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b168057a | 1 | /* Copyright (C) 1991-2015 Free Software Foundation, Inc. |
df4ef2ab | 2 | This file is part of the GNU C Library. |
28f540f4 | 3 | |
df4ef2ab | 4 | The GNU C Library is free software; you can redistribute it and/or |
41bdb6e2 AJ |
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. | |
28f540f4 | 8 | |
df4ef2ab UD |
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 | |
41bdb6e2 | 12 | Lesser General Public License for more details. |
28f540f4 | 13 | |
41bdb6e2 | 14 | You should have received a copy of the GNU Lesser General Public |
59ba27a6 PE |
15 | License along with the GNU C Library; if not, see |
16 | <http://www.gnu.org/licenses/>. */ | |
28f540f4 | 17 | |
28f540f4 RM |
18 | #include <errno.h> |
19 | #include <stddef.h> | |
20 | #include <signal.h> | |
21 | #include <termios.h> | |
22 | #include <unistd.h> | |
23 | #include "bsdtty.h" | |
24 | #include <sys/file.h> | |
25 | #include <sys/time.h> | |
26 | #include <sys/types.h> | |
27 | ||
28 | /* Send zero bits on FD. */ | |
29 | int | |
bd2260a2 | 30 | tcsendbreak (int fd, int duration) |
28f540f4 RM |
31 | { |
32 | struct timeval delay; | |
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 microseconds to break. */ | |
37 | if (duration <= 0) | |
38 | duration = 400000; | |
39 | ||
40 | delay.tv_sec = 0; | |
41 | delay.tv_usec = duration; | |
42 | ||
43 | /* Starting sending break. */ | |
038ebe24 | 44 | if (__ioctl (fd, TIOCSBRK, (void *) NULL) < 0) |
28f540f4 RM |
45 | return -1; |
46 | ||
47 | /* Wait DURATION microseconds. */ | |
48 | (void) __select (0, (fd_set *) NULL, (fd_set *) NULL, (fd_set *) NULL, | |
49 | &delay); | |
50 | ||
51 | /* Turn off the break. */ | |
038ebe24 | 52 | return __ioctl (fd, TIOCCBRK, (void *) NULL); |
28f540f4 | 53 | } |