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Subject: Re: How should my libssh2 program detect when the data upload failed because the destination partition ran out of space?

Re: How should my libssh2 program detect when the data upload failed because the destination partition ran out of space?

From: Jeremy Friesner <jfriesne_at_gmail.com>
Date: Sat, 17 May 2014 08:15:33 -0700

On May 17, 2014, at 1:08 AM, Daniel Stenberg <daniel_at_haxx.se> wrote:

> On Fri, 16 May 2014, Jeremy Friesner wrote:
>
>> The problem I ran into today involves the scenario when there isn't enough drive-space free on the remote machine to hold the entire 152MB file. What I would expect to have happen in this case is for libssh2_channel_write() to return an error-code at some point to indicate the failure, but the behavior I observe instead is that libssh2_channel_write() keeps on behaving normally (i.e. returning positive values or -1/LIBSSH2_ERROR_EGAIN, since I'm using non-blocking I/O), as if the file transfer was working fine.
>
> I would expect that to happen as well. Your server obviously doesn't return any error for this...
>
>> I note that scp did detect the error, but not until *after* it had already uploaded all 152MB to the server.
>
> Which sounds like a sympthom of the same thing.

Yes, I expect it is — OTOH, the scp client was able to print the appropriate error message, so it must be doing something that my program doesn’t do, in order to do that.

>> Otherwise, where are all those bytes of data being placed during the upload?
>
> That would be a question to whoever did the server you're talking to that eats the bytes.

The server is the sshd that ships with Debian Linux; I’m not very clear about who to contact about that…

Jeremy

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Received on 2014-05-17

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