Re: [Qemu-devel] [questions] about qemu log

[Peter Crosthwaite]

On Wed, Aug 6, 2014 at 6:48 AM, William Dauchy <address@hidden> wrote:
> On Tue, Jul 29, 2014 at 9:51 PM, Eric Blake <address@hidden> wrote:
>> The output is on qemu's stderr.  You are in control of what that stderr is.
>
> I don't get why we can configure
> -D /path/to/unique/file/name.log
>
> but we also have to redirect stderr (I didn't checked if the daemonize
> option was closing it). What's the purpose of this logfile option?
>

Well -D will log to file only loggable (i.e. qemu_log()) information
(which has all sorts of options and switches). Stderr, is a little
more static and should in theory be limited to genuine errors. But if
you want a combined log of both you can simply omit -D to default
qemu_log output to stderr. This gives you a combined log that you can
redirect anywhere. To be honest, this is what I do as a matter of
course (2> foo rather than -D foo).

There's plently of tree wide work to clean up the cases where stderr
is used where qemu_log should be. If you are finding that log
information is going to stderr instead of the log, patches would be
welcome.

Regards,
Peter

> --
> William
>