Fix stupidity in last check-in.

diff --git a/src/utils/pintos b/src/utils/pintos
index 079ab5a34d22e8970a631203acdf6913e2a7a4fe..13d7e5436fbe77a79d18ac1d81b02083214fa8de 100755 (executable)
--- a/src/utils/pintos
+++ b/src/utils/pintos
@@ -703,7 +703,7 @@ sub xsystem {
            my ($boots) = 0;
            local ($|) = 1;
            for (;;) {
-               if (waitpid ($pid, WNOHANG) == 0) {
+               if (waitpid ($pid, WNOHANG) != 0) {
                    # Subprocess died.  Pass through any remaining data.
                    print $buf while sysread ($in, $buf, 4096) > 0;
                    last;
@@ -711,7 +711,8 @@ sub xsystem {
 
                # Read and print out pipe data.
                my ($len) = length ($buf);
-               last if sysread ($in, $buf, 4096, $len) <= 0;
+               waitpid ($pid, 0), last
+                 if sysread ($in, $buf, 4096, $len) <= 0;
                print substr ($buf, $len);
 
                # Remove full lines from $buf and scan them for keywords.
@@ -730,8 +731,9 @@ sub xsystem {
                    }
                }
            }
+       } else {
+           waitpid ($pid, 0);
        }
-       waitpid ($pid, 0);
        alarm (0);
        &$cleanup ();