RTEMS | fcntl(F_DUP2FD) onto a free descriptor yields a dead descriptor and leaves its iop on the free list (#5670)

[Joel Sherrill (@joel)]

Joel Sherrill commented: https://gitlab.rtems.org/rtems/rtos/rtems/-/work_items/5670#note_156332


@chris and I chatted about this. I went digging into the POSIX standard versions to see what they said and when. This requirement on the file descriptor number is a recent change from what I see in the published PDFs. As recently as POSIX Issue 7 (2013), this was the text:

> F_DUPFD Duplicate file descriptor.

It was still that way in a 2021 draft of POSIX Issue 8 (2024). But in the online HTML for Issue 6 (2004), it has the new text.

I am happy seeing this change. But the POSIX history on its addition is odd.

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/work_items/5670#note_156332
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