1/*
 2 * Copyright © 2020 Alexey Gladkov <gladkov.alexey@gmail.com>
 3 *
 4 * Permission to use, copy, modify, and distribute this software for any
 5 * purpose with or without fee is hereby granted, provided that the above
 6 * copyright notice and this permission notice appear in all copies.
 7 *
 8 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 9 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
15 */
16#include <assert.h>
17#include <stdlib.h>
18#include <stdio.h>
19#include <sys/mount.h>
20#include <sys/types.h>
21#include <sys/stat.h>
22
23int main(void)
24{
25	struct stat proc_st1, proc_st2;
26	char procbuff[] = "/tmp/proc.XXXXXX/meminfo";
27	char procdir1[] = "/tmp/proc.XXXXXX";
28	char procdir2[] = "/tmp/proc.XXXXXX";
29
30	assert(mkdtemp(procdir1) != NULL);
31	assert(mkdtemp(procdir2) != NULL);
32
33	assert(!mount("proc", procdir1, "proc", 0, "hidepid=1"));
34	assert(!mount("proc", procdir2, "proc", 0, "hidepid=2"));
35
36	snprintf(procbuff, sizeof(procbuff), "%s/meminfo", procdir1);
37	assert(!stat(procbuff, &proc_st1));
38
39	snprintf(procbuff, sizeof(procbuff), "%s/meminfo", procdir2);
40	assert(!stat(procbuff, &proc_st2));
41
42	umount(procdir1);
43	umount(procdir2);
44
45	assert(proc_st1.st_dev != proc_st2.st_dev);
46
47	return 0;
48}