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duphandle and multi interface

From: Frank Hempel <>
Date: Sat, 28 Apr 2007 18:45:56 +0200


When I have used an easy handle on a multi stack, I can only duplicate
it as long as it belongs to the (living) multi stack. As soon as one
removes it from the multi handle (curl_multi_remove_handle) or cleans up
  the whole multi handle (curl_multi_cleanup), it can be no longer
duplicated, because the internal variable
easyhandle->state.interface_used is still set to Curl_if_multi and the
connection cache (state->connc) is NULLed which leads to an abort in

Is this wanted behaviour?

In case it is not, the following patch might be usefull. It simply sets
the interface_used variable to Curl_if_none when the association between
the easy and the multi handle is released.

So far, Ciao, Frank.

*** easy.c.orig 2007-04-09 23:00:57.000000000 +0200
--- easy.c 2007-04-28 18:41:58.000000000 +0200
*************** void Curl_easy_addmulti(struct SessionHa
*** 511,516 ****
--- 511,517 ----
                          void *multi)
    data->multi = multi;
+ if (multi == NULL) data->state.used_interface = Curl_if_none;
Received on 2007-04-28