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sourceware.org Git - glibc.git/blob - sysdeps/unix/sysv/linux/kernel-features.h
1 /* Set flags signalling availability of kernel features based on given
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
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. */
28 #ifndef __LINUX_KERNEL_VERSION
29 /* We assume the worst; all kernels should be supported. */
30 # define __LINUX_KERNEL_VERSION 0
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
46 /* `getcwd' system call. */
47 #if __LINUX_KERNEL_VERSION >= 131584
48 # define __ASSUME_GETCWD_SYSCALL 1
51 /* Real-time signal became usable in 2.1.70. */
52 #if __LINUX_KERNEL_VERSION >= 131398
53 # define __ASSUME_REALTIME_SIGNALS 1
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
62 /* When was `poll' introduced? */
63 #if __LINUX_KERNEL_VERSION >= 131584
64 # define __ASSUME_POLL_SYSCALL 1
67 /* The `lchown' syscall was introduced in 2.1.80. */
68 #if __LINUX_KERNEL_VERSION >= 131408
69 # define __ASSUME_LCHOWN_SYSCALL 1
72 /* When did the `setresuid' sysall became available? */
73 #if __LINUX_KERNEL_VERSION >= 131584 && !defined __sparc__
74 # define __ASSUME_SETRESUID_SYSCALL 1
77 /* The SIOCGIFNAME ioctl is available starting with 2.1.50. */
78 #if __LINUX_KERNEL_VERSION >= 131408
79 # define __ASSUME_SIOCGIFNAME 1
82 /* MSG_NOSIGNAL was at least available with Linux 2.2.0. */
83 #if __LINUX_KERNEL_VERSION >= 131584
84 # define __ASSUME_MSG_NOSIGNAL 1
87 /* The sendfile syscall was introduced in 2.2.0. */
88 #if __LINUX_KERNEL_VERSION >= 131584
89 # define __ASSUME_SENDFILE 1
92 /* On x86 another `getrlimit' syscall was added in 2.3.25. */
93 #if __LINUX_KERNEL_VERSION >= 131865 && defined __i386__
94 # define __ASSUME_NEW_GETRLIMIT_SYSCALL 1
97 /* On x86 the truncate64/ftruncate64 syscalls were introduced in 2.3.31. */
98 #if __LINUX_KERNEL_VERSION >= 131871 && defined __i386__
99 # define __ASSUME_TRUNCATE64_SYSCALL 1
102 /* On x86 the mmap2 syscall was introduced in 2.3.31. */
103 #if __LINUX_KERNEL_VERSION >= 131871 && defined __i386__
104 # define __ASSUME_MMAP2_SYSCALL 1
107 /* On x86 the stat64/lstat64/fstat64 syscalls were introduced in 2.3.34. */
108 #if __LINUX_KERNEL_VERSION >= 131874 && defined __i386__
109 # define __ASSUME_STAT64_SYSCALL 1
112 /* On sparc and ARM the truncate64/ftruncate64/mmap2/stat64/lstat64/fstat64
113 syscalls were introduced in 2.3.35. */
114 #if __LINUX_KERNEL_VERSION >= 131875 \
115 && ((defined __sparc__ && !defined __arch64__) || defined __arm__)
116 # define __ASSUME_TRUNCATE64_SYSCALL 1
117 # define __ASSUME_MMAP2_SYSCALL 1
118 # define __ASSUME_STAT64_SYSCALL 1
121 /* I know for sure that getrlimit are in 2.3.35 on powerpc. */
122 #if __LINUX_KERNEL_VERSION >= 131875 && defined __powerpc__
123 # define __ASSUME_NEW_GETRLIMIT_SYSCALL 1
126 /* I know for sure that these are in 2.3.35 on powerpc. But PowerPC64 does not
127 support separate 64-bit syscalls, already 64-bit */
128 #if __LINUX_KERNEL_VERSION >= 131875 && defined __powerpc__ \
129 && !defined __powerpc64__
130 # define __ASSUME_TRUNCATE64_SYSCALL 1
131 # define __ASSUME_STAT64_SYSCALL 1
134 /* Linux 2.3.39 introduced 32bit UID/GIDs. Some platforms had 32
135 bit type all along. */
136 #if __LINUX_KERNEL_VERSION >= 131879 || defined __powerpc__ || defined __mips__
137 # define __ASSUME_32BITUIDS 1
140 /* Linux 2.3.39 sparc added setresuid. */
141 #if __LINUX_KERNEL_VERSION >= 131879 && defined __sparc__
142 # define __ASSUME_SETRESUID_SYSCALL 1
145 #if __LINUX_KERNEL_VERSION >= 131879
146 # define __ASSUME_SETRESGID_SYSCALL 1
149 /* Linux 2.3.39 introduced IPC64. Except for powerpc. */
150 #if __LINUX_KERNEL_VERSION >= 131879 && !defined __powerpc__
151 # define __ASSUME_IPC64 1
154 /* MIPS platforms had IPC64 all along. */
156 # define __ASSUME_IPC64 1
159 /* We can use the LDTs for threading with Linux 2.3.99 and newer. */
160 #if __LINUX_KERNEL_VERSION >= 131939
161 # define __ASSUME_LDT_WORKS 1
164 /* Linux 2.4.0 on PPC introduced a correct IPC64. But PowerPC64 does not
165 support a separate 64-bit sys call, already 64-bit */
166 #if __LINUX_KERNEL_VERSION >= 132096 && defined __powerpc__ \
167 && !defined __powerpc64__
168 # define __ASSUME_IPC64 1
171 /* SH kernels got stat64, mmap2, and truncate64 during 2.4.0-test. */
172 #if __LINUX_KERNEL_VERSION >= 132096 && defined __sh__
173 # define __ASSUME_TRUNCATE64_SYSCALL 1
174 # define __ASSUME_MMAP2_SYSCALL 1
175 # define __ASSUME_STAT64_SYSCALL 1
178 /* The changed st_ino field appeared in 2.4.0-test6. But we cannot
179 distinguish this version from other 2.4.0 releases. Therefore play
180 save and assume it available is for 2.4.1 and up. However, SH is lame,
181 and still does not have a 64-bit inode field. */
182 #if __LINUX_KERNEL_VERSION >= 132097 && !defined __alpha__ && !defined __sh__
183 # define __ASSUME_ST_INO_64_BIT 1
186 /* To support locking of large files a new fcntl() syscall was introduced
187 in 2.4.0-test7. We test for 2.4.1 for the earliest version we know
188 the syscall is available. */
189 #if __LINUX_KERNEL_VERSION >= 132097 && (defined __i386__ || defined __sparc__)
190 # define __ASSUME_FCNTL64 1
193 /* The AT_CLKTCK auxiliary vector entry was introduction in the 2.4.0
195 #if __LINUX_KERNEL_VERSION >= 132097
196 # define __ASSUME_AT_CLKTCK 1
199 /* Arm got fcntl64 in 2.4.4, PowerPC and SH have it also in 2.4.4 (I
200 don't know when it got introduced). But PowerPC64 does not support
201 separate FCNTL64 call, FCNTL is already 64-bit */
202 #if __LINUX_KERNEL_VERSION >= 132100 \
203 && (defined __arm__ || defined __powerpc__ || defined __sh__) \
204 && !defined __powerpc64__
205 # define __ASSUME_FCNTL64 1
208 /* The getdents64 syscall was introduced in 2.4.0-test7. We test for
209 2.4.1 for the earliest version we know the syscall is available. */
210 #if __LINUX_KERNEL_VERSION >= 132097
211 # define __ASSUME_GETDENTS64_SYSCALL 1
214 /* When did O_DIRECTORY became available? Early in 2.3 but when?
215 Be safe, use 2.3.99. */
216 #if __LINUX_KERNEL_VERSION >= 131939
217 # define __ASSUME_O_DIRECTORY 1
220 /* Starting with one of the 2.4.0 pre-releases the Linux kernel passes
221 up the page size information. */
222 #if __LINUX_KERNEL_VERSION >= 132097
223 # define __ASSUME_AT_PAGESIZE 1
226 /* Starting with at least 2.4.0 the kernel passes the uid/gid unconditionally
228 #if __LINUX_KERNEL_VERSION >= 132097
229 # define __ASSUME_AT_XID 1
232 /* Starting with 2.4.5 kernels PPC passes the AUXV in the standard way
233 and the vfork syscall made it into the official kernel. */
234 #if __LINUX_KERNEL_VERSION >= (132096+5) && defined __powerpc__
235 # define __ASSUME_STD_AUXV 1
236 # define __ASSUME_VFORK_SYSCALL 1
239 /* Starting with 2.4.5 kernels the mmap2 syscall made it into the official
240 kernel. But PowerPC64 does not support a separate MMAP2 call. */
241 #if __LINUX_KERNEL_VERSION >= (132096+5) && defined __powerpc__ \
242 && !defined __powerpc64__
243 # define __ASSUME_MMAP2_SYSCALL 1
246 /* Starting with 2.4.21 PowerPC implements the new prctl syscall.
247 This allows applications to get/set the Floating Point Exception Mode. */
248 #if __LINUX_KERNEL_VERSION >= (132096+21) && defined __powerpc__
249 # define __ASSUME_NEW_PRCTL_SYSCALL 1
252 /* Starting with 2.4.21 the PowerPC32 clone syscall works as expected. */
253 #if __LINUX_KERNEL_VERSION >= (132096+21) && defined __powerpc__ \
254 && !defined __powerpc64__
255 # define __ASSUME_FIXED_CLONE_SYSCALL 1
258 /* Starting with 2.4.21 PowerPC64 implements the new rt_sigreturn syscall.
259 The new rt_sigreturn takes an ucontext pointer allowing rt_sigreturn
260 to be used in the set/swapcontext implementation. */
261 #if __LINUX_KERNEL_VERSION >= (132096+21) && defined __powerpc64__
262 # define __ASSUME_NEW_RT_SIGRETURN_SYSCALL 1
265 /* On x86, the set_thread_area syscall was introduced in 2.5.29, but its
266 semantics was changed in 2.5.30, and again after 2.5.31. */
267 #if __LINUX_KERNEL_VERSION >= 132384 && defined __i386__
268 # define __ASSUME_SET_THREAD_AREA_SYSCALL 1
271 /* The vfork syscall on x86 and arm was definitely available in 2.4. */
272 #if __LINUX_KERNEL_VERSION >= 132097 && (defined __i386__ || defined __arm__)
273 # define __ASSUME_VFORK_SYSCALL 1
276 /* There are an infinite number of PA-RISC kernel versions numbered
277 2.4.0. But they've not really been released as such. We require
278 and expect the final version here. */
280 # define __ASSUME_32BITUIDS 1
281 # define __ASSUME_TRUNCATE64_SYSCALL 1
282 # define __ASSUME_MMAP2_SYSCALL 1
283 # define __ASSUME_STAT64_SYSCALL 1
284 # define __ASSUME_IPC64 1
285 # define __ASSUME_ST_INO_64_BIT 1
286 # define __ASSUME_FCNTL64 1
287 # define __ASSUME_GETDENTS64_SYSCALL 1
290 /* Alpha switched to a 64-bit timeval sometime before 2.2.0. */
291 #if __LINUX_KERNEL_VERSION >= 131584 && defined __alpha__
292 # define __ASSUME_TIMEVAL64 1
295 #if defined __mips__ && _MIPS_SIM == _ABIN32
296 # define __ASSUME_FCNTL64 1
299 /* The late 2.5 kernels saw a lot of new CLONE_* flags. Summarize
300 their availability with one define. The changes were made first
301 for i386 and the have to be done separately for the other archs.
302 For i386 we pick 2.5.50 as the first version with support. */
303 #if __LINUX_KERNEL_VERSION >= 132402 && defined __i386__
304 # define __ASSUME_CLONE_THREAD_FLAGS 1
307 /* These features were surely available with 2.4.12. */
308 #if __LINUX_KERNEL_VERSION >= 132108 && defined __mc68000__
309 # define __ASSUME_MMAP2_SYSCALL 1
310 # define __ASSUME_TRUNCATE64_SYSCALL 1
311 # define __ASSUME_STAT64_SYSCALL 1
312 # define __ASSUME_FCNTL64 1
313 # define __ASSUME_VFORK_SYSCALL 1
316 /* Beginning with 2.5.63 support for realtime and monotonic clocks and
317 timers based on them is available. */
318 #if __LINUX_KERNEL_VERSION >= 132415
319 # define __ASSUME_POSIX_TIMERS 1
322 /* Beginning with 2.6.12 the clock and timer supports CPU clocks. */
323 #if __LINUX_KERNEL_VERSION >= 0x2060c
324 # define __ASSUME_POSIX_CPU_TIMERS 1
327 /* The late 2.5 kernels saw a lot of new CLONE_* flags. Summarize
328 their availability with one define. The changes were made first
329 for i386 and the have to be done separately for the other archs.
330 For ia64, s390*, PPC, x86-64 we pick 2.5.64 as the first version
332 #if __LINUX_KERNEL_VERSION >= 132416 \
333 && (defined __ia64__ || defined __s390__ || defined __powerpc__ \
334 || defined __x86_64__ || defined __sh__)
335 # define __ASSUME_CLONE_THREAD_FLAGS 1
338 /* With kernel 2.4.17 we always have netlink support. */
339 #if __LINUX_KERNEL_VERSION >= (132096+17)
340 # define __ASSUME_NETLINK_SUPPORT 1
343 /* The requeue futex functionality was introduced in 2.5.70. */
344 #if __LINUX_KERNEL_VERSION >= 132422
345 # define __ASSUME_FUTEX_REQUEUE 1
348 /* The statfs64 syscalls are available in 2.5.74. */
349 #if __LINUX_KERNEL_VERSION >= 132426
350 # define __ASSUME_STATFS64 1
353 /* Starting with at least 2.5.74 the kernel passes the setuid-like exec
354 flag unconditionally up to the child. */
355 #if __LINUX_KERNEL_VERSION >= 132426
356 # define __ASSUME_AT_SECURE 1
359 /* Starting with the 2.5.75 kernel the kernel fills in the correct value
360 in the si_pid field passed as part of the siginfo_t struct to signal
362 #if __LINUX_KERNEL_VERSION >= 132427
363 # define __ASSUME_CORRECT_SI_PID 1
366 /* The tgkill syscall was instroduced for i386 in 2.5.75. For Alpha
367 it was introduced in 2.6.0-test1 which unfortunately cannot be
368 distinguished from 2.6.0. On x86-64, ppc, and ppc64 it was
369 introduced in 2.6.0-test3. */
370 #if (__LINUX_KERNEL_VERSION >= 132427 && defined __i386__) \
371 || (__LINUX_KERNEL_VERSION >= 132609 && defined __alpha__) \
372 || (__LINUX_KERNEL_VERSION >= 132609 && defined __x86_64__) \
373 || (__LINUX_KERNEL_VERSION >= 132609 && defined __powerpc__) \
374 || (__LINUX_KERNEL_VERSION >= 132609 && defined __sh__)
375 # define __ASSUME_TGKILL 1
378 /* The utimes syscall has been available for some architectures
379 forever. For x86 it was introduced after 2.5.75, for x86-64,
380 ppc, and ppc64 it was introduced in 2.6.0-test3. */
381 #if defined __alpha__ || defined __ia64__ || defined __hppa__ \
382 || defined __sparc__ \
383 || (__LINUX_KERNEL_VERSION > 132427 && defined __i386__) \
384 || (__LINUX_KERNEL_VERSION > 132609 && defined __x86_64__) \
385 || (__LINUX_KERNEL_VERSION >= 132609 && defined __powerpc__) \
386 || (__LINUX_KERNEL_VERSION >= 132609 && defined __sh__)
387 # define __ASSUME_UTIMES 1
390 // XXX Disabled for now since the semantics we want is not achieved.
392 /* The CLONE_STOPPED flag was introduced in the 2.6.0-test1 series. */
393 #if __LINUX_KERNEL_VERSION >= 132609
394 # define __ASSUME_CLONE_STOPPED 1
398 /* The fixed version of the posix_fadvise64 syscall appeared in
399 2.6.0-test3. At least for x86. Powerpc support appeared in
400 2.6.2, but for 32-bit userspace only. */
401 #if (__LINUX_KERNEL_VERSION >= 132609 && defined __i386__) \
402 || (__LINUX_KERNEL_VERSION >= 132610 && defined __powerpc__ \
403 && !defined __powerpc64__)
404 # define __ASSUME_FADVISE64_64_SYSCALL 1
407 /* The PROT_GROWSDOWN/PROT_GROWSUP flags were introduced in the 2.6.0-test
409 #if __LINUX_KERNEL_VERSION >= 132609
410 # define __ASSUME_PROT_GROWSUPDOWN 1
413 /* Starting with 2.6.0 PowerPC adds signal/swapcontext support for Vector
414 SIMD (AKA Altivec, VMX) instructions and register state. This changes
415 the overall size of the sigcontext and adds the swapcontext syscall. */
416 #if __LINUX_KERNEL_VERSION >= 132608 && defined __powerpc__
417 # define __ASSUME_SWAPCONTEXT_SYSCALL 1
420 /* The CLONE_DETACHED flag is not necessary in 2.6.2 kernels, it is
422 #if __LINUX_KERNEL_VERSION >= 132610
423 # define __ASSUME_NO_CLONE_DETACHED 1
426 /* Starting with version 2.6.4-rc1 the getdents syscall returns d_type
427 information as well and in between 2.6.5 and 2.6.8 most compat wrappers
428 were fixed too. Except s390{,x} which was fixed in 2.6.11. */
429 #if (__LINUX_KERNEL_VERSION >= 0x020608 && !defined __s390__) \
430 || (__LINUX_KERNEL_VERSION >= 0x02060b && defined __s390__)
431 # define __ASSUME_GETDENTS32_D_TYPE 1
434 /* Starting with version 2.5.3, the initial location returned by `brk'
435 after exec is always rounded up to the next page. */
436 #if __LINUX_KERNEL_VERSION >= 132355
437 # define __ASSUME_BRK_PAGE_ROUNDED 1
440 /* Starting with version 2.6.9, the waitid system call is available.
441 Except for powerpc{,64} and s390{,x}, where it is available in 2.6.12. */
442 #if (__LINUX_KERNEL_VERSION >= 0x020609 \
443 && !defined __powerpc__ && !defined __s390__) \
444 || (__LINUX_KERNEL_VERSION >= 0x02060c \
445 && (defined __powerpc__ || defined __s390__))
446 # define __ASSUME_WAITID_SYSCALL 1
449 /* Starting with version 2.6.9, SSI_IEEE_RAISE_EXCEPTION exists. */
450 #if __LINUX_KERNEL_VERSION >= 0x020609 && defined __alpha__
451 #define __ASSUME_IEEE_RAISE_EXCEPTION 1
454 /* On sparc64 stat64/lstat64/fstat64 syscalls were introduced in 2.6.12. */
455 #if __LINUX_KERNEL_VERSION >= 0x02060c && defined __sparc__ \
456 && defined __arch64__
457 # define __ASSUME_STAT64_SYSCALL 1
460 /* Early kernel used "shm" as the filesystem name for the filesystem used
461 for shm_open etc. Later it is "tmpfs". 2.4.20 is a safe bet for the
463 #if __LINUX_KERNEL_VERSION >= 0x02041a
464 # define __ASSUME_TMPFS_NAME 1
467 /* pselect was introduced just after 2.6.16-rc1. Due to the way the
468 kernel versions are advertised we can only rely on 2.6.17 to have
470 #if __LINUX_KERNEL_VERSION >= 0x020611 \
471 && (defined __i386__ || defined __powerpc__)
472 # define __ASSUME_PSELECT 1
475 /* ppoll was introduced just after 2.6.16-rc1. Due to the way the
476 kernel versions are advertised we can only rely on 2.6.17 to have
478 #if __LINUX_KERNEL_VERSION >= 0x020611 \
479 && (defined __i386__ || defined __powerpc__)
480 # define __ASSUME_PPOLL 1
483 /* The *at syscalls were introduced just after 2.6.16-rc1. Due to the way the
484 kernel versions are advertised we can only rely on 2.6.17 to have
486 #if __LINUX_KERNEL_VERSION >= 0x020611 \
487 && (defined __i386__ || defined __x86_64__)
488 # define __ASSUME_ATFCTS 1
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