On Mon, Mar 16, 2020 at 05:24:52PM -0700, Martin KaFai Lau wrote:

On Mon, Mar 16, 2020 at 11:54:28AM +0000, Quentin Monnet wrote:

quoted

[...]

quoted

+static int do_unregister(int argc, char **argv)
+{
+	const char *search_type, *search_term;
+	struct res res;
+
+	if (argc != 2)
+		usage();

Or you could reuse the macros in main.h, for more consistency with other
subcommands:

	if (!REQ_ARGS(2))
		return -1;

Thanks for the review!

I prefer to print out "usage();" whenever possible but then "-j" gave
me a 'null' after a json error mesage ...

# bpftool -j struct_ops unregister
{"error":"'unregister' needs at least 2 arguments, 0 found"},null

Then I went without REQ_ARGS(2) which is similar to a few existing
cases like do_dump(), do_updaate()...etc in map.c.

That was my consideration.  However, I can go back to use REQ_ARGS(2)
and return -1 without printing usage.  no strong preference here.

After another look,  I will keep it as is since REQ_ARGS() is a "<"
check.  "argc != 2" is the correct check here.  Otherwise,
allowing 'bpftool struct_ops unregister name cubic dctcp' looks weird.