This is the mail archive of the
mailing list for the glibc project.
Re: Is Y2038-proofing in a glibc roadmap somewhere?
- From: Zack Weinberg <zackw at panix dot com>
- To: Albert ARIBAUD <albert dot aribaud at 3adev dot fr>
- Cc: Joseph Myers <joseph at codesourcery dot com>, libc-alpha at sourceware dot org
- Date: Mon, 3 Aug 2015 11:17:17 -0400
- Subject: Re: Is Y2038-proofing in a glibc roadmap somewhere?
- Authentication-results: sourceware.org; auth=none
- References: <20150618150835 dot 315775b7 dot albert dot aribaud at 3adev dot fr> <20150618132533 dot GG22285 at port70 dot net> <20150618154948 dot 714738c2 dot albert dot aribaud at 3adev dot fr> <20150709100932 dot 3dd2cbf7 dot albert dot aribaud at 3adev dot fr> <alpine dot DEB dot 2 dot 10 dot 1507221418360 dot 21570 at digraph dot polyomino dot org dot uk> <20150803104325 dot 2ec7b9ea dot albert dot aribaud at 3adev dot fr> <CAKCAbMgABZf4bU0FNu1-9bJtM3aS6mPxiZH+J5yk-EsBPReWiA at mail dot gmail dot com> <20150803153622 dot 20ea3971 dot albert dot aribaud at 3adev dot fr>
On Mon, Aug 3, 2015 at 9:36 AM, Albert ARIBAUD <firstname.lastname@example.org> wrote:
>> 'struct stat', for instance, contains both time_t and
>> off_t quantities, so there would have to be four different definitions
>> of it if _FILE_OFFSET_BITS and _TIME_BITS were independent, but only
>> three if _TIME_BITS=64 requires _FILE_OFFSET_BITS=64. And restricting
>> it to three variants also makes it more likely that the different
>> structures can be told apart by sizeof().
> I get the idea, although I am not sure why we would want to use
> structure size to tell variants apart. If we know there are variants
> to begin with, then we know on which macro these variants depend and we
> can tell the variants apart based on which macros are defined, could
> we not?
This is only a relevant factor in cases when you can't tell them apart
any other way. 'struct stat' was a bad example because that's already
handled with the xstat mechanism and the '64' suffix, but imagine that
there's some poorly-documented ioctl() taking a structure containing
both an off_t and a struct timespec.