From d2c10b2a70e08c3d2a51c65de4b4510b9bb5921b Mon Sep 17 00:00:00 2001
From: "George V. Neville-Neil" <gnn@FreeBSD.org>
Date: Tue, 4 Sep 2012 20:14:37 +0000
Subject: [PATCH] Add a reasonable error message telling the caller to specify
 a program to be executed under hwpmc.  If there is no program to run then
 exit.

---
 tools/test/hwpmc/pmctest.py | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/tools/test/hwpmc/pmctest.py b/tools/test/hwpmc/pmctest.py
index e3c12d3ddd5..fb6667db8c0 100755
--- a/tools/test/hwpmc/pmctest.py
+++ b/tools/test/hwpmc/pmctest.py
@@ -67,6 +67,10 @@ def main():
 
     (options, args) = parser.parse_args()
 
+    if (options.program == None):
+        print "specify program, such as ls, with -p/--program"
+        sys.exit()
+        
     p = subprocess.Popen(["pmccontrol", "-L"], stdout=PIPE)
     counters = p.communicate()[0]