[Bug 217821] New: document that Linux' open(2) uses ENXIO in case of sockets, while POSIX mandates EOPNOTSUPP

[bugzilla-daemon@kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=217821

            Bug ID: 217821
           Summary: document that Linux' open(2) uses ENXIO in case of
                    sockets, while POSIX mandates EOPNOTSUPP
           Product: Documentation
           Version: unspecified
          Hardware: All
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P3
         Component: man-pages
          Assignee: documentation_man-pages@kernel-bugs.osdl.org
          Reporter: calestyo@scientia.org
        Regression: No

Hey.

It seems that under Linux, when using a socket file with the open(2) family of
functions, the error is:
> ENXIO  The file is a UNIX domain socket.

OTOH, POSIX specifies[0]:
> [EOPNOTSUPP]
>    The path argument names a socket.


Maybe it makes sense to document that? Possibly right at the ENXIO descripton
and even additionally in the STANDARDS section?

I could write a patch if you tell me which you like.

Cheers,
Chris.


[0] https://pubs.opengroup.org/onlinepubs/9699919799/functions/open.html

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