请教大神:LWIP中的tcp_pcb结构体主要是干嘛的

liuchang

如题:请教大牛能简明扼要的说明下这个结构体的主要作用,拜谢了

[mw_shl_code=c,true]struct tcp_pcb { /** common PCB members */ IP_PCB; /** protocol specific PCB members */ TCP_PCB_COMMON(struct tcp_pcb); /* ports are in host byte order */ u16_t remote_port; u8_t flags; #define TF_ACK_DELAY ((u8_t)0x01U) /* Delayed ACK. */ #define TF_ACK_NOW ((u8_t)0x02U) /* Immediate ACK. */ #define TF_INFR ((u8_t)0x04U) /* In fast recovery. */ #define TF_TIMESTAMP ((u8_t)0x08U) /* Timestamp option enabled */ #define TF_RXCLOSED ((u8_t)0x10U) /* rx closed by tcp_shutdown */ #define TF_FIN ((u8_t)0x20U) /* Connection was closed locally (FIN segment enqueued). */ #define TF_NODELAY ((u8_t)0x40U) /* Disable Nagle algorithm */ #define TF_NAGLEMEMERR ((u8_t)0x80U) /* nagle enabled, memerr, try to output to prevent delayed ACK to happen */ /* the rest of the fields are in host byte order as we have to do some math with them */ /* Timers */ u8_t polltmr, pollinterval; u8_t last_timer;[/mw_shl_code]

zuozhongkai

这个结构体就是用来描述和记录一个TCP链接的属性的。就和你的档案一样，你想要的某个TCP链接的信息可以在这个结构体 中找到。

zc123

pcb是protocol control block的缩写，协议控制块
也就是这个结构体包含tcp层需要处理或者配置的信息