Re: [PATCH bpf-next v11 2/9] selftests/bpf: Add ASSERT_OK_FD macro

[Martin KaFai Lau <martin.lau@linux.dev>]

On 7/9/24 2:16 AM, Geliang Tang wrote:
> From: Geliang Tang <tanggeliang@kylinos.cn>
> 
> Add a new dedicated ASSERT macro ASSERT_OK_FD to test whether a socket
> FD is valid or not. It can be used to replace macros ASSERT_GT(fd, 0, ""),
> ASSERT_NEQ(fd, -1, "") or statements (fd < 0), (fd != -1).
> 
> Suggested-by: Martin KaFai Lau <martin.lau@kernel.org>
> Signed-off-by: Geliang Tang <tanggeliang@kylinos.cn>
> ---
>   tools/testing/selftests/bpf/test_progs.h | 8 ++++++++
>   1 file changed, 8 insertions(+)
> 
> diff --git a/tools/testing/selftests/bpf/test_progs.h b/tools/testing/selftests/bpf/test_progs.h
> index 0ba5a20b19ba..4f7b91c25b1e 100644
> --- a/tools/testing/selftests/bpf/test_progs.h
> +++ b/tools/testing/selftests/bpf/test_progs.h
> @@ -377,6 +377,14 @@ int test__join_cgroup(const char *path);
>   	___ok;								\
>   })
>   
> +#define ASSERT_OK_FD(fd, name) ({					\
> +	static int duration = 0;					\
> +	int ___fd = (fd);						\
> +	bool ___ok = ___fd >= 0;					\
> +	CHECK(!___ok, (name), "unexpected fd: %d\n", ___fd);		\

printing errno should be useful.

> +	___ok;								\
> +})
> +
>   #define SYS(goto_label, fmt, ...)					\
>   	({								\
>   		char cmd[1024];						\