sysdeps/unix/sysv/linux/i386/posix_fallocate.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 #define posix_fallocate static internal_fallocate
  24 #include <sysdeps/posix/posix_fallocate.c>
  25 #undef posix_fallocate
  26
  27 #if !defined __ASSUME_FALLOCATE && defined __NR_fallocate
  28 int __have_fallocate attribute_hidden;
  29 #endif
  30
  31 extern int __call_fallocate (int fd, int mode, __off64_t offset, __off64_t len)
  32      attribute_hidden;
  33
  34 /* Reserve storage for the data of the file associated with FD.  */
  35 int
  36 posix_fallocate (int fd, __off_t offset, __off_t len)
  37 {
  38 #ifdef __NR_fallocate
  39 # ifndef __ASSUME_FALLOCATE
  40   if (__builtin_expect (__have_fallocate >= 0, 1))
  41 # endif
  42     {
  43       int res = __call_fallocate (fd, 0, offset, len);
  44       if (! res)
  45         return 0;
  46
  47 # ifndef __ASSUME_FALLOCATE
  48       if (__builtin_expect (res == ENOSYS, 0))
  49         __have_fallocate = -1;
  50       else
  51 # endif
  52         if (res != EOPNOTSUPP)
  53           return res;
  54     }
  55 #endif
  56
  57   return internal_fallocate (fd, offset, len);
  58 }