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From: Martin Simmons <martin@lispworks.com>
To: freebsd@sysctl.cz
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Subject: Re: extattr
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>>>>> On Sun, 15 Mar 2020 18:21:34 +0100, freebsd  said:
> 
> Hi, i am trying make port for signal desktop application
> but i have problems in test. I patched this npm library for bsd.
> I am not sure with actual test, because bsd have maybe other 
> implementation and also a bit other results.
>   Do you have some skills in xattr ?
> 
> https://github.com/LinusU/fs-xattr/pull/37

Maybe look at the perl File::ExtAttr module for ideas?

https://metacpan.org/pod/File::ExtAttr

In particular, the OS detection:

https://metacpan.org/source/RICHDAWE/File-ExtAttr-1.09/extattr_os.h

__Martin