/* * 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; }