1/* Copyright (c) International Business Machines  Corp., 2009
2 * Author: Matt Helsley <matthltc@us.ibm.com>
3 *
4 * This library is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public
6 * License as published by the Free Software Foundation; either
7 * version 2.1 of the License, or (at your option) any later version.
8 *
9 * This library is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
12 * Lesser General Public License for more details.
13 *
14 * You should have received a copy of the GNU Lesser General Public
15 * License along with this library; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
17 */
18#include <stdio.h>
19#include <stdlib.h>
20#include <string.h>
21#include <errno.h>
22
23#include <sys/time.h>
24#include <sys/wait.h>
25#include <time.h>
26#include <unistd.h>
27#include <signal.h>
28
29int main(int argc, char **argv)
30{
31	struct timeval start, now;
32	pid_t child_root;
33	unsigned int duration = 1, num_tasks = 0;
34
35	if (argc > 1) {
36		int i;
37
38		for (i = 0; i < argc; i++) {
39			if (strcmp(argv[i], "--help") == 0) {
40				printf("%s [duration]\n", argv[0]);
41				exit(EXIT_SUCCESS);
42			}
43
44			if (sscanf(argv[i], "%u", &duration) == 1) {
45				printf("%u second duration\n", duration);
46				break;
47			}
48		}
49	}
50
51	/*
52	 * Wait until we're told to go. This allows the driver script to
53	 * configure the test system (e.g. by putting this task in a
54	 * suitable cgroup) before the timed forkbomb begins.
55	 */
56	{
57		char *word;
58		while (scanf("%as", &word) < 1) {
59		}
60		free(word);
61	}
62	if (gettimeofday(&start, NULL))
63		exit(EXIT_FAILURE);
64	child_root = fork();
65	if (child_root == -1)
66		exit(EXIT_FAILURE);
67/*	if (child_root == 0)
68		signal(SIGCHLD, SIG_IGN);*/
69	do {
70		if (child_root == 0) {
71/*			signal(SIGCHLD, SIG_IGN);*/
72			if (fork() == -1)
73				break;
74		} else {
75			if (wait(NULL) > 0)
76				num_tasks++;
77		}
78		if (gettimeofday(&now, NULL) && (errno != EINTR))
79			break;
80	} while ((now.tv_sec - start.tv_sec) <= duration);
81
82	if (child_root != 0)
83		printf("Forked %d tasks\n", num_tasks);
84	exit(EXIT_SUCCESS);
85}
86