Merge branch 'lock' into thread

Conflicts:
	.gitignore
	Makefile
	conf/lab.mk

1 files changed, 3 insertions, 0 deletions

diff --git a/user/sh.c b/user/sh.c
index 836ebcb..5eceda0 100644
--- a/user/sh.c
+++ b/user/sh.c
@@ -165,6 +165,9 @@ main(void)
         fprintf(2, "cannot cd %s\n", buf+3);
       continue;
     }
+    if(buf[0] == 'e' && buf[1] == 'x' && buf[2] == 'i' && buf[3] == 't'){
+      exit(0);
+    }
     if(fork1() == 0)
       runcmd(parsecmd(buf));
     wait(0);