Hi All,

I've attached a small patch for curl-7.9.17 which is based on the
connect-progress-2.patch created by Dan Stenberg that is posted here
http://curl.haxx.se/mail/lib-2010-01/0077.html

Basically instead of invoking the progress callback during the connect
process and sending 0 values for all the speed arguments, I've created
a couple new curl options called CURLOPT_CONNECTINGFUNCTION, and
CURLOPT_CONNECTINGDATA. Using these will allow you to delegate
progress info and connect status info separately in your applications.

The first curl option takes a pointer to a curl_connecting_callback defined as:

  typedef int (*curl_connecting_callback)(CURL *curl, enum
curl_connstat st, void *ptr);

The function gets invoked after DNS resolution when curl tries to
connect to an IP address. It gets called approximately once per second
until the connection succeeds or fails. Returning a non-zero value
from this callback will cancel the operation. The possible connection
status values are defined as:

  enum curl_connstat {
    CURL_CONN_STILL, /* still connecting */
    CURL_CONN_OK, /* successfully connected */
    CURL_CONN_ERROR, /* failed connecting */
    CURL_CONN_LAST /* not for use, marker for last-in-list */
  };

The second curl option is a custom pointer that will be the third
argument passed into the callback.

I haven't tested this extensively, but so far seems to work pretty
well. If anyone has any suggestions for how to make this better I
would love to hear it. So far the patch has been quite useful in one
of my current applications; I hope some of you will find it useful as
well.

--
nick jensen

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