go語言如何判斷tcp是否斷開

go語言如何判斷tcp是否斷開？針對這個問題，這篇文章給出了相對應的分析和解答，希望能幫助更多想解決這個問題的朋友找到更加簡單易行的辦法。

keepalive檢測，對于設置了keepalive來說，當tcp檢測到對端socket不再可用時(不能發出探測包,或探測包沒有收到ACK的響應包),select會返回socket可讀,并且在recv時返回-1,同時置上errno為ETIMEDOUT。此時TCP的狀態是斷開的。

struct TCP_KEEPALIVE {  
    unsigned long onoff;  
    unsigned long keepalivetime;  
    unsigned long keepaliveinterval;  
} ;  
  
#define SIO_KEEPALIVE_VALS _WSAIOW(IOC_VENDOR,4)  
  
/* KeepAlive實現 */  
void set_keepalive (SOCKET s)  
{  
    BOOL bKeepAlive = TRUE;  
    int nRet = ::setsockopt(s, SOL_SOCKET, SO_KEEPALIVE, (char*)&bKeepAlive, sizeof(bKeepAlive));  
    if (nRet == SOCKET_ERROR)  
    {  
        return ;  
    }  
    /* 輸入參數 */  
    struct TCP_KEEPALIVE inKeepAlive = {0};   
    unsigned long ulInLen = sizeof(struct TCP_KEEPALIVE);  
  
    /* 輸出參數 */  
    struct TCP_KEEPALIVE outKeepAlive = {0};   
    unsigned long ulOutLen = sizeof(struct TCP_KEEPALIVE);  
    unsigned long ulBytesReturn = 0;  
    int ret = 0;  
  
    /* 設置keepalive 為5秒，并且發送次數為3次 */  
    inKeepAlive.onoff             = 1;  
    /* 2次keepalive探測間隔時間 */  
    inKeepAlive.keepaliveinterval = 5000;   
    /* 開始首次keepalive探測前的tcp空閑時間 */  
    inKeepAlive.keepalivetime     = 5000;   
  
    ret = WSAIoctl((unsigned int)s,  
            SIO_KEEPALIVE_VALS,  
            (LPVOID)&inKeepAlive,   
            ulInLen,  
            (LPVOID)&outKeepAlive,   
            ulOutLen,  
            &ulBytesReturn,   
            NULL,   
            NULL);  
    if (ret == SOCKET_ERROR)  
    {  
        printf ("error: %d\n", WSAGetLastError());  
    }  
}

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