/*
 *  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 Library General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 *
 *       $Id: memory-pressure.c,v 1.2 2012/01/25 19:39:01 james.stevenson Exp $
 *
 * Author:
 *       NAME:   James Stevenson
 *       WWW:    http://www.stev.org
 *
 */


#include <stdio.h>
#include <stdarg.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>

int verbose = 0;

void print_help(FILE *fp, char *app) {
	fprintf(fp, "Usage: %s <size in kb>\n", app);
	fprintf(fp, "\n");
	fprintf(fp, "\t-s	<secs>	Delay between touching memory\n");
	fprintf(fp, "\t-v		Be more verbose\n");
	fprintf(fp, "\n");
}

int main(int argc, char **argv) {
	int size = 0;
	char *buffer = 0;
	int c = 0;
	int delay = 1;

	while( (c = getopt(argc, argv, "s:v")) != -1) {
		switch(c) {
			case 's':
				delay = atoi(optarg);
				break;
			case 'v':
				verbose++;
				break;
			default:
				break;
		}
	}

	if (argc - optind < 1) {
		print_help(stdout, argv[0]);
		exit(EXIT_FAILURE);
	}

	size = atoi(argv[argc - 1]);

	buffer = malloc(size * 1024);

	if (!buffer) {
		perror("malloc");
		exit(EXIT_FAILURE);
	}

	while(1) {
		printf("Touching Memory\n");
		memset(buffer, 0, size * 1024);
		sleep(delay);
	}

	return 0;
}