1/* Set flags signalling availability of kernel features based on given
2 kernel version number.
3 Copyright (C) 1999-2016 Free Software Foundation, Inc.
4 This file is part of the GNU C Library.
5
6 The GNU C Library is free software; you can redistribute it and/or
7 modify it under the terms of the GNU Lesser General Public
8 License as published by the Free Software Foundation; either
9 version 2.1 of the License, or (at your option) any later version.
10
11 The GNU C Library is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 Lesser General Public License for more details.
15
16 You should have received a copy of the GNU Lesser General Public
17 License along with the GNU C Library; if not, see
18 <http://www.gnu.org/licenses/>. */
19
20/* This file must not contain any C code. At least it must be protected
21 to allow using the file also in assembler files. */
22
23#ifndef __LINUX_KERNEL_VERSION
24/* We assume the worst; all kernels should be supported. */
25# define __LINUX_KERNEL_VERSION 0
26#endif
27
28/* We assume for __LINUX_KERNEL_VERSION the same encoding used in
29 linux/version.h. I.e., the major, minor, and subminor all get a
30 byte with the major number being in the highest byte. This means
31 we can do numeric comparisons.
32
33 In the following we will define certain symbols depending on
34 whether the describes kernel feature is available in the kernel
35 version given by __LINUX_KERNEL_VERSION. We are not always exactly
36 recording the correct versions in which the features were
37 introduced. If somebody cares these values can afterwards be
38 corrected. */
39
40/* The sendfile syscall was introduced in 2.2.0. */
41#define __ASSUME_SENDFILE 1
42
43/* Some architectures use the socketcall multiplexer for some or all
44 socket-related operations instead of separate syscalls.
45 __ASSUME_SOCKETCALL is defined for such architectures. */
46
47/* The changed st_ino field appeared in 2.4.0-test6. However, SH is lame,
48 and still does not have a 64-bit inode field. */
49#define __ASSUME_ST_INO_64_BIT 1
50
51/* The statfs64 syscalls are available in 2.5.74 (but not for alpha). */
52#define __ASSUME_STATFS64 1
53
54/* pselect/ppoll were introduced just after 2.6.16-rc1. On x86_64 and
55 SH this appeared first in 2.6.19-rc1, on ia64 in 2.6.22-rc1. */
56#define __ASSUME_PSELECT 1
57
58/* The *at syscalls were introduced just after 2.6.16-rc1. On PPC
59 they were introduced in 2.6.17-rc1, on SH in 2.6.19-rc1. */
60#define __ASSUME_ATFCTS 1
61
62/* Support for inter-process robust mutexes was added in 2.6.17 (but
63 some architectures lack futex_atomic_cmpxchg_inatomic in some
64 configurations). */
65#define __ASSUME_SET_ROBUST_LIST 1
66
67/* Support for private futexes was added in 2.6.22. */
68#define __ASSUME_PRIVATE_FUTEX 1
69
70/* Support for various CLOEXEC and NONBLOCK flags was added in
71 2.6.23. */
72#define __ASSUME_O_CLOEXEC 1
73
74/* Support for various CLOEXEC and NONBLOCK flags was added in
75 2.6.27. */
76#define __ASSUME_IN_NONBLOCK 1
77#define __ASSUME_PIPE2 1
78#define __ASSUME_DUP3 1
79
80/* Support for accept4 functionality was added in 2.6.28, but for some
81 architectures using a separate syscall rather than socketcall that
82 syscall was only added later, and some architectures first had
83 socketcall support then a separate syscall. Define
84 __ASSUME_ACCEPT4_SOCKETCALL if glibc uses socketcall on this
85 architecture and accept4 is available through socketcall,
86 __ASSUME_ACCEPT4_SYSCALL if it is available through a separate
87 syscall, __ASSUME_ACCEPT4_SYSCALL_WITH_SOCKETCALL if it became
88 available through a separate syscall at the same time as through
89 socketcall, and __ASSUME_ACCEPT4 if the accept4 function is known
90 to work. */
91#ifdef __ASSUME_SOCKETCALL
92# define __ASSUME_ACCEPT4_SOCKETCALL 1
93#endif
94#define __ASSUME_ACCEPT4_SYSCALL 1
95#define __ASSUME_ACCEPT4 1
96
97/* Support for the FUTEX_CLOCK_REALTIME flag was added in 2.6.29. */
98#define __ASSUME_FUTEX_CLOCK_REALTIME 1
99
100/* Support for preadv and pwritev was added in 2.6.30. */
101#define __ASSUME_PREADV 1
102#define __ASSUME_PWRITEV 1
103
104/* Support for FUTEX_*_REQUEUE_PI was added in 2.6.31 (but some
105 architectures lack futex_atomic_cmpxchg_inatomic in some
106 configurations). */
107#define __ASSUME_REQUEUE_PI 1
108
109/* Support for recvmmsg functionality was added in 2.6.33. The macros
110 defined correspond to those for accept4. */
111#if __LINUX_KERNEL_VERSION >= 0x020621
112# ifdef __ASSUME_SOCKETCALL
113# define __ASSUME_RECVMMSG_SOCKETCALL 1
114# endif
115# define __ASSUME_RECVMMSG_SYSCALL 1
116# define __ASSUME_RECVMMSG 1
117#endif
118
119/* Support for /proc/self/task/$tid/comm and /proc/$pid/task/$tid/comm was
120 added in 2.6.33. */
121#if __LINUX_KERNEL_VERSION >= 0x020621
122# define __ASSUME_PROC_PID_TASK_COMM 1
123#endif
124
125/* statfs fills in f_flags since 2.6.36. */
126#if __LINUX_KERNEL_VERSION >= 0x020624
127# define __ASSUME_STATFS_F_FLAGS 1
128#endif
129
130/* prlimit64 is available in 2.6.36. */
131#if __LINUX_KERNEL_VERSION >= 0x020624
132# define __ASSUME_PRLIMIT64 1
133#endif
134
135/* Support for sendmmsg functionality was added in 3.0. The macros
136 defined correspond to those for accept4 and recvmmsg. */
137#if __LINUX_KERNEL_VERSION >= 0x030000
138# ifdef __ASSUME_SOCKETCALL
139# define __ASSUME_SENDMMSG_SOCKETCALL 1
140# endif
141# define __ASSUME_SENDMMSG_SYSCALL 1
142# define __ASSUME_SENDMMSG 1
143#endif
144
145/* On most architectures, most socket syscalls are supported for all
146 supported kernel versions, but on some socketcall architectures
147 separate syscalls were only added later. */
148#define __ASSUME_SENDMSG_SYSCALL 1
149#define __ASSUME_RECVMSG_SYSCALL 1
150