1 files changed, 10 insertions, 10 deletions

diff --git a/user/sh.c b/user/sh.c
index c573c99..74a493d 100644
--- a/user/sh.c
+++ b/user/sh.c
@@ -65,7 +65,7 @@ runcmd(struct cmd *cmd)
   struct redircmd *rcmd;
 
   if(cmd == 0)
-    exit();
+    exit(-1);
 
   switch(cmd->type){
   default:
@@ -74,7 +74,7 @@ runcmd(struct cmd *cmd)
   case EXEC:
     ecmd = (struct execcmd*)cmd;
     if(ecmd->argv[0] == 0)
-      exit();
+      exit(-1);
     exec(ecmd->argv[0], ecmd->argv);
     fprintf(2, "exec %s failed\n", ecmd->argv[0]);
     break;
@@ -84,7 +84,7 @@ runcmd(struct cmd *cmd)
     close(rcmd->fd);
     if(open(rcmd->file, rcmd->mode) < 0){
       fprintf(2, "open %s failed\n", rcmd->file);
-      exit();
+      exit(-1);
     }
     runcmd(rcmd->cmd);
     break;
@@ -93,7 +93,7 @@ runcmd(struct cmd *cmd)
     lcmd = (struct listcmd*)cmd;
     if(fork1() == 0)
       runcmd(lcmd->left);
-    wait();
+    wait(0);
     runcmd(lcmd->right);
     break;
 
@@ -117,8 +117,8 @@ runcmd(struct cmd *cmd)
     }
     close(p[0]);
     close(p[1]);
-    wait();
-    wait();
+    wait(0);
+    wait(0);
     break;
 
   case BACK:
@@ -127,7 +127,7 @@ runcmd(struct cmd *cmd)
       runcmd(bcmd->cmd);
     break;
   }
-  exit();
+  exit(0);
 }
 
 int
@@ -166,16 +166,16 @@ main(void)
     }
     if(fork1() == 0)
       runcmd(parsecmd(buf));
-    wait();
+    wait(0);
   }
-  exit();
+  exit(0);
 }
 
 void
 panic(char *s)
 {
   fprintf(2, "%s\n", s);
-  exit();
+  exit(-1);
 }
 
 int