tracing/fastboot: put error message on stderr

Stephen Hemminger · Ingo Molnar · commit d1aaf8cf8afe · 2008-11-13T19:58:22.000+01:00
Since this scripts output is usually redirected, put error messages
on standard error and exit with error code if no data is found.

Signed-off-by: Stephen Hemminger &lt;shemminger@vyatta.com&gt;
Acked-by: Arjan van de Ven &lt;arjan@linux.intel.com&gt;
Signed-off-by: Ingo Molnar &lt;mingo@elte.hu&gt;
diff --git a/scripts/bootgraph.pl b/scripts/bootgraph.pl
@@ -78,11 +78,13 @@
 }
 
 if ($count == 0) {
-	print "No data found in the dmesg. Make sure that 'printk.time=1' and\n";
-	print "'initcall_debug' are passed on the kernel command line.\n\n";
-	print "Usage: \n";
-	print "      dmesg | perl scripts/bootgraph.pl > output.svg\n\n";
-	exit;
+    print STDERR <<END;
+No data found in the dmesg. Make sure that 'printk.time=1' and
+'initcall_debug' are passed on the kernel command line.
+Usage:
+      dmesg | perl scripts/bootgraph.pl > output.svg
+END
+    exit 1;
 }
 
 print "<?xml version=\"1.0\" standalone=\"no\"?> \n";
