1 files changed, 33 insertions, 0 deletions
diff --git a/tapset/LKET/utils.stp b/tapset/LKET/utils.stp
new file mode 100755
index 00000000..0006246e
--- /dev/null
+++ b/tapset/LKET/utils.stp
@@ -0,0 +1,33 @@
+// Copyright (C) 2005, 2006 IBM Corp.
+//
+// This file is part of systemtap, and is free software.  You can
+// redistribute it and/or modify it under the terms of the GNU General
+// Public License (GPL); either version 2, or (at your option) any
+// later version.
+
+/* data tracing filter by pid
+   return:
+	1 - if continue to log the raw data
+	0 - return without logging the raw data
+ */
+function filter_by_pid:long()
+%{
+	struct task_struct *cur = current;
+
+	if(cur->tgid != _stp_pid)  {
+		/* to trace a specific process if we explicitly specify
+		   which process we want to trace by:
+		    1. stap -c "process_to_trace" ...
+		    2. stap -x pid_to_trace ...
+		   else we will trace all the processes
+		 */ 
+		if( _stp_target != 0 && cur->tgid != _stp_target) {
+			THIS->__retvalue = 0;
+			return;
+		}
+
+		THIS->__retvalue = 1;
+	} else  /*skip the events generated by stap itself*/
+		THIS->__retvalue = 0;
+	return;
+%}