| /* Set flags signalling availability of kernel features based on given |
| kernel version number. |
| Copyright (C) 1999-2018 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/>. */ |
| |
| /* This file must not contain any C code. At least it must be protected |
| to allow using the file also in assembler files. */ |
| |
| #ifndef __LINUX_KERNEL_VERSION |
| /* We assume the worst; all kernels should be supported. */ |
| # define __LINUX_KERNEL_VERSION 0 |
| #endif |
| |
| /* We assume for __LINUX_KERNEL_VERSION the same encoding used in |
| linux/version.h. I.e., the major, minor, and subminor all get a |
| byte with the major number being in the highest byte. This means |
| we can do numeric comparisons. |
| |
| In the following we will define certain symbols depending on |
| whether the describes kernel feature is available in the kernel |
| version given by __LINUX_KERNEL_VERSION. We are not always exactly |
| recording the correct versions in which the features were |
| introduced. If somebody cares these values can afterwards be |
| corrected. */ |
| |
| /* The sendfile syscall was introduced in 2.2.0. */ |
| #define __ASSUME_SENDFILE 1 |
| |
| /* Some architectures use the socketcall multiplexer for some or all |
| socket-related operations instead of separate syscalls. |
| __ASSUME_SOCKETCALL is defined for such architectures. */ |
| |
| /* The changed st_ino field appeared in 2.4.0-test6. However, SH is lame, |
| and still does not have a 64-bit inode field. */ |
| #define __ASSUME_ST_INO_64_BIT 1 |
| |
| /* The statfs64 syscalls are available in 2.5.74 (but not for alpha). */ |
| #define __ASSUME_STATFS64 1 |
| |
| /* pselect/ppoll were introduced just after 2.6.16-rc1. On x86_64 and |
| SH this appeared first in 2.6.19-rc1, on ia64 in 2.6.22-rc1. */ |
| #define __ASSUME_PSELECT 1 |
| |
| /* The *at syscalls were introduced just after 2.6.16-rc1. On PPC |
| they were introduced in 2.6.17-rc1, on SH in 2.6.19-rc1. */ |
| #define __ASSUME_ATFCTS 1 |
| |
| /* Support for inter-process robust mutexes was added in 2.6.17 (but |
| some architectures lack futex_atomic_cmpxchg_inatomic in some |
| configurations). */ |
| #define __ASSUME_SET_ROBUST_LIST 1 |
| |
| /* Support for private futexes was added in 2.6.22. */ |
| #define __ASSUME_PRIVATE_FUTEX 1 |
| |
| /* Support for various CLOEXEC and NONBLOCK flags was added in |
| 2.6.27. */ |
| #define __ASSUME_IN_NONBLOCK 1 |
| |
| /* Support for the FUTEX_CLOCK_REALTIME flag was added in 2.6.29. */ |
| #define __ASSUME_FUTEX_CLOCK_REALTIME 1 |
| |
| /* Support for preadv and pwritev was added in 2.6.30. */ |
| #define __ASSUME_PREADV 1 |
| #define __ASSUME_PWRITEV 1 |
| |
| /* Support for sendmmsg functionality was added in 3.0. */ |
| #define __ASSUME_SENDMMSG 1 |
| |
| /* On most architectures, most socket syscalls are supported for all |
| supported kernel versions, but on some socketcall architectures |
| separate syscalls were only added later. */ |
| #define __ASSUME_SENDMSG_SYSCALL 1 |
| #define __ASSUME_RECVMSG_SYSCALL 1 |
| #define __ASSUME_ACCEPT_SYSCALL 1 |
| #define __ASSUME_CONNECT_SYSCALL 1 |
| #define __ASSUME_RECVFROM_SYSCALL 1 |
| #define __ASSUME_SENDTO_SYSCALL 1 |
| #define __ASSUME_ACCEPT4_SYSCALL 1 |
| #define __ASSUME_RECVMMSG_SYSCALL 1 |
| #define __ASSUME_SENDMMSG_SYSCALL 1 |
| |
| /* Support for SysV IPC through wired syscalls. All supported architectures |
| either support ipc syscall and/or all the ipc correspondent syscalls. */ |
| #define __ASSUME_DIRECT_SYSVIPC_SYSCALLS 1 |
| |
| /* Support for p{read,write}v2 was added in 4.6. However Linux default |
| implementation does not assume the __ASSUME_* and instead use a fallback |
| implementation based on p{read,write}v and returning an error for |
| non supported flags. */ |
| |
| /* Support for the execveat syscall was added in 3.19. */ |
| #if __LINUX_KERNEL_VERSION >= 0x031300 |
| # define __ASSUME_EXECVEAT 1 |
| #endif |
| |
| #if __LINUX_KERNEL_VERSION >= 0x040400 |
| # define __ASSUME_MLOCK2 1 |
| #endif |
| |
| #if __LINUX_KERNEL_VERSION >= 0x040500 |
| # define __ASSUME_COPY_FILE_RANGE 1 |
| #endif |
