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Date: Sat, 10 Aug 2019 13:15:34 -0700
From: Paul Eggert <>
To: Rich Felker <>,
Subject: Re: time64 abi choices for glibc and musl

Rich Felker wrote:
> For struct stat, I think it's almost necessary to preserve the
> existing layout and add new time64 members on the end, and to continue
> filling in the time32 members.

This won't be reliable for applications that call 'stat', fiddle with the 
timestamps in the resulting 'struct stat', and then pass the fiddled-with struct 
to some other function. If they fiddle with the 64-bit timestamp the 32-bit copy 
will become wrong, and vice versa.

There are similar issues for applications that create struct stat values by 
hand, without calling a 'stat'-like function.

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