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/*
* Copyright © 2020 Alexey Gladkov <gladkov.alexey@gmail.com>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <assert.h>
#include <stdlib.h>
#include <stdio.h>
#include <sys/mount.h>
#include <sys/types.h>
#include <sys/stat.h>
int main(void)
{
struct stat proc_st1, proc_st2;
char procbuff[] = "/tmp/proc.XXXXXX/meminfo";
char procdir1[] = "/tmp/proc.XXXXXX";
char procdir2[] = "/tmp/proc.XXXXXX";
assert(mkdtemp(procdir1) != NULL);
assert(mkdtemp(procdir2) != NULL);
assert(!mount("proc", procdir1, "proc", 0, "hidepid=1"));
assert(!mount("proc", procdir2, "proc", 0, "hidepid=2"));
snprintf(procbuff, sizeof(procbuff), "%s/meminfo", procdir1);
assert(!stat(procbuff, &proc_st1));
snprintf(procbuff, sizeof(procbuff), "%s/meminfo", procdir2);
assert(!stat(procbuff, &proc_st2));
umount(procdir1);
umount(procdir2);
assert(proc_st1.st_dev != proc_st2.st_dev);
return 0;
}
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