1 /* $NetBSD: tstp.c,v 1.34 2006/08/25 17:04:32 jdc Exp $ */ 2 3 /* 4 * Copyright (c) 1981, 1993, 1994 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #include <sys/cdefs.h> 33 #ifndef lint 34 #if 0 35 static char sccsid[] = "@(#)tstp.c 8.3 (Berkeley) 5/4/94"; 36 #else 37 __RCSID("$NetBSD: tstp.c,v 1.34 2006/08/25 17:04:32 jdc Exp $"); 38 #endif 39 #endif /* not lint */ 40 41 #include <sys/ioctl.h> 42 43 #include <errno.h> 44 #include <signal.h> 45 #include <termios.h> 46 #include <unistd.h> 47 48 #include "curses.h" 49 #include "curses_private.h" 50 51 static int tstp_set = 0; 52 static int winch_set = 0; 53 54 static void (*otstpfn) 55 __P((int)) = SIG_DFL; 56 57 static struct sigaction owsa; 58 59 /* 60 * stop_signal_handler -- 61 * Handle stop signals. 62 */ 63 void 64 __stop_signal_handler(/*ARGSUSED*/int signo) 65 { 66 sigset_t oset, set; 67 68 /* 69 * Block window change and timer signals. The latter is because 70 * applications use timers to decide when to repaint the screen. 71 */ 72 (void) sigemptyset(&set); 73 (void) sigaddset(&set, SIGALRM); 74 (void) sigaddset(&set, SIGWINCH); 75 (void) sigprocmask(SIG_BLOCK, &set, &oset); 76 77 /* 78 * End the window, which also resets the terminal state to the 79 * original modes. 80 */ 81 __stopwin(); 82 83 /* Unblock SIGTSTP. */ 84 (void) sigemptyset(&set); 85 (void) sigaddset(&set, SIGTSTP); 86 (void) sigprocmask(SIG_UNBLOCK, &set, NULL); 87 88 /* Stop ourselves. */ 89 (void) kill(0, SIGTSTP); 90 91 /* Time passes ... */ 92 93 /* restart things */ 94 __restartwin(); 95 96 /* Reset the signals. */ 97 (void) sigprocmask(SIG_SETMASK, &oset, NULL); 98 } 99 100 /* 101 * Set the TSTP handler. 102 */ 103 void 104 __set_stophandler(void) 105 { 106 #ifdef DEBUG 107 __CTRACE("__set_stophandler: %d\n", tstp_set); 108 #endif 109 if (!tstp_set) { 110 otstpfn = signal(SIGTSTP, __stop_signal_handler); 111 tstp_set = 1; 112 } 113 } 114 115 /* 116 * Restore the TSTP handler. 117 */ 118 void 119 __restore_stophandler(void) 120 { 121 #ifdef DEBUG 122 __CTRACE("__restore_stophandler: %d\n", tstp_set); 123 #endif 124 if (tstp_set) { 125 (void) signal(SIGTSTP, otstpfn); 126 tstp_set = 0; 127 } 128 } 129 130 /* 131 * winch_signal_handler -- 132 * Handle winch signals by pushing KEY_RESIZE into the input stream. 133 */ 134 void 135 __winch_signal_handler(/*ARGSUSED*/int signo) 136 { 137 struct winsize win; 138 139 if (ioctl(fileno(_cursesi_screen->outfd), TIOCGWINSZ, &win) != -1 && 140 win.ws_row != 0 && win.ws_col != 0) { 141 LINES = win.ws_row; 142 COLS = win.ws_col; 143 } 144 /* 145 * If there was a previous handler, call that, 146 * otherwise tell getch() to send KEY_RESIZE. 147 */ 148 if (owsa.sa_handler != NULL) 149 owsa.sa_handler(signo); 150 else 151 _cursesi_screen->resized = 1; 152 } 153 154 /* 155 * Set the WINCH handler. 156 */ 157 void 158 __set_winchhandler(void) 159 { 160 #ifdef DEBUG 161 __CTRACE("__set_winchhandler: %d\n", winch_set); 162 #endif 163 if (!winch_set) { 164 struct sigaction sa; 165 166 sa.sa_handler = __winch_signal_handler; 167 sa.sa_flags = 0; 168 sigemptyset(&sa.sa_mask); 169 sigaction(SIGWINCH, &sa, &owsa); 170 winch_set = 1; 171 #ifdef DEBUG 172 __CTRACE("__set_winchhandler: owsa.sa_handler=%p\n", 173 owsa.sa_handler); 174 #endif 175 } 176 } 177 178 /* 179 * Restore the WINCH handler. 180 */ 181 void 182 __restore_winchhandler(void) 183 { 184 #ifdef DEBUG 185 __CTRACE("__restore_winchhandler: %d\n", winch_set); 186 #endif 187 if (winch_set > 0) { 188 struct sigaction cwsa; 189 190 sigaction(SIGWINCH, NULL, &cwsa); 191 if (cwsa.sa_handler == owsa.sa_handler) { 192 sigaction(SIGWINCH, &owsa, NULL); 193 winch_set = 0; 194 } else { 195 /* 196 * We're now using the programs WINCH handler, 197 * so don't restore the previous one. 198 */ 199 winch_set = -1; 200 #ifdef DEBUG 201 __CTRACE("cwsa.sa_handler = %p\n", cwsa.sa_handler); 202 #endif 203 } 204 } 205 } 206 207 /* To allow both SIGTSTP and endwin() to come back nicely, we provide 208 the following routines. */ 209 210 int 211 __stopwin(void) 212 { 213 #ifdef DEBUG 214 __CTRACE("__stopwin\n"); 215 #endif 216 if (_cursesi_screen->endwin) 217 return OK; 218 219 /* Get the current terminal state (which the user may have changed). */ 220 (void) tcgetattr(fileno(_cursesi_screen->infd), 221 &_cursesi_screen->save_termios); 222 223 __restore_stophandler(); 224 __restore_winchhandler(); 225 226 if (curscr != NULL) { 227 __unsetattr(0); 228 __mvcur((int) curscr->cury, (int) curscr->curx, 229 (int) curscr->maxy - 1, 0, 0); 230 } 231 232 if (__tc_mo != NULL) 233 (void) tputs(__tc_mo, 0, __cputchar); 234 235 if ((curscr != NULL) && (curscr->flags & __KEYPAD)) 236 (void) tputs(__tc_ke, 0, __cputchar); 237 (void) tputs(__tc_ve, 0, __cputchar); 238 (void) tputs(__tc_te, 0, __cputchar); 239 (void) fflush(_cursesi_screen->outfd); 240 (void) setvbuf(_cursesi_screen->outfd, NULL, _IOLBF, (size_t) 0); 241 242 _cursesi_screen->endwin = 1; 243 244 return (tcsetattr(fileno(_cursesi_screen->infd), 245 __tcaction ? TCSASOFT | TCSADRAIN : TCSADRAIN, 246 &_cursesi_screen->orig_termios) ? ERR : OK); 247 } 248 249 250 void 251 __restartwin(void) 252 { 253 struct winsize win; 254 255 #ifdef DEBUG 256 __CTRACE("__restartwin\n"); 257 #endif 258 if (!_cursesi_screen->endwin) 259 return; 260 261 /* Reset the curses SIGTSTP and SIGWINCH signal handlers. */ 262 __set_stophandler(); 263 __set_winchhandler(); 264 265 /* 266 * Check to see if the window size has changed. 267 * If the application didn't update LINES and COLS, 268 * set the * resized flag to tell getch() to push KEY_RESIZE. 269 * Update curscr, stdscr and __virtscr to match the new size. 270 */ 271 if (ioctl(fileno(_cursesi_screen->outfd), TIOCGWINSZ, &win) != -1 && 272 win.ws_row != 0 && win.ws_col != 0) { 273 if (win.ws_row != LINES) { 274 LINES = win.ws_row; 275 _cursesi_screen->resized = 1; 276 } 277 if (win.ws_col != COLS) { 278 COLS = win.ws_col; 279 _cursesi_screen->resized = 1; 280 } 281 } 282 if (curscr->maxy != LINES || curscr->maxx != COLS) 283 wresize(curscr, LINES, COLS); 284 if (stdscr->maxy != LINES || stdscr->maxx != COLS) 285 wresize(stdscr, LINES, COLS); 286 if (__virtscr->maxy != LINES || __virtscr->maxx != COLS) 287 wresize(__virtscr, LINES, COLS); 288 289 /* save the new "default" terminal state */ 290 (void) tcgetattr(fileno(_cursesi_screen->infd), 291 &_cursesi_screen->orig_termios); 292 293 /* Reset the terminal state to the mode just before we stopped. */ 294 (void) tcsetattr(fileno(_cursesi_screen->infd), 295 __tcaction ? TCSASOFT | TCSADRAIN : TCSADRAIN, 296 &_cursesi_screen->save_termios); 297 298 /* Restore colours */ 299 __restore_colors(); 300 301 /* Reset meta */ 302 __restore_meta_state(); 303 304 /* Restart the screen. */ 305 __startwin(_cursesi_screen); 306 307 /* Reset cursor visibility */ 308 __restore_cursor_vis(); 309 310 /* Repaint the screen. */ 311 wrefresh(curscr); 312 } 313 314 int 315 def_prog_mode(void) 316 { 317 if (_cursesi_screen->endwin) 318 return ERR; 319 320 return (tcgetattr(fileno(_cursesi_screen->infd), 321 &_cursesi_screen->save_termios) ? ERR : OK); 322 } 323 324 int 325 reset_prog_mode(void) 326 { 327 328 return tcsetattr(fileno(_cursesi_screen->infd), 329 __tcaction ? TCSASOFT | TCSADRAIN : TCSADRAIN, 330 &_cursesi_screen->save_termios) ? ERR : OK; 331 } 332 333 int 334 def_shell_mode(void) 335 { 336 return (tcgetattr(fileno(_cursesi_screen->infd), 337 &_cursesi_screen->orig_termios) ? ERR : OK); 338 } 339 340 int 341 reset_shell_mode(void) 342 { 343 return (__stopwin()); 344 } 345