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Re: Curl_ossl_connect is blocking

From: Daniel Stenberg <>
Date: Mon, 13 Mar 2006 16:12:30 +0100 (CET)

On Mon, 13 Mar 2006, Xavier Bouchoux wrote:

> I noticed that Curl_ossl_connect doesn't return until the connection is
> fully negotiated, and blocks on select calls.

Unfortunately it does! ;-(

> My plan is to make a Curl_http_connecting() in addition to
> Curl_http_connect(), that would deal with the ssl negotiation, so that the
> connection will be in the "CURLM_STATE_PROTOCONNECT" during this phase.
> is this the correct way, or should I try to extend Curl_http_connect() so
> that the ssl is done when it completes. (and thus staying in

I'm not sure it makes any significant difference. Do you?

Just note that Curl_ssl_connect() is called from numerous places and it is not
easily fixed as described on all those places so you should probably make some
(or most) of the existing calls remain blocking so that they can be fixed
one-by-one later on.

> Moreover I fail to understand in the simple case (ie not "multi" case) when
> this function is called. (I mean, in url.c SetupConnection(),
> curl_protocol_connect() is called and then the value of protocol_done is
> ignored all the way to the initial caller and curl_protocol_connecting()
> never seems to be called. how should it work in that case?

Because, in the easy interface case, the singleipconnect() function simpy
waits for the connect and doesn't return until it has connected or timed out
so Curl_connecthost() (called from within ConnectPlease()) will return with
the connection already established.

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Received on 2006-03-13