[LTP] [PATCH] syscalls/epoll_create: Replace syscall to libc

[Cyril Hrubis]

Hi!
> For epoll_create01.c/epoll_create02.c, we should replace syscall to libc
> or the testcase will fail because of Syscall epoll_create is not support
> in some arches.

I guess that epoll_create() is emulated via epoll_create1() in these
cases right?

Does these testcases fail in these cases though? The __NR_epoll_create
should be set to -1 when the syscall is not supported and the test
should be skipped with TCONF.

The patch looks good, however it would be slightly better to add test
variants so that we call both the raw syscall, if available, and the
glibc wrapper, with something as:


static int do_epoll_create(int size)
{
	switch (tst_variant) {
	case 0:
		return tst_syscall(__NR_epoll_create, size);
	break;
	case 1:
		return epoll_create(size);
	break;
}

static void run(unsigned int n)
{
	TST_EXP_FD(do_epoll_create(tc[n]) ...);

	...
}

static void setup(void)
{
	switch (tst_variant) {
	case 0:
		tst_res(TINFO, "Testing variant: syscall __NR_epoll_create");
	break;
	case 1:
		tst_res(TINFO, "Testing variant: libc epoll_create()");
	break;
	}
}

static struct tst_test test = {
	...
	.test_variants = 2,
	...
};


> Signed-off-by: Zhao Gongyi <zhaogongyi@huawei.com>
> ---
>  testcases/kernel/syscalls/epoll_create/epoll_create01.c | 2 +-
>  testcases/kernel/syscalls/epoll_create/epoll_create02.c | 2 +-
>  2 files changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/testcases/kernel/syscalls/epoll_create/epoll_create01.c b/testcases/kernel/syscalls/epoll_create/epoll_create01.c
> index 3ef5b5cac..b6ebe9ad7 100644
> --- a/testcases/kernel/syscalls/epoll_create/epoll_create01.c
> +++ b/testcases/kernel/syscalls/epoll_create/epoll_create01.c
> @@ -24,7 +24,7 @@ static int tc[] = {1, INT_MAX};
> 
>  static void run(unsigned int n)
>  {
> -	TST_EXP_FD(tst_syscall(__NR_epoll_create, tc[n]), "epoll_create(%d)", tc[n]);
> +	TST_EXP_FD(epoll_create(tc[n]), "epoll_create(%d)", tc[n]);
> 
>  	if (!TST_PASS)
>  		return;
> diff --git a/testcases/kernel/syscalls/epoll_create/epoll_create02.c b/testcases/kernel/syscalls/epoll_create/epoll_create02.c
> index c59ea7944..e96228983 100644
> --- a/testcases/kernel/syscalls/epoll_create/epoll_create02.c
> +++ b/testcases/kernel/syscalls/epoll_create/epoll_create02.c
> @@ -27,7 +27,7 @@ static struct test_case_t {
> 
>  static void run(unsigned int n)
>  {
> -	TST_EXP_FAIL(tst_syscall(__NR_epoll_create, tc[n].size),
> +	TST_EXP_FAIL(epoll_create(tc[n].size),
>  		     tc[n].exp_err, "create(%d)", tc[n].size);
>  }
> 
> --
> 2.17.1
> 
> 
> -- 
> Mailing list info: https://lists.linux.it/listinfo/ltp

-- 
Cyril Hrubis
chrubis@suse.cz