X-Git-Url: http://git.ozlabs.org/?p=ccan;a=blobdiff_plain;f=ccan%2Fio%2Fio.h;h=6553e7ab29b93de5bc1bd5118f63745f81b5279b;hp=8199bda9802050f747440f66ec1da97f987fcb47;hb=7bfb7a1cf4f7c5eaf4081ef7128b7fc7d1cf926e;hpb=306b6b0e89957bc1f2faa0a9b30a8398d1f40dfc

diff --git a/ccan/io/io.h b/ccan/io/io.h
index 8199bda9..6553e7ab 100644
--- a/ccan/io/io.h
+++ b/ccan/io/io.h
@@ -38,6 +38,9 @@ struct io_plan {
 			const char *buf;
 			size_t *lenp;
 		} writepart;
+		struct {
+			int saved_errno;
+		} close;
 		struct {
 			void *p;
 			size_t len;
@@ -84,7 +87,8 @@ struct io_conn *io_new_conn_(int fd, struct io_plan plan);
  * @arg: the argument to @finish.
  *
  * @finish will be called when an I/O operation fails, or you call
- * io_close() on the connection.
+ * io_close() on the connection.  errno will be set to the value
+ * after the failed I/O, or at the call to io_close().
  */
 #define io_set_finish(conn, finish, arg)				\
 	io_set_finish_((conn),						\