[Bug libc/15607] Add threadsafe version of getenv()

["hadess at hadess dot net" <sourceware-bugzilla at sourceware dot org>]

http://sourceware.org/bugzilla/show_bug.cgi?id=15607

--- Comment #5 from Bastien Nocera <hadess at hadess dot net> ---
(In reply to Rich Felker from comment #4)
<snip>
> As far as I'm concerned, this bug report should be filed against
> gnome-settings-daemon,

The bug has already been reported and fixed against gnome-settings-daemon. Did
you follow the link?

> not glibc, and it should be fixed by (preferably)
> avoiding modification to the environment in the process itself and using the
> appropriate exec-type functions, or by generating a completely new
> environment and replacing extern char **environ atomically with a pointer to
> the new environment.

The problem is that even if we do that, the code sucks, and it's a huge amount
of code compared to what it could be. Do you have a better way to do this?

> Note that, if others do end up deeming it desirable to change glibc, the
> appropriate change would be having setenv do the above-described atomic
> replacement and simply leak the old environment. This would be fully safe
> with no locking.

Per-thread env?

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