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

[Laurent Vivier <laurent@vivier.eu>]

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.

Thanks,
Laurent