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/* Provide a stub lchown function for systems that lack it.
Copyright (C) 1998, 1999, 2002, 2004, 2006, 2007 Free Software
Foundation, Inc.
This program 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 3 of the License, or
(at your option) any later version.
This program 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.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
/* written by Jim Meyering */
#include <config.h>
/* If the system chown does not follow symlinks, we don't want it
replaced by gnulib's chown, which does follow symlinks. */
#if CHOWN_MODIFIES_SYMLINK
# define REPLACE_CHOWN 0
#endif
#include <unistd.h>
#include <errno.h>
#include <sys/stat.h>
/* Some systems don't have EOPNOTSUPP. */
#ifndef EOPNOTSUPP
# ifdef ENOTSUP
# define EOPNOTSUPP ENOTSUP
# else
/* Some systems don't have ENOTSUP either. */
# define EOPNOTSUPP EINVAL
# endif
#endif
/* Work just like chown, except when FILE is a symbolic link.
In that case, set errno to EOPNOTSUPP and return -1.
But if autoconf tests determined that chown modifies
symlinks, then just call chown. */
int
lchown (const char *file, uid_t uid, gid_t gid)
{
#if ! CHOWN_MODIFIES_SYMLINK
struct stat stats;
if (lstat (file, &stats) == 0 && S_ISLNK (stats.st_mode))
{
errno = EOPNOTSUPP;
return -1;
}
#endif
return chown (file, uid, gid);
}
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