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Re: TFTP and the Multi Interface

From: Daniel Stenberg <>
Date: Wed, 11 Feb 2009 11:04:08 +0100 (CET)

On Tue, 10 Feb 2009, Chad Monroe wrote:

> I'm finishing up testing of my TFTP multi code but have one question. When
> using the easy interface, tftp_disconnect() gets called properly via
> close_connections() in Curl_close() which is what curl_easy_cleanup() calls.
> In the case of the multi interface, tftp_disconnect() never gets called,
> leading to a ~4Kb memory leak on handle deletion.

That sounds strange. When the multi interface is used, the connection cache is
owned by the multi handle so thus tftp_disconnect() should be called when the
connection cache is cleared, which should should happen when you call
curl_multi_cleanup(). Unless the connection didn't fit in the cache due to
size restraints, but then the connection should get disconnected immedately
after the transfer was done.

> Looking at curl_multi_cleanup(), it seems I need to add PROT_TFTP to the
> PROT_CLOSEACTION mask in urldata.h. This solves my problem, but is it the
> correct fix?

No it isn't. That PROT_CLOSEACTION is meant for protocol actions necessary
when a connection is to be disconnected, which so far FTP is the only one
as it wants a "QUIT" command issued.

Anyway, if you post your current work/patch perhaps we can help out better!

Received on 2009-02-11