sysdeps/unix/sysv/linux/sh/chown.c

   1 /* Copyright (C) 1998,2000,2002,2003,2006 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_chown32
  30 # if __ASSUME_32BITUIDS == 0
  31 /* This variable is shared with all files that need to check for 32bit
  32    uids.  */
  33 extern int __libc_missing_32bit_uids;
  34 # endif
  35 #endif /* __NR_chown32 */
  36
  37 int
  38 __chown (const char *file, uid_t owner, gid_t group)
  39 {
  40 #if __ASSUME_32BITUIDS > 0
  41   return INLINE_SYSCALL (chown32, 3, CHECK_STRING (file), owner, group);
  42 #else
  43 # ifdef __NR_chown32
  44   if (__libc_missing_32bit_uids <= 0)
  45     {
  46       int result;
  47       int saved_errno = errno;
  48
  49       result = INLINE_SYSCALL (chown32, 3, CHECK_STRING (file), owner, group);
  50       if (result == 0 || errno != ENOSYS)
  51         return result;
  52
  53       __set_errno (saved_errno);
  54       __libc_missing_32bit_uids = 1;
  55     }
  56 # endif /* __NR_chown32 */
  57
  58   if (((owner + 1) > (gid_t) ((__kernel_uid_t) -1U))
  59       || ((group + 1) > (gid_t) ((__kernel_gid_t) -1U)))
  60     {
  61       __set_errno (EINVAL);
  62       return -1;
  63     }
  64
  65   return INLINE_SYSCALL (chown, 3, CHECK_STRING (file), owner, group);
  66 #endif
  67 }
  68 libc_hidden_def (__chown)
  69 weak_alias (__chown, chown)