1 /****************************************************************************
2 * Copyright (c) 2016,2017 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, *
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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 1.5 2017/10/07 20:55:57 tom Exp $")
41 static TTY original_settings;
42 static bool can_restore = FALSE;
45 failed(const char *msg)
49 (void) fprintf(stderr, "%s: %s: %s\n", _nc_progname, msg, strerror(code));
50 restore_tty_settings();
51 (void) fprintf(stderr, "\n");
52 ExitProgram(ErrSystem(code));
57 get_tty_settings(int fd, TTY * tty_settings)
61 if (fd < 0 || GET_TTY(my_fd, tty_settings) < 0) {
68 * Open a file descriptor on the current terminal, to obtain its settings.
69 * stderr is less likely to be redirected than stdout; try that first.
72 save_tty_settings(TTY * tty_settings, bool need_tty)
74 if (!get_tty_settings(STDERR_FILENO, tty_settings) &&
75 !get_tty_settings(STDOUT_FILENO, tty_settings) &&
76 !get_tty_settings(STDIN_FILENO, tty_settings) &&
77 !get_tty_settings(open("/dev/tty", O_RDWR), tty_settings)) {
79 failed("terminal attributes");
81 my_fd = fileno(stdout);
85 original_settings = *tty_settings;
91 restore_tty_settings(void)
94 SET_TTY(my_fd, &original_settings);
97 /* Set the modes if they've changed. */
99 update_tty_settings(TTY * old_settings, TTY * new_settings)
101 if (memcmp(new_settings, old_settings, sizeof(TTY))) {
102 SET_TTY(my_fd, new_settings);