Add explanatory comments to userprog tests.

[pintos-anon] / src / tests / userprog / close-stdin.c

diff --git a/src/tests/userprog/close-stdin.c b/src/tests/userprog/close-stdin.c
index 0b64ef9a774ad95621efb893717aa750b7840632..9bbf9f2fd282d207973f68c0d2ffe2b4c87757df 100644 (file)
--- a/src/tests/userprog/close-stdin.c
+++ b/src/tests/userprog/close-stdin.c
@@ -1,3 +1,6 @@
+/* Tries to close the keyboard input stream, which must either
+   fail silently or terminate with exit code -1. */
+
 #include <syscall.h>
 #include "tests/main.h"