diff --git a/include/errno.h b/include/errno.h
index c78dc0e..1f412f5 100644
--- a/include/errno.h
+++ b/include/errno.h
@@ -26,6 +26,8 @@ extern int errno;
 #define EISDIR       15   /* File descriptor is a directory. */
 #define ENOTDIR      16   /* File descriptor is not a directory. */
 #define ENOTEMPTY    17   /* Directory is not empty. */
+#define EINTR        18   /* Interrupted system call. */
+#define EAGAIN       19   /* Resource temporarily unavailable. */
 
 #ifdef __cplusplus
 }