[glibc PATCH] fcntl: put F_OFD_* constants under #ifdef __USE_FILE_OFFSET64

Florian Weimer fweimer@redhat.com
Wed Aug 17 17:34:00 GMT 2016


On 08/17/2016 04:47 PM, Jeff Layton wrote:
> The Linux kernel expects a flock64 structure whenever you use OFD locks
> with fcntl64. Unfortunately, you can currently build a 32-bit program
> that passes in a struct flock when it calls fcntl64.
>
> Only define the F_OFD_* constants when __USE_FILE_OFFSET64 is also
> defined, so that the build fails in this situation rather than
> producing a broken binary.

Doesn't this affect legacy POSIX-style locks as well, under very similar 
circumstances?

Thanks,
Florian



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