[Bug 260241] [feature request] Provide a sysctl or fcntl that would return the list of paths for a given file descriptor

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=260241

            Bug ID: 260241
           Summary: [feature request] Provide a sysctl or fcntl that would
                    return the list of paths for a given file descriptor
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: yuri@freebsd.org

At least two projects are blocked on FreeBSD due to inability of such lookup:

1. sysutils/watchman
2. The USD project:
https://github.com/PixarAnimationStudios/USD/blob/release/pxr/base/arch/fileSystem.cpp#L470


This was discussed in hackers@ around July 2021.

It would be beneficial if sysctl or fcntl would be able to return a list of
file paths for a given file descriptor.
This list of paths can be empty when the file is deleted, or it can have
multiple paths when the file is hard-linked.


Yuri

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