----- Original Message -----
> From: "Hangbin Liu" <liuhang...@gmail.com>
> To: "LTP List" <ltp-list@lists.sourceforge.net>
> Cc: "Jan Stancek" <jstan...@redhat.com>
> Sent: Wednesday, 1 July, 2015 7:34:42 AM
> Subject: [LTP][PATCHv2] containers: Use raw setns syscall for versions of
> glibc that don't include it
>
> The setns() system call was added to glibc in version 2.14. On systems with
> lower version glic, like RHEL6.6 glibc 2.12, ltp will build failed with
> error "userns04.c:58: undefined reference to `setns'". Use ltp_syscall to
> make
> build pass.
>
> Signed-off-by: Hangbin Liu <liuhang...@gmail.com>
> ---
> testcases/kernel/containers/userns/userns_helper.h | 10 ++++++++++
> 1 file changed, 10 insertions(+)
>
> diff --git a/testcases/kernel/containers/userns/userns_helper.h
> b/testcases/kernel/containers/userns/userns_helper.h
> index da03bae..21e5cb8 100644
> --- a/testcases/kernel/containers/userns/userns_helper.h
> +++ b/testcases/kernel/containers/userns/userns_helper.h
> @@ -15,6 +15,16 @@
> #include "test.h"
> #include "safe_macros.h"
>
> +/*
> + * Use raw setns syscall for versions of glibc that don't include it
> + */
> +#if __GLIBC__ <= 2 && __GLIBC_MINOR__ < 14
> +int setns(int fd, int nstype)
> +{
> + return ltp_syscall(__NR_setns, fd, nstype);
> +}
> +#endif
> +
What I had in mind was to replace setns calls with ltp_syscall(__NR_setns),
which would work with any libc library, not just glibc.
You also need this in setup():
ltp_syscall(__NR_setns, -1, 0);
because setns is used in child processes, so any tst_brkm call will end
the child and then parent will see that as unexpected failure.
Calling __NR_setns as first thing in setup() will immediately end
the test with TCONF if it's not supported. If it's supported the
syscall silently fails and test continues.
Regards,
Jan
> static int dummy_child(void *v)
> {
> (void) v;
> --
> 1.9.3
>
>
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