sysdeps/unix/sysv/linux/m68k/chown.c

   1 /* Copyright (C) 1998, 2000, 2002 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 extern int __syscall_chown (const char *__unbounded __file,
  30                             __kernel_uid_t __owner, __kernel_gid_t __group);
  31
  32 #ifdef __NR_chown32
  33 extern int __syscall_chown32 (const char *__unbounded __file,
  34                               __kernel_uid32_t owner, __kernel_gid32_t group);
  35
  36 # if __ASSUME_32BITUIDS == 0
  37 /* This variable is shared with all files that need to check for 32bit
  38    uids.  */
  39 extern int __libc_missing_32bit_uids;
  40 # endif
  41 #endif /* __NR_chown32 */
  42
  43 int
  44 __chown (const char *file, uid_t owner, gid_t group)
  45 {
  46 #if __ASSUME_32BITUIDS > 0
  47   return INLINE_SYSCALL (chown32, 3, CHECK_STRING (file), owner, group);
  48 #else
  49 # ifdef __NR_chown32
  50   if (__libc_missing_32bit_uids <= 0)
  51     {
  52       int result;
  53       int saved_errno = errno;
  54
  55       result = INLINE_SYSCALL (chown32, 3, CHECK_STRING (file), owner, group);
  56       if (result == 0 || errno != ENOSYS)
  57         return result;
  58
  59       __set_errno (saved_errno);
  60       __libc_missing_32bit_uids = 1;
  61     }
  62 # endif /* __NR_chown32 */
  63
  64   if (((owner + 1) > (gid_t) ((__kernel_uid_t) -1U))
  65       || ((group + 1) > (gid_t) ((__kernel_gid_t) -1U)))
  66     {
  67       __set_errno (EINVAL);
  68       return -1;
  69     }
  70
  71   return INLINE_SYSCALL (chown, 3, CHECK_STRING (file), owner, group);
  72 #endif
  73 }
  74 libc_hidden_def (__chown)
  75 weak_alias (__chown, chown)