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fd: add fget_only_user

Description

fd: add fget_only_user

This can be used by single-threaded processes which don't share a file
descriptor table to access their file objects without having to
reference them.

For example select consumers tend to match the requirement and have
several file descriptors to inspect.

Details

Provenance
mjgAuthored on Jan 28 2021, 11:27 PM
Parents
rGabd619045a54: __FreeBSD_version: update the references to the doc tree
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