1 /****************************************************************************
2 * Copyright (c) 2016 Free Software Foundation, Inc. *
4 * Permission is hereby granted, free of charge, to any person obtaining a *
5 * copy of this software and associated documentation files (the *
6 * "Software"), to deal in the Software without restriction, including *
7 * without limitation the rights to use, copy, modify, merge, publish, *
8 * distribute, distribute with modifications, sublicense, and/or sell *
9 * copies of the Software, and to permit persons to whom the Software is *
10 * furnished to do so, subject to the following conditions: *
12 * The above copyright notice and this permission notice shall be included *
13 * in all copies or substantial portions of the Software. *
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS *
16 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF *
17 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. *
18 * IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, *
19 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR *
20 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR *
21 * THE USE OR OTHER DEALINGS IN THE SOFTWARE. *
23 * Except as contained in this notice, the name(s) of the above copyright *
24 * holders shall not be used in advertising or otherwise to promote the *
25 * sale, use or other dealings in this Software without prior written *
27 ****************************************************************************/
29 /****************************************************************************
30 * Author: Thomas E. Dickey *
31 ****************************************************************************/
34 #include <tty_settings.h>
38 MODULE_ID("$Id: tty_settings.c,v 1.2 2016/12/24 19:31:11 tom Exp $")
41 static TTY original_settings;
42 static bool can_restore = FALSE;
47 restore_tty_settings();
48 (void) fprintf(stderr, "\n");
49 ExitProgram(EXIT_FAILURE);
54 failed(const char *msg)
58 _nc_STRCPY(temp, _nc_progname, sizeof(temp));
59 _nc_STRCAT(temp, ": ", sizeof(temp));
60 _nc_STRNCAT(temp, msg, sizeof(temp), sizeof(temp) - strlen(temp) - 2);
67 get_tty_settings(int fd, TTY * tty_settings)
71 if (fd < 0 || GET_TTY(my_fd, tty_settings) < 0) {
78 * Open a file descriptor on the current terminal, to obtain its settings.
79 * stderr is less likely to be redirected than stdout; try that first.
82 save_tty_settings(TTY * tty_settings)
84 if (!get_tty_settings(STDERR_FILENO, tty_settings) &&
85 !get_tty_settings(STDOUT_FILENO, tty_settings) &&
86 !get_tty_settings(STDIN_FILENO, tty_settings) &&
87 !get_tty_settings(open("/dev/tty", O_RDWR), tty_settings)) {
88 failed("terminal attributes");
91 original_settings = *tty_settings;
96 restore_tty_settings(void)
99 SET_TTY(my_fd, &original_settings);
102 /* Set the modes if they've changed. */
104 update_tty_settings(TTY * old_settings, TTY * new_settings)
106 if (memcmp(new_settings, old_settings, sizeof(TTY))) {
107 SET_TTY(my_fd, new_settings);