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Date: Thu, 7 Jan 2010 12:44:17 +0000
From: "Daniel P. Berrange" <berrange@redhat.com>
Subject: Re: [Qemu-devel] -serial stdio broken
Message-ID: <20100107124417.GA9028@redhat.com>
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To: Anthony Liguori <anthony@codemonkey.ws>
Cc: Blue Swirl <blauwirbel@gmail.com>, qemu-devel <qemu-devel@nongnu.org>, "Richard W.M. Jones" <rjones@redhat.com>, Gerd Hoffmann <kraxel@redhat.com>

On Thu, Jan 07, 2010 at 06:34:13AM -0600, Anthony Liguori wrote:
> On 01/07/2010 05:55 AM, Richard W.M. Jones wrote:
> >On Sun, Dec 13, 2009 at 08:24:54AM +0000, Blue Swirl wrote:
> >   
> >>I guess e1c09175bc00dd8dfb2ad1b26e1858dcdc109b59 or
> >>998bbd74b9d813b14a3a3b5009a5d5a48c7dce51 broke -serial stdio for all
> >>targets:
> >>qemu -serial stdio -monitor stdio
> >>chardev: opening backend "stdio" failed
> >>qemu: could not open serial device 'stdio': No such file or directory
> >>     
> >-serial stdio on its own is broken for me (qemu from git).  The error
> >is a little bit different, so I don't think this is the same bug:
> >
> >   chardev: opening backend "stdio" failed
> >   qemu: could not open serial device 'stdio': Invalid argument
> >
> >The full command line is:
> >
> >$qemudir/x86_64-softmmu/qemu-system-x86_64 \
> >     -L $qemudir/pc-bios \
> >     -drive file=/tmp/test.img,cache=off,if=ide \
> >     -m 500 \
> >     -no-reboot \
> >     -nographic \
> >     -serial stdio \
> >   
> 
> This is redundant.  -nographic implies -serial stdio.

NB, QEMU 0.12 introduces a new flag '-nodefaults' that can be used to
get rid of this imlied 'serial stdio', and all other implied devices.
It is well worth using this new -nodefaults flag if you're managing
qemu from an app to avoid these surprises

eg this should work as you'd expect it

  qemu -nodefaults -nographic -serial stdio

Regards,
Daniel
-- 
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