LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: no active pcbs\n"));} while(pcb !=NULL) { if(pcb...
这样后面就会：因为tcp_slowtmr: no active pcbs 而导致：lwip_socket(PF_INET, SOCK_STREAM, 0) =...
若找到匹配的 LISTEN 状态控制块,则内核会新建一个 tcp_pcb 结构,并将 tcp_pcb_listen 结构中各个字段拷贝至其中,同时填写结构中的源端口号、源 IP 地址等字段,最后在 tcp_active_pcbs 链表中添加这个新 tcp_pcb 结构。这样,新 TCP 控制块就处在 tcp_active_pcbs 中了,此时这个 tcp_pcb 结构的 state 字段...
tcp_slowtmr: no active pcbs The last line is then outputed evermore. Does this happen to give insights to anyone? While having loopback would be nice down the road, my main interest in getting loopback working is as a stepping stone to using slip or ppp. ...
的链表,分别是tcp_active_pcbs【处于接受发送数据状态的pcbs】、 tcp_tw_pcbs【处于时间等待状态的pcbs】、tcp_listen_pcbs【处于 监听状态的pcbs】。 似乎tcp_bind 函数更有意思,它分别检查了4 个pcbs 链表,除 了上面的三个还有一个tcp_bound_pcbs
tcpip_lwip详解 应用层 telnet、ftp、smtp端口号 dhcp、snmp、dns、rtp端口号UDP 传输层 TCP 6报文分片报文组装网络层1.目的地址为本机，交给上层处理2.非本机，路由，转发3.非本机，非路由，丢弃0x0800IGMP2IP 17ICMP1路由器ping arp驱动程序链路层帧网卡0x0806 IP首部 4位版本 4位首部长度16位标识 8位TOS...
*/voidtcp_slowtmr(void){ TCP_PCB *pcb, *pcb2, *prev; uint16 eff_wnd; uint8 err= ERR_OK; ++tcp_ticks;/* Steps through all of the active PCBs. */prev =NULL; pcb = &stTcpPcb;if(pcb->state == SYN_SENT && pcb->nrtx == TCP_SYNMAXRTX) ...
/* Steps through all of the TIME-WAIT PCBs. */ prev = NULL; pcb = tcp_tw_pcbs; while (pcb != NULL) { LWIP_ASSERT("tcp_slowtmr: TIME-WAIT pcb->state == TIME-WAIT", pcb->state == TIME_WAIT); pcb_remove = 0; /* Check if this PCB has stayed long enough in TIME-WAIT *...
/* 处于已绑定状态的TCP PCB */structtcp_pcb*tcp_bound_pcbs;/* 处于监听状态的TCP PCB */uniontcp_listen_pcbs_ttcp_listen_pcbs;/* 处于稳定状态的TCP PCB */structtcp_pcb*tcp_active_pcbs;/* 处于TIME_WAIT状态的TCP PCB */structtcp_pcb*tcp_tw_pcbs; ...
tcp_active_pcbs链表用来连接处于 TCP 状态转换图中其他所有状态的控制块。 structtcp_pcb *tcp_bound_pcbs;//连接所有进行了端口号绑定,但是还没有发起连接(主动连接)或进入侦听状态(被动连接)的控制块union tcp_listen_pcbs_t tcp_listen_pcbs;//连接所有进入侦听状态(被动连接)的控制块structtcp_pcb *tcp...