Re: [Qemu-devel] [PATCH] sheepdog: Set error when connection fails

[Fam Zheng <famz@redhat.com>]

On Thu, 04/20 22:32, Kevin Wolf wrote:
> Am 20.04.2017 um 17:30 hat Daniel P. Berrange geschrieben:
> > On Thu, Apr 20, 2017 at 12:00:03PM +0800, Fam Zheng wrote:
> > > Signed-off-by: Fam Zheng <famz@redhat.com>
> > > ---
> > >  block/sheepdog.c | 1 +
> > >  1 file changed, 1 insertion(+)
> > > 
> > > diff --git a/block/sheepdog.c b/block/sheepdog.c
> > > index fb9203e..7e889ee 100644
> > > --- a/block/sheepdog.c
> > > +++ b/block/sheepdog.c
> > > @@ -608,6 +608,7 @@ static int connect_to_sdog(BDRVSheepdogState *s, Error **errp)
> > >          qemu_set_nonblock(fd);
> > >      } else {
> > >          fd = -EIO;
> > > +        error_setg(errp, "Failed to connect to sheepdog server");
> > >      }
> > 
> > This doesn't make much sense to me. The lines just above the
> > diff context have this:
> > 
> >     fd = socket_connect(s->addr, errp, NULL, NULL);

Oops! :(

> > 
> > socket_connect should have already reported an error on "errp"
> > in the scenario that 'fd == -1'.
> 
> By the way, am I the only one who thinks that having errp anywhere else
> than as the last argument is bad style? I can easily see myself missing
> that this functions sets it because the last argument is NULL.

Hmm, exactly.. Socket code does this here and there, and it's hard to read.

Fam