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Use portend to monitor TCP ports for bound or unbound states.
For example, to wait for a port to be occupied, timing out after 3 seconds::
portend.occupied('www.pkgsrc.org', 80, timeout=3)
Or to wait for a port to be free, timing out after 5 seconds::
portend.free('::1', 80, timeout=5)
The portend may also be executed directly. If the function succeeds, it
returns nothing and exits with a status of 0. If it fails, it prints a
message and exits with a status of 1. For example::
python -m portend localhost:31923 free
(exits immediately)
python -m portend -t 1 localhost:31923 occupied
(one second passes)
Port 31923 not bound on localhost.
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