309 lines
7.1 KiB
C
309 lines
7.1 KiB
C
/* $NetBSD: tstp.c,v 1.32 2004/03/25 07:35:40 jdc Exp $ */
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/*
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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. 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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#include <sys/cdefs.h>
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#ifndef lint
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#if 0
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static char sccsid[] = "@(#)tstp.c 8.3 (Berkeley) 5/4/94";
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#else
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__RCSID("$NetBSD: tstp.c,v 1.32 2004/03/25 07:35:40 jdc Exp $");
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#endif
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#endif /* not lint */
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#include <sys/ioctl.h>
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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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#include "curses_private.h"
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static int tstp_set = 0;
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static int winch_set = 0;
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static void (*otstpfn)
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__P((int)) = SIG_DFL;
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static struct sigaction owsa;
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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(/*ARGSUSED*/int signo)
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{
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sigset_t oset, set;
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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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__stopwin();
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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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(void) kill(0, SIGTSTP);
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/* Time passes ... */
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/* restart things */
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__restartwin();
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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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/*
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* Set the TSTP handler.
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*/
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void
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__set_stophandler(void)
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{
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#ifdef DEBUG
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__CTRACE("__set_stophandler: %d\n", tstp_set);
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#endif
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if (!tstp_set) {
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otstpfn = signal(SIGTSTP, __stop_signal_handler);
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tstp_set = 1;
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}
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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(void)
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{
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#ifdef DEBUG
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__CTRACE("__restore_stophandler: %d\n", tstp_set);
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#endif
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if (tstp_set) {
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(void) signal(SIGTSTP, otstpfn);
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tstp_set = 0;
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}
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}
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/*
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* winch_signal_handler --
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* Handle winch signals by pushing KEY_RESIZE into the input stream.
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*/
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void
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__winch_signal_handler(/*ARGSUSED*/int signo)
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{
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struct winsize win;
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if (ioctl(fileno(_cursesi_screen->outfd), TIOCGWINSZ, &win) != -1 &&
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win.ws_row != 0 && win.ws_col != 0) {
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LINES = win.ws_row;
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COLS = win.ws_col;
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}
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/*
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* If there was a previous handler, call that,
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* otherwise tell getch() to send KEY_RESIZE.
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*/
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if (owsa.sa_handler != NULL)
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owsa.sa_handler(signo);
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else
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_cursesi_screen->resized = 1;
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}
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/*
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* Set the WINCH handler.
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*/
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void
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__set_winchhandler(void)
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{
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#ifdef DEBUG
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__CTRACE("__set_winchhandler: %d\n", winch_set);
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#endif
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if (!winch_set) {
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struct sigaction sa;
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sa.sa_handler = __winch_signal_handler;
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sa.sa_flags = 0;
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sigemptyset(&sa.sa_mask);
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sigaction(SIGWINCH, &sa, &owsa);
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winch_set = 1;
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}
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}
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/*
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* Restore the WINCH handler.
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*/
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void
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__restore_winchhandler(void)
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{
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#ifdef DEBUG
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__CTRACE("__restore_winchhandler: %d\n", winch_set);
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#endif
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if (winch_set) {
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sigaction(SIGWINCH, &owsa, NULL);
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winch_set = 0;
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}
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}
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/* To allow both SIGTSTP and endwin() to come back nicely, we provide
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the following routines. */
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int
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__stopwin(void)
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{
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if (_cursesi_screen->endwin)
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return OK;
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/* Get the current terminal state (which the user may have changed). */
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(void) tcgetattr(fileno(_cursesi_screen->infd),
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&_cursesi_screen->save_termios);
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__restore_stophandler();
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__restore_winchhandler();
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if (curscr != NULL) {
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__unsetattr(0);
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__mvcur((int) curscr->cury, (int) curscr->curx, (int) curscr->maxy - 1, 0, 0);
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}
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if (__tc_mo != NULL)
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(void) tputs(__tc_mo, 0, __cputchar);
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if ((curscr != NULL) && (curscr->flags & __KEYPAD))
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(void) tputs(__tc_ke, 0, __cputchar);
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(void) tputs(__tc_ve, 0, __cputchar);
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(void) tputs(__tc_te, 0, __cputchar);
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(void) fflush(_cursesi_screen->outfd);
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(void) setvbuf(_cursesi_screen->outfd, NULL, _IOLBF, (size_t) 0);
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_cursesi_screen->endwin = 1;
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return (tcsetattr(fileno(_cursesi_screen->infd),
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__tcaction ? TCSASOFT | TCSADRAIN : TCSADRAIN,
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&_cursesi_screen->orig_termios) ? ERR : OK);
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}
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void
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__restartwin(void)
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{
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struct winsize win;
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if (!_cursesi_screen->endwin)
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return;
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/* Reset the curses SIGTSTP and SIGWINCH signal handlers. */
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__set_stophandler();
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__set_winchhandler();
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/* Check to see if the window size has changed */
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if (ioctl(fileno(_cursesi_screen->outfd), TIOCGWINSZ, &win) != -1 &&
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win.ws_row != 0 && win.ws_col != 0) {
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if (win.ws_row != LINES) {
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LINES = win.ws_row;
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_cursesi_screen->resized = 1;
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}
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if (win.ws_col != COLS) {
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COLS = win.ws_col;
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_cursesi_screen->resized = 1;
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}
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}
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/* save the new "default" terminal state */
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(void) tcgetattr(fileno(_cursesi_screen->infd),
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&_cursesi_screen->orig_termios);
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/* Reset the terminal state to the mode just before we stopped. */
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(void) tcsetattr(fileno(_cursesi_screen->infd),
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__tcaction ? TCSASOFT | TCSADRAIN : TCSADRAIN,
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&_cursesi_screen->save_termios);
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/* Restore colours */
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__restore_colors();
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/* Reset meta */
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__restore_meta_state();
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/* Restart the screen. */
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__startwin(_cursesi_screen);
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/* Reset cursor visibility */
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__restore_cursor_vis();
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/* Repaint the screen. */
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wrefresh(curscr);
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}
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int
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def_prog_mode(void)
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{
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if (_cursesi_screen->endwin)
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return ERR;
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return (tcgetattr(fileno(_cursesi_screen->infd),
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&_cursesi_screen->save_termios) ? ERR : OK);
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}
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int
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reset_prog_mode(void)
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{
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return tcsetattr(fileno(_cursesi_screen->infd),
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__tcaction ? TCSASOFT | TCSADRAIN : TCSADRAIN,
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&_cursesi_screen->save_termios) ? ERR : OK;
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}
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int
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def_shell_mode(void)
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{
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return (tcgetattr(fileno(_cursesi_screen->infd),
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&_cursesi_screen->orig_termios) ? ERR : OK);
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}
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int
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reset_shell_mode(void)
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{
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return (__stopwin());
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}
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