blob: 2671016ed87473dacd9df5c41270d126abdb46a5 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
|
// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (c) 2000-2001 Silicon Graphics, Inc.
* All Rights Reserved.
*/
/*
*
* 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;
}
|
