| /* |
| * pivot_root.c - Change the root file system |
| * |
| * Copyright (C) 2000 Werner Almesberger |
| * |
| * This file is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; either version 2 of the License, or |
| * (at your option) any later version. |
| * |
| * This file is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| */ |
| #include <err.h> |
| #include <errno.h> |
| #include <getopt.h> |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <sys/syscall.h> |
| #include <unistd.h> |
| |
| #include "c.h" |
| #include "nls.h" |
| #include "closestream.h" |
| |
| #define pivot_root(new_root,put_old) syscall(SYS_pivot_root,new_root,put_old) |
| |
| static void __attribute__ ((__noreturn__)) usage(FILE * out) |
| { |
| fprintf(out, USAGE_HEADER); |
| fprintf(out, _(" %s [options] new_root put_old\n"), |
| program_invocation_short_name); |
| |
| fputs(USAGE_SEPARATOR, out); |
| fputs(_("Change the root filesystem.\n"), out); |
| |
| fprintf(out, USAGE_OPTIONS); |
| fprintf(out, USAGE_HELP); |
| fprintf(out, USAGE_VERSION); |
| fprintf(out, USAGE_MAN_TAIL("pivot_root(8)")); |
| exit(out == stderr ? EXIT_FAILURE : EXIT_SUCCESS); |
| } |
| |
| int main(int argc, char **argv) |
| { |
| int ch; |
| static const struct option longopts[] = { |
| {"version", no_argument, NULL, 'V'}, |
| {"help", no_argument, NULL, 'h'}, |
| {NULL, 0, NULL, 0} |
| }; |
| |
| setlocale(LC_ALL, ""); |
| bindtextdomain(PACKAGE, LOCALEDIR); |
| textdomain(PACKAGE); |
| atexit(close_stdout); |
| |
| while ((ch = getopt_long(argc, argv, "Vh", longopts, NULL)) != -1) |
| switch (ch) { |
| case 'V': |
| printf(UTIL_LINUX_VERSION); |
| return EXIT_SUCCESS; |
| case 'h': |
| usage(stdout); |
| default: |
| errtryhelp(EXIT_FAILURE); |
| } |
| |
| if (argc != 3) |
| usage(stderr); |
| |
| if (pivot_root(argv[1], argv[2]) < 0) |
| err(EXIT_FAILURE, _("failed to change root from `%s' to `%s'"), |
| argv[1], argv[2]); |
| |
| return EXIT_SUCCESS; |
| } |