Re: [Qemu-devel] [PATCH v1 01/22] s390: use FILE instead of QEMUFile for creating text file

["Daniel P. Berrange" <berrange@redhat.com>]

On Tue, Jan 12, 2016 at 12:58:10PM +0100, Cornelia Huck wrote:
> On Tue, 12 Jan 2016 11:43:55 +0000
> "Daniel P. Berrange" <berrange@redhat.com> wrote:
> 
> > The s390 skeys monitor command needs to write out a plain text
> > file. Currently it is using the QEMUFile class for this. There
> > is no real benefit to this, and the downside is that it needs to
> > snprintf via an intermediate buffer. Switching to regular FILE
> > objects simplifies the code.
> > 
> > Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
> > ---
> >  hw/s390x/s390-skeys.c | 19 +++++++------------
> >  1 file changed, 7 insertions(+), 12 deletions(-)
> 
> > @@ -124,7 +119,7 @@ void qmp_dump_skeys(const char *filename, Error **errp)
> >          return;
> >      }
> > 
> > -    f = qemu_fopen(filename, "wb");
> > +    f = fopen(filename, "wb");
> >      if (!f) {
> >          error_setg_file_open(errp, errno, filename);
> >          return;
> 
> Hmm...
> 
> https://marc.info/?l=qemu-devel&m=143740278908660&w=2
> 
> We'd lose the benefits from qemu_fopen() here again, or am I missing
> something?

Oh, that message shouldn't really have recommended qemu_fopen() - it only
needs qemu_open() to get the fd passing support. I'll change this to use
qemu_open() + fdopen() instead, so we still support FD passing while
using normal stdio.

Regards,
Daniel
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