FILE's _file can only hold a short

mdf at mdf at
Fri Nov 2 19:09:40 UTC 2012

On Thu, Nov 1, 2012 at 7:41 PM, Eitan Adler <lists at> wrote:
> 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.
> Perhaps
> ?

Yes, that was it exactly.  Thanks!  My (quick) search had not been fruitful.


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