WhyCan Forum(哇酷开发者社区)

#if (LWIP_TCP_KEEPALIVE == 0)
#error "LWIP_TCP_KEEPALIVE must enable"
#endif

rt_err_t socket_config(void)
{
    int keepalive = 1;      //Enable keepalive.
    int keepidle = 60;      //idle time is 60s.
    int keepinterval = 5;   //sending interval of detective packet
    int keepcount = 3;      //detective count.
	
    int flag = 1;

    if (setsockopt(socket_fd, SOL_SOCKET, SO_KEEPALIVE, (void *)&keepalive, sizeof(keepalive)) < 0)
    {
        LOG("set Keep-Alive attribute failed\n");
        return -RT_ERROR;
    }
    setsockopt(socket_fd, IPPROTO_TCP, TCP_KEEPIDLE, (void*)&keepidle , sizeof(keepidle));
    setsockopt(socket_fd, IPPROTO_TCP, TCP_KEEPINTVL, (void *)&keepinterval , sizeof(keepinterval));
    setsockopt(socket_fd, IPPROTO_TCP, TCP_KEEPCNT, (void *)&keepcount , sizeof(keepcount));
	
    setsockopt(socket_fd, IPPROTO_TCP, TCP_NODELAY, (void *)&flag , sizeof(flag));

    return RT_EOK;
}

{
	struct timeval timeout;

	timeout.tv_sec = 1;
	timeout.tv_usec = 0;

	setsockopt(connected, SOL_SOCKET, SO_RCVTIMEO, &timeout, sizeof(timeout));			
}