Function netif_get_opt

pub unsafe extern "C" fn netif_get_opt(
    netif: *const netif_t,
    opt: netopt_t,
    context: u16,
    value: *mut c_void,
    max_len: size_t,
) -> c_int

@brief Gets option from an interface

@note Supposed to be implemented by the networking module

@param[in] netif A network interface. @param[in] opt Option type. @param[in] context (Optional) context to the given option @param[out] value Pointer to store the option’s value in. @param[in] max_len Maximal amount of byte that fit into @p value.

@return Number of bytes written to @p value. @return < 0 on error, 0 on success.