On Sun, 10 Jul 2011 15:18:41 +0300, Pekka Enberg <penberg@xxxxxxxxxx> wrote: > On Sun, Jul 10, 2011 at 3:01 PM, Konstantin Khlebnikov > <khlebnikov@xxxxxxxxxx> wrote: > > glibc declare ftruncate() with attribute warn_unused_result, so result must be "checked", otherwise we get: > > > > virtio/9p.c:487:6: error: variable ‘res’ set but not used [-Werror=unused-but-set-variable] > > or > > virtio/9p.c:496:12: error: ignoring return value of ‘ftruncate’, declared with attribute warn_unused_result [-Werror=unused-result] > > > > Signed-off-by: Konstantin Khlebnikov <khlebnikov@xxxxxxxxxx> > > --- > > tools/kvm/virtio/9p.c | 1 + > > 1 files changed, 1 insertions(+), 0 deletions(-) > > > > diff --git a/tools/kvm/virtio/9p.c b/tools/kvm/virtio/9p.c > > index d927688..4586f66 100644 > > --- a/tools/kvm/virtio/9p.c > > +++ b/tools/kvm/virtio/9p.c > > @@ -495,6 +495,7 @@ static void virtio_p9_wstat(struct p9_dev *p9dev, > > > > if (wstat.length != -1UL) > > res = ftruncate(fid->fd, wstat.length); > > + (void)res; /* To plug the warning. FIXME what if ftruncate fails? */ > > There's a > > make WERROR=0 > > to work around the warning. Sasha, Aneesh, shouldn't we propagate an > error to the guest here? > Yes we should. We should do an RERROR message to the guest. I guess other functions in 9p.c is also missing error handling. -aneesh -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
