static void signal_handler_reboot(int32_t theSignal)
{
	int i;
	int sockfd;
	char log_str_buf[LOG_STR_BUF_LEN];
	signal(SIGPIPE, SIG_IGN);
	if (SIGKILL == theSignal || SIGTERM == theSignal) //we can know when system excute child thread is end
	{
		snprintf(log_str_buf, LOG_STR_BUF_LEN, "receive kill signal exit the server.");
		LOG_INFO(LOG_LEVEL_FATAL, log_str_buf);
		if (listen_fd != -1)
		{
			closesocket(listen_fd);
			listen_fd = -1;
		}
		exit_flag = 1;
		exit_accept_flag = 1;
		for (i = 0; i < MAX_EVENTS; i++)
		{
			sockfd = get_fd_by_event_index(i);
			if (sockfd != -1)
			{
				closesocket(sockfd);
			}
		}
#if CONNECT_TO_SQL_SUCCESS
	sql_pool_destroy();
#endif
	}
	else if (SIGPIPE == theSignal)
	{
		LOG_INFO(LOG_LEVEL_INFO, "SIGPIPE received.\n");
	}
}

//注册信号函数，程序接收到对应信号后，做相应的处理

	signal(SIGKILL, signal_handler_reboot); // register the signal
	signal(SIGTERM, signal_handler_reboot);
	signal(SIGPIPE, signal_handler_reboot);