glibc/sysdeps/unix/sysv/linux/posix_fallocate.c

/* Copyright (C) 2007-2016 Free Software Foundation, Inc.
   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, see
   <http://www.gnu.org/licenses/>.  */

#include <fcntl.h>
#include <sysdep.h>

#define posix_fallocate static internal_fallocate
#include <sysdeps/posix/posix_fallocate.c>
#undef posix_fallocate

/* Reserve storage for the data of the file associated with FD.  */
int
posix_fallocate (int fd, __off_t offset, __off_t len)
{
  INTERNAL_SYSCALL_DECL (err);
  int res = INTERNAL_SYSCALL (fallocate, err, 6, fd, 0,
			      __LONG_LONG_PAIR (offset >> 31, offset),
			      __LONG_LONG_PAIR (len >> 31, len));

  if (! INTERNAL_SYSCALL_ERROR_P (res, err))
    return 0;
  if (INTERNAL_SYSCALL_ERRNO (res, err) != EOPNOTSUPP)
    return INTERNAL_SYSCALL_ERRNO (res, err);
  return internal_fallocate (fd, offset, len);
}