Function openssl_sys::SSL_CTX_set_next_proto_select_cb

pub unsafe extern fn SSL_CTX_set_next_proto_select_cb(ssl: *mut SSL_CTX,
                                                      cb: extern fn(ssl: *mut SSL, out: *mut *mut c_uchar, outlen: *mut c_uchar, inbuf: *const c_uchar, inlen: c_uint, arg: *mut c_void) -> c_int,
                                                      arg: *mut c_void)