[Bug 282393] fchmod() on an UNIX socket before bind()

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=282393

            Bug ID: 282393
           Summary: fchmod() on an UNIX socket before bind()
           Product: Base System
           Version: 14.0-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: vini.ipsmaker@gmail.com

Linux implements a trick to allow control over the creation permission/mode of
UNIX sockets:

* https://stackoverflow.com/a/74329441/883113
* https://illumos.topicbox.com/groups/developer/Tfaa228b0d7902cf5

Can we have something similar on FreeBSD? Reusing the same interface would be
good for compatibility with current Linux tools (maybe IllumOS too in the
future as seen from the previous links). However for my own projects, I don't
mind using FreeBSD specific interfaces (perhaps a new socket option). My
current workaround is umask, but umask doesn't play nice with multithreaded
processes.

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