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