33 lines · cpp
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-exception6//7//===----------------------------------------------------------------------===//8 9#include "src/termios/cfsetispeed.h"10 11#include "src/__support/common.h"12#include "src/__support/libc_errno.h"13#include "src/__support/macros/config.h"14 15#include <termios.h>16 17namespace LIBC_NAMESPACE_DECL {18 19LLVM_LIBC_FUNCTION(int, cfsetispeed, (struct termios * t, speed_t speed)) {20 constexpr speed_t NOT_SPEED_MASK = ~speed_t(CBAUD);21 // A speed value is valid only if it is equal to one of the B<NN+> values.22 if (t == nullptr || ((speed & NOT_SPEED_MASK) != 0)) {23 libc_errno = EINVAL;24 return -1;25 }26 27 t->c_cflag = (t->c_cflag & NOT_SPEED_MASK) | speed;28 t->c_ispeed = speed;29 return 0;30}31 32} // namespace LIBC_NAMESPACE_DECL33