Operation now in progress 이란 message에 대한 대처

Timeout이 지원되는 TCP Connection을 구현해 보았습니다.

그런데 Error가발생하여 찍어보니, "Operation now in progress" 라고 나오네요.

어떻게 대처해야 하는지요. 또 왜 이런 메시지가 나오는지 궁금합니다.

코드 첨부합니다.
아래 코드중 getsockopt부분에서 ret값이 0보다 커서 cout

살펴봐주세요.

P.S. 코드를 삽입할때 다른방법이 있는 것 같은데, 몰라서 그냥 쭉 긁어넣습니다. 죄송합니다.

int32 TCPConnect(string strHostName, int32 nPort, int32 nTimeoutSec)
{
// DebugMessage("CNetworkClient::TCPConnect-->");
// DebugMessage((char*)strHostName.c_str());
// DebugMessage("\n");

//Domain Name resolution
string strIPAddress;
if(NameResolution(strHostName, strIPAddress) != NWC_OK){
DebugMessage("CNetworkClient::TCPConnect-->NameResolution fail\n");
return NWC_TCP_CONNECTION_ERROR;
}

//TCP Connect
int32 socketFD;
int32 err;
int32 saveFlags,ret,back_err;
fd_set fd_w;
struct timeval timeout;
struct sockaddr_in sockAddr;

/*connects to server
*/

socketFD = socket(AF_INET, SOCK_STREAM,0);

memset(&sockAddr,'\0', sizeof(sockAddr));

sockAddr.sin_family = AF_INET;
sockAddr.sin_port = htons(nPort);
sockAddr.sin_addr.s_addr = inet_addr(strIPAddress.c_str());
// inet_pton(AF_INET, strIpAddress, &sockAddr.sin_addr);

DebugMessage("CNetworkClient::TCPConnect-->Try to Connect host~");
DebugMessage((char*)strHostName.c_str());DebugMessage("\n");

saveFlags = fcntl(socketFD, F_GETFL, 0);
if(saveFlags {
DebugMessage("CNetworkClient::TCPConnect-->fcntl()1 error\n");
return NWC_ERROR;
}
//Set Non Blocking
if(fcntl(socketFD, F_SETFL, saveFlags | O_NONBLOCK) {
DebugMessage("CNetworkClient::TCPConnect-->fcntl()2 error\n");
return NWC_ERROR;
}
err=connect(socketFD, (struct sockaddr*)&sockAddr, sizeof(sockAddr));
back_err = errno;
//resotre flags
if(fcntl(socketFD, F_SETFL, saveFlags) {
DebugMessage("CNetworkClient::TCPConnect-->fcntl()3 error\n");
return NWC_ERROR;
}

/* return unless the connection was successful or the connect is
still in progress. */
if(err {
DebugMessage("CNetworkClient::TCPConnect-->connect() error\n");
return NWC_ERROR;
}

timeout.tv_sec = (long)nTimeoutSec;
timeout.tv_usec = 0L;

FD_ZERO(&fd_w);
FD_SET(socketFD,&fd_w);

err=select(FD_SETSIZE,NULL,&fd_w,NULL,&timeout);
if(err {
DebugMessage("CNetworkClient::TCPConnect-->select() error\n");
return NWC_ERROR;
}

/* 0 means it timeout out & no fds changed */
if(err==0)
{
DebugMessage("CNetworkClient::TCPConnect-->Timeout Occured\n");
return NWC_ERROR;
}

// Get the return code from the connect
socklen_t len=sizeof(ret);
err=getsockopt(socketFD,SOL_SOCKET,SO_ERROR,&ret,&len);
if(err {
DebugMessage("CNetworkClient::TCPConnect-->getsockopt() error\n");
return NWC_ERROR;
}

// ret=0 means success, otherwise it contains the errno
if(ret)
{
err=ret;
cout return NWC_ERROR;
}

if(m_nTCPSocketFD !=-1){
// cout close(m_nTCPSocketFD);
}

m_nTCPSocketFD = socketFD;
// cout return NWC_OK;

}