| 1 | /* Copyright (C) 2003-2024 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 alignment 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 | |
|---|
| 41 | int |
|---|
| 42 | posix_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 | |
|---|
