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

   1 /* Copyright (C) 2007-2014 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, see
  16    <http://www.gnu.org/licenses/>.  */
  17
  18 #include <errno.h>
  19 #include <fcntl.h>
  20 #include <sysdep-cancel.h>
  21
  22
  23 extern int __call_fallocate (int fd, int mode, __off64_t offset, __off64_t len)
  24      attribute_hidden;
  25
  26
  27 /* Reserve storage for the data of the file associated with FD.  */
  28 int
  29 fallocate (int fd, int mode, __off_t offset, __off_t len)
  30 {
  31 #ifdef __NR_fallocate
  32   int err;
  33   if (SINGLE_THREAD_P)
  34     err = __call_fallocate (fd, mode, offset, len);
  35   else
  36     {
  37       int oldtype = LIBC_CANCEL_ASYNC ();
  38
  39       err = __call_fallocate (fd, mode, offset, len);
  40
  41       LIBC_CANCEL_RESET (oldtype);
  42     }
  43   if (__builtin_expect (err, 0))
  44     {
  45       __set_errno (err);
  46       err = -1;
  47     }
  48   return err;
  49 #else
  50   __set_errno (ENOSYS);
  51   return -1;
  52 #endif
  53 }