/* * Copyright (c) 1981, 1993, 1994 * The Regents of the University of California. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Berkeley and its contributors. * 4. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #ifndef lint static char sccsid[] = "@(#)tstp.c 8.3 (Berkeley) 5/4/94"; #endif /* not lint */ #include <errno.h> #include <signal.h> #include <termios.h> #include <unistd.h> #include "curses.h" /* * stop_signal_handler -- * Handle stop signals. */ void __stop_signal_handler(signo) int signo; { struct termios save; sigset_t oset, set; /* Get the current terminal state (which the user may have changed). */ if (tcgetattr(STDIN_FILENO, &save)) return; /* * Block window change and timer signals. The latter is because * applications use timers to decide when to repaint the screen. */ (void)sigemptyset(&set); (void)sigaddset(&set, SIGALRM); (void)sigaddset(&set, SIGWINCH); (void)sigprocmask(SIG_BLOCK, &set, &oset); /* * End the window, which also resets the terminal state to the * original modes. */ endwin(); /* Unblock SIGTSTP. */ (void)sigemptyset(&set); (void)sigaddset(&set, SIGTSTP); (void)sigprocmask(SIG_UNBLOCK, &set, NULL); /* Stop ourselves. */ __restore_stophandler(); (void)kill(0, SIGTSTP); /* Time passes ... */ /* Reset the curses SIGTSTP signal handler. */ __set_stophandler(); /* save the new "default" terminal state */ (void)tcgetattr(STDIN_FILENO, &__orig_termios); /* Reset the terminal state to the mode just before we stopped. */ (void)tcsetattr(STDIN_FILENO, __tcaction ? TCSASOFT | TCSADRAIN : TCSADRAIN, &save); /* Restart the screen. */ __startwin(); /* Repaint the screen. */ wrefresh(curscr); /* Reset the signals. */ (void)sigprocmask(SIG_SETMASK, &oset, NULL); } static void (*otstpfn)() = SIG_DFL; /* * Set the TSTP handler. */ void __set_stophandler() { otstpfn = signal(SIGTSTP, __stop_signal_handler); } /* * Restore the TSTP handler. */ void __restore_stophandler() { (void)signal(SIGTSTP, otstpfn); }