Re: [Qemu-devel] [PATCH] linux-user: fix includes to find SIOCGSTAMP with latest kernel headers

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

On Mon, Jun 17, 2019 at 01:47:48PM +0200, Laurent Vivier wrote:
> Le 17/06/2019 à 13:40, Daniel P. Berrangé a écrit :
> > The SIOCGSTAMP symbol was previously defined in the
> > asm-generic/sockios.h header file. QEMU sees that header
> > indirectly via
> > 
> >    sys/socket.h
> >     -> bits/socket.h
> >         -> asm/socket.h
> >             -> asm-generic/socket.h
> >                 -> asm/sockios.h
> >                     -> asm-generic/sockios.h
> > 
> > In linux kernel commit 0768e17073dc527ccd18ed5f96ce85f9985e9115
> > the asm-generic/sockios.h header no longer defines SIOCGSTAMP.
> > Instead it provides only SIOCGSTAMP_OLD.
> > 
> > The linux/sockios.h header now defines SIOCGSTAMP using either
> > SIOCGSTAMP_OLD or SIOCGSTAMP_NEW as appropriate. This linux only
> > header file is not pulled in by QEMU though, so we get a build
> > failure:
> > 
> > qemu/linux-user/ioctls.h:225:9: error: ‘SIOCGSTAMP’ undeclared here (not in a function); did you mean ‘SIOCSRARP’?
> >   225 |   IOCTL(SIOCGSTAMP, IOC_R, MK_PTR(MK_STRUCT(STRUCT_timeval)))
> >       |         ^~~~~~~~~~
> > qemu/linux-user/syscall.c:4855:23: note: in definition of macro ‘IOCTL’
> >  4855 |     { TARGET_ ## cmd, cmd, #cmd, access, 0, {  __VA_ARGS__ } },
> >       |                       ^~~
> > qemu/linux-user/ioctls.h:226:9: error: ‘SIOCGSTAMPNS’ undeclared here (not in a function); did you mean ‘SIOCGSTAMP_OLD’?
> >   226 |   IOCTL(SIOCGSTAMPNS, IOC_R, MK_PTR(MK_STRUCT(STRUCT_timespec)))
> >       |         ^~~~~~~~~~~~
> > qemu/linux-user/syscall.c:4855:23: note: in definition of macro ‘IOCTL’
> >  4855 |     { TARGET_ ## cmd, cmd, #cmd, access, 0, {  __VA_ARGS__ } },
> >       |                       ^~~
> > 
> > Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
> > ---
> >  linux-user/syscall.c | 1 +
> >  1 file changed, 1 insertion(+)
> > 
> > diff --git a/linux-user/syscall.c b/linux-user/syscall.c
> > index b187c1281d..f13e260b02 100644
> > --- a/linux-user/syscall.c
> > +++ b/linux-user/syscall.c
> > @@ -37,6 +37,7 @@
> >  #include <sched.h>
> >  #include <sys/timex.h>
> >  #include <sys/socket.h>
> > +#include <linux/sockios.h>
> >  #include <sys/un.h>
> >  #include <sys/uio.h>
> >  #include <poll.h>
> > 
> 
> We already had a patch for that:
> 
> https://patchew.org/QEMU/20190604071915.288045-1-borntraeger@de.ibm.com/
> 
> but the value of SIOCGSTAMP depends on the size of struct timeval. The
> host part must be able to process SIOCGSTAMP_OLD and SIOCGSTAMP_NEW if
> it defines them.

I've sent a v2 that attempts to handle both struct sizes


Regards,
Daniel
-- 
|: https://berrange.com      -o-    https://www.flickr.com/photos/dberrange :|
|: https://libvirt.org         -o-            https://fstop138.berrange.com :|
|: https://entangle-photo.org    -o-    https://www.instagram.com/dberrange :|