[LTP] [PATCH RFC] lib: add helper funcs to save and restore /proc|sys content

[Cyril Hrubis <chrubis@suse.cz>]

Hi!
> To avoid adding specially crafted functions for every feature
> where we need to save/restore some proc/sys config, this patch
> introduces a struct (linked list) where user pushes files names
> whose values should be saved. These can be later restored in
> cleanup or during the test.

This is a great idea, but I guess that the user API could be even more
simplified.

I would go for an NULL terminated array of strings that could be passed
in the tst_test structure. Also that way the values would be restored in the
test library even after the test has crashed.

Something as:

static const char *save_restore[] = {
	"/proc/sys/kernel/core_pattern",
	"/proc/sys/kernel/numa_balancing",
	NULL,
};


static struct tst_test test = {
	...

	.save_restore = save_restore,
};

What do you think?

-- 
Cyril Hrubis
chrubis@suse.cz