[Bug libc/22099] getconf help info

["eblake at redhat dot com" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=22099

Eric Blake <eblake at redhat dot com> changed:

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                 CC|                            |eblake at redhat dot com

--- Comment #1 from Eric Blake <eblake at redhat dot com> ---
This came up in the Austin Group meeting today:
https://austingroupbugs.net/view.php?id=1808

POSIX is considering standardizing 'getconf -a'; so the inconsistency  between
'getconf' stating that -a is supported, and 'getconf --help' not mentioning it,
should be fixed.

It was also uncertain whether 'getconf -a /some/file' can ever have output
different than 'getconf -a'.  The former should list values specific to
fpathconf for /some/file, that may have different values depending on the file
system underlying that file, while the latter should list values specific to
getconf; however, the Austin Group noted that at least 'getconf -a | grep
NAME_MAX' vs. 'getconf -a . | grep NAME_MAX' gave the same input, but I'm not
sure if there is an easy way to trigger a given file name that would
demonstrate a path-specific result from fpathconf.

BSD also has 'getconf -l' which lists the names (but not results) of the
various getconf/fpathconf constants (useful since some of the results can be
strings that might include a newline, rendering the output of -a ambiguous).

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