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
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/* Default implementation will use __NR_fadvise64 with expected argument
28 positions (for instance i386 and powerpc32 that uses __ALIGNMENT_ARG).
29
30 Second option will be used by arm which define __NR_arm_fadvise64_64
31 (redefined to __NR_fadvise64_64 in kernel-features.h) that behaves as
32 __NR_fadvise64_64 (without the aligment argument required for the ABI).
33
34 Third option will be used by mips o32. Mips will use a 7 argument
35 syscall with __NR_fadvise64.
36
37 s390 implements fadvice64_64 using a specific struct with arguments
38 packed inside. This is the only implementation handled in arch-specific
39 code. */
40
41int
42posix_fadvise (int fd, off_t offset, off_t len, int advise)
43{
44# if defined (__NR_fadvise64) && !defined (__ASSUME_FADVISE64_AS_64_64)
45 int ret = INTERNAL_SYSCALL_CALL (fadvise64, fd,
46 __ALIGNMENT_ARG SYSCALL_LL (offset),
47 len, advise);
48# else
49# ifdef __ASSUME_FADVISE64_64_6ARG
50 int ret = INTERNAL_SYSCALL_CALL (fadvise64_64, fd, advise,
51 SYSCALL_LL (offset), SYSCALL_LL (len));
52# else
53
54# ifndef __NR_fadvise64_64
55# define __NR_fadvise64_64 __NR_fadvise64
56# endif
57
58 int ret = INTERNAL_SYSCALL_CALL (fadvise64_64, fd,
59 __ALIGNMENT_ARG SYSCALL_LL (offset),
60 SYSCALL_LL (len), advise);
61# endif
62# endif
63 if (INTERNAL_SYSCALL_ERROR_P (ret))
64 return INTERNAL_SYSCALL_ERRNO (ret);
65 return 0;
66}
67#endif /* __OFF_T_MATCHES_OFF64_T */
68