| /* |
| * Copyright (c) 2000-2001 Silicon Graphics, Inc. |
| * All Rights Reserved. |
| * |
| * 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. |
| * |
| * This program is distributed in the hope that it would 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 the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
| */ |
| |
| /* |
| * |
| * usemem: allocate and lock a chunk of memory effectively removing |
| * it from the usable physical memory range |
| * |
| * - dxm 04/10/00 |
| */ |
| |
| #include <stdio.h> |
| #include <malloc.h> |
| #include <sys/mman.h> |
| #include <stdlib.h> |
| #include <sys/types.h> |
| #include <sys/wait.h> |
| #include <signal.h> |
| #include <unistd.h> |
| |
| void |
| usage(char *argv0) |
| { |
| fprintf(stderr,"Usage: %s <mb>\n", argv0); |
| exit(1); |
| } |
| |
| static void |
| signalled(int sig) |
| { |
| printf("*** signal\n"); |
| } |
| |
| int |
| main(int argc, char *argv[]) |
| { |
| int mb; |
| char *buf; |
| |
| if (argc!=2) usage(argv[0]); |
| mb=atoi(argv[1]); |
| if (mb<=0) usage(argv[0]); |
| |
| buf=malloc(mb*1024*1024); |
| if (!buf) { |
| perror("malloc"); |
| exit(1); |
| } |
| if (mlock(buf,mb*1024*1024)) { |
| perror("mlock"); |
| exit(1); |
| } |
| |
| printf("%s: %d mb locked - interrupt to release\n", argv[0], mb); |
| signal(SIGINT, signalled); |
| pause(); |
| printf("%s: %d mb unlocked\n", argv[0], mb); |
| |
| return 0; |
| } |
| |
| |