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POTCP nonblock connect failed with getsockopt OptValue 113 Please suggest
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copied!<p>I have created a sample TCP connect function. This uses non-blocking socket with timeout. The code is working fine in our lab but in some network TCP connect fails with error 115 which means EINPROGRESS. After debug found <code>getsockopt()</code> set the iValopt to 113 and we check <code>optvalue</code> is equal to zero, if not return failure.</p> <p>OS: LINUX Suse10 </p> <p>My questions are:</p> <ol> <li>Is the code pasted here right?</li> <li>Why <code>getsockopt()</code> Opt value is set to 113 and errno set to 115?</li> </ol> <p>Also I notice below.</p> <ul> <li>Client has multiple IP: 174.66.45.22, 58.68.445.112</li> <li>Server has multiple IP: 174.88.69.33, 58.46.22.33</li> <li>If I set Bind address to 174.66.45.22 and connect to 174.88.69.33 is always success.</li> <li>If I set Bind address to 174.66.45.22 and connect to 58.46.22.33 will fail. </li> <li>But if I just set Bind address to 58.68.445.112 in first run and in second run I change Bind address to 174.66.45.22 then connect to 58.46.22.33 is Success!</li> </ul> <p>Can you explain why?</p> <p>The exact code I have pasted here</p> <pre><code>int tcp_sockconnect_linux(int iSocket, const struct sockaddr* pstSockAddr, unsigned int uiSockAddrLen, unsigned int uiConnectionTimeout) { int iRet = 0; //int iValopt = 0; int iLength = 0; struct timeval stTv; fd_set write_fds; (void)fcntl((int)(long)iSocket, F_SETFL, O_NONBLOCK); iRet = connect((int)(long)iSocket, (struct sockaddr*) pstSockAddr, uiSockAddrLen); if (iRet < 0) { if (errno == EINPROGRESS) { stTv.tv_sec = uiConnectionTimeout; stTv.tv_usec = 0; FD_ZERO(&write_fds); FD_SET((int)(long)iSocket, &write_fds); if (0 < select(((int)(long)(iSocket)) + 1,NULL, &write_fds, NULL, &stTv)) { iLength = sizeof(int); if (0 > getsockopt((int)(long)iSocket, SOL_SOCKET,SO_ERROR, (void*)(&iValopt), &iLength)) { return -1; } if (0 != iValopt) { return -1; } return 2; } else { return -1; } } else { return -1; } } return 2; } int create_socket(void) { int iRet, sock_sd; struct sockaddr_in saServer; struct sockaddr_in saLocal; #ifdef WIN32 WSADATA wsaData; if(WSAStartup(0x101, &wsaData)) { printf("Unable to initialize WinSock library.\n"); } #endif memset (&saLocal,'\0', sizeof(saLocal)); saLocal.sin_family = AF_INET; saLocal.sin_addr.s_addr = inet_addr(strBindAddr); saLocal.sin_port = htons(0); sock_sd = socket(AF_INET,SOCK_STREAM,0); memset (&saServer,'\0', sizeof(saServer)); saServer.sin_family = AF_INET; saServer.sin_addr.s_addr = inet_addr (strServerIP); saServer.sin_port = htons(uiServerPort); iRet = bind((unsigned int)sock_sd,(struct sockaddr*) &saLocal,sizeof(saLocal)); #ifdef WIN32 if (iRet == SOCKET_ERROR) { printf("\nTCP Bind Failed to LocalIP %s\n",strBindAddr); } #else if (-1 == iRet) { printf("\nTCP Bind Failed to LocalIP %s\n",strBindAddr); } #endif #ifdef WIN32 iRet = tcp_sockconnect_win(sock_sd, (struct sockaddr*) &saServer,sizeof(saServer),uiConnectionTimeOut); if (iRet == SOCKET_ERROR) { printf("\nTCP Socket Connect Failed with ErrorNo = %d iValopt = %d LineNo = %d \n",WSAGetLastError(),iValopt,iLineNo); } else if (2 == iRet) { printf("\nTCP Socket Connect Success \n"); } #else iRet = tcp_sockconnect_linux(sock_sd, (struct sockaddr*) &saServer,sizeof(saServer),uiConnectionTimeOut); if(-1 == iRet) { printf("\nTCP Socket Connect Failed with ErrorNo = %d iValopt = %d LineNo = %d\n",errno,iValopt,iLineNo); } else if (2 == iRet) { printf("\nTCP Socket Connect Success %d\n",iLineNo); } #endif #ifdef WIN32 closesocket (sock_sd); #else close(sock_sd); #endif return 0; } int main () { int iRet = 0; printf ("Enter the Bind Address (Local IP): "); scanf("%s" ,&strBindAddr); printf ("\nEnter the IP Address of Server : "); scanf("%s" ,&strServerIP); printf ("\nEnter the PORT Number of Server : "); scanf("%d" ,&uiServerPort); printf ("\nEnter the Connection timeout in Seconds : "); scanf("%d", &uiConnectionTimeOut); iRet = create_socket(); return 0; } </code></pre>

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