[Bug 214171] New: I am not sure why the definition of EAI_SYSTEM, from getaddrinfo, was changed from POSIX

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https://bugzilla.kernel.org/show_bug.cgi?id=214171

            Bug ID: 214171
           Summary: I am not sure why the definition of EAI_SYSTEM, from
                    getaddrinfo, was changed from POSIX
           Product: Documentation
           Version: unspecified
          Hardware: All
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P1
         Component: man-pages
          Assignee: documentation_man-pages@kernel-bugs.osdl.org
          Reporter: christian.morales.vega@gmail.com
        Regression: No

https://man7.org/linux/man-pages/man3/freeaddrinfo.3p.html says:

"[EAI_SYSTEM] A system error occurred; the error code can be found in errno."

Which makes a lot of sense. The function can fall because of name-resolution
specific problem (EAI_NODATA). But otherwise it must be a plain old generic
error that can be expressed with errno, so you should look in errno.

It's not explicitly said. But IMHO it's clear that it would be a bug to return
EAI_SYSTEM without setting errno/setting errno to zero.


But then https://man7.org/linux/man-pages/man3/getaddrinfo.3.html replaces it
with:

"EAI_SYSTEM Other system error, check errno for details."

Which, I'm not a native speaker, but it seems to me to leave returning
EAI_SYSTEM and setting errno to 0 more open to interpretation. You can argue
that in such a case errno == 0 simply means "no details".

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