This function does the same thing as the
listen(2) system call. It tells the system that
you're going to be accepting connections on this socket and that the system can
queue the number of waiting connections specified by
QUEUESIZE. Imagine having call-waiting on your
phone, with up to five callers queued. (Gives me the willies!) The function
returns true if it succeeded, false otherwise (and puts the error code into
$!). See the section "Sockets" in Chapter 6.