1/* Set flags signalling availability of kernel features based on given 2 kernel version number. 3 Copyright (C) 1999-2003, 2004, 2005 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, write to the Free 18 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 19 02111-1307 USA. */ 20 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. */ 23 24#if defined __mips__ 25# include <sgidefs.h> 26#endif 27 28#include <linux/version.h> 29#define __LINUX_KERNEL_VERSION LINUX_VERSION_CODE 30 31/* We assume for __LINUX_KERNEL_VERSION the same encoding used in 32 linux/version.h. I.e., the major, minor, and subminor all get a 33 byte with the major number being in the highest byte. This means 34 we can do numeric comparisons. 35 36 In the following we will define certain symbols depending on 37 whether the describes kernel feature is available in the kernel 38 version given by __LINUX_KERNEL_VERSION. We are not always exactly 39 recording the correct versions in which the features were 40 introduced. If somebody cares these values can afterwards be 41 corrected. Most of the numbers here are set corresponding to 42 2.2.0. */ 43 44/* `getcwd' system call. */ 45#if __LINUX_KERNEL_VERSION >= 131584 46# define __ASSUME_GETCWD_SYSCALL 1 47#endif 48 49/* When was `poll' introduced? */ 50#if __LINUX_KERNEL_VERSION >= 131584 51# define __ASSUME_POLL_SYSCALL 1 52#endif 53 54/* Real-time signal became usable in 2.1.70. */ 55#if __LINUX_KERNEL_VERSION >= 131398 56# define __ASSUME_REALTIME_SIGNALS 1 57#endif 58 59/* When were the `pread'/`pwrite' syscalls introduced? */ 60#if __LINUX_KERNEL_VERSION >= 131584 61# define __ASSUME_PREAD_SYSCALL 1 62# define __ASSUME_PWRITE_SYSCALL 1 63#endif 64 65/* When was `poll' introduced? */ 66#if __LINUX_KERNEL_VERSION >= 131584 67# define __ASSUME_POLL_SYSCALL 1 68#endif 69 70/* The `lchown' syscall was introduced in 2.1.80. */ 71#if __LINUX_KERNEL_VERSION >= 131408 72# define __ASSUME_LCHOWN_SYSCALL 1 73#endif 74 75/* When did the `setresuid' sysall became available? */ 76#if __LINUX_KERNEL_VERSION >= 131584 && !defined __sparc__ 77# define __ASSUME_SETRESUID_SYSCALL 1 78#endif 79 80/* The SIOCGIFNAME ioctl is available starting with 2.1.50. */ 81#if __LINUX_KERNEL_VERSION >= 131408 82# define __ASSUME_SIOCGIFNAME 1 83#endif 84 85/* MSG_NOSIGNAL was at least available with Linux 2.2.0. */ 86#if __LINUX_KERNEL_VERSION >= 131584 87# define __ASSUME_MSG_NOSIGNAL 1 88#endif 89 90/* On x86 another `getrlimit' syscall was added in 2.3.25. */ 91#if __LINUX_KERNEL_VERSION >= 131865 && defined __i386__ 92# define __ASSUME_NEW_GETRLIMIT_SYSCALL 1 93#endif 94 95/* On x86 the truncate64/ftruncate64 syscalls were introduced in 2.3.31. */ 96#if __LINUX_KERNEL_VERSION >= 131871 && defined __i386__ 97# define __ASSUME_TRUNCATE64_SYSCALL 1 98#endif 99 100/* On x86 the mmap2 syscall was introduced in 2.3.31. */ 101#if __LINUX_KERNEL_VERSION >= 131871 && defined __i386__ 102# define __ASSUME_MMAP2_SYSCALL 1 103#endif 104 105/* On x86 the stat64/lstat64/fstat64 syscalls were introduced in 2.3.34. */ 106#if __LINUX_KERNEL_VERSION >= 131874 && defined __i386__ 107# define __ASSUME_STAT64_SYSCALL 1 108#endif 109 110/* On sparc and ARM the truncate64/ftruncate64/mmap2/stat64/lstat64/fstat64 111 syscalls were introduced in 2.3.35. */ 112#if __LINUX_KERNEL_VERSION >= 131875 && (defined __sparc__ || defined __arm__) 113# define __ASSUME_TRUNCATE64_SYSCALL 1 114# define __ASSUME_MMAP2_SYSCALL 1 115# define __ASSUME_STAT64_SYSCALL 1 116#endif 117 118/* I know for sure that getrlimit are in 2.3.35 on powerpc. */ 119#if __LINUX_KERNEL_VERSION >= 131875 && defined __powerpc__ 120# define __ASSUME_NEW_GETRLIMIT_SYSCALL 1 121#endif 122 123/* I know for sure that these are in 2.3.35 on powerpc. But PowerPC64 does not 124 support separate 64-bit syscalls, already 64-bit */ 125#if __LINUX_KERNEL_VERSION >= 131875 && defined __powerpc__ \ 126 && !defined __powerpc64__ 127# define __ASSUME_TRUNCATE64_SYSCALL 1 128# define __ASSUME_STAT64_SYSCALL 1 129#endif 130 131/* Linux 2.3.39 introduced 32bit UID/GIDs. Some platforms had 32 132 bit type all along. */ 133#if __LINUX_KERNEL_VERSION >= 131879 || defined __powerpc__ || defined __mips__ 134# define __ASSUME_32BITUIDS 1 135#endif 136 137/* Linux 2.3.39 sparc added setresuid. */ 138#if __LINUX_KERNEL_VERSION >= 131879 && defined __sparc__ 139# define __ASSUME_SETRESUID_SYSCALL 1 140#endif 141 142#if __LINUX_KERNEL_VERSION >= 131879 143# define __ASSUME_SETRESGID_SYSCALL 1 144#endif 145 146/* Linux 2.3.39 introduced IPC64. Except for powerpc. */ 147#if __LINUX_KERNEL_VERSION >= 131879 && !defined __powerpc__ 148# define __ASSUME_IPC64 1 149#endif 150 151/* MIPS platforms had IPC64 all along. */ 152#if defined __mips__ 153# define __ASSUME_IPC64 1 154#endif 155 156/* We can use the LDTs for threading with Linux 2.3.99 and newer. */ 157#if __LINUX_KERNEL_VERSION >= 131939 158# define __ASSUME_LDT_WORKS 1 159#endif 160 161/* Linux 2.4.0 on PPC introduced a correct IPC64. But PowerPC64 does not 162 support a separate 64-bit sys call, already 64-bit */ 163#if __LINUX_KERNEL_VERSION >= 132096 && defined __powerpc__ \ 164 && !defined __powerpc64__ 165# define __ASSUME_IPC64 1 166#endif 167 168/* SH kernels got stat64, mmap2, and truncate64 during 2.4.0-test. */ 169#if __LINUX_KERNEL_VERSION >= 132096 && defined __sh__ 170# define __ASSUME_TRUNCATE64_SYSCALL 1 171# define __ASSUME_MMAP2_SYSCALL 1 172# define __ASSUME_STAT64_SYSCALL 1 173#endif 174 175/* The changed st_ino field appeared in 2.4.0-test6. But we cannot 176 distinguish this version from other 2.4.0 releases. Therefore play 177 save and assume it available is for 2.4.1 and up. However, SH is lame, 178 and still does not have a 64-bit inode field. */ 179#if __LINUX_KERNEL_VERSION >= 132097 && !defined __alpha__ && !defined __sh__ 180# define __ASSUME_ST_INO_64_BIT 1 181#endif 182 183/* To support locking of large files a new fcntl() syscall was introduced 184 in 2.4.0-test7. We test for 2.4.1 for the earliest version we know 185 the syscall is available. */ 186#if __LINUX_KERNEL_VERSION >= 132097 && (defined __i386__ || defined __sparc__) 187# define __ASSUME_FCNTL64 1 188#endif 189 190/* The AT_CLKTCK auxiliary vector entry was introduction in the 2.4.0 191 series. */ 192#if __LINUX_KERNEL_VERSION >= 132097 193# define __ASSUME_AT_CLKTCK 1 194#endif 195 196/* Arm got fcntl64 in 2.4.4, PowerPC and SH have it also in 2.4.4 (I 197 don't know when it got introduced). But PowerPC64 does not support 198 separate FCNTL64 call, FCNTL is already 64-bit */ 199#if __LINUX_KERNEL_VERSION >= 132100 \ 200 && (defined __arm__ || defined __powerpc__ || defined __sh__) \ 201 && !defined __powerpc64__ 202# define __ASSUME_FCNTL64 1 203#endif 204 205/* The getdents64 syscall was introduced in 2.4.0-test7. We test for 206 2.4.1 for the earliest version we know the syscall is available. */ 207#if __LINUX_KERNEL_VERSION >= 132097 208# define __ASSUME_GETDENTS64_SYSCALL 1 209#endif 210 211/* When did O_DIRECTORY became available? Early in 2.3 but when? 212 Be safe, use 2.3.99. */ 213#if __LINUX_KERNEL_VERSION >= 131939 214# define __ASSUME_O_DIRECTORY 1 215#endif 216 217/* Starting with one of the 2.4.0 pre-releases the Linux kernel passes 218 up the page size information. */ 219#if __LINUX_KERNEL_VERSION >= 132097 220# define __ASSUME_AT_PAGESIZE 1 221#endif 222 223/* Starting with at least 2.4.0 the kernel passes the uid/gid unconditionally 224 up to the child. */ 225#if __LINUX_KERNEL_VERSION >= 132097 226# define __ASSUME_AT_XID 1 227#endif 228 229/* Starting with 2.4.5 kernels PPC passes the AUXV in the standard way 230 and the vfork syscall made it into the official kernel. */ 231#if __LINUX_KERNEL_VERSION >= (132096+5) && defined __powerpc__ 232# define __ASSUME_STD_AUXV 1 233# define __ASSUME_VFORK_SYSCALL 1 234#endif 235 236/* Starting with 2.4.5 kernels the mmap2 syscall made it into the official 237 kernel. But PowerPC64 does not support a separate MMAP2 call. */ 238#if __LINUX_KERNEL_VERSION >= (132096+5) && defined __powerpc__ \ 239 && !defined __powerpc64__ 240# define __ASSUME_MMAP2_SYSCALL 1 241#endif 242 243/* Starting with 2.4.21 PowerPC implements the new prctl syscall. 244 This allows applications to get/set the Floating Point Exception Mode. */ 245#if __LINUX_KERNEL_VERSION >= (132096+21) && defined __powerpc__ 246# define __ASSUME_NEW_PRCTL_SYSCALL 1 247#endif 248 249/* Starting with 2.4.21 the PowerPC32 clone syscall works as expected. */ 250#if __LINUX_KERNEL_VERSION >= (132096+21) && defined __powerpc__ \ 251 && !defined __powerpc64__ 252# define __ASSUME_FIXED_CLONE_SYSCALL 1 253#endif 254 255/* Starting with 2.4.21 PowerPC64 implements the new rt_sigreturn syscall. 256 The new rt_sigreturn takes an ucontext pointer allowing rt_sigreturn 257 to be used in the set/swapcontext implementation. */ 258#if __LINUX_KERNEL_VERSION >= (132096+21) && defined __powerpc64__ 259# define __ASSUME_NEW_RT_SIGRETURN_SYSCALL 1 260#endif 261 262/* On x86, the set_thread_area syscall was introduced in 2.5.29, but its 263 semantics was changed in 2.5.30, and again after 2.5.31. */ 264#if __LINUX_KERNEL_VERSION >= 132384 && defined __i386__ 265# define __ASSUME_SET_THREAD_AREA_SYSCALL 1 266#endif 267 268/* The vfork syscall on x86 and arm was definitely available in 2.4. */ 269#if __LINUX_KERNEL_VERSION >= 132097 && (defined __i386__ || defined __arm__) 270# define __ASSUME_VFORK_SYSCALL 1 271#endif 272 273/* There are an infinite number of PA-RISC kernel versions numbered 274 2.4.0. But they've not really been released as such. We require 275 and expect the final version here. */ 276#ifdef __hppa__ 277# define __ASSUME_32BITUIDS 1 278# define __ASSUME_TRUNCATE64_SYSCALL 1 279# define __ASSUME_MMAP2_SYSCALL 1 280# define __ASSUME_STAT64_SYSCALL 1 281# define __ASSUME_IPC64 1 282# define __ASSUME_ST_INO_64_BIT 1 283# define __ASSUME_FCNTL64 1 284# define __ASSUME_GETDENTS64_SYSCALL 1 285#endif 286 287/* Alpha switched to a 64-bit timeval sometime before 2.2.0. */ 288#if __LINUX_KERNEL_VERSION >= 131584 && defined __alpha__ 289# define __ASSUME_TIMEVAL64 1 290#endif 291 292#if defined __mips__ && _MIPS_SIM == _ABIN32 293# define __ASSUME_FCNTL64 1 294#endif 295 296/* The late 2.5 kernels saw a lot of new CLONE_* flags. Summarize 297 their availability with one define. The changes were made first 298 for i386 and the have to be done separately for the other archs. 299 For i386 we pick 2.5.50 as the first version with support. */ 300#if __LINUX_KERNEL_VERSION >= 132402 && defined __i386__ 301# define __ASSUME_CLONE_THREAD_FLAGS 1 302#endif 303 304/* Support for various CLOEXEC and NONBLOCK flags was added for x86, 305 x86-64, PPC, IA-64, SPARC< and S390 in 2.6.23. */ 306#if __LINUX_KERNEL_VERSION >= 0x020617 \ 307 && (defined __i386__ || defined __x86_64__ || defined __powerpc__ \ 308 || defined __ia64__ || defined __sparc__ || defined __s390__) 309# define __ASSUME_O_CLOEXEC 1 310#endif 311 312/* Support for various CLOEXEC and NONBLOCK flags was added for x86, 313 * x86-64, PPC, IA-64, and SPARC in 2.6.27. */ 314#if __LINUX_KERNEL_VERSION >= 0x02061b \ 315 && (defined __i386__ || defined __x86_64__ || defined __powerpc__ \ 316 || defined __ia64__ || defined __sparc__ || defined __s390__) 317/* # define __ASSUME_SOCK_CLOEXEC 1 */ 318/* # define __ASSUME_IN_NONBLOCK 1 */ 319# define __ASSUME_PIPE2 1 320/* # define __ASSUME_EVENTFD2 1 */ 321/* # define __ASSUME_SIGNALFD4 1 */ 322#endif 323 324 325/* These features were surely available with 2.4.12. */ 326#if __LINUX_KERNEL_VERSION >= 132108 && defined __mc68000__ 327# define __ASSUME_MMAP2_SYSCALL 1 328# define __ASSUME_TRUNCATE64_SYSCALL 1 329# define __ASSUME_STAT64_SYSCALL 1 330# define __ASSUME_FCNTL64 1 331# define __ASSUME_VFORK_SYSCALL 1 332#endif 333 334/* Beginning with 2.5.63 support for realtime and monotonic clocks and 335 timers based on them is available. */ 336#if __LINUX_KERNEL_VERSION >= 132415 337# define __ASSUME_POSIX_TIMERS 1 338#endif 339 340/* Beginning with 2.6.12 the clock and timer supports CPU clocks. */ 341#if __LINUX_KERNEL_VERSION >= 0x2060c 342# define __ASSUME_POSIX_CPU_TIMERS 1 343#endif 344 345/* The late 2.5 kernels saw a lot of new CLONE_* flags. Summarize 346 their availability with one define. The changes were made first 347 for i386 and the have to be done separately for the other archs. 348 For ia64, s390*, PPC, x86-64 we pick 2.5.64 as the first version 349 with support. */ 350#if __LINUX_KERNEL_VERSION >= 132416 \ 351 && (defined __ia64__ || defined __s390__ || defined __powerpc__ \ 352 || defined __x86_64__ || defined __sh__) 353# define __ASSUME_CLONE_THREAD_FLAGS 1 354#endif 355 356/* With kernel 2.4.17 we always have netlink support. */ 357#if __LINUX_KERNEL_VERSION >= (132096+17) 358# define __ASSUME_NETLINK_SUPPORT 1 359#endif 360 361/* The requeue futex functionality was introduced in 2.5.70. */ 362#if __LINUX_KERNEL_VERSION >= 132422 363# define __ASSUME_FUTEX_REQUEUE 1 364#endif 365 366/* The statfs64 syscalls are available in 2.5.74. */ 367#if __LINUX_KERNEL_VERSION >= 132426 368# define __ASSUME_STATFS64 1 369#endif 370 371/* Starting with at least 2.5.74 the kernel passes the setuid-like exec 372 flag unconditionally up to the child. */ 373#if __LINUX_KERNEL_VERSION >= 132426 374# define __ASSUME_AT_SECURE 1 375#endif 376 377/* Starting with the 2.5.75 kernel the kernel fills in the correct value 378 in the si_pid field passed as part of the siginfo_t struct to signal 379 handlers. */ 380#if __LINUX_KERNEL_VERSION >= 132427 381# define __ASSUME_CORRECT_SI_PID 1 382#endif 383 384/* The tgkill syscall was instroduced for i386 in 2.5.75. For Alpha 385 it was introduced in 2.6.0-test1 which unfortunately cannot be 386 distinguished from 2.6.0. On x86-64, ppc, and ppc64 it was 387 introduced in 2.6.0-test3. */ 388#if (__LINUX_KERNEL_VERSION >= 132427 && defined __i386__) \ 389 || (__LINUX_KERNEL_VERSION >= 132609 && defined __alpha__) \ 390 || (__LINUX_KERNEL_VERSION >= 132609 && defined __x86_64__) \ 391 || (__LINUX_KERNEL_VERSION >= 132609 && defined __powerpc__) \ 392 || (__LINUX_KERNEL_VERSION >= 132609 && defined __sh__) 393# define __ASSUME_TGKILL 1 394#endif 395 396/* The utimes syscall has been available for some architectures 397 forever. For x86 it was introduced after 2.5.75, for x86-64, 398 ppc, and ppc64 it was introduced in 2.6.0-test3. */ 399#if defined __alpha__ || defined __ia64__ || defined __hppa__ \ 400 || defined __sparc__ \ 401 || (__LINUX_KERNEL_VERSION > 132427 && defined __i386__) \ 402 || (__LINUX_KERNEL_VERSION > 132609 && defined __x86_64__) \ 403 || (__LINUX_KERNEL_VERSION >= 132609 && defined __powerpc__) \ 404 || (__LINUX_KERNEL_VERSION >= 132609 && defined __sh__) 405# define __ASSUME_UTIMES 1 406#endif 407 408// XXX Disabled for now since the semantics we want is not achieved. 409#if 0 410/* The CLONE_STOPPED flag was introduced in the 2.6.0-test1 series. */ 411#if __LINUX_KERNEL_VERSION >= 132609 412# define __ASSUME_CLONE_STOPPED 1 413#endif 414#endif 415 416/* The fixed version of the posix_fadvise64 syscall appeared in 417 2.6.0-test3. At least for x86. Powerpc support appeared in 418 2.6.2, but for 32-bit userspace only. */ 419#if (__LINUX_KERNEL_VERSION >= 132609 && defined __i386__) \ 420 || (__LINUX_KERNEL_VERSION >= 132610 && defined __powerpc__ \ 421 && !defined __powerpc64__) 422# define __ASSUME_FADVISE64_64_SYSCALL 1 423#endif 424 425/* The PROT_GROWSDOWN/PROT_GROWSUP flags were introduced in the 2.6.0-test 426 series. */ 427#if __LINUX_KERNEL_VERSION >= 132609 428# define __ASSUME_PROT_GROWSUPDOWN 1 429#endif 430 431/* Starting with 2.6.0 PowerPC adds signal/swapcontext support for Vector 432 SIMD (AKA Altivec, VMX) instructions and register state. This changes 433 the overall size of the sigcontext and adds the swapcontext syscall. */ 434#if __LINUX_KERNEL_VERSION >= 132608 && defined __powerpc__ 435# define __ASSUME_SWAPCONTEXT_SYSCALL 1 436#endif 437 438/* The CLONE_DETACHED flag is not necessary in 2.6.2 kernels, it is 439 implied. */ 440#if __LINUX_KERNEL_VERSION >= 132610 441# define __ASSUME_NO_CLONE_DETACHED 1 442#endif 443 444/* Starting with version 2.6.4-rc1 the getdents syscall returns d_type 445 information as well and in between 2.6.5 and 2.6.8 most compat wrappers 446 were fixed too. Except s390{,x} which was fixed in 2.6.11. */ 447#if (__LINUX_KERNEL_VERSION >= 0x020608 && !defined __s390__) \ 448 || (__LINUX_KERNEL_VERSION >= 0x02060b && defined __s390__) 449# define __ASSUME_GETDENTS32_D_TYPE 1 450#endif 451 452/* Starting with version 2.5.3, the initial location returned by `brk' 453 after exec is always rounded up to the next page. */ 454#if __LINUX_KERNEL_VERSION >= 132355 455# define __ASSUME_BRK_PAGE_ROUNDED 1 456#endif 457 458/* Starting with version 2.6.9, the waitid system call is available. 459 Except for powerpc and powerpc64, where it is available in 2.6.12. */ 460#if (__LINUX_KERNEL_VERSION >= 0x020609 && !defined __powerpc__) \ 461 || (__LINUX_KERNEL_VERSION >= 0x02060c && defined __powerpc__) 462# define __ASSUME_WAITID_SYSCALL 1 463#endif 464 465/* Starting with version 2.6.9, SSI_IEEE_RAISE_EXCEPTION exists. */ 466#if __LINUX_KERNEL_VERSION >= 0x020609 && defined __alpha__ 467#define __ASSUME_IEEE_RAISE_EXCEPTION 1 468#endif 469 470/* Support for the accept4 syscall was added in 2.6.28. */ 471#if __LINUX_KERNEL_VERSION >= 0x02061c \ 472 && (defined __i386__ || defined __x86_64__ || defined __powerpc__ \ 473 || defined __sparc__ || defined __s390__) 474# define __ASSUME_ACCEPT4 1 475#endif 476 477/* Support for the accept4 syscall for alpha was added after 2.6.33-rc1. */ 478#if __LINUX_KERNEL_VERSION >= 0x020621 && defined __alpha__ 479# define __ASSUME_ACCEPT4 1 480#endif 481 482/* Support for the FUTEX_CLOCK_REALTIME flag was added in 2.6.29. */ 483#if __LINUX_KERNEL_VERSION >= 0x02061d 484# define __ASSUME_FUTEX_CLOCK_REALTIME 1 485#endif 486 487/* Support for PI futexes was added in 2.6.18. */ 488#if __LINUX_KERNEL_VERSION >= 0x020612 489# define __ASSUME_FUTEX_LOCK_PI 1 490#endif 491 492/* Support for private futexes was added in 2.6.22. */ 493#if __LINUX_KERNEL_VERSION >= 0x020616 494# define __ASSUME_PRIVATE_FUTEX 1 495#endif 496 497 498