make user able to append extra trace data. The way of logging backtrace is also changed.

lket_trace_extra() and lket_backtrace() are introduced for these two purpose.

I also modified lket.5.in for the backtrace changes

1 files changed, 1 insertions, 0 deletions

diff --git a/staptree.h b/staptree.h
index 583a877d..b2512054 100644
--- a/staptree.h
+++ b/staptree.h
@@ -261,6 +261,7 @@ struct print_format: public expression
 {
   bool print_with_format;
   bool print_to_stream;
+  bool lket_trace_extra;
 
   enum format_flag
     {