Method open

sql/log.cc:4564–4578

bool Event_log::open(enum cache_type io_cache_type_arg)
{
  bool error= init_io_cache(&log_file, -1, LOG_BIN_IO_SIZE, io_cache_type_arg,
                            0, 0, MYF(MY_WME | MY_NABP | MY_WAIT_IF_FULL));

  log_state= LOG_OPENED;
  inited= true;
  if (error)
    return error;

  longlong bytes_written= write_description_event(BINLOG_CHECKSUM_ALG_OFF,
                                                  false, true, false);
  status_var_add(current_thd->status_var.binlog_bytes_written, bytes_written);
  return bytes_written < 0;
}

longlong
Event_log::write_description_event(enum_binlog_checksum_alg checksum_alg,