testcases/kernel/controllers/memcg/regression/memcg_test_4.c

/******************************************************************************/
/*                                                                            */
/* Copyright (c) 2009 FUJITSU LIMITED                                         */
/*                                                                            */
/* 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.                           */
/*                                                                            */
/* 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    */
/*                                                                            */
/* Author: Li Zefan <lizf@cn.fujitsu.com>                                     */
/*                                                                            */
/******************************************************************************/

#include <sys/mman.h>
#include <err.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <unistd.h>

#define MEM_SIZE	(1024 * 1024 * 100)

void sigusr_handler(int __attribute__((unused)) signo)
{
	char *p;

	p = mmap(NULL, MEM_SIZE, PROT_READ|PROT_WRITE,
	    MAP_PRIVATE|MAP_ANONYMOUS, 0, 0);
	if (p == MAP_FAILED) {
		err(1, "failed to allocate memory!");
	}

	memset(p, 'z', MEM_SIZE);
}

int main(void)
{
	struct sigaction sigusr_action;

	memset(&sigusr_action, 0, sizeof(sigusr_action));
	sigusr_action.sa_handler = &sigusr_handler;
	sigaction(SIGUSR1, &sigusr_action, NULL);

	while (1)
		sleep(1);

	return 0;
}