sysdeps/unix/sysv/linux/i386/lchown.c

   1 /* Copyright (C) 2000,2003,2005,2006 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, write to the Free
  16    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  17    02111-1307 USA.  */
  18
  19 #include <errno.h>
  20 #include <unistd.h>
  21
  22 #include <sysdep.h>
  23 #include <sys/syscall.h>
  24 #include <bp-checks.h>
  25
  26 #include <linux/posix_types.h>
  27 #include <kernel-features.h>
  28
  29 #ifdef __NR_lchown
  30 # ifdef __NR_lchown32
  31 #  if __ASSUME_32BITUIDS == 0
  32 /* This variable is shared with all files that need to check for 32bit
  33    uids.  */
  34 extern int __libc_missing_32bit_uids;
  35 #  endif
  36 # endif /* __NR_lchown32 */
  37
  38 int
  39 __lchown (const char *file, uid_t owner, gid_t group)
  40 {
  41 # if __ASSUME_32BITUIDS > 0
  42   return INLINE_SYSCALL (lchown32, 3, CHECK_STRING (file), owner, group);
  43 # else
  44 #  ifdef __NR_lchown32
  45   if (__libc_missing_32bit_uids <= 0)
  46     {
  47       int result;
  48       int saved_errno = errno;
  49
  50       result = INLINE_SYSCALL (lchown32, 3, CHECK_STRING (file), owner, group);
  51       if (result == 0 || errno != ENOSYS)
  52         return result;
  53
  54       __set_errno (saved_errno);
  55       __libc_missing_32bit_uids = 1;
  56     }
  57 #  endif /* __NR_lchown32 */
  58
  59   if (((owner + 1) > (uid_t) ((__kernel_uid_t) -1U))
  60       || ((group + 1) > (gid_t) ((__kernel_gid_t) -1U)))
  61     {
  62       __set_errno (EINVAL);
  63       return -1;
  64     }
  65
  66   return INLINE_SYSCALL (lchown, 3, CHECK_STRING (file), owner, group);
  67 # endif
  68 }
  69
  70 weak_alias (__lchown, lchown)
  71
  72 #else
  73 # include <io/lchown.c>
  74 #endif