FILE's _file can only hold a short

Eitan Adler lists at
Fri Nov 2 02:42:20 UTC 2012

On 1 November 2012 10:40, Ian Lepore <freebsd at> wrote:
> On Wed, 2012-10-31 at 11:12 -0700, mdf at wrote:
>> I seem to recall a thread earlier on this limitation, but looking at
>> actual libc/stdio sources, the 4 year old check for open(2)'s fd being
>> less than SHRT_MAX is still there.  I thought I saw a patch to change
>> this to an int, but it's not in the tree.  Was this in a PR or a
>> mailing list thread or am I just imagining things?
>> We've run into this limitation at work, where some processes have
>> around 32k open file descriptors and then try to use the libc FILE
>> interface.  Since we control ABI we can just change this to int, but I
>> had been hoping there was a FreeBSD revision we could pull instead of
>> having another diff.
> FWIW, I also remember some discussion recently (this year) on some
> mailing list about this, but I can't find it now.  I thought it was
> somehow related to in-lib versus external uses of the funopen()
> function, but I may be conflating two unrelated discusssions in my head.


Eitan Adler

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