Hi Daniel! Thank you so much for your solicit answers!
Reading your answers I'm probably missing some basic concepts from curl
or, even worse, from linux programming! So let me explain what I need to
do.

> I don't get why you want that. You handle your descriptors, and you can
> have libcurl add its descriptors. Why would you remove any?

I'm developing a project for video surveillance based on IP cameras. I'm
using a framework
heavily based on file descriptors and select for timing and scheduling
events and actions.

Let's give an example. I have, among others, a unix socket for IPC with
another process.
Then I have to make a CGI requests to a bunch of IP cameras, 10 in my case,
periodically.

So I use select to monitor file descriptors (eg my unix socket), with tv
set to next timeout to handle. When I need
to make a bunch of CGI requests like in this example
http://curl.haxx.se/libcurl/c/multi-app.html
I set the file descriptors associated with my multi handle via
curl_multi_fdset. Then, after a number
of selects, when curl_multi_perform tells me that there are no more running
requests I would like
to unset the file descriptors associated with curl handles and continue
with my endless select
on my original file descriptors.
You say that I don't need it, so where am I wrong?

Thank you very much!

Federico

>
>
> I need that because I have to add curl fd's to an already existing set.
>>
>
> The function was designed to offer that. As the docs says
> "curl_multi_fdset() only adds its own descriptors". So you can set your own
> descriptors first and then ask libcurl to add its descriptors and you can
> then select() on the whole set in a single call.
>
>
> And another question: is there a way to get a fd of a specific curl
>> handle of a multi handle set?
>>
>
> No, but I would be interested in learning why you would want that? When
> you use the multi API you work on all the transfers at once and several
> easy handles can even (at times) share one or more file descriptors.
>
> --
>
> / daniel.haxx.se
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Received on 2014-07-08