Function raw_map_update_elem 

pub fn raw_map_update_elem<F: KernelAuxiliaryOps>(
    map: *mut c_void,
    key: *const c_void,
    value: *const c_void,
    flags: u64,
) -> i64

Update entry with key in map.

See https://docs.ebpf.io/linux/helper-function/bpf_map_update_elem/