sysdeps/unix/sysv/linux/posix_fadvise64.c

   1 /* Copyright (C) 2003-2014 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.h>
  21
  22 int __posix_fadvise64_l64 (int fd, off64_t offset, off64_t len, int advise);
  23 int __posix_fadvise64_l32 (int fd, off64_t offset, size_t len, int advise);
  24
  25 /* Advice the system about the expected behaviour of the application with
  26    respect to the file associated with FD.  */
  27
  28 int
  29 __posix_fadvise64_l64 (int fd, off64_t offset, off64_t len, int advise)
  30 {
  31   INTERNAL_SYSCALL_DECL (err);
  32   int ret = INTERNAL_SYSCALL (fadvise64_64, err, 6, fd,
  33                               __LONG_LONG_PAIR ((long) (offset >> 32),
  34                                                 (long) offset),
  35                               __LONG_LONG_PAIR ((long) (len >> 32),
  36                                                 (long) len),
  37                               advise);
  38   if (!INTERNAL_SYSCALL_ERROR_P (ret, err))
  39     return 0;
  40   return INTERNAL_SYSCALL_ERRNO (ret, err);
  41 }
  42
  43 #include <shlib-compat.h>
  44
  45 #if SHLIB_COMPAT(libc, GLIBC_2_2, GLIBC_2_3_3)
  46
  47 int
  48 attribute_compat_text_section
  49 __posix_fadvise64_l32 (int fd, off64_t offset, size_t len, int advise)
  50 {
  51   return __posix_fadvise64_l64 (fd, offset, len, advise);
  52 }
  53
  54 versioned_symbol (libc, __posix_fadvise64_l64, posix_fadvise64, GLIBC_2_3_3);
  55 compat_symbol (libc, __posix_fadvise64_l32, posix_fadvise64, GLIBC_2_2);
  56 #else
  57 strong_alias (__posix_fadvise64_l64, posix_fadvise64);
  58 #endif