Re: [Qemu-devel] [PATCH v2 4/5] console: pass Monitor to vga_hw_screen_dump/hw_vga_dump

[Alon Levy]

On Wed, Mar 14, 2012 at 10:18:12AM -0300, Luiz Capitulino wrote:
> On Wed, 14 Mar 2012 15:14:10 +0200
> Alon Levy <address@hidden> wrote:
> 
> > On Wed, Mar 14, 2012 at 09:32:58AM -0300, Luiz Capitulino wrote:
> > > On Wed, 14 Mar 2012 08:37:13 +0000
> > > "Daniel P. Berrange" <address@hidden> wrote:
> > > 
> > > > > First, with this applied you will not know the size in advance.  Also
> > > > > one of the approaches discussed is to allow passing in a file handle.
> > > > > That is a possible way to handle async screendumps too: just write to
> > > > > the passed file handle and close it when done.  Obvious drawback is 
> > > > > that
> > > > > this will not cover the classic way of specifying the output filename 
> > > > > as
> > > > > argument.
> > > 
> > > As Daniel explains below, this is not a drawback and there's no problem
> > > supporting multiple ways of returning the image.
> > > 
> > > The real drawback of making this w/o async support is that you can't 
> > > detect
> > > errors.
> > > 
> > 
> > You also can't detect when the writing is done (unless you continuously
> > try to parse the file yourself..)
> 
> Oh, really? For some reason I had a pipe in my mind, but I honestly don't
> what's the semantics of fd passing in that regard.

Like Daniel pointed out, I am dead wrong here, sorry for the noise.