Re: [Qemu-devel] [Qemu-block] [PATCH v6 06/22] osdep: Introduce qemu_dup

[Fam Zheng <famz@redhat.com>]

On Fri, 06/17 15:08, Kevin Wolf wrote:
> Am 17.06.2016 um 14:32 hat Kevin Wolf geschrieben:
> > Am 03.06.2016 um 10:49 hat Fam Zheng geschrieben:
> > > This takes care of both the CLOEXEC flag and fd-path mapping for image
> > > locking.
> > > 
> > > Signed-off-by: Fam Zheng <famz@redhat.com>
> > > ---
> > >  include/qemu/osdep.h | 3 +++
> > >  util/osdep.c         | 9 +++++++++
> > >  2 files changed, 12 insertions(+)
> > > 
> > > diff --git a/include/qemu/osdep.h b/include/qemu/osdep.h
> > > index 749214a..89c63c7 100644
> > > --- a/include/qemu/osdep.h
> > > +++ b/include/qemu/osdep.h
> > > @@ -281,6 +281,9 @@ int qemu_madvise(void *addr, size_t len, int advice);
> > >  int qemu_open(const char *name, int flags, ...);
> > >  int qemu_close(int fd);
> > >  int qemu_lock_fd(int fd, int64_t start, int64_t len, bool exclusive);
> > > +#ifndef _WIN32
> > > +int qemu_dup(int fd);
> > > +#endif
> > >  int qemu_unlock_fd(int fd, int64_t start, int64_t len);
> > >  
> > >  #if defined(__HAIKU__) && defined(__i386__)
> > > diff --git a/util/osdep.c b/util/osdep.c
> > > index 085ed52..1c87c1e 100644
> > > --- a/util/osdep.c
> > > +++ b/util/osdep.c
> > > @@ -133,6 +133,15 @@ fail:
> > >      return -1;
> > >  }
> > >  
> > > +int qemu_dup(int fd)
> > > +{
> > > +    int r = qemu_dup_flags(fd, 0);
> > 
> > This clears all file status flags that might be set. I don't think we
> > use any of them (on Linux at least, raw-posix still seems to use it for
> > platform without O_DIRECT), but isn't this still surprising?
> 
> Maybe this means that qemu_dup_flags() should call qemu_dup() instead of
> the other way round.
> 

Yes, I think you are right.

Fam