Man pages and other related help documents for portreserve.
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Reserve ports to prevent portmap mapping them
The portreserve program aims to help services with well-known ports that lie in the bindresvport() range (currently 600-1023).. It prevents programs requesting a port to the libc from occupying a real service's port by occupying it itself, until the real service tells it to release the port (generally in the init script).