LibBSD | rtemsbsd/libio: Give a duplicated descriptor an identity of its own (!153)

[Sang Woo Kim (@sngwkim915)]

Sang Woo Kim created a merge request: https://gitlab.rtems.org/rtems/pkg/rtems-libbsd/-/merge_requests/153

Project:Branches: sngwkim915/rtems-libbsd:fix/descriptor-identity-7 to rtems/pkg/rtems-libbsd:7-freebsd-14
Author:   Sang Woo Kim



Five fixes for descriptor-identity defects found while running an EPICS IOC on libbsd: dup() of a socket returns a broken descriptor (#101), a kqueue-registered descriptor can never be closed (#102), pipe() is not connected to the libbsd implementation (#39), select/poll drop the hold of the wrong descriptor after a dup2 (#103), and getdirentries() reads a vnode out of a descriptor that has none (#104). Each commit carries a testsuite case that fails on the unfixed branch and passes at its commit point; a full testsuite sweep on the series tip matches the base sweep.

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View it on GitLab: https://gitlab.rtems.org/rtems/pkg/rtems-libbsd/-/merge_requests/153
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