Ah, the joys of socket programming. You've caused a deadlock situation. The <sock> makes that your program is waiting for input (it's going to suck up all the input until eof, which in this case means, the socket closing). But the other end is also waiting for input, and it's not going to talk until it sees something. Your program is only going to finish if the other ends break the deadlock because some timer goes off.

Abigail