- size_t size, written = 0;
- int ret, retries = 0;
-again:
- size = PARA_MIN(1024, len - written);
- ret = write(fd, buf + written, size);
- if (ret < 0) {
- if (errno != EAGAIN || retries++ > DCCP_WRITE_RETRIES)
- goto err_out;
- PARA_DEBUG_LOG("EAGAIN #%d@%zd/%zd\n", retries, written, len);
- goto again;
+ 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. Keep polling until an entry becomes free.
+ */
+ if (ret < 0 && errno == EAGAIN)
+ continue;
+ if (ret < 0)
+ return -E_DCCP_WRITE;
+ written += ret;