1/******************************************************************************/ 2/* */ 3/* Copyright (c) 2009 FUJITSU LIMITED */ 4/* */ 5/* This program is free software; you can redistribute it and/or modify */ 6/* it under the terms of the GNU General Public License as published by */ 7/* the Free Software Foundation; either version 2 of the License, or */ 8/* (at your option) any later version. */ 9/* */ 10/* This program is distributed in the hope that it will be useful, */ 11/* but WITHOUT ANY WARRANTY; without even the implied warranty of */ 12/* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See */ 13/* the GNU General Public License for more details. */ 14/* */ 15/* You should have received a copy of the GNU General Public License */ 16/* along with this program; if not, write to the Free Software */ 17/* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ 18/* */ 19/* Author: Li Zefan <lizf@cn.fujitsu.com> */ 20/* */ 21/******************************************************************************/ 22 23#include <sys/mman.h> 24#include <signal.h> 25#include <stdlib.h> 26#include <string.h> 27#include <unistd.h> 28 29void sigusr_handler(int __attribute__ ((unused)) signo) 30{ 31 char *p; 32 int size = getpagesize() * 2; 33 34 p = mmap(NULL, size, PROT_READ | PROT_WRITE, 35 MAP_PRIVATE | MAP_ANONYMOUS | MAP_LOCKED, 0, 0); 36 if (p == MAP_FAILED) 37 exit(1); 38} 39 40int main(void) 41{ 42 struct sigaction sigusr_action; 43 44 memset(&sigusr_action, 0, sizeof(sigusr_action)); 45 sigusr_action.sa_handler = &sigusr_handler; 46 sigaction(SIGUSR1, &sigusr_action, NULL); 47 48 while (1) 49 sleep(1); 50 51 return 0; 52} 53