1 /* $OpenBSD: tty.c,v 1.5 2023/03/08 04:43:10 guenther Exp $ */
2
3 /*
4 * Copyright (c) 2013, Otto Moerbeek <otto@drijf.net>
5 *
6 * Permission to use, copy, modify, and distribute this software for any
7 * purpose with or without fee is hereby granted, provided that the above
8 * copyright notice and this permission notice appear in all copies.
9 *
10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17 */
18
19 #include <errno.h>
20 #include <signal.h>
21 #include <histedit.h>
22 #include <termios.h>
23 #include "extern.h"
24
25 struct termios ttysaved, ttyedit;
26
27 static int
settty(struct termios * t)28 settty(struct termios *t)
29 {
30 int ret;
31
32 while ((ret = tcsetattr(0, TCSADRAIN, t)) == -1 && errno == EINTR)
33 continue;
34 return ret;
35 }
36
37 int
gettty(struct termios * t)38 gettty(struct termios *t)
39 {
40 int ret;
41
42 while ((ret = tcgetattr(0, t)) == -1 && errno == EINTR)
43 continue;
44 return ret;
45 }
46
47 void
tstpcont(int sig)48 tstpcont(int sig)
49 {
50 int save_errno = errno;
51
52 if (sig == SIGTSTP) {
53 signal(SIGCONT, tstpcont);
54 gettty(&ttyedit);
55 settty(&ttysaved);
56 } else {
57 signal(SIGTSTP, tstpcont);
58 settty(&ttyedit);
59 }
60 signal(sig, SIG_DFL);
61 kill(0, sig);
62 errno = save_errno;
63 }
64