From f9d352a64d125ac69c2d1a74fdbc75665c6d0b42 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Gustav=20S=C3=B6rn=C3=A4s?= <gustav@sornas.net>
Date: Thu, 4 Feb 2021 10:56:38 +0100
Subject: implement halt()

---
 src/userprog/syscall.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/userprog/syscall.c b/src/userprog/syscall.c
index e15555e..49e61e8 100644
--- a/src/userprog/syscall.c
+++ b/src/userprog/syscall.c
@@ -1,6 +1,7 @@
 #include "userprog/syscall.h"
 #include <stdio.h>
 #include <syscall-nr.h>
+#include "threads/init.h"
 #include "threads/interrupt.h"
 #include "threads/thread.h"
 
@@ -17,6 +18,10 @@ syscall_handler (struct intr_frame *f UNUSED)
 {
   int syscall_number = *((int *)f->esp);
   switch (syscall_number) {
+    case 0:
+      // halt
+      power_off ();
+      break;
     case 9:
       // printf
       printf ("printf: %s", *((char **)(f->esp+8)));
-- 
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