sysdeps/unix/sysv/linux/i386/posix_fallocate64.c

   1 /* Copyright (C) 2007 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 <fcntl.h>
  20 #include <kernel-features.h>
  21 #include <sysdep.h>
  22
  23 extern int __posix_fallocate64_l64 (int fd, __off64_t offset, __off64_t len);
  24 #define __posix_fallocate64_l64 static internal_fallocate64
  25 #include <sysdeps/posix/posix_fallocate64.c>
  26 #undef __posix_fallocate64_l64
  27
  28 #if !defined __ASSUME_FALLOCATE && defined __NR_fallocate
  29 /* Defined in posix_fallocate.c.  */
  30 extern int __have_fallocate attribute_hidden;
  31 #endif
  32
  33 extern int __call_fallocate (int fd, int mode, __off64_t offset, __off64_t len)
  34      attribute_hidden;
  35
  36 /* Reserve storage for the data of the file associated with FD.  */
  37 int
  38 __posix_fallocate64_l64 (int fd, __off64_t offset, __off64_t len)
  39 {
  40 #ifdef __NR_fallocate
  41 # ifndef __ASSUME_FALLOCATE
  42   if (__builtin_expect (__have_fallocate >= 0, 1))
  43 # endif
  44     {
  45       int res = __call_fallocate (fd, 0, offset, len);
  46
  47       if (! res)
  48         return 0;
  49
  50 # ifndef __ASSUME_FALLOCATE
  51       if (__builtin_expect (res == ENOSYS, 0))
  52         __have_fallocate = -1;
  53       else
  54 # endif
  55         if (res != EOPNOTSUPP)
  56           return res;
  57     }
  58 #endif
  59
  60   return internal_fallocate64 (fd, offset, len);
  61 }