Support exit status for exit/wait

One test case for returning a exit status
Passes usertests, but haven't used it to simplify tests

1 files changed, 2 insertions, 2 deletions

diff --git a/user/ls.c b/user/ls.c
index 5847555..b54d951 100644
--- a/user/ls.c
+++ b/user/ls.c
@@ -77,9 +77,9 @@ main(int argc, char *argv[])
 
   if(argc < 2){
     ls(".");
-    exit();
+    exit(0);
   }
   for(i=1; i<argc; i++)
     ls(argv[i]);
-  exit();
+  exit(0);
 }