+ /* Get filter expression from client. */
+ if (cmd_ctx->lsm->u.enable.expression_len > 0) {
+ size_t expression_len =
+ cmd_ctx->lsm->u.enable.expression_len;
+
+ if (expression_len > LTTNG_FILTER_MAX_LEN) {
+ ret = LTTNG_ERR_FILTER_INVAL;
+ free(exclusion);
+ goto error;
+ }
+
+ filter_expression = zmalloc(expression_len);
+ if (!filter_expression) {
+ free(exclusion);
+ ret = LTTNG_ERR_FILTER_NOMEM;
+ goto error;
+ }
+
+ /* Receive var. len. data */
+ DBG("Receiving var len filter's expression from client ...");
+ ret = lttcomm_recv_unix_sock(sock, filter_expression,
+ expression_len);
+ if (ret <= 0) {
+ DBG("Nothing recv() from client car len data... continuing");
+ *sock_error = 1;
+ free(filter_expression);
+ free(exclusion);
+ ret = LTTNG_ERR_FILTER_INVAL;
+ goto error;
+ }
+ }
+