Function nros_rmw_cffi_registered_names 

pub unsafe extern "C" fn nros_rmw_cffi_registered_names(
    buf: *mut *const c_char,
    cap: usize,
) -> usize

Diagnostic helper — fills buf with pointers to up to cap registered backend names. Returns the total number of registered backends (may exceed cap; caller can re-query with a larger buffer). Pointer-valid for the program’s lifetime. Pass buf=NULL, cap=0 to query the count only.