tracing/fastboot: put error message on stderr

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 <[email protected]> Acked-by: Arjan van de Ven <[email protected]> Signed-off-by: Ingo Molnar <[email protected]>
chewitt · Nov 13, 2008 · d1aaf8c · d1aaf8c
1 parent 24de386
commit d1aaf8c
Showing 1 changed file with 7 additions and 5 deletions.
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";