1 /* $NetBSD: tstp.c,v 1.40 2013/10/15 13:00:52 christos 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 1.40 2013/10/15 13:00:52 christos 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 #ifndef TCSASOFT 59 #define TCSASOFT 0 60 #endif 61 62 /* 63 * stop_signal_handler -- 64 * Handle stop signals. 65 */ 66 void 67 __stop_signal_handler(/*ARGSUSED*/int signo) 68 { 69 sigset_t oset, set; 70 71 /* 72 * Block window change and timer signals. The latter is because 73 * applications use timers to decide when to repaint the screen. 74 */ 75 (void) sigemptyset(&set); 76 (void) sigaddset(&set, SIGALRM); 77 (void) sigaddset(&set, SIGWINCH); 78 (void) sigprocmask(SIG_BLOCK, &set, &oset); 79 80 /* 81 * End the window, which also resets the terminal state to the 82 * original modes. 83 */ 84 __stopwin(); 85 86 /* Unblock SIGTSTP. */ 87 (void) sigemptyset(&set); 88 (void) sigaddset(&set, SIGTSTP); 89 (void) sigprocmask(SIG_UNBLOCK, &set, NULL); 90 91 /* Stop ourselves. */ 92 (void) kill(0, SIGTSTP); 93 94 /* Time passes ... */ 95 96 /* restart things */ 97 __restartwin(); 98 99 /* Reset the signals. */ 100 (void) sigprocmask(SIG_SETMASK, &oset, NULL); 101 } 102 103 /* 104 * Set the TSTP handler. 105 */ 106 void 107 __set_stophandler(void) 108 { 109 #ifdef DEBUG 110 __CTRACE(__CTRACE_MISC, "__set_stophandler: %d\n", tstp_set); 111 #endif 112 if (!tstp_set) { 113 otstpfn = signal(SIGTSTP, __stop_signal_handler); 114 tstp_set = 1; 115 } 116 } 117 118 /* 119 * Restore the TSTP handler. 120 */ 121 void 122 __restore_stophandler(void) 123 { 124 #ifdef DEBUG 125 __CTRACE(__CTRACE_MISC, "__restore_stophandler: %d\n", tstp_set); 126 #endif 127 if (tstp_set) { 128 (void) signal(SIGTSTP, otstpfn); 129 tstp_set = 0; 130 } 131 } 132 133 /* 134 * winch_signal_handler -- 135 * Handle winch signals by pushing KEY_RESIZE into the input stream. 136 */ 137 void 138 __winch_signal_handler(/*ARGSUSED*/int signo) 139 { 140 struct winsize win; 141 142 if (ioctl(fileno(_cursesi_screen->outfd), TIOCGWINSZ, &win) != -1 && 143 win.ws_row != 0 && win.ws_col != 0) { 144 LINES = win.ws_row; 145 COLS = win.ws_col; 146 } 147 /* 148 * If there was a previous handler, call that, 149 * otherwise tell getch() to send KEY_RESIZE. 150 */ 151 if (owsa.sa_handler != NULL) 152 owsa.sa_handler(signo); 153 else 154 _cursesi_screen->resized = 1; 155 } 156 157 /* 158 * Set the WINCH handler. 159 */ 160 void 161 __set_winchhandler(void) 162 { 163 #ifdef DEBUG 164 __CTRACE(__CTRACE_MISC, "__set_winchhandler: %d\n", winch_set); 165 #endif 166 if (!winch_set) { 167 struct sigaction sa; 168 169 sa.sa_handler = __winch_signal_handler; 170 sa.sa_flags = 0; 171 sigemptyset(&sa.sa_mask); 172 sigaction(SIGWINCH, &sa, &owsa); 173 winch_set = 1; 174 #ifdef DEBUG 175 __CTRACE(__CTRACE_MISC, 176 "__set_winchhandler: owsa.sa_handler=%p\n", 177 owsa.sa_handler); 178 #endif 179 } 180 } 181 182 /* 183 * Restore the WINCH handler. 184 */ 185 void 186 __restore_winchhandler(void) 187 { 188 #ifdef DEBUG 189 __CTRACE(__CTRACE_MISC, "__restore_winchhandler: %d\n", winch_set); 190 #endif 191 if (winch_set > 0) { 192 struct sigaction cwsa; 193 194 sigaction(SIGWINCH, NULL, &cwsa); 195 if (cwsa.sa_handler == owsa.sa_handler) { 196 sigaction(SIGWINCH, &owsa, NULL); 197 winch_set = 0; 198 } else { 199 /* 200 * We're now using the programs WINCH handler, 201 * so don't restore the previous one. 202 */ 203 winch_set = -1; 204 #ifdef DEBUG 205 __CTRACE(__CTRACE_MISC, "cwsa.sa_handler = %p\n", 206 cwsa.sa_handler); 207 #endif 208 } 209 } 210 } 211 212 /* To allow both SIGTSTP and endwin() to come back nicely, we provide 213 the following routines. */ 214 215 int 216 __stopwin(void) 217 { 218 #ifdef DEBUG 219 __CTRACE(__CTRACE_MISC, "__stopwin\n"); 220 #endif 221 if (_cursesi_screen->endwin) 222 return OK; 223 224 /* Get the current terminal state (which the user may have changed). */ 225 (void) tcgetattr(fileno(_cursesi_screen->infd), 226 &_cursesi_screen->save_termios); 227 228 __restore_stophandler(); 229 __restore_winchhandler(); 230 231 if (curscr != NULL) { 232 __unsetattr(0); 233 __mvcur((int) curscr->cury, (int) curscr->curx, 234 (int) curscr->maxy - 1, 0, 0); 235 } 236 237 if (meta_on != NULL) 238 (void) tputs(meta_on, 0, __cputchar); 239 240 if ((curscr != NULL) && (curscr->flags & __KEYPAD)) 241 (void) tputs(keypad_local, 0, __cputchar); 242 (void) tputs(cursor_normal, 0, __cputchar); 243 (void) tputs(exit_ca_mode, 0, __cputchar); 244 (void) fflush(_cursesi_screen->outfd); 245 (void) setvbuf(_cursesi_screen->outfd, NULL, _IOLBF, (size_t) 0); 246 247 _cursesi_screen->endwin = 1; 248 249 return tcsetattr(fileno(_cursesi_screen->infd), TCSASOFT | TCSADRAIN, 250 &_cursesi_screen->orig_termios) ? ERR : OK; 251 } 252 253 254 void 255 __restartwin(void) 256 { 257 struct winsize win; 258 int nlines, ncols; 259 260 #ifdef DEBUG 261 __CTRACE(__CTRACE_MISC, "__restartwin\n"); 262 #endif 263 if (!_cursesi_screen->endwin) 264 return; 265 266 /* Reset the curses SIGTSTP and SIGWINCH signal handlers. */ 267 __set_stophandler(); 268 __set_winchhandler(); 269 270 /* 271 * Check to see if the window size has changed. 272 * If the application didn't update LINES and COLS, 273 * set the * resized flag to tell getch() to push KEY_RESIZE. 274 * Update curscr (which also updates __virtscr) and stdscr 275 * to match the new size. 276 */ 277 if (ioctl(fileno(_cursesi_screen->outfd), TIOCGWINSZ, &win) != -1 && 278 win.ws_row != 0 && win.ws_col != 0) { 279 if (win.ws_row != LINES) { 280 LINES = win.ws_row; 281 _cursesi_screen->resized = 1; 282 } 283 if (win.ws_col != COLS) { 284 COLS = win.ws_col; 285 _cursesi_screen->resized = 1; 286 } 287 } 288 /* 289 * We need to make local copies of LINES and COLS, otherwise we 290 * could lose if they are changed between wresize() calls. 291 */ 292 nlines = LINES; 293 ncols = COLS; 294 if (curscr->maxy != nlines || curscr->maxx != ncols) 295 wresize(curscr, nlines, ncols); 296 if (stdscr->maxy != nlines || stdscr->maxx != ncols) 297 wresize(stdscr, nlines, ncols); 298 299 /* save the new "default" terminal state */ 300 (void) tcgetattr(fileno(_cursesi_screen->infd), 301 &_cursesi_screen->orig_termios); 302 303 /* Reset the terminal state to the mode just before we stopped. */ 304 (void) tcsetattr(fileno(_cursesi_screen->infd), TCSASOFT | TCSADRAIN, 305 &_cursesi_screen->save_termios); 306 307 /* Restore colours */ 308 __restore_colors(); 309 310 /* Reset meta */ 311 __restore_meta_state(); 312 313 /* Restart the screen. */ 314 __startwin(_cursesi_screen); 315 316 /* Reset cursor visibility */ 317 __restore_cursor_vis(); 318 319 /* Repaint the screen. */ 320 wrefresh(curscr); 321 } 322 323 int 324 def_prog_mode(void) 325 { 326 if (_cursesi_screen->endwin) 327 return ERR; 328 329 return tcgetattr(fileno(_cursesi_screen->infd), 330 &_cursesi_screen->save_termios) ? ERR : OK; 331 } 332 333 int 334 reset_prog_mode(void) 335 { 336 337 return tcsetattr(fileno(_cursesi_screen->infd), TCSASOFT | TCSADRAIN, 338 &_cursesi_screen->save_termios) ? ERR : OK; 339 } 340 341 int 342 def_shell_mode(void) 343 { 344 return tcgetattr(fileno(_cursesi_screen->infd), 345 &_cursesi_screen->orig_termios) ? ERR : OK; 346 } 347 348 int 349 reset_shell_mode(void) 350 { 351 return __stopwin(); 352 } 353