State the purpose of CLEANUP macro

1 files changed, 4 insertions, 0 deletions

diff --git a/types.h b/types.h
index 47d115c..6c87105 100644
--- a/types.h
+++ b/types.h
@@ -21,6 +21,10 @@
 
 #include <stdbool.h>
 
+/*
+ * Annotation for functions called in cleanup().
+ * These functions are not allowed to call error(!0, ...) or exit().
+ */
 #define CLEANUP
 
 typedef enum {