1.10 phil 145 1.10 phil 146 1.10 phil void 147 1.10 phil __restartwin() 148 1.10 phil { 149 1.10 phil /* Reset the curses SIGTSTP signal handler. */ 150 1.10 phil __set_stophandler(); 151 1.10 phil 152 1.10 phil /* save the new "default" terminal state */ 153 1.10 phil (void)tcgetattr(STDIN_FILENO, &__orig_termios); 154 1.10 phil 155 1.10 phil /* Reset the terminal state to the mode just before we stopped. */ 156 1.10 phil (void)tcsetattr(STDIN_FILENO, __tcaction ? 157 1.11 phil TCSASOFT | TCSADRAIN : TCSADRAIN, &save_termios); 158 1.10 phil 159 1.10 phil /* Restart the screen. */ 160 1.10 phil __startwin(); 161 1.11 phil 162 1.11 phil /* Repaint the screen. */ 163 1.11 phil wrefresh(curscr); 164 1.1 cgd } 165
Indexes created Mon Sep 22 21:09:42 GMT 2025