1 | /* Copyright (C) 2003-2018 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 | /* 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 both tile 32-bits and mips o32. Tile |
35 | will set __ASSUME_FADVISE64_64_NO_ALIGN to issue a 6 argument syscall, |
36 | while mips will use a 7 argument one with __NR_fadvise64. |
37 | |
38 | s390 implements fadvice64_64 using a specific struct with arguments |
39 | packed inside. This is the only implementation handled in arch-specific |
40 | code. */ |
41 | |
42 | int |
43 | posix_fadvise (int fd, off_t offset, off_t len, int advise) |
44 | { |
45 | INTERNAL_SYSCALL_DECL (err); |
46 | # if defined (__NR_fadvise64) && !defined (__ASSUME_FADVISE64_AS_64_64) |
47 | int ret = INTERNAL_SYSCALL_CALL (fadvise64, err, fd, |
48 | __ALIGNMENT_ARG SYSCALL_LL (offset), |
49 | len, advise); |
50 | # else |
51 | # ifdef __ASSUME_FADVISE64_64_6ARG |
52 | int ret = INTERNAL_SYSCALL_CALL (fadvise64_64, err, fd, advise, |
53 | SYSCALL_LL (offset), SYSCALL_LL (len)); |
54 | # else |
55 | |
56 | # ifdef __ASSUME_FADVISE64_64_NO_ALIGN |
57 | # undef __ALIGNMENT_ARG |
58 | # define __ALIGNMENT_ARG |
59 | # endif |
60 | |
61 | # ifndef __NR_fadvise64_64 |
62 | # define __NR_fadvise64_64 __NR_fadvise64 |
63 | # endif |
64 | |
65 | int ret = INTERNAL_SYSCALL_CALL (fadvise64_64, err, fd, |
66 | __ALIGNMENT_ARG SYSCALL_LL (offset), |
67 | SYSCALL_LL (len), advise); |
68 | # endif |
69 | # endif |
70 | if (INTERNAL_SYSCALL_ERROR_P (ret, err)) |
71 | return INTERNAL_SYSCALL_ERRNO (ret, err); |
72 | return 0; |
73 | } |
74 | #endif /* __OFF_T_MATCHES_OFF64_T */ |
75 | |