From 463ae0abc3225d6e6de4a5a1ad57e64ab76b2b6f Mon Sep 17 00:00:00 2001
From: Robert Morris <rtm@csail.mit.edu>
Date: Fri, 9 Sep 2022 09:17:37 -0400
Subject: handle negative arguments to sleep() a little better

---
 kernel/sysproc.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/kernel/sysproc.c b/kernel/sysproc.c
index 1de184e..3b4d5bd 100644
--- a/kernel/sysproc.c
+++ b/kernel/sysproc.c
@@ -55,6 +55,8 @@ sys_sleep(void)
   uint ticks0;
 
   argint(0, &n);
+  if(n < 0)
+    n = 0;
   acquire(&tickslock);
   ticks0 = ticks;
   while(ticks - ticks0 < n){
-- 
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