Merge "crash_dump: make output fd O_APPEND." am: a70f1133

    return false;

  }

  // Make the fd O_APPEND so that our output is guaranteed to be at the end of a file.

  // (This also makes selinux rules consistent, because selinux distinguishes between writing to

  // a regular fd, and writing to an fd with O_APPEND).

  int flags = fcntl(tmp_output_fd.get(), F_GETFL);

  if (fcntl(tmp_output_fd.get(), F_SETFL, flags | O_APPEND) != 0) {

    PLOG(WARNING) << "failed to set output fd flags";

  }

  *tombstoned_socket = std::move(sockfd);

  *output_fd = std::move(tmp_output_fd);

  return true;