[Bug libc/23680] Feature Request: Add functions to convert between UID and group name

["carlos at redhat dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=23680

Carlos O'Donell <carlos at redhat dot com> changed:

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                 CC|                            |carlos at redhat dot com

--- Comment #1 from Carlos O'Donell <carlos at redhat dot com> ---
(In reply to Dylan Stephano-Shachter from comment #0)
> Currently, in glibc, the best way I am aware of to convert a gid to a group
> name is to run getgrgid(). The problem is this also fetches every user of
> the group. If the group is very large this can take a long time, especially
> if it is done over a network.
> 
> Would it be possible to add functions which could convert between between
> gid and name? Possibly along the lines of
> convertgrgid()
> convertgrnam()

These would just be wrappers around setgrent/getgrent/endgrent?

Fundamentally you have to iterate over all groups, find the one with the
matching group ID and return that. Thus your iteration could end early or be
forced to iterate the entire list.

> I would be willing to write the patch but I would like to know if it would
> even get accepted before I move forward.

Does setgrent/getgrent/endgrent solve hte problem for you?

We try hard not to add new functions to core libraries unless there is no
possible way to implement it without a combination of other functions.

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