LibBSD | dup() and fcntl(F_DUPFD) fail with ENXIO for libbsd descriptors (#101)

[Sang Woo Kim (@physwkim)]

Sang Woo Kim commented: https://gitlab.rtems.org/rtems/pkg/rtems-libbsd/-/work_items/101#note_155842


The test and the fix are up as !153: commit 1 fixes dup()/F_DUPFD for libbsd descriptors, and the new `dup01` testsuite case captures the EPICS use case — it fails with ENXIO on the unfixed branch.

On the default case: `fcntl_h` is a post-hook that cpukit's `vfcntl()` calls after its own switch on every command that succeeded there, so an error in the default arm would fail F_DUPFD, F_GETFD, F_GETFL and F_DUP2FD on every libbsd descriptor. The commands libbsd cannot support are already rejected before the hook runs.

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View it on GitLab: https://gitlab.rtems.org/rtems/pkg/rtems-libbsd/-/work_items/101#note_155842
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