1/*      $OpenBSD: tty.c,v 1.3 2015/09/05 09:49:24 jsg 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
25struct termios ttysaved, ttyedit;
26
27static int
28settty(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
37int
38gettty(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/* ARGSUSED */
48void
49tstpcont(int sig)
50{
51	int save_errno = errno;
52
53	if (sig == SIGTSTP) {
54		signal(SIGCONT, tstpcont);
55		gettty(&ttyedit);
56		settty(&ttysaved);
57	} else {
58		signal(SIGTSTP, tstpcont);
59		settty(&ttyedit);
60	}
61	signal(sig, SIG_DFL);
62	kill(0, sig);
63	errno = save_errno;
64}
65