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