Re: curl_mime_data_cb() with curl_easy_duphandle()

On 07.01.2020 at 16:54, Daniel Stenberg wrote:

> On Tue, 7 Jan 2020, Christoph M. Becker wrote:
>
>> I could pass in a CURL handle pointer, but if that CURL handle is
>> later duplicated with curl_easy_duphandle(), both handles would share
>> the same structure, which still holds the original CURL handle.  In
>> other words, whenever readfunc, seekfunc or freefunc set via
>> curl_mime_data_cb() is called, the functions get the same custom arg
>> for all duplicated handles.
>
> How else would you have it work?

It might have been useful (for me) if the three callback functions had
an additional parameter for the CURL handle.

>> wrt. duplicated handles and potentially asynchronous execution
>> (curl_multi_perform()) it is necessary to actually rebuild the whole
>> mime structure when a handle is duplicated, and to set this as
>> CURLOPT_MIMEPOST for the duplicated handle.
>
> That should be a doable way, yes.

Indeed, it looks that way. :)

Thanks!

--
Christoph M. Becker
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