Re: curl_mime_data_cb() with curl_easy_duphandle()

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?

> 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.

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