[Bug time/11620] Bad design of timezone conversions

["david.ward at ll dot mit.edu" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=11620

David Ward <david.ward at ll dot mit.edu> changed:

           What    |Removed                     |Added
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                 CC|                            |david.ward at ll dot mit.edu

--- Comment #9 from David Ward <david.ward at ll dot mit.edu> ---
(In reply to Maxim Yegorushkin from comment #8)
> Upstream tz project exposes the functions required for easy and thread-save
> timezone conversions, see
> https://github.com/eggert/tz/blob/master/private.h#L409
> 
> Would it be possible to expose these NETBSD_INSPIRED 4 functions in glibc?

This now appears on the glibc master to-do list:
https://sourceware.org/glibc/wiki/Development_Todo/Master#MT-Safe_and_TZ-aware_functions


I also would like to see these functions added to glibc, especially for thread
safety reasons. The tz project implements these functions in a static library
(libtz.a), but that is only intended to be used directly with the bundled
utilities, as can be seen at the top of the header file referenced above:

    /*
    ** This header is for use ONLY with the time conversion code.
    ** There is no guarantee that it will remain unchanged,
    ** or that it will remain at all.
    ** Do NOT copy it to any system include directory.
    ** Thank you!
    */


The same functions are also exposed by gnulib, but unfortunately its
implementation is not thread-safe: the localtime_rz and mktime_z functions are
essentially wrappers around localtime_r and mktime, which modify the TZ
environment variable before or after if needed.

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