| 1 | //===-- Linux implementation of cfsetispeed -------------------------------===// |
|---|---|
| 2 | // |
| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| 4 | // See https://llvm.org/LICENSE.txt for license information. |
| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| 6 | // |
| 7 | //===----------------------------------------------------------------------===// |
| 8 | |
| 9 | #include "src/termios/cfsetispeed.h" |
| 10 | |
| 11 | #include "src/__support/common.h" |
| 12 | #include "src/errno/libc_errno.h" |
| 13 | |
| 14 | #include <termios.h> |
| 15 | |
| 16 | namespace LIBC_NAMESPACE { |
| 17 | |
| 18 | LLVM_LIBC_FUNCTION(int, cfsetispeed, (struct termios * t, speed_t speed)) { |
| 19 | constexpr speed_t NOT_SPEED_MASK = ~speed_t(CBAUD); |
| 20 | // A speed value is valid only if it is equal to one of the B<NN+> values. |
| 21 | if (t == nullptr || ((speed & NOT_SPEED_MASK) != 0)) { |
| 22 | libc_errno = EINVAL; |
| 23 | return -1; |
| 24 | } |
| 25 | |
| 26 | t->c_cflag = (t->c_cflag & NOT_SPEED_MASK) | speed; |
| 27 | t->c_ispeed = speed; |
| 28 | return 0; |
| 29 | } |
| 30 | |
| 31 | } // namespace LIBC_NAMESPACE |
| 32 |