| blob | f499a712c4bc8448d57fb7ebaf501201cffe73ac |
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 #if defined __mips__
25 # include <sgidefs.h>
26 #endif
28 #ifndef __LINUX_KERNEL_VERSION
29 /* We assume the worst; all kernels should be supported. */
30 # define __LINUX_KERNEL_VERSION 0
31 #endif
33 /* We assume for __LINUX_KERNEL_VERSION the same encoding used in
34 linux/version.h. I.e., the major, minor, and subminor all get a
35 byte with the major number being in the highest byte. This means
36 we can do numeric comparisons.
38 In the following we will define certain symbols depending on
39 whether the describes kernel feature is available in the kernel
40 version given by __LINUX_KERNEL_VERSION. We are not always exactly
41 recording the correct versions in which the features were
42 introduced. If somebody cares these values can afterwards be
43 corrected. Most of the numbers here are set corresponding to
44 2.2.0. */
46 /* `getcwd' system call. */
47 #if __LINUX_KERNEL_VERSION >= 131584
48 # define __ASSUME_GETCWD_SYSCALL 1
49 #endif
51 /* Real-time signal became usable in 2.1.70. */
52 #if __LINUX_KERNEL_VERSION >= 131398
53 # define __ASSUME_REALTIME_SIGNALS 1
54 #endif
56 /* When were the `pread'/`pwrite' syscalls introduced? */
57 #if __LINUX_KERNEL_VERSION >= 131584
58 # define __ASSUME_PREAD_SYSCALL 1
59 # define __ASSUME_PWRITE_SYSCALL 1
60 #endif
62 /* When was `poll' introduced? */
63 #if __LINUX_KERNEL_VERSION >= 131584
64 # define __ASSUME_POLL_SYSCALL 1
65 #endif
67 /* The `lchown' syscall was introduced in 2.1.80. */
68 #if __LINUX_KERNEL_VERSION >= 131408
69 # define __ASSUME_LCHOWN_SYSCALL 1
70 #endif
72 /* When did the `setresuid' sysall became available? */
73 #if __LINUX_KERNEL_VERSION >= 131584 && !defined __sparc__
74 # define __ASSUME_SETRESUID_SYSCALL 1
75 #endif
77 /* The SIOCGIFNAME ioctl is available starting with 2.1.50. */
78 #if __LINUX_KERNEL_VERSION >= 131408
79 # define __ASSUME_SIOCGIFNAME 1
80 #endif
82 /* On x86 another `getrlimit' syscall was added in 2.3.25. */
83 #if __LINUX_KERNEL_VERSION >= 131865 && defined __i386__
84 # define __ASSUME_NEW_GETRLIMIT_SYSCALL 1
85 #endif
87 /* On x86 the truncate64/ftruncate64 syscalls were introduced in 2.3.31. */
88 #if __LINUX_KERNEL_VERSION >= 131871 && defined __i386__
89 # define __ASSUME_TRUNCATE64_SYSCALL 1
90 #endif
92 /* On x86 the mmap2 syscall was introduced in 2.3.31. */
93 #if __LINUX_KERNEL_VERSION >= 131871 && defined __i386__
94 # define __ASSUME_MMAP2_SYSCALL 1
95 #endif
97 /* On x86 the stat64/lstat64/fstat64 syscalls were introduced in 2.3.34. */
98 #if __LINUX_KERNEL_VERSION >= 131874 && defined __i386__
99 # define __ASSUME_STAT64_SYSCALL 1
100 #endif
102 /* On sparc and ARM the truncate64/ftruncate64/mmap2/stat64/lstat64/fstat64
103 syscalls were introduced in 2.3.35. */
104 #if __LINUX_KERNEL_VERSION >= 131875 && (defined __sparc__ || defined __arm__)
105 # define __ASSUME_TRUNCATE64_SYSCALL 1
106 # define __ASSUME_MMAP2_SYSCALL 1
107 # define __ASSUME_STAT64_SYSCALL 1
108 #endif
110 /* I know for sure that getrlimit are in 2.3.35 on powerpc. */
111 #if __LINUX_KERNEL_VERSION >= 131875 && defined __powerpc__
112 # define __ASSUME_NEW_GETRLIMIT_SYSCALL 1
113 #endif
115 /* I know for sure that these are in 2.3.35 on powerpc. But PowerPC64 does not
116 support separate 64-bit syscalls, already 64-bit */
117 #if __LINUX_KERNEL_VERSION >= 131875 && defined __powerpc__ \
118 && !defined __powerpc64__
119 # define __ASSUME_TRUNCATE64_SYSCALL 1
120 # define __ASSUME_STAT64_SYSCALL 1
121 #endif
123 /* Linux 2.3.39 introduced 32bit UID/GIDs. Some platforms had 32
124 bit type all along. */
125 #if __LINUX_KERNEL_VERSION >= 131879 || defined __powerpc__ || defined __mips__
126 # define __ASSUME_32BITUIDS 1
127 #endif
129 /* Linux 2.3.39 sparc added setresuid. */
130 #if __LINUX_KERNEL_VERSION >= 131879 && defined __sparc__
131 # define __ASSUME_SETRESUID_SYSCALL 1
132 #endif
134 #if __LINUX_KERNEL_VERSION >= 131879
135 # define __ASSUME_SETRESGID_SYSCALL 1
136 #endif
138 /* Linux 2.3.39 introduced IPC64. Except for powerpc. */
139 #if __LINUX_KERNEL_VERSION >= 131879 && !defined __powerpc__
140 # define __ASSUME_IPC64 1
141 #endif
143 /* MIPS platforms had IPC64 all along. */
144 #if defined __mips__
145 # define __ASSUME_IPC64 1
146 #endif
148 /* We can use the LDTs for threading with Linux 2.3.99 and newer. */
149 #if __LINUX_KERNEL_VERSION >= 131939
150 # define __ASSUME_LDT_WORKS 1
151 #endif
153 /* Linux 2.4.0 on PPC introduced a correct IPC64. But PowerPC64 does not
154 support a separate 64-bit sys call, already 64-bit */
155 #if __LINUX_KERNEL_VERSION >= 132096 && defined __powerpc__ \
156 && !defined __powerpc64__
157 # define __ASSUME_IPC64 1
158 #endif
160 /* SH kernels got stat64, mmap2, and truncate64 during 2.4.0-test. */
161 #if __LINUX_KERNEL_VERSION >= 132096 && defined __sh__
162 # define __ASSUME_TRUNCATE64_SYSCALL 1
163 # define __ASSUME_MMAP2_SYSCALL 1
164 # define __ASSUME_STAT64_SYSCALL 1
165 #endif
167 /* The changed st_ino field appeared in 2.4.0-test6. But we cannot
168 distinguish this version from other 2.4.0 releases. Therefore play
169 save and assume it available is for 2.4.1 and up. However, SH is lame,
170 and still does not have a 64-bit inode field. */
171 #if __LINUX_KERNEL_VERSION >= 132097 && !defined __alpha__ && !defined __sh__
172 # define __ASSUME_ST_INO_64_BIT 1
173 #endif
175 /* To support locking of large files a new fcntl() syscall was introduced
176 in 2.4.0-test7. We test for 2.4.1 for the earliest version we know
177 the syscall is available. */
178 #if __LINUX_KERNEL_VERSION >= 132097 && (defined __i386__ || defined __sparc__)
179 # define __ASSUME_FCNTL64 1
180 #endif
182 /* The AT_CLKTCK auxiliary vector entry was introduction in the 2.4.0
183 series. */
184 #if __LINUX_KERNEL_VERSION >= 132097
185 # define __ASSUME_AT_CLKTCK 1
186 #endif
188 /* Arm got fcntl64 in 2.4.4, PowerPC and SH have it also in 2.4.4 (I
189 don't know when it got introduced). But PowerPC64 does not support
190 separate FCNTL64 call, FCNTL is already 64-bit */
191 #if __LINUX_KERNEL_VERSION >= 132100 \
192 && (defined __arm__ || defined __powerpc__ || defined __sh__) \
193 && !defined __powerpc64__
194 # define __ASSUME_FCNTL64 1
195 #endif
197 /* The getdents64 syscall was introduced in 2.4.0-test7. We test for
198 2.4.1 for the earliest version we know the syscall is available. */
199 #if __LINUX_KERNEL_VERSION >= 132097
200 # define __ASSUME_GETDENTS64_SYSCALL 1
201 #endif
203 /* When did O_DIRECTORY became available? Early in 2.3 but when?
204 Be safe, use 2.3.99. */
205 #if __LINUX_KERNEL_VERSION >= 131939
206 # define __ASSUME_O_DIRECTORY 1
207 #endif
209 /* Starting with one of the 2.4.0 pre-releases the Linux kernel passes
210 up the page size information. */
211 #if __LINUX_KERNEL_VERSION >= 132097
212 # define __ASSUME_AT_PAGESIZE 1
213 #endif
215 /* Starting with at least 2.4.0 the kernel passes the uid/gid unconditionally
216 up to the child. */
217 #if __LINUX_KERNEL_VERSION >= 132097
218 # define __ASSUME_AT_XID 1
219 #endif
221 /* Starting with 2.4.5 kernels PPC passes the AUXV in the standard way
222 and the vfork syscall made it into the official kernel. */
223 #if __LINUX_KERNEL_VERSION >= (132096+5) && defined __powerpc__
224 # define __ASSUME_STD_AUXV 1
225 # define __ASSUME_VFORK_SYSCALL 1
226 #endif
228 /* Starting with 2.4.5 kernels the mmap2 syscall made it into the official
229 kernel. But PowerPC64 does not support a separate MMAP2 call. */
230 #if __LINUX_KERNEL_VERSION >= (132096+5) && defined __powerpc__ \
231 && !defined __powerpc64__
232 # define __ASSUME_MMAP2_SYSCALL 1
233 #endif
235 /* Starting with 2.4.21 PowerPC implements the new prctl syscall.
236 This allows applications to get/set the Floating Point Exception Mode. */
237 #if __LINUX_KERNEL_VERSION >= (132096+21) && defined __powerpc__
238 # define __ASSUME_NEW_PRCTL_SYSCALL 1
239 #endif
241 /* Starting with 2.4.21 the PowerPC32 clone syscall works as expected. */
242 #if __LINUX_KERNEL_VERSION >= (132096+21) && defined __powerpc__ \
243 && !defined __powerpc64__
244 # define __ASSUME_FIXED_CLONE_SYSCALL 1
245 #endif
247 /* Starting with 2.4.21 PowerPC64 implements the new rt_sigreturn syscall.
248 The new rt_sigreturn takes an ucontext pointer allowing rt_sigreturn
249 to be used in the set/swapcontext implementation. */
250 #if __LINUX_KERNEL_VERSION >= (132096+21) && defined __powerpc64__
251 # define __ASSUME_NEW_RT_SIGRETURN_SYSCALL 1
252 #endif
254 /* On x86, the set_thread_area syscall was introduced in 2.5.29, but its
255 semantics was changed in 2.5.30, and again after 2.5.31. */
256 #if __LINUX_KERNEL_VERSION >= 132384 && defined __i386__
257 # define __ASSUME_SET_THREAD_AREA_SYSCALL 1
258 #endif
260 /* The vfork syscall on x86 and arm was definitely available in 2.4. */
261 #if __LINUX_KERNEL_VERSION >= 132097 && (defined __i386__ || defined __arm__)
262 # define __ASSUME_VFORK_SYSCALL 1
263 #endif
265 /* There are an infinite number of PA-RISC kernel versions numbered
266 2.4.0. But they've not really been released as such. We require
267 and expect the final version here. */
268 #ifdef __hppa__
269 # define __ASSUME_32BITUIDS 1
270 # define __ASSUME_TRUNCATE64_SYSCALL 1
271 # define __ASSUME_MMAP2_SYSCALL 1
272 # define __ASSUME_STAT64_SYSCALL 1
273 # define __ASSUME_IPC64 1
274 # define __ASSUME_ST_INO_64_BIT 1
275 # define __ASSUME_FCNTL64 1
276 # define __ASSUME_GETDENTS64_SYSCALL 1
277 #endif
279 /* Alpha switched to a 64-bit timeval sometime before 2.2.0. */
280 #if __LINUX_KERNEL_VERSION >= 131584 && defined __alpha__
281 # define __ASSUME_TIMEVAL64 1
282 #endif
284 #if defined __mips__ && _MIPS_SIM == _ABIN32
285 # define __ASSUME_FCNTL64 1
286 #endif
288 /* The late 2.5 kernels saw a lot of new CLONE_* flags. Summarize
289 their availability with one define. The changes were made first
290 for i386 and the have to be done separately for the other archs.
291 For i386 we pick 2.5.50 as the first version with support. */
292 #if __LINUX_KERNEL_VERSION >= 132402 && defined __i386__
293 # define __ASSUME_CLONE_THREAD_FLAGS 1
294 #endif
296 /* These features were surely available with 2.4.12. */
297 #if __LINUX_KERNEL_VERSION >= 132108 && defined __mc68000__
298 # define __ASSUME_MMAP2_SYSCALL 1
299 # define __ASSUME_TRUNCATE64_SYSCALL 1
300 # define __ASSUME_STAT64_SYSCALL 1
301 # define __ASSUME_FCNTL64 1
302 # define __ASSUME_VFORK_SYSCALL 1
303 #endif
305 /* Beginning with 2.5.63 support for realtime and monotonic clocks and
306 timers based on them is available. */
307 #if __LINUX_KERNEL_VERSION >= 132415
308 # define __ASSUME_POSIX_TIMERS 1
309 #endif
311 /* The late 2.5 kernels saw a lot of new CLONE_* flags. Summarize
312 their availability with one define. The changes were made first
313 for i386 and the have to be done separately for the other archs.
314 For ia64, s390*, PPC, x86-64 we pick 2.5.64 as the first version
315 with support. */
316 #if __LINUX_KERNEL_VERSION >= 132416 \
317 && (defined __ia64__ || defined __s390__ || defined __powerpc__ \
318 || defined __x86_64__ || defined __sh__)
319 # define __ASSUME_CLONE_THREAD_FLAGS 1
320 #endif
322 /* With kernel 2.4.17 we always have netlink support. */
323 #if __LINUX_KERNEL_VERSION >= (132096+17)
324 # define __ASSUME_NETLINK_SUPPORT 1
325 #endif
327 /* The requeue futex functionality was introduced in 2.5.70. */
328 #if __LINUX_KERNEL_VERSION >= 132422
329 # define __ASSUME_FUTEX_REQUEUE 1
330 #endif
332 /* The statfs64 syscalls are available in 2.5.74. */
333 #if __LINUX_KERNEL_VERSION >= 132426
334 # define __ASSUME_STATFS64 1
335 #endif
337 /* Starting with at least 2.5.74 the kernel passes the setuid-like exec
338 flag unconditionally up to the child. */
339 #if __LINUX_KERNEL_VERSION >= 132426
340 # define __ASSUME_AT_SECURE 1
341 #endif
343 /* Starting with the 2.5.75 kernel the kernel fills in the correct value
344 in the si_pid field passed as part of the siginfo_t struct to signal
345 handlers. */
346 #if __LINUX_KERNEL_VERSION >= 132427
347 # define __ASSUME_CORRECT_SI_PID 1
348 #endif
350 /* The tgkill syscall was instroduced for i386 in 2.5.75. For Alpha
351 it was introduced in 2.6.0-test1 which unfortunately cannot be
352 distinguished from 2.6.0. On x86-64 it was introduced in
353 2.6.0-test3. */
354 #if (__LINUX_KERNEL_VERSION >= 132427 && defined __i386__) \
355 || (__LINUX_KERNEL_VERSION >= 132609 && defined __alpha__) \
356 || (__LINUX_KERNEL_VERSION >= 132609 && defined __x86_64__) \
357 || (__LINUX_KERNEL_VERSION >= 132609 && defined __sh__)
358 # define __ASSUME_TGKILL 1
359 #endif
361 /* The utimes syscall has been available for some architectures
362 forever. For x86 it was introduced after 2.5.75, for x86-64 in
363 2.6.0-test3. */
364 #if defined __alpha__ || defined __ia64__ || defined __hppa__ \
365 || defined __sparc__ \
366 || (__LINUX_KERNEL_VERSION > 132427 && defined __i386__) \
367 || (__LINUX_KERNEL_VERSION > 132609 && defined __x86_64__) \
368 || (__LINUX_KERNEL_VERSION >= 132609 && defined __sh__)
369 # define __ASSUME_UTIMES 1
370 #endif
372 // XXX Disabled for now since the semantics we want is not achieved.
373 #if 0
374 /* The CLONE_STOPPED flag was introduced in the 2.6.0-test1 series. */
375 #if __LINUX_KERNEL_VERSION >= 132609
376 # define __ASSUME_CLONE_STOPPED 1
377 #endif
378 #endif
380 /* The fixed version of the posix_fadvise64 syscall appeared in
381 2.6.0-test3. At least for x86. */
382 #if __LINUX_KERNEL_VERSION >= 132609 && defined __i386__
383 # define __ASSUME_FADVISE64_64_SYSCALL 1
384 #endif
386 /* The PROT_GROWSDOWN/PROT_GROWSUP flags were introduced in the 2.6.0-test
387 series. */
388 #if __LINUX_KERNEL_VERSION >= 132609
389 # define __ASSUME_PROT_GROWSUPDOWN 1
390 #endif
392 /* Starting with 2.6.0 PowerPC adds signal/swapcontext support for Vector
393 SIMD (AKA Altivec, VMX) instructions and register state. This changes
394 the overall size of the sigcontext and adds the swapcontext syscall. */
395 #if __LINUX_KERNEL_VERSION >= 132608 && defined __powerpc__
396 # define __ASSUME_SWAPCONTEXT_SYSCALL 1
397 #endif
399 /* The CLONE_DETACHED flag is not necessary in 2.6.2 kernels, it is
400 implied. */
401 #if __LINUX_KERNEL_VERSION >= 132610
402 # define __ASSUME_NO_CLONE_DETACHED 1
403 #endif
405 /* Starting with version 2.6.4-rc1 the getdents syscall returns d_type
406 information as well. */
407 #if __LINUX_KERNEL_VERSION >= 132612
408 # define __ASSUME_GETDENTS32_D_TYPE 1
409 #endif
411 /* Starting with version 2.5.3, the initial location returned by `brk'
412 after exec is always rounded up to the next page. */
413 #if __LINUX_KERNEL_VERSION >= 132355
414 # define __ASSUME_BRK_PAGE_ROUNDED 1
415 #endif
417 /* Starting with version 2.6.9, the waitid system call is available. */
418 #if __LINUX_KERNEL_VERSION >= 0x020609
419 # define __ASSUME_WAITID_SYSCALL 1
420 #endif
422 /* Starting with version 2.6.9, SSI_IEEE_RAISE_EXCEPTION exists. */
423 #if __LINUX_KERNEL_VERSION >= 0x020609 && defined __alpha__
424 #define __ASSUME_IEEE_RAISE_EXCEPTION 1
425 #endif