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Date: Wed, 14 Feb 2018 15:11:34 -0500
From: Andrew Bell <>
Subject: Re: fwrite() - possible division by zero

On Wed, Feb 14, 2018 at 3:07 PM, Markus Wichmann <> wrote:

> On Wed, Feb 14, 2018 at 02:48:14PM -0500, Andrew Bell wrote:
> > Why not early return if size == 0 and avoid the call to __fwritex
> > altogether?
> >
> Because it's a rare corner case? Here, there's also locking correctness
> to consider: fwrite() has to block until f is unlocked, irrespective of
> parameters. So there's no real benefit to doing an early return.

But it's already being checked to set nmemb to 0.  Couldn't you just return
0 and avoid the lock as well?

Andrew Bell

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