Function timespec_getres 

#[unsafe(no_mangle)]
pub unsafe extern "C" fn timespec_getres(
    res: *mut timespec,
    base: c_int,
) -> c_int

ISO C equivalent to Sys::clock_getres.

The main differences are that this function:

• returns 0 on error and base on success
• only mandates TIME_UTC as a base