mktemp.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_POSIX_MKTEMP_HPP__
#define __STOUT_OS_POSIX_MKTEMP_HPP__

#include <stdlib.h>
#include <string.h>

#include <string>

#include <stout/error.hpp>
#include <stout/path.hpp>
#include <stout/try.hpp>

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


namespace os {

// Creates a temporary file using the specified path template. The
// template may be any path with _6_ `Xs' appended to it, for example
// /tmp/temp.XXXXXX. The trailing `Xs' are replaced with a unique
// alphanumeric combination.
inline Try<std::string> mktemp(
    const std::string& path = path::join(os::temp(), "XXXXXX"))
{
  char* _path = new char[path.size() + 1];
  ::memcpy(_path, path.c_str(), path.size() + 1);

  int_fd fd = ::mkstemp(_path);
  std::string temp(_path);
  delete[] _path;

  if (fd < 0) {
    return ErrnoError();
  }

  Try<Nothing> close = os::close(fd);

  // We propagate `close` failures if creation of the temp file was successful.
  if (close.isError()) {
    return Error("Failed to close '" + stringify(fd) + "':" + close.error());
  }

  return temp;
}

} // namespace os {


#endif // __STOUT_OS_POSIX_MKTEMP_HPP__