[LTP] [PATCH 2/2] Use SAFE_RUNCMD()

[Petr Vorel]

Hi Cyril,

...
> We already do have tst_get_path() that does more or less the same.
Thanks for info!

> Also if we are going to add this functionality it should be added as an
> .needs_cmds array in the tst_test structure.
.needs_cmds sounds as a good idea. But let's do it as a separate effort.
I'll leave already sent v2 for review. Once .needs_cmds is implemented, we can
use it as well for copy_file_range02.c.

BTW what do you think on changing 255 (and 254) for something less common?
It's just a corner case swapon on certain setup in copy_file_range02.c returns
255 on error:

Setting up swapspace version 1, size = 36 KiB (36864 bytes)
no label, UUID=bae78639-be0b-42b2-9e91-815b05f5751b
swapon: /tmp/msT4Ch/file_swap: swapon failed: Invalid argument
copy_file_range02.c:95: CONF: swapon binary not installed or failed

Kind regards,
Petr