+/**
+ * Force to add a chunk to the given queue.
+ *
+ * \param cq See \ref cq_enqueue.
+ * \param buf See \ref cq_enqueue.
+ * \param num_bytes See \ref cq_enqueue.
+ *
+ * If queuing the given buffer would result in exceeding the maximal queue
+ * size, buffers are dropped from the beginning of the queue. Note that this
+ * function still might fail.
+ *
+ * \return Standard.
+ */
+int cq_force_enqueue(struct chunk_queue *cq, const char *buf, size_t num_bytes)
+{
+ int ret;
+
+ if (num_bytes > cq->max_pending)
+ return -E_QUEUE;
+ for (;;) {
+ ret = cq_enqueue(cq, buf, num_bytes);
+ if (ret >= 0)
+ return ret;
+ cq_dequeue(cq);
+ }
+ /* never reached */
+}
+