@@ -965,12 +965,16 @@
 - (nullable OFString *)tryReadTillDelimiter: (OFString *)delimiter
 				   encoding: (OFStringEncoding)encoding;
 
 /**
  * @brief Writes everything in the write buffer to the stream.
+ *
+ * @return Whether the write buffer was flushed entirely. On non-blocking
+ *	   sockets, this can return `false` if flushing the write buffer in its
+ *	   entirety would block.
  */
-- (void)flushWriteBuffer;
+- (bool)flushWriteBuffer;
 
 /**
  * @brief Writes from a buffer into the stream.
  *
  * In non-blocking mode, if less than the specified length could be written, an