go語(yǔ)言如何判斷tcp是否斷開(kāi)

go語(yǔ)言如何判斷tcp是否斷開(kāi)？針對(duì)這個(gè)問(wèn)題，這篇文章給出了相對(duì)應(yīng)的分析和解答，希望能幫助更多想解決這個(gè)問(wèn)題的朋友找到更加簡(jiǎn)單易行的辦法。

keepalive檢測(cè)，對(duì)于設(shè)置了keepalive來(lái)說(shuō)，當(dāng)tcp檢測(cè)到對(duì)端socket不再可用時(shí)(不能發(fā)出探測(cè)包,或探測(cè)包沒(méi)有收到ACK的響應(yīng)包),select會(huì)返回socket可讀,并且在recv時(shí)返回-1,同時(shí)置上errno為ETIMEDOUT。此時(shí)TCP的狀態(tài)是斷開(kāi)的。

struct TCP_KEEPALIVE {  
    unsigned long onoff;  
    unsigned long keepalivetime;  
    unsigned long keepaliveinterval;  
} ;  
  
#define SIO_KEEPALIVE_VALS _WSAIOW(IOC_VENDOR,4)  
  
/* KeepAlive實(shí)現(xiàn) */  
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?yún)?shù) */  
    struct TCP_KEEPALIVE inKeepAlive = {0};   
    unsigned long ulInLen = sizeof(struct TCP_KEEPALIVE);  
  
    /* 輸出參數(shù) */  
    struct TCP_KEEPALIVE outKeepAlive = {0};   
    unsigned long ulOutLen = sizeof(struct TCP_KEEPALIVE);  
    unsigned long ulBytesReturn = 0;  
    int ret = 0;  
  
    /* 設(shè)置keepalive 為5秒，并且發(fā)送次數(shù)為3次 */  
    inKeepAlive.onoff             = 1;  
    /* 2次keepalive探測(cè)間隔時(shí)間 */  
    inKeepAlive.keepaliveinterval = 5000;   
    /* 開(kāi)始首次keepalive探測(cè)前的tcp空閑時(shí)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());  
    }  
}

看完這篇文章，你們學(xué)會(huì)go語(yǔ)言判斷tcp是否斷開(kāi)的方法了嗎？如果還想學(xué)到更多技能或想了解更多相關(guān)內(nèi)容，歡迎關(guān)注億速云行業(yè)資訊頻道，感謝各位的閱讀。