Re: Getting error string from a failed ssh command

[Norm Green <norm.green@xxxxxxxxxxxxxxxxxx>]

That was it, thank you!!

Norm Green

On 10/4/2022 4:28 AM, Jakub Jelen wrote:
> On 10/4/22 00:36, Norm Green wrote:
> > Hello libssh list,
> >
> > If I run a command over ssh that fails from the Linux command line:
> >
> > normg@moop>ssh hood foo
> > bash: foo: command not found
> > normg@moop>echo $?
> > 127
> >
> >
> > I get an error string ("bash: foo: command not found") and an error 
> > code (127). For example:
> > My question is how to do the equivalent with libssh ?
> > If I do this after opening a session and a channel:
> >
> > int rc = ssh_channel_request_exec(sshChannel, "foo");
> > int bytesReady = ssh_channel_poll_timeout(sshChannel, timeout, FALSE);
> >
> > returns -127 and:
> >
> > int numRead = ssh_channel_read_timeout(sshChannel,
> >                               resultBuffer.nextWriteByte(),
> >                               (int) resultBuffer.bytesFree(),
> >                               0, // timeout: block in poll, not here
> >                               0);
> >
> > returns 0, so I don't get the error string back from libssh.
> > How can I get the error string result from the failed command using 
> > libssh ?
>
> I think you need to set the `is_stderr` argument of the 
> `ssh_channel_read_timeout()` to true to get this message as it will 
> most likely be on the standard error instead of standard output you 
> are querying.
>
> Regards,