add struct stat decl

diff --git a/user.h b/user.h
index c3ee675da2173e9d5f37445bcd955c5c349844bd..8280b2e2de69dcaf426aeb52f85a6a59a377caf4 100644 (file)
--- a/user.h
+++ b/user.h
@@ -1,3 +1,5 @@
+struct stat;
+
 // system calls
 int fork(void);
 int exit(void) __attribute__((noreturn));