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b7459e56 | 1 | /* Send break to terminal. |
6d7e8eda | 2 | Copyright (C) 1996-2023 Free Software Foundation, Inc. |
478b92f0 | 3 | This file is part of the GNU C Library. |
b7459e56 | 4 | |
478b92f0 | 5 | The GNU C Library is free software; you can redistribute it and/or |
41bdb6e2 AJ |
6 | modify it under the terms of the GNU Lesser General Public |
7 | License as published by the Free Software Foundation; either | |
8 | version 2.1 of the License, or (at your option) any later version. | |
b7459e56 | 9 | |
478b92f0 UD |
10 | The GNU C Library is distributed in the hope that it will be useful, |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
41bdb6e2 | 13 | Lesser General Public License for more details. |
b7459e56 | 14 | |
41bdb6e2 | 15 | You should have received a copy of the GNU Lesser General Public |
59ba27a6 | 16 | License along with the GNU C Library; if not, see |
5a82c748 | 17 | <https://www.gnu.org/licenses/>. */ |
b7459e56 RM |
18 | |
19 | #include <errno.h> | |
20 | #include <stddef.h> | |
21 | #include <termios.h> | |
22 | #include <sys/ioctl.h> | |
23 | ||
24 | /* Send zero bits on FD. */ | |
25 | int | |
26 | tcsendbreak (int fd, int duration) | |
27 | { | |
28 | /* The break lasts 0.25 to 0.5 seconds if DURATION is zero, | |
29 | and an implementation-defined period if DURATION is nonzero. | |
30 | We define a positive DURATION to be number of milliseconds to break. */ | |
31 | if (duration <= 0) | |
32 | return __ioctl (fd, TCSBRK, 0); | |
33 | ||
34 | #ifdef TCSBRKP | |
35 | /* Probably Linux-specific: a positive third TCSBRKP ioctl argument is | |
36 | defined to be the number of 100ms units to break. */ | |
37 | return __ioctl (fd, TCSBRKP, (duration + 99) / 100); | |
38 | #else | |
39 | /* ioctl can't send a break of any other duration for us. | |
40 | This could be changed to use trickery (e.g. lower speed and | |
41 | send a '\0') to send the break, but for now just return an error. */ | |
2caca60d | 42 | return INLINE_SYSCALL_ERROR_RETURN_VALUE (EINVAL); |
b7459e56 RM |
43 | #endif |
44 | } |