take for instance the following code snippet, the creation of the socket, listening and acceptance of a new socket works fine. The non-blocking mode is also working, however the pselect (or even replacing with select) is not recognizing any IO requests ready on the FDset. so the return value is always 0 (timed out).
I was wondering if I need to set anything else further before going into pselect() so that it recognizes the IO activity.
.....
// Create the socket
*m_pSockFD = socket(AF_INET, SOCK_STREAM, 0);
if( *this->m_pSockFD == -1 ){
throw ....
}
// Set the socket address information
m_pSockAddr->sin_family = AF_INET;
m_pSockAddr->sin_port = htons( 6001 );
m_pSockAddr->sin_addr.s_addr = INADDR_ANY;
if( bind(*m_pSockFD, (struct sockaddr *) m_pSockAddr, sizeof(*m_pSockAddr) ) != 0 ){
.....
}
// Listen on this socket using a block queue of 5 - default Block Size
if( listen( *m_pSockFD, 5) != 0 )
........
// change function control to non blocking file descritor for I/O operations
long fcntlArg;
if( (fcntlArg = fcntl( *m_pSockFD, F_GETFL, NULL ) ) < 0 ){
...........
}
fcntlArg |= O_NONBLOCK;
if( fcntl( *m_pSockFD, F_SETFL, fcntlArg ) <0 ){
...........
}
//.........
int newFD = -1;
socklen_t salen = sizeof(*m_pSockAddr);
// loop selecting for a I/O operation ready on the file descriptor then go into accept mode
struct timespec timeOut;
timeOut.tv_sec = 1;
timeOut.tv_nsec = 0;
fd_set fdset;
FD_SET( *this->m_pSockFD, &fdset );
while( !m_bShutDownFinished ){
// TODO pselect is not registering the activity on the socket
if( pselect( *this->m_pSockFD, &fdset, NULL , NULL , &timeOut, NULL ) > 0 ){
cout << "hello client" << endl;
break;
}
// re-initialize the time struct
timeOut.tv_sec = 1;
timeOut.tv_nsec = 0;
}
// application is shutting down do not try to accept a new socket
if( m_bShutDownFinished ) return -1;
newFD = accept(*m_pSockFD, (struct sockaddr *) m_pSockAddr, &salen);
if( newFD > -1 ){
................
}
return newFD;