/* $NetBSD: tstp.c,v 1.44 2018/10/18 07:53:13 roy Exp $ */ /* * 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. 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. */ #include #ifndef lint #if 0 static char sccsid[] = "@(#)tstp.c 8.3 (Berkeley) 5/4/94"; #else __RCSID("$NetBSD: tstp.c,v 1.44 2018/10/18 07:53:13 roy Exp $"); #endif #endif /* not lint */ #include #include #include #include #include #include #include "curses.h" #include "curses_private.h" static int tstp_set; static int winch_set; static void (*otstpfn)(int) = SIG_DFL; static struct sigaction owsa; #ifndef TCSASOFT #define TCSASOFT 0 #endif /* * stop_signal_handler -- * Handle stop signals. */ void __stop_signal_handler(/*ARGSUSED*/int signo) { sigset_t oset, set; /* * 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. */ __stopwin(); /* Unblock SIGTSTP. */ (void)sigemptyset(&set); (void)sigaddset(&set, SIGTSTP); (void)sigprocmask(SIG_UNBLOCK, &set, NULL); /* Stop ourselves. */ (void)kill(0, SIGTSTP); /* Time passes ... */ /* restart things */ __restartwin(); /* Reset the signals. */ (void)sigprocmask(SIG_SETMASK, &oset, NULL); } /* * Set the TSTP handler. */ void __set_stophandler(void) { #ifdef DEBUG __CTRACE(__CTRACE_MISC, "__set_stophandler: %d\n", tstp_set); #endif if (!tstp_set) { otstpfn = signal(SIGTSTP, __stop_signal_handler); tstp_set = 1; } } /* * Restore the TSTP handler. */ void __restore_stophandler(void) { #ifdef DEBUG __CTRACE(__CTRACE_MISC, "__restore_stophandler: %d\n", tstp_set); #endif if (tstp_set) { (void)signal(SIGTSTP, otstpfn); tstp_set = 0; } } /* * winch_signal_handler -- * Handle winch signals by pushing KEY_RESIZE into the input stream. */ void __winch_signal_handler(/*ARGSUSED*/int signo) { struct winsize win; if (ioctl(fileno(_cursesi_screen->outfd), TIOCGWINSZ, &win) != -1 && win.ws_row != 0 && win.ws_col != 0) { LINES = win.ws_row; COLS = win.ws_col; } /* * If there was a previous handler, call that, * otherwise tell getch() to send KEY_RESIZE. */ if (owsa.sa_handler != SIG_DFL && owsa.sa_handler != SIG_IGN && owsa.sa_handler != SIG_ERR && owsa.sa_handler != SIG_HOLD) owsa.sa_handler(signo); else _cursesi_screen->resized = 1; } /* * Set the WINCH handler. */ void __set_winchhandler(void) { #ifdef DEBUG __CTRACE(__CTRACE_MISC, "__set_winchhandler: %d\n", winch_set); #endif if (!winch_set) { struct sigaction sa; sa.sa_handler = __winch_signal_handler; sa.sa_flags = 0; sigemptyset(&sa.sa_mask); sigaction(SIGWINCH, &sa, &owsa); winch_set = 1; #ifdef DEBUG __CTRACE(__CTRACE_MISC, "__set_winchhandler: owsa.sa_handler=%p\n", owsa.sa_handler); #endif } } /* * Restore the WINCH handler. */ void __restore_winchhandler(void) { #ifdef DEBUG __CTRACE(__CTRACE_MISC, "__restore_winchhandler: %d\n", winch_set); #endif if (winch_set > 0) { struct sigaction cwsa; sigaction(SIGWINCH, NULL, &cwsa); if (cwsa.sa_handler == owsa.sa_handler) { sigaction(SIGWINCH, &owsa, NULL); winch_set = 0; } else { /* * We're now using the programs WINCH handler, * so don't restore the previous one. */ winch_set = -1; #ifdef DEBUG __CTRACE(__CTRACE_MISC, "cwsa.sa_handler = %p\n", cwsa.sa_handler); #endif } } } /* To allow both SIGTSTP and endwin() to come back nicely, we provide the following routines. */ int __stopwin(void) { #ifdef DEBUG __CTRACE(__CTRACE_MISC, "__stopwin\n"); #endif if (_cursesi_screen == NULL) return ERR; if (_cursesi_screen->endwin) return OK; /* Get the current terminal state (which the user may have changed). */ (void)tcgetattr(fileno(_cursesi_screen->infd), &_cursesi_screen->save_termios); __restore_stophandler(); __restore_winchhandler(); if (curscr != NULL) { __unsetattr(0); __mvcur((int)curscr->cury, (int)curscr->curx, (int)curscr->maxy - 1, 0, 0); } if (meta_on != NULL) (void)tputs(meta_on, 0, __cputchar); if ((curscr != NULL) && (curscr->flags & __KEYPAD)) (void)tputs(keypad_local, 0, __cputchar); (void)tputs(cursor_normal, 0, __cputchar); (void)tputs(exit_ca_mode, 0, __cputchar); (void)fflush(_cursesi_screen->outfd); #ifdef BSD (void)setvbuf(_cursesi_screen->outfd, NULL, _IOLBF, 0); #endif _cursesi_screen->endwin = 1; return tcsetattr(fileno(_cursesi_screen->infd), TCSASOFT | TCSADRAIN, &_cursesi_screen->orig_termios) ? ERR : OK; } void __restartwin(void) { struct winsize win; int nlines, ncols; #ifdef DEBUG __CTRACE(__CTRACE_MISC, "__restartwin\n"); #endif if (!_cursesi_screen->endwin) return; /* Reset the curses SIGTSTP and SIGWINCH signal handlers. */ __set_stophandler(); __set_winchhandler(); /* * Check to see if the window size has changed. * If the application didn't update LINES and COLS, * set the * resized flag to tell getch() to push KEY_RESIZE. * Update curscr (which also updates __virtscr) and stdscr * to match the new size. */ if (ioctl(fileno(_cursesi_screen->outfd), TIOCGWINSZ, &win) != -1 && win.ws_row != 0 && win.ws_col != 0) { if (win.ws_row != LINES) { LINES = win.ws_row; _cursesi_screen->resized = 1; } if (win.ws_col != COLS) { COLS = win.ws_col; _cursesi_screen->resized = 1; } } /* * We need to make local copies of LINES and COLS, otherwise we * could lose if they are changed between wresize() calls. */ nlines = LINES; ncols = COLS; if (curscr->maxy != nlines || curscr->maxx != ncols) wresize(curscr, nlines, ncols); if (stdscr->maxy != nlines || stdscr->maxx != ncols) wresize(stdscr, nlines, ncols); /* save the new "default" terminal state */ (void)tcgetattr(fileno(_cursesi_screen->infd), &_cursesi_screen->orig_termios); /* Reset the terminal state to the mode just before we stopped. */ (void)tcsetattr(fileno(_cursesi_screen->infd), TCSASOFT | TCSADRAIN, &_cursesi_screen->save_termios); /* Restore colours */ __restore_colors(); /* Reset meta */ __restore_meta_state(); /* Restart the screen. */ __startwin(_cursesi_screen); /* Reset cursor visibility */ __restore_cursor_vis(); /* Repaint the screen. */ wrefresh(curscr); } int def_prog_mode(void) { if (_cursesi_screen->endwin) return ERR; return tcgetattr(fileno(_cursesi_screen->infd), &_cursesi_screen->save_termios) ? ERR : OK; } int reset_prog_mode(void) { return tcsetattr(fileno(_cursesi_screen->infd), TCSASOFT | TCSADRAIN, &_cursesi_screen->save_termios) ? ERR : OK; } int def_shell_mode(void) { return tcgetattr(fileno(_cursesi_screen->infd), &_cursesi_screen->orig_termios) ? ERR : OK; } int reset_shell_mode(void) { return __stopwin(); }