diff --git a/lib/network.h b/lib/network.h
index 589b80e..9333ef8 100644
--- a/lib/network.h
+++ b/lib/network.h
@@ -33,4 +33,8 @@
    -1 on error. */
 extern int set_nonblocking(int fd);
 
+/* Does the I/O error indicate that the operation should be retried later? */
+#define ERRNO_IO_RETRY(EN) \
+	(((EN) == EAGAIN) || ((EN) == EWOULDBLOCK) || ((EN) == EINTR))
+
 #endif /* _ZEBRA_NETWORK_H */