libc/src/termios/linux/tcsendbreak.cpp

//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
///
/// \file
/// Linux implementation of tcsendbreak.
///
//===----------------------------------------------------------------------===//

#include "src/termios/tcsendbreak.h"

#include "src/__support/OSUtil/linux/syscall_wrappers/ioctl.h"
#include "src/__support/common.h"
#include "src/__support/libc_errno.h"
#include "src/__support/macros/config.h"

#include <asm/ioctls.h> // Safe to include without the risk of name pollution.

namespace LIBC_NAMESPACE_DECL {

LLVM_LIBC_FUNCTION(int, tcsendbreak, (int fd, int /* unused duration */)) {
  // POSIX leaves the behavior for non-zero duration implementation dependent.
  // Which means that the behavior can be the same as it is when duration is
  // zero. So, we just pass zero to the syscall.
  auto ret = linux_syscalls::ioctl(fd, TCSBRK, 0);
  if (!ret.has_value()) {
    libc_errno = ret.error();
    return -1;
  }
  return 0;
}

} // namespace LIBC_NAMESPACE_DECL