Function CreateAndOpenFdForTemporaryFile

src/butil/file_util_posix.cc:147–155

Creates and opens a temporary file in |directory|, returning the file descriptor. |path| is set to the temporary file path. This function does NOT unlink() the file.

// file descriptor. |path| is set to the temporary file path.
// This function does NOT unlink() the file.
int CreateAndOpenFdForTemporaryFile(FilePath directory, FilePath* path) {
  ThreadRestrictions::AssertIOAllowed();  // For call to mkstemp().
  *path = directory.Append(butil::TempFileName());
  const std::string& tmpdir_string = path->value();
  // this should be OK since mkstemp just replaces characters in place
  char* buffer = const_cast<char*>(tmpdir_string.c_str());

  return HANDLE_EINTR(mkstemp(buffer));
}

#if defined(OS_LINUX)
// Determine if /dev/shm files can be mapped and then mprotect'd PROT_EXEC.