[LTP] [PATCH] syscalls/shmctl05: Remove shm segment only when created

[xuyang2018.jy@fujitsu.com]

Hi Cyril
Thanks for this fix, merged.

Best Regards
Yang Xu
> We cannot remove the shm segment unconditionally. On kernels without
> SysV IPC support compiled in the test fails with following:
> 
> shmctl05.c:50: TCONF: syscall(396) __NR_shmctl not supported
> shmctl05.c:96: TWARN: shmget(61455, 4096, 0) failed: ENOENT (2)
> shmctl05.c:97: TWARN: shmctl(-1, 0, (nil)) failed: EINVAL (22)
> 
> Fixes: 48d382e8daf2 (syscalls/shmctl05.c: Fix leak of shared memory segment)
> Signed-off-by: Cyril Hrubis<chrubis@suse.cz>
> CC: Yang Xu<xuyang2018.jy@fujitsu.com>
> ---
>   testcases/kernel/syscalls/ipc/shmctl/shmctl05.c | 10 +++++++++-
>   1 file changed, 9 insertions(+), 1 deletion(-)
> 
> diff --git a/testcases/kernel/syscalls/ipc/shmctl/shmctl05.c b/testcases/kernel/syscalls/ipc/shmctl/shmctl05.c
> index ea7eef6f1..8569322dc 100644
> --- a/testcases/kernel/syscalls/ipc/shmctl/shmctl05.c
> +++ b/testcases/kernel/syscalls/ipc/shmctl/shmctl05.c
> @@ -92,8 +92,16 @@ static void do_test(void)
>   static void cleanup(void)
>   {
>   	int id;
> +
>   	tst_fzsync_pair_cleanup(&fzsync_pair);
> -	id = SAFE_SHMGET(0xF00F, 4096, 0);
> +
> +	id = shmget(0xF00F, 4096, 0);
> +	if (id == -1) {
> +		if (errno != ENOENT)
> +			tst_res(TWARN | TERRNO, "shmget()");
> +		return;
> +	}
> +
>   	SAFE_SHMCTL(id, IPC_RMID, NULL);
>   }
>