| blob | b52fa73e0d935e75557c8116df7a5f01ff177739 |
1 /* Set flags signalling availability of kernel features based on given
2 kernel version number.
3 Copyright (C) 1999-2003, 2004 Free Software Foundation, Inc.
4 This file is part of the GNU C Library.
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.
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.
16 You should have received a copy of the GNU Lesser General Public
17 License along with the GNU C Library; if not, write to the Free
18 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
19 02111-1307 USA. */
21 /* This file must not contain any C code. At least it must be protected
22 to allow using the file also in assembler files. */
24 #ifndef __LINUX_KERNEL_VERSION
25 /* We assume the worst; all kernels should be supported. */
26 # define __LINUX_KERNEL_VERSION 0
27 #endif
29 /* We assume for __LINUX_KERNEL_VERSION the same encoding used in
30 linux/version.h. I.e., the major, minor, and subminor all get a
31 byte with the major number being in the highest byte. This means
32 we can do numeric comparisons.
34 In the following we will define certain symbols depending on
35 whether the describes kernel feature is available in the kernel
36 version given by __LINUX_KERNEL_VERSION. We are not always exactly
37 recording the correct versions in which the features were
38 introduced. If somebody cares these values can afterwards be
39 corrected. Most of the numbers here are set corresponding to
40 2.2.0. */
42 /* `getcwd' system call. */
43 #if __LINUX_KERNEL_VERSION >= 131584
44 # define __ASSUME_GETCWD_SYSCALL 1
45 #endif
47 /* Real-time signal became usable in 2.1.70. */
48 #if __LINUX_KERNEL_VERSION >= 131398
49 # define __ASSUME_REALTIME_SIGNALS 1
50 #endif
52 /* When were the `pread'/`pwrite' syscalls introduced? */
53 #if __LINUX_KERNEL_VERSION >= 131584
54 # define __ASSUME_PREAD_SYSCALL 1
55 # define __ASSUME_PWRITE_SYSCALL 1
56 #endif
58 /* When was `poll' introduced? */
59 #if __LINUX_KERNEL_VERSION >= 131584
60 # define __ASSUME_POLL_SYSCALL 1
61 #endif
63 /* The `lchown' syscall was introduced in 2.1.80. */
64 #if __LINUX_KERNEL_VERSION >= 131408
65 # define __ASSUME_LCHOWN_SYSCALL 1
66 #endif
68 /* When did the `setresuid' sysall became available? */
69 #if __LINUX_KERNEL_VERSION >= 131584 && !defined __sparc__
70 # define __ASSUME_SETRESUID_SYSCALL 1
71 #endif
73 /* The SIOCGIFNAME ioctl is available starting with 2.1.50. */
74 #if __LINUX_KERNEL_VERSION >= 131408
75 # define __ASSUME_SIOCGIFNAME 1
76 #endif
78 /* On x86 another `getrlimit' syscall was added in 2.3.25. */
79 #if __LINUX_KERNEL_VERSION >= 131865 && defined __i386__
80 # define __ASSUME_NEW_GETRLIMIT_SYSCALL 1
81 #endif
83 /* On x86 the truncate64/ftruncate64 syscalls were introduced in 2.3.31. */
84 #if __LINUX_KERNEL_VERSION >= 131871 && defined __i386__
85 # define __ASSUME_TRUNCATE64_SYSCALL 1
86 #endif
88 /* On x86 the mmap2 syscall was introduced in 2.3.31. */
89 #if __LINUX_KERNEL_VERSION >= 131871 && defined __i386__
90 # define __ASSUME_MMAP2_SYSCALL 1
91 #endif
93 /* On x86 the stat64/lstat64/fstat64 syscalls were introduced in 2.3.34. */
94 #if __LINUX_KERNEL_VERSION >= 131874 && defined __i386__
95 # define __ASSUME_STAT64_SYSCALL 1
96 #endif
98 /* On sparc and ARM the truncate64/ftruncate64/mmap2/stat64/lstat64/fstat64
99 syscalls were introduced in 2.3.35. */
100 #if __LINUX_KERNEL_VERSION >= 131875 && (defined __sparc__ || defined __arm__)
101 # define __ASSUME_TRUNCATE64_SYSCALL 1
102 # define __ASSUME_MMAP2_SYSCALL 1
103 # define __ASSUME_STAT64_SYSCALL 1
104 #endif
106 /* I know for sure that getrlimit are in 2.3.35 on powerpc. */
107 #if __LINUX_KERNEL_VERSION >= 131875 && defined __powerpc__
108 # define __ASSUME_NEW_GETRLIMIT_SYSCALL 1
109 #endif
111 /* I know for sure that these are in 2.3.35 on powerpc. But PowerPC64 does not
112 support separate 64-bit syscalls, already 64-bit */
113 #if __LINUX_KERNEL_VERSION >= 131875 && defined __powerpc__ \
114 && !defined __powerpc64__
115 # define __ASSUME_TRUNCATE64_SYSCALL 1
116 # define __ASSUME_STAT64_SYSCALL 1
117 #endif
119 /* Linux 2.3.39 introduced 32bit UID/GIDs. Some platforms had 32
120 bit type all along. */
121 #if __LINUX_KERNEL_VERSION >= 131879 || defined __powerpc__ || defined __mips__
122 # define __ASSUME_32BITUIDS 1
123 #endif
125 /* Linux 2.3.39 sparc added setresuid. */
126 #if __LINUX_KERNEL_VERSION >= 131879 && defined __sparc__
127 # define __ASSUME_SETRESUID_SYSCALL 1
128 #endif
130 #if __LINUX_KERNEL_VERSION >= 131879
131 # define __ASSUME_SETRESGID_SYSCALL 1
132 #endif
134 /* Linux 2.3.39 introduced IPC64. Except for powerpc. */
135 #if __LINUX_KERNEL_VERSION >= 131879 && !defined __powerpc__
136 # define __ASSUME_IPC64 1
137 #endif
139 /* MIPS platforms had IPC64 all along. */
140 #if defined __mips__
141 # define __ASSUME_IPC64 1
142 #endif
144 /* We can use the LDTs for threading with Linux 2.3.99 and newer. */
145 #if __LINUX_KERNEL_VERSION >= 131939
146 # define __ASSUME_LDT_WORKS 1
147 #endif
149 /* Linux 2.4.0 on PPC introduced a correct IPC64. But PowerPC64 does not
150 support a separate 64-bit sys call, already 64-bit */
151 #if __LINUX_KERNEL_VERSION >= 132096 && defined __powerpc__ \
152 && !defined __powerpc64__
153 # define __ASSUME_IPC64 1
154 #endif
156 /* SH kernels got stat64, mmap2, and truncate64 during 2.4.0-test. */
157 #if __LINUX_KERNEL_VERSION >= 132096 && defined __sh__
158 # define __ASSUME_TRUNCATE64_SYSCALL 1
159 # define __ASSUME_MMAP2_SYSCALL 1
160 # define __ASSUME_STAT64_SYSCALL 1
161 #endif
163 /* The changed st_ino field appeared in 2.4.0-test6. But we cannot
164 distinguish this version from other 2.4.0 releases. Therefore play
165 save and assume it available is for 2.4.1 and up. However, SH is lame,
166 and still does not have a 64-bit inode field. */
167 #if __LINUX_KERNEL_VERSION >= 132097 && !defined __alpha__ && !defined __sh__
168 # define __ASSUME_ST_INO_64_BIT 1
169 #endif
171 /* To support locking of large files a new fcntl() syscall was introduced
172 in 2.4.0-test7. We test for 2.4.1 for the earliest version we know
173 the syscall is available. */
174 #if __LINUX_KERNEL_VERSION >= 132097 && (defined __i386__ || defined __sparc__)
175 # define __ASSUME_FCNTL64 1
176 #endif
178 /* The AT_CLKTCK auxiliary vector entry was introduction in the 2.4.0
179 series. */
180 #if __LINUX_KERNEL_VERSION >= 132097
181 # define __ASSUME_AT_CLKTCK 1
182 #endif
184 /* Arm got fcntl64 in 2.4.4, PowerPC and SH have it also in 2.4.4 (I
185 don't know when it got introduced). But PowerPC64 does not support
186 separate FCNTL64 call, FCNTL is already 64-bit */
187 #if __LINUX_KERNEL_VERSION >= 132100 \
188 && (defined __arm__ || defined __powerpc__ || defined __sh__) \
189 && !defined __powerpc64__
190 # define __ASSUME_FCNTL64 1
191 #endif
193 /* The getdents64 syscall was introduced in 2.4.0-test7. We test for
194 2.4.1 for the earliest version we know the syscall is available. */
195 #if __LINUX_KERNEL_VERSION >= 132097
196 # define __ASSUME_GETDENTS64_SYSCALL 1
197 #endif
199 /* When did O_DIRECTORY became available? Early in 2.3 but when?
200 Be safe, use 2.3.99. */
201 #if __LINUX_KERNEL_VERSION >= 131939
202 # define __ASSUME_O_DIRECTORY 1
203 #endif
205 /* Starting with one of the 2.4.0 pre-releases the Linux kernel passes
206 up the page size information. */
207 #if __LINUX_KERNEL_VERSION >= 132097
208 # define __ASSUME_AT_PAGESIZE 1
209 #endif
211 /* Starting with at least 2.4.0 the kernel passes the uid/gid unconditionally
212 up to the child. */
213 #if __LINUX_KERNEL_VERSION >= 132097
214 # define __ASSUME_AT_XID 1
215 #endif
217 /* Starting with 2.4.5 kernels PPC passes the AUXV in the standard way
218 and the vfork syscall made it into the official kernel. */
219 #if __LINUX_KERNEL_VERSION >= (132096+5) && defined __powerpc__
220 # define __ASSUME_STD_AUXV 1
221 # define __ASSUME_VFORK_SYSCALL 1
222 #endif
224 /* Starting with 2.4.5 kernels the mmap2 syscall made it into the official
225 kernel. But PowerPC64 does not support a separate MMAP2 call. */
226 #if __LINUX_KERNEL_VERSION >= (132096+5) && defined __powerpc__ \
227 && !defined __powerpc64__
228 # define __ASSUME_MMAP2_SYSCALL 1
229 #endif
231 /* Starting with 2.4.21 PowerPC implements the new prctl syscall.
232 This allows applications to get/set the Floating Point Exception Mode. */
233 #if __LINUX_KERNEL_VERSION >= (132096+21) && defined __powerpc__
234 # define __ASSUME_NEW_PRCTL_SYSCALL 1
235 #endif
237 /* Starting with 2.4.21 the PowerPC32 clone syscall works as expected. */
238 #if __LINUX_KERNEL_VERSION >= (132096+21) && defined __powerpc__ \
239 && !defined __powerpc64__
240 # define __ASSUME_FIXED_CLONE_SYSCALL 1
241 #endif
243 /* Starting with 2.4.21 PowerPC64 implements the new rt_sigreturn syscall.
244 The new rt_sigreturn takes an ucontext pointer allowing rt_sigreturn
245 to be used in the set/swapcontext implementation. */
246 #if __LINUX_KERNEL_VERSION >= (132096+21) && defined __powerpc64__
247 # define __ASSUME_NEW_RT_SIGRETURN_SYSCALL 1
248 #endif
250 /* On x86, the set_thread_area syscall was introduced in 2.5.29, but its
251 semantics was changed in 2.5.30, and again after 2.5.31. */
252 #if __LINUX_KERNEL_VERSION >= 132384 && defined __i386__
253 # define __ASSUME_SET_THREAD_AREA_SYSCALL 1
254 #endif
256 /* The vfork syscall on x86 and arm was definitely available in 2.4. */
257 #if __LINUX_KERNEL_VERSION >= 132097 && (defined __i386__ || defined __arm__)
258 # define __ASSUME_VFORK_SYSCALL 1
259 #endif
261 /* There are an infinite number of PA-RISC kernel versions numbered
262 2.4.0. But they've not really been released as such. We require
263 and expect the final version here. */
264 #ifdef __hppa__
265 # define __ASSUME_32BITUIDS 1
266 # define __ASSUME_TRUNCATE64_SYSCALL 1
267 # define __ASSUME_MMAP2_SYSCALL 1
268 # define __ASSUME_STAT64_SYSCALL 1
269 # define __ASSUME_IPC64 1
270 # define __ASSUME_ST_INO_64_BIT 1
271 # define __ASSUME_FCNTL64 1
272 # define __ASSUME_GETDENTS64_SYSCALL 1
273 #endif
275 /* Alpha switched to a 64-bit timeval sometime before 2.2.0. */
276 #if __LINUX_KERNEL_VERSION >= 131584 && defined __alpha__
277 # define __ASSUME_TIMEVAL64 1
278 #endif
280 #if defined __mips__ && defined _ABIN32 && _MIPS_SIM == _ABIN32
281 # define __ASSUME_FCNTL64 1
282 #endif
284 /* The late 2.5 kernels saw a lot of new CLONE_* flags. Summarize
285 their availability with one define. The changes were made first
286 for i386 and the have to be done separately for the other archs.
287 For i386 we pick 2.5.50 as the first version with support. */
288 #if __LINUX_KERNEL_VERSION >= 132402 && defined __i386__
289 # define __ASSUME_CLONE_THREAD_FLAGS 1
290 #endif
292 /* These features were surely available with 2.4.12. */
293 #if __LINUX_KERNEL_VERSION >= 132108 && defined __mc68000__
294 # define __ASSUME_MMAP2_SYSCALL 1
295 # define __ASSUME_TRUNCATE64_SYSCALL 1
296 # define __ASSUME_STAT64_SYSCALL 1
297 # define __ASSUME_FCNTL64 1
298 # define __ASSUME_VFORK_SYSCALL 1
299 #endif
301 /* Beginning with 2.5.63 support for realtime and monotonic clocks and
302 timers based on them is available. */
303 #if __LINUX_KERNEL_VERSION >= 132415
304 # define __ASSUME_POSIX_TIMERS 1
305 #endif
307 /* The late 2.5 kernels saw a lot of new CLONE_* flags. Summarize
308 their availability with one define. The changes were made first
309 for i386 and the have to be done separately for the other archs.
310 For ia64, s390*, PPC, x86-64 we pick 2.5.64 as the first version
311 with support. */
312 #if __LINUX_KERNEL_VERSION >= 132416 \
313 && (defined __ia64__ || defined __s390__ || defined __powerpc__ \
314 || defined __x86_64__)
315 # define __ASSUME_CLONE_THREAD_FLAGS 1
316 #endif
318 /* With kernel 2.4.17 we always have netlink support. */
319 #if __LINUX_KERNEL_VERSION >= (132096+17)
320 # define __ASSUME_NETLINK_SUPPORT 1
321 #endif
323 /* The requeue futex functionality was introduced in 2.5.70. */
324 #if __LINUX_KERNEL_VERSION >= 132422
325 # define __ASSUME_FUTEX_REQUEUE 1
326 #endif
328 /* The statfs64 syscalls are available in 2.5.74. */
329 #if __LINUX_KERNEL_VERSION >= 132426
330 # define __ASSUME_STATFS64 1
331 #endif
333 /* Starting with at least 2.5.74 the kernel passes the setuid-like exec
334 flag unconditionally up to the child. */
335 #if __LINUX_KERNEL_VERSION >= 132426
336 # define __ASSUME_AT_SECURE 1
337 #endif
339 /* Starting with the 2.5.75 kernel the kernel fills in the correct value
340 in the si_pid field passed as part of the siginfo_t struct to signal
341 handlers. */
342 #if __LINUX_KERNEL_VERSION >= 132427
343 # define __ASSUME_CORRECT_SI_PID 1
344 #endif
346 /* The tgkill syscall was instroduced for i386 in 2.5.75. For Alpha
347 it was introduced in 2.6.0-test1 which unfortunately cannot be
348 distinguished from 2.6.0. On x86-64 it was introduced in
349 2.6.0-test3. */
350 #if (__LINUX_KERNEL_VERSION >= 132427 && defined __i386__) \
351 || (__LINUX_KERNEL_VERSION >= 132609 && defined __alpha__) \
352 || (__LINUX_KERNEL_VERSION >= 132609 && defined __x86_64__)
353 # define __ASSUME_TGKILL 1
354 #endif
356 /* The utimes syscall has been available for some architectures
357 forever. For x86 it was introduced after 2.5.75, for x86-64 in
358 2.6.0-test3. */
359 #if defined __alpha__ || defined __ia64__ || defined __hppa__ \
360 || defined __sparc__ \
361 || (__LINUX_KERNEL_VERSION > 132427 && defined __i386__) \
362 || (__LINUX_KERNEL_VERSION > 132609 && defined __x86_64__)
363 # define __ASSUME_UTIMES 1
364 #endif
366 /* The CLONE_STOPPED flag was introduced in the 2.6.0-test1 series. */
367 #if __LINUX_KERNEL_VERSION >= 132609
368 # define __ASSUME_CLONE_STOPPED 1
369 #endif
371 /* The fixed version of the posix_fadvise64 syscall appeared in
372 2.6.0-test3. At least for x86. */
373 #if __LINUX_KERNEL_VERSION >= 132609 && defined __i386__
374 # define __ASSUME_FADVISE64_64_SYSCALL 1
375 #endif
377 /* The PROT_GROWSDOWN/PROT_GROWSUP flags were introduced in the 2.6.0-test
378 series. */
379 #if __LINUX_KERNEL_VERSION >= 132609
380 # define __ASSUME_PROT_GROWSUPDOWN 1
381 #endif
383 /* Starting with 2.6.0 PowerPC adds signal/swapcontext support for Vector
384 SIMD (AKA Altivec, VMX) instructions and register state. This changes
385 the overall size of the sigcontext and adds the swapcontext syscall. */
386 #if __LINUX_KERNEL_VERSION >= 132608 && defined __powerpc__
387 # define __ASSUME_SWAPCONTEXT_SYSCALL 1
388 #endif
390 /* The CLONE_DETACHED flag is not necessary in 2.6.2 kernels, it is
391 implied. */
392 #if __LINUX_KERNEL_VERSION >= 132610
393 # define __ASSUME_NO_CLONE_DETACHED 1
394 #endif
396 /* Starting with version 2.6.4-rc1 the getdents syscall returns d_type
397 information as well. */
398 #if __LINUX_KERNEL_VERSION >= 132612
399 # define __ASSUME_GETDENTS32_D_TYPE 1
400 #endif