- size_t size, written = 0;
- int ret;
-again:
- size = PARA_MIN(1024, len - written);
- ret = write(fd, buf + written, size);
- if (ret < 0)
- goto err_out;
- written += ret;
- if (written >= len)
- return written;
- ret = write_ok(fd);
- if (ret > 0)
- goto again;
-err_out:
- return -E_DCCP_WRITE;
+ size_t written = 0;
+ int ret = 0;
+
+ while (written < len) {
+ ret = write(fd, buf + written, PARA_MIN(1024, len - written));
+ /*
+ * Error handling: CCID3 has a sending wait queue which fills up and is
+ * emptied asynchronously. The EAGAIN case means that there is currently
+ * no space in the wait queue, but this can change at any moment and is
+ * thus not an error condition.
+ */
+ if (ret < 0 && errno == EAGAIN)
+ return written;
+ if (ret < 0) {
+ PARA_ERROR_LOG("%s\n", strerror(errno));
+ return -E_DCCP_WRITE;
+ }
+ written += ret;
+ }
+ return written;
+}
+
+static int queue_chunk_or_shutdown(struct dccp_client *dc, long unsigned chunk_num,
+ size_t sent)
+{
+ int ret = cq_enqueue(dc->cq, chunk_num, sent);
+ if (ret < 0) {
+ PARA_NOTICE_LOG("enqueue error\n");
+ dccp_shutdown_client(dc);
+ }
+ return ret;
+}
+
+static int send_queued_chunks(struct dccp_client *dc)
+{
+ struct queued_chunk *qc;
+ while ((qc = cq_peek(dc->cq))) {
+ char *buf;
+ size_t len;
+ int ret;
+ cq_get(qc, &buf, &len);
+ ret = dccp_write(dc->fd, buf, len);
+ if (ret < 0)
+ return ret;
+ cq_update(dc->cq, ret);
+ if (ret != len)
+ return 1;
+ cq_dequeue(dc->cq);
+ }
+ return 1;