| /* Copyright (C) 2003-2018 Free Software Foundation, Inc. |
| This file is part of the GNU C Library. |
| |
| The GNU C Library is free software; you can redistribute it and/or |
| modify it under the terms of the GNU Lesser General Public |
| License as published by the Free Software Foundation; either |
| version 2.1 of the License, or (at your option) any later version. |
| |
| The GNU C Library is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| Lesser General Public License for more details. |
| |
| You should have received a copy of the GNU Lesser General Public |
| License along with the GNU C Library; if not, see |
| <http://www.gnu.org/licenses/>. */ |
| |
| #include <errno.h> |
| #include <fcntl.h> |
| #include <sysdep.h> |
| |
| /* Advice the system about the expected behaviour of the application with |
| respect to the file associated with FD. */ |
| |
| #ifndef __OFF_T_MATCHES_OFF64_T |
| |
| /* Default implementation will use __NR_fadvise64 with expected argument |
| positions (for instance i386 and powerpc32 that uses __ALIGNMENT_ARG). |
| |
| Second option will be used by arm which define __NR_arm_fadvise64_64 |
| (redefined to __NR_fadvise64_64 in kernel-features.h) that behaves as |
| __NR_fadvise64_64 (without the aligment argument required for the ABI). |
| |
| Third option will be used by both tile 32-bits and mips o32. Tile |
| will set __ASSUME_FADVISE64_64_NO_ALIGN to issue a 6 argument syscall, |
| while mips will use a 7 argument one with __NR_fadvise64. |
| |
| s390 implements fadvice64_64 using a specific struct with arguments |
| packed inside. This is the only implementation handled in arch-specific |
| code. */ |
| |
| int |
| posix_fadvise (int fd, off_t offset, off_t len, int advise) |
| { |
| INTERNAL_SYSCALL_DECL (err); |
| # if defined (__NR_fadvise64) && !defined (__ASSUME_FADVISE64_AS_64_64) |
| int ret = INTERNAL_SYSCALL_CALL (fadvise64, err, fd, |
| __ALIGNMENT_ARG SYSCALL_LL (offset), |
| len, advise); |
| # else |
| # ifdef __ASSUME_FADVISE64_64_6ARG |
| int ret = INTERNAL_SYSCALL_CALL (fadvise64_64, err, fd, advise, |
| SYSCALL_LL (offset), SYSCALL_LL (len)); |
| # else |
| |
| # ifdef __ASSUME_FADVISE64_64_NO_ALIGN |
| # undef __ALIGNMENT_ARG |
| # define __ALIGNMENT_ARG |
| # endif |
| |
| # ifndef __NR_fadvise64_64 |
| # define __NR_fadvise64_64 __NR_fadvise64 |
| # endif |
| |
| int ret = INTERNAL_SYSCALL_CALL (fadvise64_64, err, fd, |
| __ALIGNMENT_ARG SYSCALL_LL (offset), |
| SYSCALL_LL (len), advise); |
| # endif |
| # endif |
| if (INTERNAL_SYSCALL_ERROR_P (ret, err)) |
| return INTERNAL_SYSCALL_ERRNO (ret, err); |
| return 0; |
| } |
| #endif /* __OFF_T_MATCHES_OFF64_T */ |