KERN_PROC_FILEDESC equivalent in NetBSD?

[Kamil Rytarowski <n54%gmx.com@localhost>]

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How to get KERN_PROC_FILEDESC  functionality in NetBSD?

At the moment I'm aware of the Linux-compat way to parse /proc/$PID/fd.

I need this feature for radare2[1] feature-completeness in NetBSD.

[1]
https://github.com/radare/radare2/blob/30b61d49ec3a9aa41b6fccefe0a8ca679
1426fe3/libr/debug/p/debug_native.c#L1156
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