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Re: [PATCH] Fix for intermittent upload failure

From: Daniel Stenberg <>
Date: Mon, 14 Apr 2014 23:54:07 +0200 (CEST)

On Fri, 11 Apr 2014, David Warman wrote:

> I ran into an issue where SSL based uploads were failing sometimes. I
> eventually traced this to a problem with EAGAIN near the start of the
> transfer, before any data had been sent. This only happened to me with SSL,
> although it may be possible under other conditions.

Thanks a lot for helping us improve libcurl. A question though on your patch:

You say in the commit message:

  "If this module doesn't know the final upload size, data->set.infilesize may
   be zero."

...but that's not true! Internally it is set to -1 by default and I just
checked the man page and it says -1 should be used to "unset" the value.

Can you elaborate on when this variable legitimately would be 0 to signal
unknown size?

I'm asking since the rest of the patch seems to build on that condition and I
want to understand that condition better first!

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Received on 2014-04-14