| blob | 888819a4558e94a46f0b77c2e4f3694e06080d90 |
1 /* Set flags signalling availability of kernel features based on given
2 kernel version number.
3 Copyright (C) 1999-2003, 2004, 2005, 2006 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 /* MSG_NOSIGNAL was at least available with Linux 2.2.0. */
79 #if __LINUX_KERNEL_VERSION >= 131584
80 # define __ASSUME_MSG_NOSIGNAL 1
81 #endif
83 /* The sendfile syscall was introduced in 2.2.0. */
84 #if __LINUX_KERNEL_VERSION >= 131584
85 # define __ASSUME_SENDFILE 1
86 #endif
88 /* On x86 another `getrlimit' syscall was added in 2.3.25. */
89 #if __LINUX_KERNEL_VERSION >= 131865 && defined __i386__
90 # define __ASSUME_NEW_GETRLIMIT_SYSCALL 1
91 #endif
93 /* On x86 the truncate64/ftruncate64 syscalls were introduced in 2.3.31. */
94 #if __LINUX_KERNEL_VERSION >= 131871 && defined __i386__
95 # define __ASSUME_TRUNCATE64_SYSCALL 1
96 #endif
98 /* On x86 the mmap2 syscall was introduced in 2.3.31. */
99 #if __LINUX_KERNEL_VERSION >= 131871 && defined __i386__
100 # define __ASSUME_MMAP2_SYSCALL 1
101 #endif
103 /* On x86 the stat64/lstat64/fstat64 syscalls were introduced in 2.3.34. */
104 #if __LINUX_KERNEL_VERSION >= 131874 && defined __i386__
105 # define __ASSUME_STAT64_SYSCALL 1
106 #endif
108 /* On sparc and ARM the truncate64/ftruncate64/mmap2/stat64/lstat64/fstat64
109 syscalls were introduced in 2.3.35. */
110 #if __LINUX_KERNEL_VERSION >= 131875 \
111 && ((defined __sparc__ && !defined __arch64__) || defined __arm__)
112 # define __ASSUME_TRUNCATE64_SYSCALL 1
113 # define __ASSUME_MMAP2_SYSCALL 1
114 # define __ASSUME_STAT64_SYSCALL 1
115 #endif
117 /* I know for sure that getrlimit are in 2.3.35 on powerpc. */
118 #if __LINUX_KERNEL_VERSION >= 131875 && defined __powerpc__
119 # define __ASSUME_NEW_GETRLIMIT_SYSCALL 1
120 #endif
122 /* I know for sure that these are in 2.3.35 on powerpc. But PowerPC64 does not
123 support separate 64-bit syscalls, already 64-bit */
124 #if __LINUX_KERNEL_VERSION >= 131875 && defined __powerpc__ \
125 && !defined __powerpc64__
126 # define __ASSUME_TRUNCATE64_SYSCALL 1
127 # define __ASSUME_STAT64_SYSCALL 1
128 #endif
130 /* Linux 2.3.39 introduced 32bit UID/GIDs. Some platforms had 32
131 bit type all along. */
132 #if __LINUX_KERNEL_VERSION >= 131879 || defined __powerpc__
133 # define __ASSUME_32BITUIDS 1
134 #endif
136 /* Linux 2.3.39 sparc added setresuid. */
137 #if __LINUX_KERNEL_VERSION >= 131879 && defined __sparc__
138 # define __ASSUME_SETRESUID_SYSCALL 1
139 #endif
141 #if __LINUX_KERNEL_VERSION >= 131879
142 # define __ASSUME_SETRESGID_SYSCALL 1
143 #endif
145 /* Linux 2.3.39 introduced IPC64. Except for powerpc. */
146 #if __LINUX_KERNEL_VERSION >= 131879 && !defined __powerpc__
147 # define __ASSUME_IPC64 1
148 #endif
150 /* We can use the LDTs for threading with Linux 2.3.99 and newer. */
151 #if __LINUX_KERNEL_VERSION >= 131939
152 # define __ASSUME_LDT_WORKS 1
153 #endif
155 /* Linux 2.4.0 on PPC introduced a correct IPC64. But PowerPC64 does not
156 support a separate 64-bit sys call, already 64-bit */
157 #if __LINUX_KERNEL_VERSION >= 132096 && defined __powerpc__ \
158 && !defined __powerpc64__
159 # define __ASSUME_IPC64 1
160 #endif
162 /* SH kernels got stat64, mmap2, and truncate64 during 2.4.0-test. */
163 #if __LINUX_KERNEL_VERSION >= 132096 && defined __sh__
164 # define __ASSUME_TRUNCATE64_SYSCALL 1
165 # define __ASSUME_MMAP2_SYSCALL 1
166 # define __ASSUME_STAT64_SYSCALL 1
167 #endif
169 /* The changed st_ino field appeared in 2.4.0-test6. But we cannot
170 distinguish this version from other 2.4.0 releases. Therefore play
171 save and assume it available is for 2.4.1 and up. However, SH is lame,
172 and still does not have a 64-bit inode field. */
173 #if __LINUX_KERNEL_VERSION >= 132097 && !defined __alpha__ && !defined __sh__
174 # define __ASSUME_ST_INO_64_BIT 1
175 #endif
177 /* To support locking of large files a new fcntl() syscall was introduced
178 in 2.4.0-test7. We test for 2.4.1 for the earliest version we know
179 the syscall is available. */
180 #if __LINUX_KERNEL_VERSION >= 132097 && (defined __i386__ || defined __sparc__)
181 # define __ASSUME_FCNTL64 1
182 #endif
184 /* The AT_CLKTCK auxiliary vector entry was introduction in the 2.4.0
185 series. */
186 #if __LINUX_KERNEL_VERSION >= 132097
187 # define __ASSUME_AT_CLKTCK 1
188 #endif
190 /* Arm got fcntl64 in 2.4.4, PowerPC and SH have it also in 2.4.4 (I
191 don't know when it got introduced). But PowerPC64 does not support
192 separate FCNTL64 call, FCNTL is already 64-bit */
193 #if __LINUX_KERNEL_VERSION >= 132100 \
194 && (defined __arm__ || defined __powerpc__ || defined __sh__) \
195 && !defined __powerpc64__
196 # define __ASSUME_FCNTL64 1
197 #endif
199 /* The getdents64 syscall was introduced in 2.4.0-test7. We test for
200 2.4.1 for the earliest version we know the syscall is available. */
201 #if __LINUX_KERNEL_VERSION >= 132097
202 # define __ASSUME_GETDENTS64_SYSCALL 1
203 #endif
205 /* When did O_DIRECTORY became available? Early in 2.3 but when?
206 Be safe, use 2.3.99. */
207 #if __LINUX_KERNEL_VERSION >= 131939
208 # define __ASSUME_O_DIRECTORY 1
209 #endif
211 /* Starting with one of the 2.4.0 pre-releases the Linux kernel passes
212 up the page size information. */
213 #if __LINUX_KERNEL_VERSION >= 132097
214 # define __ASSUME_AT_PAGESIZE 1
215 #endif
217 /* Starting with at least 2.4.0 the kernel passes the uid/gid unconditionally
218 up to the child. */
219 #if __LINUX_KERNEL_VERSION >= 132097
220 # define __ASSUME_AT_XID 1
221 #endif
223 /* Starting with 2.4.5 kernels PPC passes the AUXV in the standard way
224 and the vfork syscall made it into the official kernel. */
225 #if __LINUX_KERNEL_VERSION >= (132096+5) && defined __powerpc__
226 # define __ASSUME_STD_AUXV 1
227 # define __ASSUME_VFORK_SYSCALL 1
228 #endif
230 /* Starting with 2.4.5 kernels the mmap2 syscall made it into the official
231 kernel. But PowerPC64 does not support a separate MMAP2 call. */
232 #if __LINUX_KERNEL_VERSION >= (132096+5) && defined __powerpc__ \
233 && !defined __powerpc64__
234 # define __ASSUME_MMAP2_SYSCALL 1
235 #endif
237 /* Starting with 2.4.21 PowerPC implements the new prctl syscall.
238 This allows applications to get/set the Floating Point Exception Mode. */
239 #if __LINUX_KERNEL_VERSION >= (132096+21) && defined __powerpc__
240 # define __ASSUME_NEW_PRCTL_SYSCALL 1
241 #endif
243 /* Starting with 2.4.21 the PowerPC32 clone syscall works as expected. */
244 #if __LINUX_KERNEL_VERSION >= (132096+21) && defined __powerpc__ \
245 && !defined __powerpc64__
246 # define __ASSUME_FIXED_CLONE_SYSCALL 1
247 #endif
249 /* Starting with 2.4.21 PowerPC64 implements the new rt_sigreturn syscall.
250 The new rt_sigreturn takes an ucontext pointer allowing rt_sigreturn
251 to be used in the set/swapcontext implementation. */
252 #if __LINUX_KERNEL_VERSION >= (132096+21) && defined __powerpc64__
253 # define __ASSUME_NEW_RT_SIGRETURN_SYSCALL 1
254 #endif
256 /* On x86, the set_thread_area syscall was introduced in 2.5.29, but its
257 semantics was changed in 2.5.30, and again after 2.5.31. */
258 #if __LINUX_KERNEL_VERSION >= 132384 && defined __i386__
259 # define __ASSUME_SET_THREAD_AREA_SYSCALL 1
260 #endif
262 /* The vfork syscall on x86 and arm was definitely available in 2.4. */
263 #if __LINUX_KERNEL_VERSION >= 132097 && (defined __i386__ || defined __arm__)
264 # define __ASSUME_VFORK_SYSCALL 1
265 #endif
267 /* There are an infinite number of PA-RISC kernel versions numbered
268 2.4.0. But they've not really been released as such. We require
269 and expect the final version here. */
270 #ifdef __hppa__
271 # define __ASSUME_32BITUIDS 1
272 # define __ASSUME_TRUNCATE64_SYSCALL 1
273 # define __ASSUME_MMAP2_SYSCALL 1
274 # define __ASSUME_STAT64_SYSCALL 1
275 # define __ASSUME_IPC64 1
276 # define __ASSUME_ST_INO_64_BIT 1
277 # define __ASSUME_FCNTL64 1
278 # define __ASSUME_GETDENTS64_SYSCALL 1
279 #endif
281 /* Alpha switched to a 64-bit timeval sometime before 2.2.0. */
282 #if __LINUX_KERNEL_VERSION >= 131584 && defined __alpha__
283 # define __ASSUME_TIMEVAL64 1
284 #endif
286 /* The late 2.5 kernels saw a lot of new CLONE_* flags. Summarize
287 their availability with one define. The changes were made first
288 for i386 and the have to be done separately for the other archs.
289 For i386 we pick 2.5.50 as the first version with support. */
290 #if __LINUX_KERNEL_VERSION >= 132402 && defined __i386__
291 # define __ASSUME_CLONE_THREAD_FLAGS 1
292 #endif
294 /* These features were surely available with 2.4.12. */
295 #if __LINUX_KERNEL_VERSION >= 132108 && defined __mc68000__
296 # define __ASSUME_MMAP2_SYSCALL 1
297 # define __ASSUME_TRUNCATE64_SYSCALL 1
298 # define __ASSUME_STAT64_SYSCALL 1
299 # define __ASSUME_FCNTL64 1
300 # define __ASSUME_VFORK_SYSCALL 1
301 #endif
303 /* Beginning with 2.5.63 support for realtime and monotonic clocks and
304 timers based on them is available. */
305 #if __LINUX_KERNEL_VERSION >= 132415
306 # define __ASSUME_POSIX_TIMERS 1
307 #endif
309 /* Beginning with 2.6.12 the clock and timer supports CPU clocks. */
310 #if __LINUX_KERNEL_VERSION >= 0x2060c
311 # define __ASSUME_POSIX_CPU_TIMERS 1
312 #endif
314 /* The late 2.5 kernels saw a lot of new CLONE_* flags. Summarize
315 their availability with one define. The changes were made first
316 for i386 and the have to be done separately for the other archs.
317 For ia64, s390*, PPC, x86-64 we pick 2.5.64 as the first version
318 with support. */
319 #if __LINUX_KERNEL_VERSION >= 132416 \
320 && (defined __ia64__ || defined __s390__ || defined __powerpc__ \
321 || defined __x86_64__ || defined __sh__)
322 # define __ASSUME_CLONE_THREAD_FLAGS 1
323 #endif
325 /* With kernel 2.4.17 we always have netlink support. */
326 #if __LINUX_KERNEL_VERSION >= (132096+17)
327 # define __ASSUME_NETLINK_SUPPORT 1
328 #endif
330 /* The requeue futex functionality was introduced in 2.5.70. */
331 #if __LINUX_KERNEL_VERSION >= 132422
332 # define __ASSUME_FUTEX_REQUEUE 1
333 #endif
335 /* The statfs64 syscalls are available in 2.5.74. */
336 #if __LINUX_KERNEL_VERSION >= 132426
337 # define __ASSUME_STATFS64 1
338 #endif
340 /* Starting with at least 2.5.74 the kernel passes the setuid-like exec
341 flag unconditionally up to the child. */
342 #if __LINUX_KERNEL_VERSION >= 132426
343 # define __ASSUME_AT_SECURE 1
344 #endif
346 /* Starting with the 2.5.75 kernel the kernel fills in the correct value
347 in the si_pid field passed as part of the siginfo_t struct to signal
348 handlers. */
349 #if __LINUX_KERNEL_VERSION >= 132427
350 # define __ASSUME_CORRECT_SI_PID 1
351 #endif
353 /* The tgkill syscall was instroduced for i386 in 2.5.75. For Alpha
354 it was introduced in 2.6.0-test1 which unfortunately cannot be
355 distinguished from 2.6.0. On x86-64, ppc, and ppc64 it was
356 introduced in 2.6.0-test3. */
357 #if (__LINUX_KERNEL_VERSION >= 132427 && defined __i386__) \
358 || (__LINUX_KERNEL_VERSION >= 132609 && defined __alpha__) \
359 || (__LINUX_KERNEL_VERSION >= 132609 && defined __x86_64__) \
360 || (__LINUX_KERNEL_VERSION >= 132609 && defined __powerpc__) \
361 || (__LINUX_KERNEL_VERSION >= 132609 && defined __sh__)
362 # define __ASSUME_TGKILL 1
363 #endif
365 /* The utimes syscall has been available for some architectures
366 forever. For x86 it was introduced after 2.5.75, for x86-64,
367 ppc, and ppc64 it was introduced in 2.6.0-test3. */
368 #if defined __alpha__ || defined __ia64__ || defined __hppa__ \
369 || defined __sparc__ \
370 || (__LINUX_KERNEL_VERSION > 132427 && defined __i386__) \
371 || (__LINUX_KERNEL_VERSION > 132609 && defined __x86_64__) \
372 || (__LINUX_KERNEL_VERSION >= 132609 && defined __powerpc__) \
373 || (__LINUX_KERNEL_VERSION >= 132609 && defined __sh__)
374 # define __ASSUME_UTIMES 1
375 #endif
377 // XXX Disabled for now since the semantics we want is not achieved.
378 #if 0
379 /* The CLONE_STOPPED flag was introduced in the 2.6.0-test1 series. */
380 #if __LINUX_KERNEL_VERSION >= 132609
381 # define __ASSUME_CLONE_STOPPED 1
382 #endif
383 #endif
385 /* The fixed version of the posix_fadvise64 syscall appeared in
386 2.6.0-test3. At least for x86. Powerpc support appeared in
387 2.6.2, but for 32-bit userspace only. */
388 #if (__LINUX_KERNEL_VERSION >= 132609 && defined __i386__) \
389 || (__LINUX_KERNEL_VERSION >= 132610 && defined __powerpc__ \
390 && !defined __powerpc64__)
391 # define __ASSUME_FADVISE64_64_SYSCALL 1
392 #endif
394 /* The PROT_GROWSDOWN/PROT_GROWSUP flags were introduced in the 2.6.0-test
395 series. */
396 #if __LINUX_KERNEL_VERSION >= 132609
397 # define __ASSUME_PROT_GROWSUPDOWN 1
398 #endif
400 /* Starting with 2.6.0 PowerPC adds signal/swapcontext support for Vector
401 SIMD (AKA Altivec, VMX) instructions and register state. This changes
402 the overall size of the sigcontext and adds the swapcontext syscall. */
403 #if __LINUX_KERNEL_VERSION >= 132608 && defined __powerpc__
404 # define __ASSUME_SWAPCONTEXT_SYSCALL 1
405 #endif
407 /* The CLONE_DETACHED flag is not necessary in 2.6.2 kernels, it is
408 implied. */
409 #if __LINUX_KERNEL_VERSION >= 132610
410 # define __ASSUME_NO_CLONE_DETACHED 1
411 #endif
413 /* Starting with version 2.6.4-rc1 the getdents syscall returns d_type
414 information as well and in between 2.6.5 and 2.6.8 most compat wrappers
415 were fixed too. Except s390{,x} which was fixed in 2.6.11. */
416 #if (__LINUX_KERNEL_VERSION >= 0x020608 && !defined __s390__) \
417 || (__LINUX_KERNEL_VERSION >= 0x02060b && defined __s390__)
418 # define __ASSUME_GETDENTS32_D_TYPE 1
419 #endif
421 /* Starting with version 2.5.3, the initial location returned by `brk'
422 after exec is always rounded up to the next page. */
423 #if __LINUX_KERNEL_VERSION >= 132355
424 # define __ASSUME_BRK_PAGE_ROUNDED 1
425 #endif
427 /* Starting with version 2.6.9, the waitid system call is available.
428 Except for powerpc{,64} and s390{,x}, where it is available in 2.6.12. */
429 #if (__LINUX_KERNEL_VERSION >= 0x020609 \
430 && !defined __powerpc__ && !defined __s390__) \
431 || (__LINUX_KERNEL_VERSION >= 0x02060c \
432 && (defined __powerpc__ || defined __s390__))
433 # define __ASSUME_WAITID_SYSCALL 1
434 #endif
436 /* Starting with version 2.6.9, SSI_IEEE_RAISE_EXCEPTION exists. */
437 #if __LINUX_KERNEL_VERSION >= 0x020609 && defined __alpha__
438 #define __ASSUME_IEEE_RAISE_EXCEPTION 1
439 #endif
441 /* On sparc64 stat64/lstat64/fstat64 syscalls were introduced in 2.6.12. */
442 #if __LINUX_KERNEL_VERSION >= 0x02060c && defined __sparc__ \
443 && defined __arch64__
444 # define __ASSUME_STAT64_SYSCALL 1
445 #endif
447 /* Early kernel used "shm" as the filesystem name for the filesystem used
448 for shm_open etc. Later it is "tmpfs". 2.4.20 is a safe bet for the
449 cutover. */
450 #if __LINUX_KERNEL_VERSION >= 0x02041a
451 # define __ASSUME_TMPFS_NAME 1
452 #endif
454 /* pselect was introduced just after 2.6.16-rc1. Due to the way the
455 kernel versions are advertised we can only rely on 2.6.17 to have
456 the code. */
457 #if __LINUX_KERNEL_VERSION >= 0x020611 \
458 && (defined __i386__ || defined __powerpc__)
459 # define __ASSUME_PSELECT 1
460 #endif
462 /* ppoll was introduced just after 2.6.16-rc1. Due to the way the
463 kernel versions are advertised we can only rely on 2.6.17 to have
464 the code. */
465 #if __LINUX_KERNEL_VERSION >= 0x020611 \
466 && (defined __i386__ || defined __powerpc__)
467 # define __ASSUME_PPOLL 1
468 #endif
470 /* The *at syscalls were introduced just after 2.6.16-rc1. Due to the way the
471 kernel versions are advertised we can only rely on 2.6.17 to have
472 the code. */
473 #if __LINUX_KERNEL_VERSION >= 0x020611 \
474 && (defined __i386__ || defined __x86_64__)
475 # define __ASSUME_ATFCTS 1
476 #endif