tcsendbreak.c revision 1.5 
1/*-
2 * Copyright (c) 1989, 1993
3 *	The Regents of the University of California.  All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 * 3. Neither the name of the University nor the names of its contributors
14 *    may be used to endorse or promote products derived from this software
15 *    without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30#if defined(LIBC_SCCS) && !defined(lint)
31static char rcsid[] = "$OpenBSD: tcsendbreak.c,v 1.5 2003/06/11 21:03:09 deraadt Exp $";
32#endif /* LIBC_SCCS and not lint */
33
34#include <sys/types.h>
35#include <sys/ioctl.h>
36#include <sys/tty.h>
37#include <sys/time.h>
38#include <sys/fcntl.h>
39
40#include <errno.h>
41#include <stdio.h>
42#include <termios.h>
43#include <unistd.h>
44
45/* ARGSUSED */
46int
47tcsendbreak(int fd, int len)
48{
49	struct timeval sleepytime;
50
51	sleepytime.tv_sec = 0;
52	sleepytime.tv_usec = 400000;
53	if (ioctl(fd, TIOCSBRK, 0) == -1)
54		return (-1);
55	(void)select(0, 0, 0, 0, &sleepytime);
56	if (ioctl(fd, TIOCCBRK, 0) == -1)
57		return (-1);
58	return (0);
59}
60