[LTP] [PATCH] Add test case to cover the setting resource limit64 for process

[Andrea Cervesato]

Hi!

The whole test is a duplication of the setrlimit06, so it's better to 
work on that one and to introduce the 64bits support using 64bit test 
variant.

A couple of comments about the implementation:

- we are already defining the "struct rlimit64" inside getrlimit03, so 
we need to create a new file lapi/resource.h where we move that struct, 
checking if HAVE_STRUCT_RLIMIT64 is not defined. I guess the same should 
be done for getrlimit_u64()/setrlimit_u64() syscalls definitions. Better 
to move them in there in case we will need it in the future . We can 
skip SAFE_* variants at the moment, since we are not using them around 
LTP test for now.

- in both setrlimit06 and setrlimit07 we should probably use tst_buffers 
for safety reasons when passing the pointer to the rlimit/rlimit64 
struct we are gonna use

- it's worth to check if the other tests might introduce the same 64bit 
variants

FYI i noticed that setrlimit06 description can't be fetched in the 
metadata because it's not initialized with /*\ . It also needs to be 
changed into the RST format instead of asciidoc.

King regards,
Andrea Cervesato