1/* See LICENSE file for copyright and license details. */
 2
 3#include <sys/syscall.h>
 4
 5#include <stdio.h>
 6#include <stdlib.h>
 7#include <unistd.h>
 8
 9#include "util.h"
10
11static void
12usage(void)
13{
14  eprintf("usage: %s new-root put-old\n", argv0);
15}
16
17// ?man pivot_root: change the root filesystem
18// ?man arguments: new-root put-old
19// ?man change the root filesystem of the current process
20int
21main(int argc, char *argv[])
22{
23  ARGBEGIN
24  {
25    default:
26      usage();
27  }
28  ARGEND;
29
30  if (argc < 2)
31    usage();
32
33  if (syscall(SYS_pivot_root, argv[0], argv[1]) < 0)
34    eprintf("pivot_root:");
35
36  return 0;
37}