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Filename : pstrace.stp
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/*
 * 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;
}