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 <sysdep.h>
21
22/* Advice the system about the expected behaviour of the application with
23 respect to the file associated with FD. */
24
25#ifndef __OFF_T_MATCHES_OFF64_T
26
27/* Both arm and powerpc implements fadvise64_64 with last 'advise' argument
28 just after 'fd' to avoid the requirement of implementing 7-arg syscalls.
29 ARM also defines __NR_fadvise64_64 as __NR_arm_fadvise64_64.
30
31 tile requires __ASSUME_ALIGNED_REGISTER_PAIRS but implements the 32-bit
32 fadvise64_64 without the padding 0 after fd.
33
34 s390 implements fadvice64_64 using a specific struct with arguments
35 packed inside. This is the only implementation handled in arch-specific
36 code. */
37
38int
39posix_fadvise (int fd, off_t offset, off_t len, int advise)
40{
41 INTERNAL_SYSCALL_DECL (err);
42# ifdef __NR_fadvise64
43 int ret = INTERNAL_SYSCALL_CALL (fadvise64, err, fd,
44 __ALIGNMENT_ARG SYSCALL_LL (offset),
45 len, advise);
46# else
47# ifdef __ASSUME_FADVISE64_64_6ARG
48 int ret = INTERNAL_SYSCALL_CALL (fadvise64_64, err, fd, advise,
49 __ALIGNMENT_ARG SYSCALL_LL (offset),
50 SYSCALL_LL (len));
51# else
52
53# ifdef __ASSUME_FADVISE64_64_NO_ALIGN
54# undef __ALIGNMENT_ARG
55# define __ALIGNMENT_ARG
56# endif
57
58 int ret = INTERNAL_SYSCALL_CALL (fadvise64_64, err, fd,
59 __ALIGNMENT_ARG SYSCALL_LL (offset),
60 SYSCALL_LL (len), advise);
61# endif
62# endif
63 if (INTERNAL_SYSCALL_ERROR_P (ret, err))
64 return INTERNAL_SYSCALL_ERRNO (ret, err);
65 return 0;
66}
67#endif /* __OFF_T_MATCHES_OFF64_T */
68