TCP Connection timeout 구현 관련

다음 코드는 TCP에 timeout을 걸어주기 위해 구성한 코드인데요,

문제는 꺼져있는 호스트에 접근할 때, 제생각엔 select에서 걸려 timeout이 발생해야 할 것 같은데,

쭉 끝까지 내려가면서 Operation now in progress란 error code를 뱉어내네요

문제점이 무엇이고, 어떻게 해결하면 좋을까요. 혹 제가 잘못 알고 있는건가요?

궁금합니다.

다음은 코드입니다.

P.S. KLDP가 리모델링 되면서 적응을 못하고 있는데요, 코드삽입할때 어떻게 넣어야 하는지요. 쭉 늘어놓으면 보기힘들어서..
P.S.2 검색은 어디서 하나요? 오른쪽 상단에 찾기는 구글 search이던데.. 예전처럼 전체 검색, 혹은 게시판별 검색이 가능한가요? 방법은??

Int32 CNetworkClient::TCPConnect(string strHostName, Int32 nPort, Int32 nTimeoutSec)

{

//Domain Name resolution
string strIPAddress;
if(NameResolution(strHostName, strIPAddress) != NWC_OK){
DBG_E_PRINT("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);

DBGPRINT("CNetworkClient::TCPConnect-->Try to Connect host:%s\n",strHostName.c_str());

saveFlags = fcntl(socketFD, F_GETFL, 0);
if(saveFlags<0)
{
DBG_E_PRINT("CNetworkClient::TCPConnect-->fcntl()1 error\n");
return NWC_TCP_CONNECTION_ERROR;
}
//Set Non Blocking
if(fcntl(socketFD, F_SETFL, saveFlags | O_NONBLOCK)<0)
{
DBG_E_PRINT("CNetworkClient::TCPConnect-->fcntl()2 error\n");
return NWC_TCP_CONNECTION_ERROR;
}
err=connect(socketFD, (struct sockaddr*)&sockAddr, sizeof(sockAddr));
back_err = errno;
DBG_E_PRINT("CNetworkClient::TCPConnect-->%s \n", strerror(errno));

//resotre flags
if(fcntl(socketFD, F_SETFL, saveFlags)<0)
{
DBG_E_PRINT("CNetworkClient::TCPConnect-->fcntl()3 error\n");
return NWC_TCP_CONNECTION_ERROR;
}

/* return unless the connection was successful or the connect is
still in progress. */
if(err<0 && back_err!=EINPROGRESS)
{
DBG_E_PRINT("CNetworkClient::TCPConnect-->connect() error\n");
return NWC_TCP_CONNECTION_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<0)
{
DBG_E_PRINT("CNetworkClient::TCPConnect-->select() error\n");
return NWC_TCP_CONNECTION_ERROR;
}

/* 0 means it timeout out & no fds changed */
if(err==0)
{
DBGPRINT("CNetworkClient::TCPConnect-->Timeout Occurred\n");
m_tNWCState = NWC_STATE_ERROR_TIMEOUT;
return NWC_TCP_CONNECTION_TIME_OUT;
}

// Get the return code from the connect
socklen_t len=sizeof(ret);
err=getsockopt(socketFD, SOL_SOCKET, SO_ERROR, &ret, &len);
if(err<0)
{
DBG_E_PRINT("CNetworkClient::TCPConnect-->getsockopt() error\n");
return NWC_TCP_CONNECTION_ERROR;
}

// ret=0 means success, otherwise it contains the errno
if(ret)
{
err=ret;
DBG_E_PRINT("CNetworkClient::TCPConnect-->%s \n", strerror(errno));
return NWC_TCP_CONNECTION_ERROR;
}

if(m_nTCPSocketFD !=-1){
// cout<<"Socket:"< close(m_nTCPSocketFD);
}

m_nTCPSocketFD = socketFD;
// cout<<"Port:"< return NWC_OK;

}

{

//Domain Name resolution
string strIPAddress;
if(NameResolution(strHostName, strIPAddress) != NWC_OK){
DBG_E_PRINT("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);

DBGPRINT("CNetworkClient::TCPConnect-->Try to Connect host:%s\n",strHostName.c_str());

saveFlags = fcntl(socketFD, F_GETFL, 0);
if(saveFlags<0)
{
DBG_E_PRINT("CNetworkClient::TCPConnect-->fcntl()1 error\n");
return NWC_TCP_CONNECTION_ERROR;
}
//Set Non Blocking
if(fcntl(socketFD, F_SETFL, saveFlags | O_NONBLOCK)<0)
{
DBG_E_PRINT("CNetworkClient::TCPConnect-->fcntl()2 error\n");
return NWC_TCP_CONNECTION_ERROR;
}
err=connect(socketFD, (struct sockaddr*)&sockAddr, sizeof(sockAddr));
back_err = errno;
DBG_E_PRINT("CNetworkClient::TCPConnect-->%s \n", strerror(errno));

//resotre flags
if(fcntl(socketFD, F_SETFL, saveFlags)<0)
{
DBG_E_PRINT("CNetworkClient::TCPConnect-->fcntl()3 error\n");
return NWC_TCP_CONNECTION_ERROR;
}

/* return unless the connection was successful or the connect is
still in progress. */
if(err<0 && back_err!=EINPROGRESS)
{
DBG_E_PRINT("CNetworkClient::TCPConnect-->connect() error\n");
return NWC_TCP_CONNECTION_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<0)
{
DBG_E_PRINT("CNetworkClient::TCPConnect-->select() error\n");
return NWC_TCP_CONNECTION_ERROR;
}

/* 0 means it timeout out & no fds changed */
if(err==0)
{
DBGPRINT("CNetworkClient::TCPConnect-->Timeout Occurred\n");
m_tNWCState = NWC_STATE_ERROR_TIMEOUT;
return NWC_TCP_CONNECTION_TIME_OUT;
}

// Get the return code from the connect
socklen_t len=sizeof(ret);
err=getsockopt(socketFD, SOL_SOCKET, SO_ERROR, &ret, &len);
if(err<0)
{
DBG_E_PRINT("CNetworkClient::TCPConnect-->getsockopt() error\n");
return NWC_TCP_CONNECTION_ERROR;
}

// ret=0 means success, otherwise it contains the errno
if(ret)
{
err=ret;
DBG_E_PRINT("CNetworkClient::TCPConnect-->%s \n", strerror(errno));
return NWC_TCP_CONNECTION_ERROR;
}

if(m_nTCPSocketFD !=-1){
// cout<<"Socket:"< close(m_nTCPSocketFD);
}

m_nTCPSocketFD = socketFD;
// cout<<"Port:"< return NWC_OK;

}