1 /* $NetBSD: tstp.c,v 1.44 2018/10/18 07:53:13 roy 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 1.44 2018/10/18 07:53:13 roy Exp $"); 38 #endif 39 #endif /* not lint */ 40 41 #include <sys/ioctl.h> 42 #include <sys/param.h> 43 44 #include <errno.h> 45 #include <signal.h> 46 #include <termios.h> 47 #include <unistd.h> 48 49 #include "curses.h" 50 #include "curses_private.h" 51 52 static int tstp_set; 53 static int winch_set; 54 55 static void (*otstpfn)(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 { 109 110 #ifdef DEBUG 111 __CTRACE(__CTRACE_MISC, "__set_stophandler: %d\n", tstp_set); 112 #endif 113 if (!tstp_set) { 114 otstpfn = signal(SIGTSTP, __stop_signal_handler); 115 tstp_set = 1; 116 } 117 } 118 119 /* 120 * Restore the TSTP handler. 121 */ 122 void 123 __restore_stophandler(void) 124 { 125 126 #ifdef DEBUG 127 __CTRACE(__CTRACE_MISC, "__restore_stophandler: %d\n", tstp_set); 128 #endif 129 if (tstp_set) { 130 (void)signal(SIGTSTP, otstpfn); 131 tstp_set = 0; 132 } 133 } 134 135 /* 136 * winch_signal_handler -- 137 * Handle winch signals by pushing KEY_RESIZE into the input stream. 138 */ 139 void 140 __winch_signal_handler(/*ARGSUSED*/int signo) 141 { 142 struct winsize win; 143 144 if (ioctl(fileno(_cursesi_screen->outfd), TIOCGWINSZ, &win) != -1 && 145 win.ws_row != 0 && win.ws_col != 0) 146 { 147 LINES = win.ws_row; 148 COLS = win.ws_col; 149 } 150 /* 151 * If there was a previous handler, call that, 152 * otherwise tell getch() to send KEY_RESIZE. 153 */ 154 if (owsa.sa_handler != SIG_DFL && 155 owsa.sa_handler != SIG_IGN && 156 owsa.sa_handler != SIG_ERR && 157 owsa.sa_handler != SIG_HOLD) 158 owsa.sa_handler(signo); 159 else 160 _cursesi_screen->resized = 1; 161 } 162 163 /* 164 * Set the WINCH handler. 165 */ 166 void 167 __set_winchhandler(void) 168 { 169 170 #ifdef DEBUG 171 __CTRACE(__CTRACE_MISC, "__set_winchhandler: %d\n", winch_set); 172 #endif 173 if (!winch_set) { 174 struct sigaction sa; 175 176 sa.sa_handler = __winch_signal_handler; 177 sa.sa_flags = 0; 178 sigemptyset(&sa.sa_mask); 179 sigaction(SIGWINCH, &sa, &owsa); 180 winch_set = 1; 181 #ifdef DEBUG 182 __CTRACE(__CTRACE_MISC, 183 "__set_winchhandler: owsa.sa_handler=%p\n", 184 owsa.sa_handler); 185 #endif 186 } 187 } 188 189 /* 190 * Restore the WINCH handler. 191 */ 192 void 193 __restore_winchhandler(void) 194 { 195 196 #ifdef DEBUG 197 __CTRACE(__CTRACE_MISC, "__restore_winchhandler: %d\n", winch_set); 198 #endif 199 if (winch_set > 0) { 200 struct sigaction cwsa; 201 202 sigaction(SIGWINCH, NULL, &cwsa); 203 if (cwsa.sa_handler == owsa.sa_handler) { 204 sigaction(SIGWINCH, &owsa, NULL); 205 winch_set = 0; 206 } else { 207 /* 208 * We're now using the programs WINCH handler, 209 * so don't restore the previous one. 210 */ 211 winch_set = -1; 212 #ifdef DEBUG 213 __CTRACE(__CTRACE_MISC, "cwsa.sa_handler = %p\n", 214 cwsa.sa_handler); 215 #endif 216 } 217 } 218 } 219 220 /* To allow both SIGTSTP and endwin() to come back nicely, we provide 221 the following routines. */ 222 223 int 224 __stopwin(void) 225 { 226 227 #ifdef DEBUG 228 __CTRACE(__CTRACE_MISC, "__stopwin\n"); 229 #endif 230 if (_cursesi_screen == NULL) 231 return ERR; 232 if (_cursesi_screen->endwin) 233 return OK; 234 235 /* Get the current terminal state (which the user may have changed). */ 236 (void)tcgetattr(fileno(_cursesi_screen->infd), 237 &_cursesi_screen->save_termios); 238 239 __restore_stophandler(); 240 __restore_winchhandler(); 241 242 if (curscr != NULL) { 243 __unsetattr(0); 244 __mvcur((int)curscr->cury, (int)curscr->curx, 245 (int)curscr->maxy - 1, 0, 0); 246 } 247 248 if (meta_on != NULL) 249 (void)tputs(meta_on, 0, __cputchar); 250 251 if ((curscr != NULL) && (curscr->flags & __KEYPAD)) 252 (void)tputs(keypad_local, 0, __cputchar); 253 (void)tputs(cursor_normal, 0, __cputchar); 254 (void)tputs(exit_ca_mode, 0, __cputchar); 255 (void)fflush(_cursesi_screen->outfd); 256 #ifdef BSD 257 (void)setvbuf(_cursesi_screen->outfd, NULL, _IOLBF, 0); 258 #endif 259 260 _cursesi_screen->endwin = 1; 261 262 return tcsetattr(fileno(_cursesi_screen->infd), TCSASOFT | TCSADRAIN, 263 &_cursesi_screen->orig_termios) ? ERR : OK; 264 } 265 266 void 267 __restartwin(void) 268 { 269 struct winsize win; 270 int nlines, ncols; 271 272 #ifdef DEBUG 273 __CTRACE(__CTRACE_MISC, "__restartwin\n"); 274 #endif 275 if (!_cursesi_screen->endwin) 276 return; 277 278 /* Reset the curses SIGTSTP and SIGWINCH signal handlers. */ 279 __set_stophandler(); 280 __set_winchhandler(); 281 282 /* 283 * Check to see if the window size has changed. 284 * If the application didn't update LINES and COLS, 285 * set the * resized flag to tell getch() to push KEY_RESIZE. 286 * Update curscr (which also updates __virtscr) and stdscr 287 * to match the new size. 288 */ 289 if (ioctl(fileno(_cursesi_screen->outfd), TIOCGWINSZ, &win) != -1 && 290 win.ws_row != 0 && win.ws_col != 0) 291 { 292 if (win.ws_row != LINES) { 293 LINES = win.ws_row; 294 _cursesi_screen->resized = 1; 295 } 296 if (win.ws_col != COLS) { 297 COLS = win.ws_col; 298 _cursesi_screen->resized = 1; 299 } 300 } 301 /* 302 * We need to make local copies of LINES and COLS, otherwise we 303 * could lose if they are changed between wresize() calls. 304 */ 305 nlines = LINES; 306 ncols = COLS; 307 if (curscr->maxy != nlines || curscr->maxx != ncols) 308 wresize(curscr, nlines, ncols); 309 if (stdscr->maxy != nlines || stdscr->maxx != ncols) 310 wresize(stdscr, nlines, ncols); 311 312 /* save the new "default" terminal state */ 313 (void)tcgetattr(fileno(_cursesi_screen->infd), 314 &_cursesi_screen->orig_termios); 315 316 /* Reset the terminal state to the mode just before we stopped. */ 317 (void)tcsetattr(fileno(_cursesi_screen->infd), TCSASOFT | TCSADRAIN, 318 &_cursesi_screen->save_termios); 319 320 /* Restore colours */ 321 __restore_colors(); 322 323 /* Reset meta */ 324 __restore_meta_state(); 325 326 /* Restart the screen. */ 327 __startwin(_cursesi_screen); 328 329 /* Reset cursor visibility */ 330 __restore_cursor_vis(); 331 332 /* Repaint the screen. */ 333 wrefresh(curscr); 334 } 335 336 int 337 def_prog_mode(void) 338 { 339 340 if (_cursesi_screen->endwin) 341 return ERR; 342 343 return tcgetattr(fileno(_cursesi_screen->infd), 344 &_cursesi_screen->save_termios) ? ERR : OK; 345 } 346 347 int 348 reset_prog_mode(void) 349 { 350 351 return tcsetattr(fileno(_cursesi_screen->infd), TCSASOFT | TCSADRAIN, 352 &_cursesi_screen->save_termios) ? ERR : OK; 353 } 354 355 int 356 def_shell_mode(void) 357 { 358 359 return tcgetattr(fileno(_cursesi_screen->infd), 360 &_cursesi_screen->orig_termios) ? ERR : OK; 361 } 362 363 int 364 reset_shell_mode(void) 365 { 366 367 return __stopwin(); 368 } 369