tstp.c revision 1.1.1.2
1 1.1 cgd /* 2 1.1.1.2 cgd * Copyright (c) 1981, 1993, 1994 3 1.1.1.2 cgd * The Regents of the University of California. All rights reserved. 4 1.1 cgd * 5 1.1 cgd * Redistribution and use in source and binary forms, with or without 6 1.1 cgd * modification, are permitted provided that the following conditions 7 1.1 cgd * are met: 8 1.1 cgd * 1. Redistributions of source code must retain the above copyright 9 1.1 cgd * notice, this list of conditions and the following disclaimer. 10 1.1 cgd * 2. Redistributions in binary form must reproduce the above copyright 11 1.1 cgd * notice, this list of conditions and the following disclaimer in the 12 1.1 cgd * documentation and/or other materials provided with the distribution. 13 1.1 cgd * 3. All advertising materials mentioning features or use of this software 14 1.1 cgd * must display the following acknowledgement: 15 1.1 cgd * This product includes software developed by the University of 16 1.1 cgd * California, Berkeley and its contributors. 17 1.1 cgd * 4. Neither the name of the University nor the names of its contributors 18 1.1 cgd * may be used to endorse or promote products derived from this software 19 1.1 cgd * without specific prior written permission. 20 1.1 cgd * 21 1.1 cgd * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 1.1 cgd * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 1.1 cgd * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 1.1 cgd * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 1.1 cgd * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 1.1 cgd * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 1.1 cgd * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 1.1 cgd * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 1.1 cgd * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 1.1 cgd * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 1.1 cgd * SUCH DAMAGE. 32 1.1 cgd */ 33 1.1 cgd 34 1.1 cgd #ifndef lint 35 1.1.1.2 cgd static char sccsid[] = "@(#)tstp.c 8.3 (Berkeley) 5/4/94"; 36 1.1 cgd #endif /* not lint */ 37 1.1 cgd 38 1.1.1.2 cgd #include <errno.h> 39 1.1.1.2 cgd #include <signal.h> 40 1.1.1.2 cgd #include <termios.h> 41 1.1.1.2 cgd #include <unistd.h> 42 1.1 cgd 43 1.1.1.2 cgd #include "curses.h" 44 1.1 cgd 45 1.1 cgd /* 46 1.1.1.2 cgd * stop_signal_handler -- 47 1.1.1.2 cgd * Handle stop signals. 48 1.1 cgd */ 49 1.1 cgd void 50 1.1.1.2 cgd __stop_signal_handler(signo) 51 1.1.1.2 cgd int signo; 52 1.1.1.2 cgd { 53 1.1.1.2 cgd struct termios save; 54 1.1.1.2 cgd sigset_t oset, set; 55 1.1.1.2 cgd 56 1.1.1.2 cgd /* Get the current terminal state (which the user may have changed). */ 57 1.1.1.2 cgd if (tcgetattr(STDIN_FILENO, &save)) 58 1.1.1.2 cgd return; 59 1.1.1.2 cgd 60 1.1.1.2 cgd /* 61 1.1.1.2 cgd * Block window change and timer signals. The latter is because 62 1.1.1.2 cgd * applications use timers to decide when to repaint the screen. 63 1.1.1.2 cgd */ 64 1.1.1.2 cgd (void)sigemptyset(&set); 65 1.1.1.2 cgd (void)sigaddset(&set, SIGALRM); 66 1.1.1.2 cgd (void)sigaddset(&set, SIGWINCH); 67 1.1.1.2 cgd (void)sigprocmask(SIG_BLOCK, &set, &oset); 68 1.1.1.2 cgd 69 1.1.1.2 cgd /* 70 1.1.1.2 cgd * End the window, which also resets the terminal state to the 71 1.1.1.2 cgd * original modes. 72 1.1.1.2 cgd */ 73 1.1.1.2 cgd endwin(); 74 1.1 cgd 75 1.1.1.2 cgd /* Unblock SIGTSTP. */ 76 1.1.1.2 cgd (void)sigemptyset(&set); 77 1.1.1.2 cgd (void)sigaddset(&set, SIGTSTP); 78 1.1.1.2 cgd (void)sigprocmask(SIG_UNBLOCK, &set, NULL); 79 1.1 cgd 80 1.1.1.2 cgd /* Stop ourselves. */ 81 1.1.1.2 cgd __restore_stophandler(); 82 1.1.1.2 cgd (void)kill(0, SIGTSTP); 83 1.1.1.2 cgd 84 1.1.1.2 cgd /* Time passes ... */ 85 1.1.1.2 cgd 86 1.1.1.2 cgd /* Reset the curses SIGTSTP signal handler. */ 87 1.1.1.2 cgd __set_stophandler(); 88 1.1.1.2 cgd 89 1.1.1.2 cgd /* save the new "default" terminal state */ 90 1.1.1.2 cgd (void)tcgetattr(STDIN_FILENO, &__orig_termios); 91 1.1.1.2 cgd 92 1.1.1.2 cgd /* Reset the terminal state to the mode just before we stopped. */ 93 1.1.1.2 cgd (void)tcsetattr(STDIN_FILENO, __tcaction ? 94 1.1.1.2 cgd TCSASOFT | TCSADRAIN : TCSADRAIN, &save); 95 1.1.1.2 cgd 96 1.1.1.2 cgd /* Restart the screen. */ 97 1.1.1.2 cgd __startwin(); 98 1.1.1.2 cgd 99 1.1.1.2 cgd /* Repaint the screen. */ 100 1.1 cgd wrefresh(curscr); 101 1.1.1.2 cgd 102 1.1.1.2 cgd /* Reset the signals. */ 103 1.1.1.2 cgd (void)sigprocmask(SIG_SETMASK, &oset, NULL); 104 1.1.1.2 cgd } 105 1.1.1.2 cgd 106 1.1.1.2 cgd static void (*otstpfn)() = SIG_DFL; 107 1.1.1.2 cgd 108 1.1.1.2 cgd /* 109 1.1.1.2 cgd * Set the TSTP handler. 110 1.1.1.2 cgd */ 111 1.1.1.2 cgd void 112 1.1.1.2 cgd __set_stophandler() 113 1.1.1.2 cgd { 114 1.1.1.2 cgd otstpfn = signal(SIGTSTP, __stop_signal_handler); 115 1.1.1.2 cgd } 116 1.1.1.2 cgd 117 1.1.1.2 cgd /* 118 1.1.1.2 cgd * Restore the TSTP handler. 119 1.1.1.2 cgd */ 120 1.1.1.2 cgd void 121 1.1.1.2 cgd __restore_stophandler() 122 1.1.1.2 cgd { 123 1.1.1.2 cgd (void)signal(SIGTSTP, otstpfn); 124 1.1 cgd } 125
Indexes created Thu Oct 02 10:09:58 GMT 2025