1 /* Copyright (C) 1992, 1996, 1997 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Lesser General Public
6 License as published by the Free Software Foundation; either
7 version 2.1 of the License, or (at your option) any later version.
8
9 The GNU C Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Lesser General Public License for more details.
13
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library; if not, write to the Free
16 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
17 02111-1307 USA. */
18
19 /* Modified for newlib, May 27, 2002, by Jeff Johnston */
20
21 #include <errno.h>
22 #include <stddef.h>
23 #include <signal.h>
24 #include <termios.h>
25 #include <unistd.h>
26 #include <sys/ioctl.h>
27
28 /* Send zero bits on FD. */
29 int
tcsendbreak(fd,duration)30 tcsendbreak (fd, duration)
31 int fd;
32 int duration;
33 {
34 /* The break lasts 0.25 to 0.5 seconds if DURATION is zero,
35 and an implementation-defined period if DURATION is nonzero.
36 We define a positive DURATION to be number of milliseconds to break. */
37 if (duration <= 0)
38 return ioctl (fd, TCSBRK, 0);
39
40 /* ioctl can't send a break of any other duration for us.
41 This could be changed to use trickery (e.g. lower speed and
42 send a '\0') to send the break, but for now just return an error. */
43 errno = (EINVAL);
44 return -1;
45 }
46