There is a denial-of-service program called "octopus", and a variant
called "spider" (not to be confused with a web spider), whose sole purpose is
to consume all of the resources, usually file descriptors, of a target machine.
This patch would be a useful in preventing such a program from being
effective; it would also be useful on IRC servers for limiting clone bots.
In a word, YES, it would be very useful functionality.
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