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RE: curl_multi_fdset always returns -1 for maxfd

From: Vishakha Vaidya <>
Date: Thu, 13 Nov 2014 09:54:21 +0000

> -----Original Message-----
> From: curl-library [] On Behalf Of Daniel Stenberg
> Sent: Thursday, November 13, 2014 2:10 PM
> To: libcurl development
> Subject: RE: curl_multi_fdset always returns -1 for maxfd
> On Wed, 12 Nov 2014, Vishakha Vaidya wrote:
> >> No. You want curl_multi_fdset() to figure out what to wait for, but
> >> if there's nothing to wait for you can/should just wait a short while
> >> instead of calling select().
> > It doesn't work. Unless I keep calling multi_perform in a loop, the
> I don't understand what you say here. The sleep I mentioned would be instead of select() when maxfd is -1, you would of course still call
> curl_multi_perform() until the transfer is complete.

> Is this not clear in the documentation and examples?

The code I sent earlier is multi-single.c from doc/examples & my point is that the code hangs, if its used with libcurl, thats built with async enabled. What I need is, help in figuring out if I'm missing any build settings or curl options?

> > Are you unable to reproduce the problem, with the code I sent?
> Exactly, but I don't develop on or run Windows so I haven't tried it in your exact conditions.

Are you saying that the problem in not reproducible on linux, built with async (C-ARES or THREADS)?


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Received on 2014-11-13