[Linux PATCH] fcntl: add new F_OFD_*32 constants and handle them appropriately

[Paul Eggert]

Zack Weinberg wrote:
> We could change the libc headers used on old-ILP32 ABIs so that
> _FILE_OFFSET_BITS=64 is defined by default (matching the LP64-ABI
> headers).  This would break the ABI of every shared library that
> exports a structure (transitively) containing a field of type off_t,
> ino_t, fsblkcnt_t, fsfilcnt_t, or rlim_t.

As I understand it, most (all important?) such libraries are already compiled 
with _FILE_OFFSET_BITS=64 anyway, so their ABIs wouldn't break.

How about if we start the transition by deprecating the use of 32-bit off_t in 
user or library code on platforms with 32-bit long? The attached patch plus lots 
of similar patches, say (this is just a sketch). Really, it's long since time 
that file offsets were 64 bits.
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