int dmtcp::CkptSerializer::openMtcpCheckpointFile(const dmtcp::string& path){
  int fd = openDmtcpCheckpointFile(path);
  jalib::JBinarySerializeReaderRaw rdr(path, fd);
  static ConnectionToFds cfd;
  static ProcessInfo pInfo;
  cfd.serialize(rdr);
  pInfo.serialize(rdr);
  return fd;
}