Trace Linux signals

V-ati confruntat vreodata cu problema ca un proces aleatoriu ruleaza amok si ucide alte procese? Daca da, stii cât de greu este sa gasesti procesul. Exista insa o solutie pentru aceasta: sistem de control.

Trebuie doar sa scrieti un mic script stap ce va va arata procesul:

#!/usr/bin/stap
# sigkill.stp
# Copyright (C) 2007 Red Hat, Inc., Eugene Teo 
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 2 as
# published by the Free Software Foundation.
#
# /usr/share/systemtap/tapset/signal.stp:
# [...]
# probe signal.send = _signal.send.*
# {
# 	sig=$sig
# 	sig_name = _signal_name($sig)
# 	sig_pid = task_pid(task)
# 	pid_name = task_execname(task)
# [...]

probe signal.send {
  if (sig_name == "SIGKILL")
    printf("%s was sent to %s (pid:%d) by %s uid:%d\n",
           sig_name, pid_name, sig_pid, execname(), uid())
}

Executa apoi: stap sigkill.stp.