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/*
Copyright 2010,2011 ulatencyd developers
This file is part of ulatencyd.
ulatencyd 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 3 of the License,
or (at your option) any later version.
ulatencyd 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.
You should have received a copy of the GNU General Public License
along with ulatencyd. If not, see http://www.gnu.org/licenses/.
*/
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <stdio.h>
#include <getopt.h>
#include <string.h>
#include <unistd.h>
int
main (argc, argv)
int argc;
char **argv;
{
int c = 0;
int i = 0;
int nums = 2000;
int delay = 50000;
int work = 0;
int rand = open("/dev/urandom",O_RDONLY);
int data[2];
int tmpi = 0;
pid_t pid;
while (1)
{
int option_index = 0;
static struct option long_options[] =
{
{"nums", 1, 0, 'n'},
{"delay", 1, 0, 'd'},
{"work", 0, 0, 'w'},
{"help", 0, 0, 'h'},
{0, 0, 0, 0}
};
c = getopt_long (argc, argv, "n:c:hd:",
long_options, &option_index);
if (c == -1)
break;
switch (c)
{
case 0:
printf ("option %s", long_options[option_index].name);
if (optarg)
printf (" with arg %s", optarg);
printf ("\n");
break;
case 'h':
printf ("forkbomb:\n");
printf ("-n num number of forks to create\n");
printf ("-d delay delay in usecs between alloc \n");
exit(0);
break;
case 'n':
nums = atoi(optarg);
break;
case 'w':
work = 1;
break;
case 'd':
delay = atoi(optarg);
break;
case '?':
break;
default:
printf ("?? getopt returned character code 0%o ??\n", c);
}
}
if (optind < argc)
{
printf ("non-option ARGV-elements: ");
while (optind < argc)
printf ("%s ", argv[optind++]);
printf ("\n");
}
printf(
"!!!!!!!!!!!!!!!!!!!!!!!! WARNING !!!!!!!!!!!!!!!!!!!!!!!!\n"
"!!!!! THIS PROGRAM WILL LIKELY KILL YOUR COMPUTER !!!!!\n"
"!!!!! ulatency may rescue you ;-) !!!!!\n"
"!!!!! press ctrl+c to stop !!!!!\n"
"!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!\n"
);
sleep(3);
printf ("fork %d childs %s (delay %d us)e:\n", nums, work ? "working" : "", delay);
while(1) {
if(i < nums) {
pid = fork();
if(pid < 0) {
printf("can't fork\n");
}
if(pid == 0) {
printf(".");
fflush(stdout);
if(work) {
read(rand, &data, sizeof(int)*2);
if(data[1] != 0) {
tmpi += data[0]/data[1];
}
} else {
sleep(10000);
}
}
i++;
}
usleep(delay);
}
exit (0);
}
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