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RE: Connection to file server disconnected while file transfer is in progress

From: vaibhav.taksale--- via curl-library <curl-library_at_cool.haxx.se>
Date: Wed, 25 Aug 2021 04:43:30 +0000

Hi Daniel,
> Which libcurl version on which platform is this?
[Vaibhav] Libcurl version 7.58 Used on Embedded Linux platform on ar758x board.

> libcurl will not reconnect nor resume anything on error. It should return an error.
[Vaibhav] Yes. If there is disconnection with file server (due to any reason), I was expecting error return so that application can restart file transfer.
e.g. In this function callback "writeCallback", error return was expected.
        curl_easy_setopt(
            l_easy, CURLOPT_WRITEFUNCTION, (curl_write_callback)[](auto a_data, auto, auto a_size, auto a_client) {
                return CURL_CLIENT(a_client)->writeCallback(a_data, a_size);
            });
        curl_easy_setopt(l_easy, CURLOPT_WRITEDATA, this);

> Is this an upload or a download? Exactly how is that "FTP disconnection" done?
> Can you provide a small stand-alone example program that reproduces the problem?
[Vaibhav] This is download. I will provide small code writeup.

Regards,
Vaibhav

-----Original Message-----
From: Daniel Stenberg <daniel_at_haxx.se>
Sent: Tuesday, 24 August, 2021 20:57
To: vaibhav.taksale--- via curl-library <curl-library_at_cool.haxx.se>
Cc: Taksale Vaibhav (M) <vaibhav.taksale_at_external.marelli.com>
Subject: Re: Connection to file server disconnected while file transfer is in progress

On Tue, 24 Aug 2021, vaibhav.taksale--- via curl-library wrote:

> Connection to file server disconnected while file transfer is in
> progress CURL does not get this disconnection response and will
> continue to wait for file transfer.

That's a bug then. Either in your code or in libcurl.

Which libcurl version on which platform is this?

> Thus, CURL is not attempting reconnection to resume file transfer.

libcurl will not reconnect nor resume anything on error. It should return an error.

> Steps: successful connection to file server (filezilla) with valid
> credentials File transfer started possible FTP disconnection and file
> transfer is aborted.

Is this an upload or a download? Exactly how is that "FTP disconnection" done?

Can you provide a small stand-alone example program that reproduces the problem? 

-- 
  / daniel.haxx.se
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Received on 2021-08-25