killsnoop-nd.stp

#!/usr/bin/stap
/*
 * killsnoop-nd.stp	Trace process signals.
 *			For Linux, uses SystemTap (non-debuginfo).
 *
 * Copyright (C) 2015 Brendan Gregg.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * 24-Jun-2014	Brendan Gregg	Created this.
 */

global target;
global signal;

probe begin
{
	printf("%-6s %-12s %-5s %-6s %6s\n", "FROM", "COMMAND", "SIG", "TO",
	    "RESULT");
}

probe nd_syscall.kill
{
	/*
	 * I could use the @entry shortcut on the return probe instead, but
	 * wanted a full example of using global arrays directly.
	 */
	target[tid()] = uint_arg(1);
	signal[tid()] = uint_arg(2);
}

probe nd_syscall.kill.return
{
	if (target[tid()] != 0) {
		printf("%-6d %-12s %-5d %-6d %6d\n", pid(), execname(),
		    signal[tid()], target[tid()], int_arg(1));
		delete target[tid()];
		delete signal[tid()];
	}
}