tstp.c revision 1.31
1 /* $NetBSD: tstp.c,v 1.31 2004/03/22 18:57:10 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 1.31 2004/03/22 18:57:10 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 struct sigaction otsa, owsa; 52 53 /* 54 * stop_signal_handler -- 55 * Handle stop signals. 56 */ 57 void 58 __stop_signal_handler(/*ARGSUSED*/int signo) 59 { 60 sigset_t oset, set; 61 62 /* 63 * Block window change and timer signals. The latter is because 64 * applications use timers to decide when to repaint the screen. 65 */ 66 (void) sigemptyset(&set); 67 (void) sigaddset(&set, SIGALRM); 68 (void) sigaddset(&set, SIGWINCH); 69 (void) sigprocmask(SIG_BLOCK, &set, &oset); 70 71 /* 72 * End the window, which also resets the terminal state to the 73 * original modes. 74 */ 75 __stopwin(); 76 77 /* Unblock SIGTSTP. */ 78 (void) sigemptyset(&set); 79 (void) sigaddset(&set, SIGTSTP); 80 (void) sigprocmask(SIG_UNBLOCK, &set, NULL); 81 82 /* Stop ourselves. */ 83 (void) kill(0, SIGTSTP); 84 85 /* Time passes ... */ 86 87 /* restart things */ 88 __restartwin(); 89 90 /* Reset the signals. */ 91 (void) sigprocmask(SIG_SETMASK, &oset, NULL); 92 } 93 94 /* 95 * Set the TSTP handler. 96 */ 97 void 98 __set_stophandler(void) 99 { 100 struct sigaction sa; 101 sa.sa_handler = __stop_signal_handler; 102 sa.sa_flags = SA_RESTART; 103 sigemptyset(&sa.sa_mask); 104 sigaction(SIGTSTP, &sa, &otsa); 105 } 106 107 /* 108 * Restore the TSTP handler. 109 */ 110 void 111 __restore_stophandler(void) 112 { 113 sigaction(SIGTSTP, &otsa, NULL); 114 } 115 116 /* 117 * winch_signal_handler -- 118 * Handle winch signals by pushing KEY_RESIZE into the input stream. 119 */ 120 void 121 __winch_signal_handler(/*ARGSUSED*/int signo) 122 { 123 struct winsize win; 124 125 if (ioctl(fileno(_cursesi_screen->outfd), TIOCGWINSZ, &win) != -1 && 126 win.ws_row != 0 && win.ws_col != 0) { 127 LINES = win.ws_row; 128 COLS = win.ws_col; 129 } 130 /* 131 * If there was a previous handler, call that, 132 * otherwise tell getch() to send KEY_RESIZE. 133 */ 134 if (owsa.sa_handler != __winch_signal_handler) 135 owsa.sa_handler(signo); 136 else 137 _cursesi_screen->resized = 1; 138 } 139 140 /* 141 * Set the WINCH handler. 142 */ 143 void 144 __set_winchhandler(void) 145 { 146 struct sigaction sa; 147 sa.sa_handler = __winch_signal_handler; 148 sa.sa_flags = 0; 149 sigemptyset(&sa.sa_mask); 150 sigaction(SIGWINCH, &sa, &owsa); 151 } 152 153 /* 154 * Restore the TSTP handler. 155 */ 156 void 157 __restore_winchhandler(void) 158 { 159 sigaction(SIGTSTP, &owsa, NULL); 160 } 161 162 /* To allow both SIGTSTP and endwin() to come back nicely, we provide 163 the following routines. */ 164 165 int 166 __stopwin(void) 167 { 168 if (_cursesi_screen->endwin) 169 return OK; 170 171 /* Get the current terminal state (which the user may have changed). */ 172 (void) tcgetattr(fileno(_cursesi_screen->infd), 173 &_cursesi_screen->save_termios); 174 175 __restore_stophandler(); 176 __restore_winchhandler(); 177 178 if (curscr != NULL) { 179 __unsetattr(0); 180 __mvcur((int) curscr->cury, (int) curscr->curx, (int) curscr->maxy - 1, 0, 0); 181 } 182 183 if (__tc_mo != NULL) 184 (void) tputs(__tc_mo, 0, __cputchar); 185 186 if ((curscr != NULL) && (curscr->flags & __KEYPAD)) 187 (void) tputs(__tc_ke, 0, __cputchar); 188 (void) tputs(__tc_ve, 0, __cputchar); 189 (void) tputs(__tc_te, 0, __cputchar); 190 (void) fflush(_cursesi_screen->outfd); 191 (void) setvbuf(_cursesi_screen->outfd, NULL, _IOLBF, (size_t) 0); 192 193 _cursesi_screen->endwin = 1; 194 195 return (tcsetattr(fileno(_cursesi_screen->infd), 196 __tcaction ? TCSASOFT | TCSADRAIN : TCSADRAIN, 197 &_cursesi_screen->orig_termios) ? ERR : OK); 198 } 199 200 201 void 202 __restartwin(void) 203 { 204 struct winsize win; 205 206 if (!_cursesi_screen->endwin) 207 return; 208 209 /* Reset the curses SIGTSTP and SIGWINCH signal handlers. */ 210 __set_stophandler(); 211 __set_winchhandler(); 212 213 /* Check to see if the window size has changed */ 214 if (ioctl(fileno(_cursesi_screen->outfd), TIOCGWINSZ, &win) != -1 && 215 win.ws_row != 0 && win.ws_col != 0) { 216 if (win.ws_row != LINES) { 217 LINES = win.ws_row; 218 _cursesi_screen->resized = 1; 219 } 220 if (win.ws_col != COLS) { 221 COLS = win.ws_col; 222 _cursesi_screen->resized = 1; 223 } 224 } 225 226 /* save the new "default" terminal state */ 227 (void) tcgetattr(fileno(_cursesi_screen->infd), 228 &_cursesi_screen->orig_termios); 229 230 /* Reset the terminal state to the mode just before we stopped. */ 231 (void) tcsetattr(fileno(_cursesi_screen->infd), 232 __tcaction ? TCSASOFT | TCSADRAIN : TCSADRAIN, 233 &_cursesi_screen->save_termios); 234 235 /* Restore colours */ 236 __restore_colors(); 237 238 /* Reset meta */ 239 __restore_meta_state(); 240 241 /* Restart the screen. */ 242 __startwin(_cursesi_screen); 243 244 /* Reset cursor visibility */ 245 __restore_cursor_vis(); 246 247 /* Repaint the screen. */ 248 wrefresh(curscr); 249 } 250 251 int 252 def_prog_mode(void) 253 { 254 if (_cursesi_screen->endwin) 255 return ERR; 256 257 return (tcgetattr(fileno(_cursesi_screen->infd), 258 &_cursesi_screen->save_termios) ? ERR : OK); 259 } 260 261 int 262 reset_prog_mode(void) 263 { 264 265 return tcsetattr(fileno(_cursesi_screen->infd), 266 __tcaction ? TCSASOFT | TCSADRAIN : TCSADRAIN, 267 &_cursesi_screen->save_termios) ? ERR : OK; 268 } 269 270 int 271 def_shell_mode(void) 272 { 273 return (tcgetattr(fileno(_cursesi_screen->infd), 274 &_cursesi_screen->orig_termios) ? ERR : OK); 275 } 276 277 int 278 reset_shell_mode(void) 279 { 280 return (__stopwin()); 281 } 282
Indexes created Tue Sep 23 07:09:52 GMT 2025