1/*	$NetBSD: tcflow.c,v 1.8 2003/08/07 16:44:13 agc Exp $	*/
2
3/*-
4 * Copyright (c) 1989, 1993
5 *	The Regents of the University of California.  All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 *    may be used to endorse or promote products derived from this software
17 *    without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32#include <sys/cdefs.h>
33#if defined(LIBC_SCCS) && !defined(lint)
34#if 0
35static char sccsid[] = "@(#)termios.c	8.2 (Berkeley) 2/21/94";
36#else
37__RCSID("$NetBSD: tcflow.c,v 1.8 2003/08/07 16:44:13 agc Exp $");
38#endif
39#endif /* LIBC_SCCS and not lint */
40
41#include "namespace.h"
42#include <sys/ioctl.h>
43
44#include <assert.h>
45#include <errno.h>
46#include <termios.h>
47#include <unistd.h>
48
49#ifdef __weak_alias
50__weak_alias(tcflow,_tcflow)
51#endif
52
53int
54tcflow(int fd, int action)
55{
56	struct termios term;
57	u_char c;
58
59	_DIAGASSERT(fd != -1);
60
61	switch (action) {
62	case TCOOFF:
63		return (ioctl(fd, TIOCSTOP, 0));
64	case TCOON:
65		return (ioctl(fd, TIOCSTART, 0));
66	case TCION:
67	case TCIOFF:
68		if (tcgetattr(fd, &term) == -1)
69			return (-1);
70		c = term.c_cc[action == TCIOFF ? VSTOP : VSTART];
71		if (c != _POSIX_VDISABLE && write(fd, &c, sizeof(c)) == -1)
72			return (-1);
73		return (0);
74	default:
75		errno = EINVAL;
76		return (-1);
77	}
78	/* NOTREACHED */
79}
80