release/src/router/busybox/util-linux/pivot_root.c

   1 /* vi: set sw=4 ts=4: */
   2 /*
   3  * pivot_root.c - Change root file system.  Based on util-linux 2.10s
   4  *
   5  * busyboxed by Evin Robertson
   6  * pivot_root syscall stubbed by Erik Andersen, so it will compile
   7  *     regardless of the kernel being used.
   8  *
   9  * Licensed under GPL version 2, see file LICENSE in this tarball for details.
  10  */
  11 #include "libbb.h"
  12
  13 extern int pivot_root(const char * new_root,const char * put_old);
  14
  15 int pivot_root_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
  16 int pivot_root_main(int argc, char **argv)
  17 {
  18         if (argc != 3)
  19                 bb_show_usage();
  20
  21         if (pivot_root(argv[1], argv[2]) < 0) {
  22                 /* prints "pivot_root: <strerror text>" */
  23                 bb_perror_nomsg_and_die();
  24         }
  25
  26         return EXIT_SUCCESS;
  27 }