[LTP] [PATCH 2/2] syscalls: shift to time() if __NR_time not support

[Yang Xu <xuyang2018.jy@cn.fujitsu.com>]

Hi Li

I have seen this patchset, Can we use a function to check whether kernel 
supports time syscall (like time_supported_by_kernel()) in setup
and then we use time() - !return value in verify funtion?
> On some platforms(aarch64) __NR_time is not supported, if that happens,
> go back to invoke time() and relax 1-second in low bound for comparing.
>
> This also to fix:
>    TFAIL: msg_stime = 1605730573 out of [1605730574, 1605730574]
>
> Signed-off-by: Li Wang<liwang@redhat.com>
> Cc: Chunyu Hu<chuhu@redhat.com>
> Cc: Cyril Hrubis<chrubis@suse.cz>
> ---
>   testcases/kernel/syscalls/ipc/msgrcv/msgrcv01.c | 14 ++++++++++++--
>   testcases/kernel/syscalls/ipc/msgsnd/msgsnd01.c | 14 ++++++++++++--
>   testcases/kernel/syscalls/ipc/shmctl/shmctl01.c | 14 ++++++++++++--
>   3 files changed, 36 insertions(+), 6 deletions(-)
>
> diff --git a/testcases/kernel/syscalls/ipc/msgrcv/msgrcv01.c b/testcases/kernel/syscalls/ipc/msgrcv/msgrcv01.c
> index 6fdc47dc3..9dc778ca7 100644
> --- a/testcases/kernel/syscalls/ipc/msgrcv/msgrcv01.c
> +++ b/testcases/kernel/syscalls/ipc/msgrcv/msgrcv01.c
> @@ -26,13 +26,23 @@ static void verify_msgrcv(void)
>
>   	SAFE_MSGSND(queue_id,&snd_buf, MSGSIZE, 0);
>
> -	tst_syscall(__NR_time,&before_rcv);
> +	before_rcv = syscall(__NR_time, NULL);
> +	if (before_rcv == -1&&  errno == ENOSYS) {
> +		tst_res(TINFO, "__NR_time not supported");
> +		before_rcv = time(NULL) - 1;
> +	}
> +
>   	TEST(msgrcv(queue_id,&rcv_buf, MSGSIZE, 1, 0));
>   	if (TST_RET == -1) {
>   		tst_res(TFAIL | TTERRNO, "msgrcv failed");
>   		return;
>   	}
> -	tst_syscall(__NR_time,&after_rcv);
> +
> +	after_rcv = syscall(__NR_time, NULL);
> +	if (after_rcv == -1&&  errno == ENOSYS) {
> +		tst_res(TINFO, "__NR_time not supported");
> +		after_rcv = time(NULL);
> +	}
>
>   	if (strcmp(rcv_buf.mtext, snd_buf.mtext) == 0)
>   		tst_res(TPASS, "message received(%s) = message sent(%s)",
> diff --git a/testcases/kernel/syscalls/ipc/msgsnd/msgsnd01.c b/testcases/kernel/syscalls/ipc/msgsnd/msgsnd01.c
> index 9101f2668..27464e79f 100644
> --- a/testcases/kernel/syscalls/ipc/msgsnd/msgsnd01.c
> +++ b/testcases/kernel/syscalls/ipc/msgsnd/msgsnd01.c
> @@ -30,13 +30,23 @@ static void verify_msgsnd(void)
>   	struct msqid_ds qs_buf;
>   	time_t before_snd, after_snd;
>
> -	tst_syscall(__NR_time,&before_snd);
> +	before_snd = syscall(__NR_time, NULL);
> +	if (before_snd == -1&&  errno == ENOSYS) {
> +		tst_res(TINFO, "__NR_time not supported");
> +		before_snd = time(NULL) - 1;
> +	}
> +
>   	TEST(msgsnd(queue_id,&snd_buf, MSGSIZE, 0));
>   	if (TST_RET == -1) {
>   		tst_res(TFAIL | TTERRNO, "msgsnd() failed");
>   		return;
>   	}
> -	tst_syscall(__NR_time,&after_snd);
> +
> +	after_snd = syscall(__NR_time, NULL);
> +	if (after_snd == -1&&  errno == ENOSYS) {
> +		tst_res(TINFO, "__NR_time not supported");
> +		after_snd = time(NULL);
> +	}
>
>   	SAFE_MSGCTL(queue_id, IPC_STAT,&qs_buf);
>
> diff --git a/testcases/kernel/syscalls/ipc/shmctl/shmctl01.c b/testcases/kernel/syscalls/ipc/shmctl/shmctl01.c
> index f5b8eaef9..356513726 100644
> --- a/testcases/kernel/syscalls/ipc/shmctl/shmctl01.c
> +++ b/testcases/kernel/syscalls/ipc/shmctl/shmctl01.c
> @@ -241,9 +241,19 @@ static int get_shm_idx_from_id(int shm_id)
>
>   static void setup(void)
>   {
> -	ctime_min = tst_syscall(__NR_time, NULL);
> +	ctime_min = syscall(__NR_time, NULL);
> +	if (ctime_min == -1&&  errno == ENOSYS) {
> +		tst_res(TINFO, "__NR_time not supported");
> +		ctime_min = time(NULL) - 1;
> +	}
> +
>   	shm_id = SAFE_SHMGET(IPC_PRIVATE, SHM_SIZE, IPC_CREAT | SHM_RW);
> -	ctime_max = tst_syscall(__NR_time, NULL);
> +
> +	ctime_max = syscall(__NR_time, NULL);
> +	if (ctime_max == -1&&  errno == ENOSYS) {
> +		tst_res(TINFO, "__NR_time not supported");
> +		ctime_max = time(NULL);
> +	}
>
>   	shm_idx = get_shm_idx_from_id(shm_id);
>