io: query whether io_plan in/out have started.

[ccan] / ccan / io / io.h

diff --git a/ccan/io/io.h b/ccan/io/io.h
index 1e4e80e7db779410b72a80428c65b12e8137218f..c9ab228c7a046b3c3575d0c1aa40d1255b15f5d7 100644 (file)
--- a/ccan/io/io.h
+++ b/ccan/io/io.h
@@ -674,6 +674,34 @@ void *io_loop(struct timers *timers, struct timer **expired);
  */
 int io_conn_fd(const struct io_conn *conn);
 
+/**
+ * io_plan_in_started - is this conn doing input I/O now?
+ * @conn: the conn.
+ *
+ * This returns true if input I/O has been performed on the conn but
+ * @next hasn't been called yet.  For example, io_read() may have done
+ * a partial read.
+ *
+ * This can be useful if we want to terminate a connection only after
+ * reading a whole packet: if this returns true, we would wait until
+ * @next is called.
+ */
+bool io_plan_in_started(const struct io_conn *conn);
+
+/**
+ * io_plan_out_started - is this conn doing output I/O now?
+ * @conn: the conn.
+ *
+ * This returns true if output I/O has been performed on the conn but
+ * @next hasn't been called yet.  For example, io_write() may have done
+ * a partial write.
+ *
+ * This can be useful if we want to terminate a connection only after
+ * writing a whole packet: if this returns true, we would wait until
+ * @next is called.
+ */
+bool io_plan_out_started(const struct io_conn *conn);
+
 /**
  * io_flush_sync - (synchronously) complete any outstanding output.
  * @conn: the connection.