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 (at) 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 29 void 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 40 int 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