1 /* Copyright (C) 1991-2024 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
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.
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.
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library; if not, see
16 <https://www.gnu.org/licenses/>. */
26 #include <sys/types.h>
28 /* Send zero bits on FD. */
30 tcsendbreak (int fd
, int duration
)
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 microseconds to break. */
41 delay
.tv_usec
= duration
;
43 /* Starting sending break. */
44 if (__ioctl (fd
, TIOCSBRK
, (void *) NULL
) < 0)
47 /* Wait DURATION microseconds. */
48 (void) __select (0, (fd_set
*) NULL
, (fd_set
*) NULL
, (fd_set
*) NULL
,
51 /* Turn off the break. */
52 return __ioctl (fd
, TIOCCBRK
, (void *) NULL
);