tools/compat/lchown.c

   1 /*      $NetBSD: lchown.c,v 1.4 2008/04/28 20:24:12 martin Exp $        */
   2
   3 /*-
   4  * Copyright (c) 2002 The NetBSD Foundation, Inc.
   5  * All rights reserved.
   6  *
   7  * This code is derived from software contributed to The NetBSD Foundation
   8  * by Luke Mewburn.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
  20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
  23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  29  * POSSIBILITY OF SUCH DAMAGE.
  30  */
  31
  32 /* Emulate lchown(2), checking path with lstat(2) first to ensure that
  33  * it's not a symlink, and then call chown(2) */
  34
  35 #if !defined(__minix) && !defined(_LIBC)
  36 #include "nbtool_config.h"
  37 #endif /* !defined(__minix) && !defined(_LIBC) */
  38
  39 #if !HAVE_LCHOWN
  40 #include <sys/stat.h>
  41 #include <errno.h>
  42 #include <unistd.h>
  43
  44 #if defined(__minix) && defined(__weak_alias) && defined(_LIBC)
  45 __weak_alias(__posix_lchown, lchown)
  46 #endif /* defined(__minix) && defined(__weak_alias) && defined(_LIBC) */
  47
  48 int
  49 lchown(const char *path, uid_t owner, gid_t group)
  50 {
  51         struct stat psb;
  52
  53         if (lstat(path, &psb) == -1)
  54                 return -1;
  55         if (S_ISLNK(psb.st_mode)) {
  56                 return 0;
  57         }
  58         return (chown(path, owner, group));
  59 }
  60 #endif