From 6e3f75c2aa670bc0d47928cd48408b81e5bd758d Mon Sep 17 00:00:00 2001
From: Robert Morris <rtm@csail.mit.edu>
Date: Thu, 19 Nov 2020 16:48:41 -0500
Subject: [PATCH] suppress an incorrect error message in grind

---
 user/grind.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/user/grind.c b/user/grind.c
index 85899f5..5cd89f4 100644
--- a/user/grind.c
+++ b/user/grind.c
@@ -277,14 +277,15 @@ go(int which_child)
       close(aa[0]);
       close(aa[1]);
       close(bb[1]);
-      char buf[3] = { 0, 0, 0 };
+      char buf[4] = { 0, 0, 0, 0 };
       read(bb[0], buf+0, 1);
       read(bb[0], buf+1, 1);
+      read(bb[0], buf+2, 1);
       close(bb[0]);
       int st1, st2;
       wait(&st1);
       wait(&st2);
-      if(st1 != 0 || st2 != 0 || strcmp(buf, "hi") != 0){
+      if(st1 != 0 || st2 != 0 || strcmp(buf, "hi\n") != 0){
         printf("grind: exec pipeline failed %d %d \"%s\"\n", st1, st2, buf);
         exit(1);
       }