1/* Copyright (C) 2003-2017 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 <shlib-compat.h>
21
22int __posix_fadvise64_l64 (int fd, off64_t offset, off64_t len, int advise);
23
24/* Both arm and powerpc implements fadvise64_64 with last 'advise' argument
25 just after 'fd' to avoid the requirement of implementing 7-arg syscalls.
26 ARM also defines __NR_fadvise64_64 as __NR_arm_fadvise64_64.
27
28 tile requires __ASSUME_ALIGNED_REGISTER_PAIRS but implements the 32-bit
29 fadvise64_64 without the padding 0 after fd.
30
31 s390 implements fadvice64_64 using a specific struct with arguments
32 packed inside. This is the only implementation handled in arch-specific
33 code. */
34
35#ifdef __ASSUME_FADVISE64_64_NO_ALIGN
36# undef __ALIGNMENT_ARG
37# define __ALIGNMENT_ARG
38#endif
39
40#ifndef __NR_fadvise64_64
41# define __NR_fadvise64_64 __NR_fadvise64
42#endif
43
44/* Advice the system about the expected behaviour of the application with
45 respect to the file associated with FD. */
46
47int
48__posix_fadvise64_l64 (int fd, off64_t offset, off64_t len, int advise)
49{
50 INTERNAL_SYSCALL_DECL (err);
51#ifdef __ASSUME_FADVISE64_64_6ARG
52 int ret = INTERNAL_SYSCALL_CALL (fadvise64_64, err, fd, advise,
53 SYSCALL_LL64 (offset), SYSCALL_LL64 (len));
54#else
55 int ret = INTERNAL_SYSCALL_CALL (fadvise64_64, err, fd,
56 __ALIGNMENT_ARG SYSCALL_LL64 (offset),
57 SYSCALL_LL64 (len), advise);
58#endif
59 if (!INTERNAL_SYSCALL_ERROR_P (ret, err))
60 return 0;
61 return INTERNAL_SYSCALL_ERRNO (ret, err);
62}
63
64/* The type of the len argument was changed from size_t to off_t in
65 POSIX.1-2003 TC1. */
66#ifndef __OFF_T_MATCHES_OFF64_T
67# if SHLIB_COMPAT(libc, GLIBC_2_2, GLIBC_2_3_3)
68int __posix_fadvise64_l32 (int fd, off64_t offset, size_t len, int advise);
69
70int
71attribute_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
77versioned_symbol (libc, __posix_fadvise64_l64, posix_fadvise64, GLIBC_2_3_3);
78compat_symbol (libc, __posix_fadvise64_l32, posix_fadvise64, GLIBC_2_2);
79# else
80weak_alias (__posix_fadvise64_l64, posix_fadvise64);
81# endif
82#else
83weak_alias (__posix_fadvise64_l64, posix_fadvise64);
84strong_alias (__posix_fadvise64_l64, posix_fadvise);
85#endif
86