[LTP] [PATCH] syscalls/shmctl: Using TERRNO to macth errno

[xuyang2018.jy@fujitsu.com <xuyang2018.jy@fujitsu.com>]

Hi Gongyi

> Hi Xu, Li,
>
> On the other hand, we have created a shm in setup, why we query with SHM_INFO and return 0?
Because SHM_INFO ignores shm_id parameter like IPC_INFO in kernel. We 
created a shm in setup just to make sure that there is at least one 
during the testrun.

>
> Best Regards,
> Gongyi
>
>> Hi Gongyi
>>
>> The SHM_STAT_ANY cmd was introduced since kernel 4.17. I guess we
>> should add check for it.
>>> Hi Li,
>>>
>>> Yes, I find the problem in my testing of qemu with kernel version 4.4
>>> and the config is vexpress_defconfig.
>>>
>>> Specifically as follow:
>>>
>>> tst_test.c:1294: TINFO: Timeout per run is 0h 05m 00s
>>>
>>> shmctl04.c:119: TINFO: Test SHM_STAT_ANY with nobody user
>>>
>>> TST_RET: 0 SHM_STAT_ANY: 15
>>>
>>> shmctl04.c:134: TFAIL: SHM_INFO haven't returned a valid index: EINVAL
>>> (22)
>>>
>>> shmctl04.c:150: TFAIL: Counted used = 0, used_ids = 1
>>>
>>> shmctl04.c:85: TPASS: used_ids = 1
>>>
>>> shmctl04.c:92: TPASS: shm_rss = 0
>>>
>>> shmctl04.c:99: TPASS: shm_swp = 0
>>>
>>> shmctl04.c:106: TPASS: shm_tot = 1
>>>
>>> shmctl04.c:119: TINFO: Test SHM_STAT_ANY with root user
>>>
>>> TST_RET: 0 SHM_STAT_ANY: 15
>>>
>>> shmctl04.c:134: TFAIL: SHM_INFO haven't returned a valid index: EINVAL
>>> (22)
>>>
>>> shmctl04.c:150: TFAIL: Counted used = 0, used_ids = 1
>>>
>>> shmctl04.c:85: TPASS: used_ids = 1
>>>
>>> shmctl04.c:92: TPASS: shm_rss = 0
>>>
>>> shmctl04.c:99: TPASS: shm_swp = 0
>>>
>>> shmctl04.c:106: TPASS: shm_tot = 1
>>>
>>> Summary:
>>>
>>> passed   8
>>>
>>> failed   4
>>>
>>> broken   0
>>>
>>> skipped  0
>>>
>>> warnings 0
>>>