On Mon, 19 Apr 2021 07:50:02 +0300
Tzvetomir Stoyanov <tz.stoyanov@xxxxxxxxx> wrote:
> The libtracefs options APIs can be used, instead of walking through
> the directory:
No it can't! And this just confirms my fears about using the option mask
and not actually looking at what is on the system. We need a way to see
what's on the system and not just what libtracefs knows about.
>
> struct tracefs_options_mask *all = tracefs_options_get_supported(NULL);
> struct tracefs_options_mask *enabled = tracefs_options_get_enabled(NULL);
> char *name;
>
> for (int i = 1; i < TRACEFS_OPTION_MAX; i++) {
> if (!tracefs_option_mask_is_set(all, i))
> continue;
> name = tracefs_option_name(i);
> if (!tracefs_option_mask_is_set(enabled, i))
> printf("%s\n", name);
> else
> printf("no%s\n", name);
> }
The reason I wrote this was to test the func-no-repeat option that Yordan
wrote, and was sick of going to the /sys/kernel/tracing directory and doing
it by hand.
I want to know what the kernel supports, not what libtracefs supports!
-- Steve
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