[LTP] [PATCH] syscalls: rt_sigwaitinfo01: Fix failure for MIPS arches

[Jan Stancek <jstancek@redhat.com>]

----- Original Message -----
> From: He Zhe <zhe.he@windriver.com>
> 
> rt_sigtimedwait01 fails as follow on MIPS arches
> rt_sigtimedwait01    1  TFAIL  :  .../sigwaitinfo01.c:58: test_empty_set
> (.../sigwaitinfo01.c: 148): Unexpected failure:
> TEST_ERRNO=EINVAL(22): Invalid argument
> 
> As this case purposely bypasses glibc, it should align with the size of
> kernel
> definition of sigset_t which is different from other arches.
> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/arch/mips/include/uapi/asm/signal.h#n15
> 
> This patch adds specific case for MIPS.
> 
> Signed-off-by: He Zhe <zhe.he@windriver.com>
> ---
>  testcases/kernel/syscalls/sigwaitinfo/sigwaitinfo01.c | 13 ++++++++++---
>  1 file changed, 10 insertions(+), 3 deletions(-)
> 
> diff --git a/testcases/kernel/syscalls/sigwaitinfo/sigwaitinfo01.c
> b/testcases/kernel/syscalls/sigwaitinfo/sigwaitinfo01.c
> index 5a32ce1..5c2fa99 100644
> --- a/testcases/kernel/syscalls/sigwaitinfo/sigwaitinfo01.c
> +++ b/testcases/kernel/syscalls/sigwaitinfo/sigwaitinfo01.c
> @@ -128,9 +128,16 @@ static int my_sigtimedwait(const sigset_t * set,
> siginfo_t * info,
>  static int my_rt_sigtimedwait(const sigset_t * set, siginfo_t * info,
>  			      struct timespec *timeout)
>  {
> -
> -	/* The last argument is (number_of_signals)/(bits_per_byte), which are 64
> and 8, resp. */
> -	return ltp_syscall(__NR_rt_sigtimedwait, set, info, timeout, 8);
> +	/* The last argument is (number_of_signals)/(bits_per_byte), which are 64
> and 8, resp,
> +	 * except for MIPS which are 128 and 8, resp.
> +	 */
> +	return ltp_syscall(__NR_rt_sigtimedwait, set, info, timeout,
> +#ifdef __mips__
> +		16
> +#else
> +		8
> +#endif

Hi,

looking at kernel SYSCALL_DEFINE4(rt_sigtimedwait,..), the size is
used in this check:
        if (sigsetsize != sizeof(sigset_t))                                                                                                                   
                return -EINVAL; 

So I'm wondering if need to have an absolute value here, and if we can't
replace it with sizeof(sigset_t) or _NSIG / 8?

Regards,
Jan