SSL_CTX_set_alpn_select_cb
SSL_CTX_set_alpn_select_cb(ctx, alpn_cb, &alpn_ctx);
SSL_CTX_set_alpn_select_cb(ctx, select_alpn, NULL);
SSL_CTX_set_alpn_select_cb(ctx, select_alpn, NULL);
SSL_CTX_set_alpn_select_cb(ctx, select_alpn, NULL);
SSL_CTX_set_alpn_select_cb(ctx, select_alpn, NULL);
SSL_CTX_set_alpn_select_cb(ctx, select_alpn, NULL);
void SSL_CTX_set_alpn_select_cb(SSL_CTX *ctx,
SSL_CTX_set_alpn_select_cb(srv->ctx, alpn_select_cb, srv);
SSL_CTX_set_alpn_select_cb(server_ctx, server_alpn_cb, server_ctx_data);
SSL_CTX_set_alpn_select_cb(server2_ctx, server_alpn_cb,
SSL_CTX_set_alpn_select_cb(ctx, select_alpn, NULL);
SSL_CTX_set_alpn_select_cb(ssl_ctx, select_alpn, NULL);
SSL_CTX_set_alpn_select_cb(ctx, ssl_ctx_select_alpn, NULL);
SSL_CTX_set_alpn_select_cb(s_ctx, cb_server_alpn, alpn_server);
SSL_CTX_set_alpn_select_cb(s_ctx2, cb_server_alpn, alpn_server2);
SSL_CTX_set_alpn_select_cb(sctx, alpn_select_cb2, &idx);
SSL_CTX_set_alpn_select_cb(sctx, alpn_select_cb, NULL);
SSL_CTX_set_alpn_select_cb(sctx, alpn_select_cb, NULL);