Shuts down a socket connection in the manner indicated by HOW, which has the same interpretation as in the syscall of the same name.
shutdown($socket, 0); # I/we have stopped reading datashutdown($socket, 1); # I/we have stopped writing datashutdown($socket, 2); # I/we have stopped using this socketThis is useful with sockets when you want to tell the other side you're done writing but not done reading, or vice versa. It's also a more insistent form of close because it also disables the file descriptor in any forked copies in other processes.
Returns1 for success; on error, returnsundef if the first argument is not a valid filehandle, or returns0 and sets$! for any other failure.
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