1 /****************************************************************************
2 * Copyright 2020 Thomas E. Dickey *
3 * Copyright 2016,2017 Free Software Foundation, Inc. *
5 * Permission is hereby granted, free of charge, to any person obtaining a *
6 * copy of this software and associated documentation files (the *
7 * "Software"), to deal in the Software without restriction, including *
8 * without limitation the rights to use, copy, modify, merge, publish, *
9 * distribute, distribute with modifications, sublicense, and/or sell *
10 * copies of the Software, and to permit persons to whom the Software is *
11 * furnished to do so, subject to the following conditions: *
13 * The above copyright notice and this permission notice shall be included *
14 * in all copies or substantial portions of the Software. *
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS *
17 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF *
18 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. *
19 * IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, *
20 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR *
21 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR *
22 * THE USE OR OTHER DEALINGS IN THE SOFTWARE. *
24 * Except as contained in this notice, the name(s) of the above copyright *
25 * holders shall not be used in advertising or otherwise to promote the *
26 * sale, use or other dealings in this Software without prior written *
28 ****************************************************************************/
30 /****************************************************************************
31 * Author: Thomas E. Dickey *
32 ****************************************************************************/
35 #include <tty_settings.h>
39 MODULE_ID("$Id: tty_settings.c,v 1.6 2020/02/02 23:34:34 tom Exp $")
42 static TTY original_settings;
43 static bool can_restore = FALSE;
46 failed(const char *msg)
50 (void) fprintf(stderr, "%s: %s: %s\n", _nc_progname, msg, strerror(code));
51 restore_tty_settings();
52 (void) fprintf(stderr, "\n");
53 ExitProgram(ErrSystem(code));
58 get_tty_settings(int fd, TTY * tty_settings)
62 if (fd < 0 || GET_TTY(my_fd, tty_settings) < 0) {
69 * Open a file descriptor on the current terminal, to obtain its settings.
70 * stderr is less likely to be redirected than stdout; try that first.
73 save_tty_settings(TTY * tty_settings, bool need_tty)
75 if (!get_tty_settings(STDERR_FILENO, tty_settings) &&
76 !get_tty_settings(STDOUT_FILENO, tty_settings) &&
77 !get_tty_settings(STDIN_FILENO, tty_settings) &&
78 !get_tty_settings(open("/dev/tty", O_RDWR), tty_settings)) {
80 failed("terminal attributes");
82 my_fd = fileno(stdout);
86 original_settings = *tty_settings;
92 restore_tty_settings(void)
95 SET_TTY(my_fd, &original_settings);
98 /* Set the modes if they've changed. */
100 update_tty_settings(TTY * old_settings, TTY * new_settings)
102 if (memcmp(new_settings, old_settings, sizeof(TTY))) {
103 SET_TTY(my_fd, new_settings);