diff options
Diffstat (limited to 'REORG.TODO/sysdeps/unix/sysv/linux/kernel-features.h')
| -rw-r--r-- | REORG.TODO/sysdeps/unix/sysv/linux/kernel-features.h | 104 |
1 files changed, 104 insertions, 0 deletions
diff --git a/REORG.TODO/sysdeps/unix/sysv/linux/kernel-features.h b/REORG.TODO/sysdeps/unix/sysv/linux/kernel-features.h new file mode 100644 index 0000000000..9495db4fef --- /dev/null +++ b/REORG.TODO/sysdeps/unix/sysv/linux/kernel-features.h @@ -0,0 +1,104 @@ +/* Set flags signalling availability of kernel features based on given + kernel version number. + Copyright (C) 1999-2017 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. */ |