usr/src/cmd/chroot/chroot.c

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License, Version 1.0 only
   6  * (the "License").  You may not use this file except in compliance
   7  * with the License.
   8  *
   9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
  10  * or http://www.opensolaris.org/os/licensing.
  11  * See the License for the specific language governing permissions
  12  * and limitations under the License.
  13  *
  14  * When distributing Covered Code, include this CDDL HEADER in each
  15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  16  * If applicable, add the following below this CDDL HEADER, with the
  17  * fields enclosed by brackets "[]" replaced with your own identifying
  18  * information: Portions Copyright [yyyy] [name of copyright owner]
  19  *
  20  * CDDL HEADER END
  21  */
  22 /*
  23  * Copyright 2003 Sun Microsystems, Inc.  All rights reserved.
  24  * Use is subject to license terms.
  25  */
  26 /*      Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
  27 /*        All Rights Reserved   */
  28
  29
  30 #pragma ident   "%Z%%M% %I%     %E% SMI"        /* SVr4.0 1.8   */
  31
  32 #include <stdio.h>
  33 #include <string.h>
  34 #include <errno.h>
  35 #include <unistd.h>
  36 #include <stdlib.h>
  37
  38 int
  39 main(int argc, char **argv)
  40 {
  41         if (argc < 3) {
  42                 (void) fprintf(stderr,
  43                     "usage: chroot rootdir command [arg ...]\n");
  44                 exit(1);
  45         }
  46
  47         if (chroot(argv[1]) != 0) {
  48                 (void) fprintf(stderr, "chroot(\"%s\"): %s\n", argv[1],
  49                     strerror(errno));
  50                 exit(1);
  51         }
  52
  53         if (chdir("/") != 0) {
  54                 (void) fprintf(stderr, "Can't chdir to new root\n");
  55                 exit(1);
  56         }
  57
  58         (void) execv(argv[2], &argv[2]);
  59         perror("chroot: exec failed");
  60         return (1);
  61 }