/* * 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;}