Function s2n_tls_sys::s2n_connection_append_protocol_preference

pub unsafe extern "C" fn s2n_connection_append_protocol_preference(
    conn: *mut s2n_connection,
    protocol: *const u8,
    protocol_len: u8
) -> c_int

Appends the provided application protocol to the preference list

The data provided in protocol parameter will be copied into an internal buffer

@param conn The connection object being updated @param protocol A pointer to a slice of bytes @param protocol_len The length of bytes that should be read from protocol. Note: this value cannot be 0, otherwise an error will be returned. @returns S2N_SUCCESS on success. S2N_FAILURE on failure