/usr/share/systemtap/tapset/linux/pstrace.stp is in systemtap-common 3.1-3ubuntu0.1.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 | /*
* kernel pstrace tapset
* Copyright (C) 2012 Red Hat Corporation.
*
* 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.
*/
/**
* sfunction pstrace - Chain of processes and pids back to init(1)
* @task: Pointer to task struct of process
*
* This function returns a string listing execname and pid for each
* process starting from @task back to the process ancestor
* that init(1) spawned.
*/
function pstrace:string(task:long)
{
while (task_pid(task) > 1) {
trace = sprintf("%s %s(%d)", trace, task_execname(task), task_pid(task));
task = task_parent(task);
}
return trace;
}
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