sysdeps/unix/sysv/linux/posix_fadvise64.c

   1 /* Copyright (C) 2003-2020 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    <https://www.gnu.org/licenses/>.  */
  17
  18 #include <errno.h>
  19 #include <fcntl.h>
  20 #include <sysdep.h>
  21 #include <shlib-compat.h>
  22
  23 int __posix_fadvise64_l64 (int fd, off64_t offset, off64_t len, int advise);
  24 libc_hidden_proto (__posix_fadvise64_l64)
  25
  26 /* Both arm and powerpc implements fadvise64_64 with last 'advise' argument
  27    just after 'fd' to avoid the requirement of implementing 7-arg syscalls.
  28    ARM also defines __NR_fadvise64_64 as __NR_arm_fadvise64_64.
  29
  30    s390 implements fadvice64_64 using a specific struct with arguments
  31    packed inside.  This is the only implementation handled in arch-specific
  32    code.  */
  33
  34 #ifndef __NR_fadvise64_64
  35 # define __NR_fadvise64_64 __NR_fadvise64
  36 #endif
  37
  38 /* Advice the system about the expected behaviour of the application with
  39    respect to the file associated with FD.  */
  40
  41 int
  42 __posix_fadvise64_l64 (int fd, off64_t offset, off64_t len, int advise)
  43 {
  44 #ifdef __ASSUME_FADVISE64_64_6ARG
  45   int ret = INTERNAL_SYSCALL_CALL (fadvise64_64, fd, advise,
  46                                    SYSCALL_LL64 (offset), SYSCALL_LL64 (len));
  47 #else
  48   int ret = INTERNAL_SYSCALL_CALL (fadvise64_64, fd,
  49                                    __ALIGNMENT_ARG SYSCALL_LL64 (offset),
  50                                    SYSCALL_LL64 (len), advise);
  51 #endif
  52   if (!INTERNAL_SYSCALL_ERROR_P (ret))
  53     return 0;
  54   return INTERNAL_SYSCALL_ERRNO (ret);
  55 }
  56
  57 /* The type of the len argument was changed from size_t to off_t in
  58    POSIX.1-2003 TC1.  */
  59 #ifndef __OFF_T_MATCHES_OFF64_T
  60 # if SHLIB_COMPAT(libc, GLIBC_2_2, GLIBC_2_3_3)
  61 int __posix_fadvise64_l32 (int fd, off64_t offset, size_t len, int advise);
  62
  63 int
  64 attribute_compat_text_section
  65 __posix_fadvise64_l32 (int fd, off64_t offset, size_t len, int advise)
  66 {
  67   return __posix_fadvise64_l64 (fd, offset, len, advise);
  68 }
  69
  70 versioned_symbol (libc, __posix_fadvise64_l64, posix_fadvise64, GLIBC_2_3_3);
  71 compat_symbol (libc, __posix_fadvise64_l32, posix_fadvise64, GLIBC_2_2);
  72 # else
  73 weak_alias (__posix_fadvise64_l64, posix_fadvise64);
  74 # endif
  75 #else
  76 weak_alias (__posix_fadvise64_l64, posix_fadvise64);
  77 strong_alias (__posix_fadvise64_l64, posix_fadvise);
  78 #endif
  79 libc_hidden_def (__posix_fadvise64_l64)