select() on UDP does not guarantee recvfrom() won't block

I've always thought that if I select on a blocking UDP socket that I can assume that a read subsequent read will not block. Apparently that is not the case. select on linux can in fact lie, it is only a hint. They suggest that O_NONBLOCK should be used with select. I'm linking the _long_ thread if anyone is interested. This is not a new development, but it is new to me. Has this been discussed on the list? The reason I am asking is that I've recently come across a problem where my 1.1 freeradius deamon is blocking on recvfrom on port 1814. Do you guys consider it fundamentally wrong to select on blocking UDP sockets? Thanks, Ryan http://www.gossamer-threads.com/lists/engine?do=post_view_flat;post=479100;p...