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// 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;
%}
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