sysdeps/unix/sysv/linux/posix_fadvise.c

   1 /* Copyright (C) 2003 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 <fcntl.h>
  21 #include <sysdep.h>
  22
  23 /* Advice the system about the expected behaviour of the application with
  24    respect to the file associated with FD.  */
  25
  26 int
  27 posix_fadvise (int fd, off_t offset, off_t len, int advise)
  28 {
  29 #ifdef __NR_fadvise64
  30   INTERNAL_SYSCALL_DECL (err);
  31   int ret = INTERNAL_SYSCALL (fadvise64, err, 5, fd,
  32                               __LONG_LONG_PAIR (offset >> 31, offset), len,
  33                               advise);
  34   if (INTERNAL_SYSCALL_ERROR_P (ret, err))
  35     return INTERNAL_SYSCALL_ERRNO (ret, err);
  36   return 0;
  37 #else
  38   return ENOSYS;
  39 #endif
  40 }