Function getrlimit 

#[unsafe(no_mangle)]
pub unsafe extern "C" fn getrlimit(
    resource: c_int,
    rlp: *mut rlimit,
) -> c_int

See https://pubs.opengroup.org/onlinepubs/9799919799/functions/getrlimit.html.

Stores the value of the limit indicated by resource into the rlimit struct pointed to by rlp.

A return value of 0 indicates success, -1 indicates error.