question: private int processPollFds ( ) throws IOException { if ( pollFds . get ( 0 ) . revents == POLLIN ) { byte [ ] buffer = new byte [ 8 ] ; while ( IoBridge . read ( wakeupIn , buffer , 0 , 1 ) > 0 ) { } } int readyKeyCount = 0 ; for ( int i = 1 ; i < pollFds . size ( ) ; ++ i ) { StructPollfd pollFd = pollFds . get ( i ) ; if ( pollFd . revents == 0 ) { continue ; } if ( pollFd . fd == null ) { break ; } SelectionKeyImpl key = ( SelectionKeyImpl ) pollFd . userData ; pollFd . fd = null ; pollFd . userData = null ; int ops = key . interestOpsNoCheck ( ) ; int selectedOps = 0 ; if ( ( pollFd . revents & POLLHUP ) != 0 ) { selectedOps |= ops ; } if ( ( pollFd . revents & POLLIN ) != 0 ) { selectedOps |= ops & ( OP_ACCEPT | OP_READ ) ; } if ( ( pollFd . revents & POLLOUT ) != 0 ) { if ( key . isConnected ( ) ) { selectedOps |= ops & OP_WRITE ; } else { selectedOps |= ops & OP_CONNECT ; } } if ( selectedOps != 0 ) { boolean wasSelected = mutableSelectedKeys . contains ( key ) ; if ( wasSelected && key . readyOps ( ) != selectedOps ) { key . setReadyOps ( key . readyOps ( ) | selectedOps ) ; ++ readyKeyCount ; } else if ( ! wasSelected ) { key . setReadyOps ( selectedOps ) ; mutableSelectedKeys . add ( key ) ; ++ readyKeyCount ; } } } return readyKeyCount ; }
target:  Updates the key ready ops and selected key set.