tcsendbreak.c revision 1.3 
1/*	$NetBSD: tcsendbreak.c,v 1.3 1997/07/21 14:09:18 jtc 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. All advertising materials mentioning features or use of this software
16 *    must display the following acknowledgement:
17 *	This product includes software developed by the University of
18 *	California, Berkeley and its contributors.
19 * 4. Neither the name of the University nor the names of its contributors
20 *    may be used to endorse or promote products derived from this software
21 *    without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
34 */
35
36#include <sys/cdefs.h>
37#if defined(LIBC_SCCS) && !defined(lint)
38#if 0
39static char sccsid[] = "@(#)termios.c	8.2 (Berkeley) 2/21/94";
40#else
41__RCSID("$NetBSD: tcsendbreak.c,v 1.3 1997/07/21 14:09:18 jtc Exp $");
42#endif
43#endif /* LIBC_SCCS and not lint */
44
45#include "namespace.h"
46#include <sys/types.h>
47#include <sys/ioctl.h>
48#include <sys/tty.h>
49#include <sys/time.h>
50#include <sys/fcntl.h>
51
52#include <errno.h>
53#include <stdio.h>
54#include <termios.h>
55#include <unistd.h>
56
57#ifdef __weak_alias
58__weak_alias(tcsendbreak,_tcsendbreak);
59#endif
60
61int
62tcsendbreak(fd, len)
63	int fd, len;
64{
65	struct timeval sleepytime;
66
67	sleepytime.tv_sec = 0;
68	sleepytime.tv_usec = 400000;
69	if (ioctl(fd, TIOCSBRK, 0) == -1)
70		return (-1);
71	(void)select(0, 0, 0, 0, &sleepytime);
72	if (ioctl(fd, TIOCCBRK, 0) == -1)
73		return (-1);
74	return (0);
75}
76