1 /* $FreeBSD$ */
2 /* $OpenBSD: tty.c,v 1.3 2015/09/05 09:49:24 jsg Exp $ */
3
4 /*
5 * Copyright (c) 2013, Otto Moerbeek <[email protected]>
6 *
7 * Permission to use, copy, modify, and distribute this software for any
8 * purpose with or without fee is hereby granted, provided that the above
9 * copyright notice and this permission notice appear in all copies.
10 *
11 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
12 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
13 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
14 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
15 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
16 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
17 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
18 */
19
20 #include <errno.h>
21 #include <signal.h>
22 #include <histedit.h>
23 #include <termios.h>
24 #include "extern.h"
25
26 struct termios ttysaved, ttyedit;
27
28 static int
settty(struct termios * t)29 settty(struct termios *t)
30 {
31 int ret;
32
33 while ((ret = tcsetattr(0, TCSADRAIN, t)) == -1 && errno == EINTR)
34 continue;
35 return ret;
36 }
37
38 int
gettty(struct termios * t)39 gettty(struct termios *t)
40 {
41 int ret;
42
43 while ((ret = tcgetattr(0, t)) == -1 && errno == EINTR)
44 continue;
45 return ret;
46 }
47
48 /* ARGSUSED */
49 void
tstpcont(int sig)50 tstpcont(int sig)
51 {
52 int save_errno = errno;
53
54 if (sig == SIGTSTP) {
55 signal(SIGCONT, tstpcont);
56 gettty(&ttyedit);
57 settty(&ttysaved);
58 } else {
59 signal(SIGTSTP, tstpcont);
60 settty(&ttyedit);
61 }
62 signal(sig, SIG_DFL);
63 kill(0, sig);
64 errno = save_errno;
65 }
66