So the problem arises because the headers we have in userspace might
be older and not match what we have in the kernel. In that case, the
actual value of AF_MAX in the userspace headers might be a valid
protocol family in the new kernel.
That happens relatively often for us because we support different
kernel versions at the same time in a given Ubuntu series.
An alternative is to use the headers we have in the kernel tree, but I
believe that might cause other issues.
On Mon, Sep 16, 2019 at 10:09:13AM -0600, shuah wrote:
> On 9/16/19 9:03 AM, Marcelo Henrique Cerri wrote:
> > Use INT_MAX instead of AF_MAX, since libc might have a smaller value
> > of AF_MAX than the kernel, what causes the test to fail.
> >
> > Signed-off-by: Marcelo Henrique Cerri <marcelo.cerri@xxxxxxxxxxxxx>
> > ---
> > tools/testing/selftests/net/socket.c | 6 +++++-
> > 1 file changed, 5 insertions(+), 1 deletion(-)
> >
> > diff --git a/tools/testing/selftests/net/socket.c b/tools/testing/selftests/net/socket.c
> > index afca1ead677f..10e75ba90124 100644
> > --- a/tools/testing/selftests/net/socket.c
> > +++ b/tools/testing/selftests/net/socket.c
> > @@ -6,6 +6,7 @@
> > #include <sys/types.h>
> > #include <sys/socket.h>
> > #include <netinet/in.h>
> > +#include <limits.h>
> > struct socket_testcase {
> > int domain;
> > @@ -24,7 +25,10 @@ struct socket_testcase {
> > };
> > static struct socket_testcase tests[] = {
> > - { AF_MAX, 0, 0, -EAFNOSUPPORT, 0 },
> > + /* libc might have a smaller value of AF_MAX than the kernel
> > + * actually supports, so use INT_MAX instead.
> > + */
> > + { INT_MAX, 0, 0, -EAFNOSUPPORT, 0 },
> > { AF_INET, SOCK_STREAM, IPPROTO_TCP, 0, 1 },
> > { AF_INET, SOCK_DGRAM, IPPROTO_TCP, -EPROTONOSUPPORT, 1 },
> > { AF_INET, SOCK_DGRAM, IPPROTO_UDP, 0, 1 },
> >
>
> What failure are you seeing? It sounds arbitrary to use INT_MAX
> instead of AF_MAX. I think it is important to understand the
> failure first.
>
> Please note that AF_MAX is widely used in the kernel.
>
> thanks,
> -- Shuah
--
Regards,
Marcelo
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