sysdeps/unix/sysv/linux/posix_fadvise64.c

   1 /* Copyright (C) 2003, 2004 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 #include <kernel-features.h>
  22
  23 int __posix_fadvise64_l64 (int fd, off64_t offset, off64_t len, int advise);
  24 int __posix_fadvise64_l32 (int fd, off64_t offset, size_t len, int advise);
  25
  26 /* Advice the system about the expected behaviour of the application with
  27    respect to the file associated with FD.  */
  28
  29 int
  30 __posix_fadvise64_l64 (int fd, off64_t offset, off64_t len, int advise)
  31 {
  32 #ifdef __NR_fadvise64_64
  33   INTERNAL_SYSCALL_DECL (err);
  34   int ret = INTERNAL_SYSCALL (fadvise64_64, err, 6, fd,
  35                               __LONG_LONG_PAIR ((long) (offset >> 32),
  36                                                 (long) offset),
  37                               __LONG_LONG_PAIR ((long) (len >> 32),
  38                                                 (long) len),
  39                               advise);
  40   if (!INTERNAL_SYSCALL_ERROR_P (ret, err))
  41     return 0;
  42 # ifndef __ASSUME_FADVISE64_64_SYSCALL
  43   if (INTERNAL_SYSCALL_ERRNO (ret, err) != ENOSYS)
  44 # endif
  45    return INTERNAL_SYSCALL_ERRNO (ret, err);
  46 #endif
  47 #ifndef __ASSUME_FADVISE64_64_SYSCALL
  48 # ifdef __NR_fadvise64
  49   if (len != (off_t) len)
  50     return EOVERFLOW;
  51
  52   INTERNAL_SYSCALL_DECL (err2);
  53   int ret2 = INTERNAL_SYSCALL (fadvise64, err2, 5, fd,
  54                                __LONG_LONG_PAIR ((long) (offset >> 32),
  55                                                  (long) offset),
  56                                (off_t) len, advise);
  57   if (!INTERNAL_SYSCALL_ERROR_P (ret2, err2))
  58     return 0;
  59   return INTERNAL_SYSCALL_ERRNO (ret2, err2);
  60 # else
  61   return ENOSYS;
  62 # endif
  63 #endif
  64 }
  65
  66 #include <shlib-compat.h>
  67
  68 #if SHLIB_COMPAT(libc, GLIBC_2_2, GLIBC_2_3_3)
  69
  70 int
  71 attribute_compat_text_section
  72 __posix_fadvise64_l32 (int fd, off64_t offset, size_t len, int advise)
  73 {
  74   return __posix_fadvise64_l64 (fd, offset, len, advise);
  75 }
  76
  77 versioned_symbol (libc, __posix_fadvise64_l64, posix_fadvise64, GLIBC_2_3_3);
  78 compat_symbol (libc, __posix_fadvise64_l32, posix_fadvise64, GLIBC_2_2);
  79 #else
  80 strong_alias (__posix_fadvise64_l64, posix_fadvise64);
  81 #endif