open.hpp

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// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//  http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

#ifndef __STOUT_OS_OPEN_HPP__
#define __STOUT_OS_OPEN_HPP__

#include <sys/stat.h>
#include <sys/types.h>

#include <string>

#include <stout/error.hpp>
#include <stout/nothing.hpp>
#include <stout/try.hpp>

#include <stout/os/close.hpp>
#include <stout/os/fcntl.hpp>
#include <stout/os/int_fd.hpp>

#ifdef __WINDOWS__
#include <stout/internal/windows/longpath.hpp>
#endif // __WINDOWS__

#ifndef O_CLOEXEC
#error "missing O_CLOEXEC support on this platform"
#endif

namespace os {

inline Try<int_fd> open(const std::string& path, int oflag, mode_t mode = 0)
{
#ifdef __WINDOWS__
  std::wstring longpath = ::internal::windows::longpath(path);
  // By default, Windows will perform "text translation" meaning that it will
  // automatically write CR/LF instead of LF line feeds. To prevent this, and
  // use the POSIX semantics, we open with `O_BINARY`.
  int_fd fd = ::_wopen(longpath.data(), oflag | O_BINARY, mode);
#else
  int_fd fd = ::open(path.c_str(), oflag, mode);
#endif // __WINDOWS__
  if (fd < 0) {
    return ErrnoError();
  }

  return fd;
}

} // namespace os {

#endif // __STOUT_OS_OPEN_HPP__