Hi,
I'm making a sort of 'query' tool for game servers, to get some information etc. It works pretty well, except when you fill in an hostname which doesn't exists, it keeps hanging at the recvfrom() call. My GUI blocks and than I must kill the app.
UDP Sockets are unconnected, so I can't find a way to check if the given hostname is online. Does somebody knows it?
Perhaps use select() with a timeout to observe the socket in question before attempting a recv() on it?
If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
If at first you don't succeed, try writing your phone number on the exam paper.
Yay, got it working now
This is my function:
Code:/** * Checks if the socket is ready for reading */ bool Socket::can_read() { int r= 0; fd_set rset; struct timeval tv; FD_ZERO(&rset); FD_SET(this -> socket, &rset); tv.tv_sec= this -> timeout; tv.tv_usec= 0; do { r = select(this -> socket + 1, &rset, NULL, NULL, &tv); } while(r == -1 && errno == EINTR); return (r > 0); }
