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 <shemminger@vyatta.com>
Acked-by: Arjan van de Ven <arjan@linux.intel.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
diff --git a/scripts/bootgraph.pl b/scripts/bootgraph.pl
index a8635a1..f0af9aa 100644
--- 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";