[thirdparty/glibc.git] / sysdeps / unix / sysv / linux / kernel-features.h

/* Set flags signalling availability of kernel features based on given
   kernel version number.
   Copyright (C) 1999, 2000, 2001, 2002, 2003 Free Software Foundation, Inc.
   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, write to the Free
   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
   02111-1307 USA.  */

/* This file must not contain any C code.  At least it must be protected
   to allow using the file also in assembler files.  */

#ifndef __LINUX_KERNEL_VERSION
/* We assume the worst; all kernels should be supported.  */
# define __LINUX_KERNEL_VERSION	0
#endif

/* We assume for __LINUX_KERNEL_VERSION the same encoding used in
   linux/version.h.  I.e., the major, minor, and subminor all get a
   byte with the major number being in the highest byte.  This means
   we can do numeric comparisons.

   In the following we will define certain symbols depending on
   whether the describes kernel feature is available in the kernel
   version given by __LINUX_KERNEL_VERSION.  We are not always exactly
   recording the correct versions in which the features were
   introduced.  If somebody cares these values can afterwards be
   corrected.  Most of the numbers here are set corresponding to
   2.2.0.  */

/* `getcwd' system call.  */
#if __LINUX_KERNEL_VERSION >= 131584
# define __ASSUME_GETCWD_SYSCALL	1
#endif

/* Real-time signal became usable in 2.1.70.  */
#if __LINUX_KERNEL_VERSION >= 131398
# define __ASSUME_REALTIME_SIGNALS	1
#endif

/* When were the `pread'/`pwrite' syscalls introduced?  */
#if __LINUX_KERNEL_VERSION >= 131584
# define __ASSUME_PREAD_SYSCALL		1
# define __ASSUME_PWRITE_SYSCALL	1
#endif

/* When was `poll' introduced?  */
#if __LINUX_KERNEL_VERSION >= 131584
# define __ASSUME_POLL_SYSCALL		1
#endif

/* The `lchown' syscall was introduced in 2.1.80.  */
#if __LINUX_KERNEL_VERSION >= 131408
# define __ASSUME_LCHOWN_SYSCALL	1
#endif

/* When did the `setresuid' sysall became available?  */
#if __LINUX_KERNEL_VERSION >= 131584 && !defined __sparc__
# define __ASSUME_SETRESUID_SYSCALL	1
#endif

/* The SIOCGIFNAME ioctl is available starting with 2.1.50.  */
#if __LINUX_KERNEL_VERSION >= 131408
# define __ASSUME_SIOCGIFNAME		1
#endif

/* On x86 another `getrlimit' syscall was added in 2.3.25.  */
#if __LINUX_KERNEL_VERSION >= 131865 && defined __i386__
# define __ASSUME_NEW_GETRLIMIT_SYSCALL	1
#endif

/* On x86 the truncate64/ftruncate64 syscalls were introduced in 2.3.31.  */
#if __LINUX_KERNEL_VERSION >= 131871 && defined __i386__
# define __ASSUME_TRUNCATE64_SYSCALL	1
#endif

/* On x86 the mmap2 syscall was introduced in 2.3.31.  */
#if __LINUX_KERNEL_VERSION >= 131871 && defined __i386__
# define __ASSUME_MMAP2_SYSCALL	1
#endif

/* On x86 the stat64/lstat64/fstat64 syscalls were introduced in 2.3.34.  */
#if __LINUX_KERNEL_VERSION >= 131874 && defined __i386__
# define __ASSUME_STAT64_SYSCALL	1
#endif

/* On sparc and ARM the truncate64/ftruncate64/mmap2/stat64/lstat64/fstat64
   syscalls were introduced in 2.3.35.  */
#if __LINUX_KERNEL_VERSION >= 131875 && (defined __sparc__ || defined __arm__)
# define __ASSUME_TRUNCATE64_SYSCALL	1
# define __ASSUME_MMAP2_SYSCALL		1
# define __ASSUME_STAT64_SYSCALL	1
#endif

/* I know for sure that getrlimit are in 2.3.35 on powerpc.  */
#if __LINUX_KERNEL_VERSION >= 131875 && defined __powerpc__
# define __ASSUME_NEW_GETRLIMIT_SYSCALL	1
#endif

/* I know for sure that these are in 2.3.35 on powerpc. But PowerPC64 does not
   support separate 64-bit syscalls, already 64-bit */
#if __LINUX_KERNEL_VERSION >= 131875 && defined __powerpc__ \
    && !defined __powerpc64__
# define __ASSUME_TRUNCATE64_SYSCALL	1
# define __ASSUME_STAT64_SYSCALL	1
#endif

/* Linux 2.3.39 introduced 32bit UID/GIDs.  Some platforms had 32
   bit type all along.  */
#if __LINUX_KERNEL_VERSION >= 131879 || defined __powerpc__ || defined __mips__
# define __ASSUME_32BITUIDS		1
#endif

/* Linux 2.3.39 sparc added setresuid.  */
#if __LINUX_KERNEL_VERSION >= 131879 && defined __sparc__
# define __ASSUME_SETRESUID_SYSCALL	1
#endif

/* Linux 2.3.39 introduced IPC64.  Except for powerpc.  */
#if __LINUX_KERNEL_VERSION >= 131879 && !defined __powerpc__
# define __ASSUME_IPC64		1
#endif

/* mips platforms had IPC64 all along.  */
#if defined __mips__
# define __ASSUME_IPC64		1
#endif

/* Linux 2.4.0 on PPC introduced a correct IPC64. But PowerPC64 does not
   support a separate 64-bit sys call, already 64-bit */
#if __LINUX_KERNEL_VERSION >= 132096 && defined __powerpc__ \
    && !defined __powerpc64__
# define __ASSUME_IPC64			1
#endif

/* We can use the LDTs for threading with Linux 2.3.99 and newer.  */
#if __LINUX_KERNEL_VERSION >= 131939
# define __ASSUME_LDT_WORKS		1
#endif

/* The changed st_ino field appeared in 2.4.0-test6.  But we cannot
   distinguish this version from other 2.4.0 releases.  Therefore play
   save and assume it available is for 2.4.1 and up.  */
#if __LINUX_KERNEL_VERSION >= 132097
# define __ASSUME_ST_INO_64_BIT		1
#endif

/* To support locking of large files a new fcntl() syscall was introduced
   in 2.4.0-test7.  We test for 2.4.1 for the earliest version we know
   the syscall is available.  */
#if __LINUX_KERNEL_VERSION >= 132097 && (defined __i386__ || defined __sparc__)
# define __ASSUME_FCNTL64		1
#endif

/* Arm got fcntl64 in 2.4.4, PowerPC and SH have it also in 2.4.4 (I
   don't know when it got introduced).  But PowerPC64 does not support
   separate FCNTL64 call, FCNTL is already 64-bit */
#if __LINUX_KERNEL_VERSION >= 132100 \
    && (defined __arm__ || defined __powerpc__ || defined __sh__) \
    && !defined __powerpc64__
# define __ASSUME_FCNTL64		1
#endif

/* The getdents64 syscall was introduced in 2.4.0-test7.  We test for
   2.4.1 for the earliest version we know the syscall is available.  */
#if __LINUX_KERNEL_VERSION >= 132097
# define __ASSUME_GETDENTS64_SYSCALL	1
#endif

/* When did O_DIRECTORY became available?  Early in 2.3 but when?
   Be safe, use 2.3.99.  */
#if __LINUX_KERNEL_VERSION >= 131939
# define __ASSUME_O_DIRECTORY		1
#endif

/* Starting with one of the 2.4.0 pre-releases the Linux kernel passes
   up the page size information.  */
#if __LINUX_KERNEL_VERSION >= 132097
# define __ASSUME_AT_PAGESIZE		1
#endif

/* Starting with at least 2.4.0 the kernel passes the uid/gid unconditionally
   up to the child.  */
#if __LINUX_KERNEL_VERSION >= 132097
# define __ASSUME_AT_XID		1
#endif

/* Starting with 2.4.5 kernels PPC passes the AUXV in the standard way
   and the vfork syscall made it into the official kernel.  */
#if __LINUX_KERNEL_VERSION >= (132096+5) && defined __powerpc__
# define __ASSUME_STD_AUXV		1
# define __ASSUME_VFORK_SYSCALL		1
#endif

/* Starting with 2.4.5 kernels the mmap2 syscall made it into the official
   kernel.  But PowerPC64 does not support a separate MMAP2 call.  */
#if __LINUX_KERNEL_VERSION >= (132096+5) && defined __powerpc__ \
    && !defined __powerpc64__
# define __ASSUME_MMAP2_SYSCALL		1
#endif

/* Starting with 2.4.21 PowerPC implements the new prctl syscall.
   This allows applications to get/set the Floating Point Exception Mode.  */
#if __LINUX_KERNEL_VERSION >= (132096+21) && defined __powerpc__
# define __ASSUME_NEW_PRCTL_SYSCALL		1
#endif

/* Starting with 2.4.21 PowerPC64 implements the new rt_sigreturn syscall.
   The new rt_sigreturn takes an ucontext pointer allowing rt_sigreturn
   to be used in the set/swapcontext implementation.  */
#if __LINUX_KERNEL_VERSION >= (132096+21) && defined __powerpc64__
# define __ASSUME_NEW_RT_SIGRETURN_SYSCALL		1
#endif

/* On x86, the set_thread_area syscall was introduced in 2.5.29, but its
   semantics was changed in 2.5.30, and again after 2.5.31.  */
#if __LINUX_KERNEL_VERSION >= 132384 && defined __i386__
# define __ASSUME_SET_THREAD_AREA_SYSCALL	1
#endif

/* The vfork syscall on x86 and arm was definitely available in 2.4.  */
#if __LINUX_KERNEL_VERSION >= 132097 && (defined __i386__ || defined __arm__)
# define __ASSUME_VFORK_SYSCALL		1
#endif

/* There are an infinite number of PA-RISC kernel versions numbered
   2.4.0.  But they've not really been released as such.  We require
   and expect the final version here.  */
#ifdef __hppa__
# define __ASSUME_32BITUIDS		1
# define __ASSUME_TRUNCATE64_SYSCALL	1
# define __ASSUME_MMAP2_SYSCALL		1
# define __ASSUME_STAT64_SYSCALL	1
# define __ASSUME_IPC64			1
# define __ASSUME_ST_INO_64_BIT		1
# define __ASSUME_FCNTL64		1
# define __ASSUME_GETDENTS64_SYSCALL	1
#endif

#if defined __mips__ && defined _ABIN32 && _MIPS_SIM == _ABIN32
# define __ASSUME_FCNTL64		1
#endif

/* The late 2.5 kernels saw a lot of new CLONE_* flags.  Summarize
   their availability with one define.  The changes were made first
   for i386 and the have to be done separately for the other archs.
   For i386 we pick 2.5.50 as the first version with support.  */
#if __LINUX_KERNEL_VERSION >= 132402 && defined __i386__
# define __ASSUME_CLONE_THREAD_FLAGS	1
#endif

/* These features were surely available with 2.4.12.  */
#if __LINUX_KERNEL_VERSION >= 132108 && defined __mc68000__
# define __ASSUME_MMAP2_SYSCALL		1
# define __ASSUME_TRUNCATE64_SYSCALL	1
# define __ASSUME_STAT64_SYSCALL	1
# define __ASSUME_FCNTL64		1
# define __ASSUME_VFORK_SYSCALL		1
#endif

/* Beginning with 2.5.63 support for realtime and monotonic clocks and
   timers based on them is available.  */
#if __LINUX_KERNEL_VERSION >= 132415
# define __ASSUME_POSIX_TIMERS		1
#endif

/* The late 2.5 kernels saw a lot of new CLONE_* flags.  Summarize
   their availability with one define.  The changes were made first
   for i386 and the have to be done separately for the other archs.
   For ia64, s390*, PPC we pick 2.5.64 as the first version with support.  */
#if __LINUX_KERNEL_VERSION >= 132416 \
    && (defined __ia64__ || defined __s390__ || defined __powerpc__)
# define __ASSUME_CLONE_THREAD_FLAGS	1
#endif

/* With kernel 2.4.17 we always have netlink support.  */
#if __LINUX_KERNEL_VERSION >= (132096+17)
# define __ASSUME_NETLINK_SUPPORT	1
#endif
Commit	Line	Data
958f238f UD	1	/* Set flags signalling availability of kernel features based on given
958f238f UD	2	kernel version number.
ad0e8eb0	3	Copyright (C) 1999, 2000, 2001, 2002, 2003 Free Software Foundation, Inc.
958f238f UD	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
41bdb6e2 AJ	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.
958f238f UD	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
41bdb6e2	14	Lesser General Public License for more details.
958f238f	15
41bdb6e2 AJ	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. */
958f238f UD	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
958f238f UD	24	#ifndef __LINUX_KERNEL_VERSION
	25	/* We assume the worst; all kernels should be supported. */
	26	# define __LINUX_KERNEL_VERSION 0
	27	#endif
	28
	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.
	33
	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. */
	41
	42	/* `getcwd' system call. */
	43	#if __LINUX_KERNEL_VERSION >= 131584
	44	# define __ASSUME_GETCWD_SYSCALL 1
	45	#endif
	46
	47	/* Real-time signal became usable in 2.1.70. */
	48	#if __LINUX_KERNEL_VERSION >= 131398
	49	# define __ASSUME_REALTIME_SIGNALS 1
	50	#endif
	51
	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
	57
	58	/* When was `poll' introduced? */
	59	#if __LINUX_KERNEL_VERSION >= 131584
	60	# define __ASSUME_POLL_SYSCALL 1
	61	#endif
	62
	63	/* The `lchown' syscall was introduced in 2.1.80. */
	64	#if __LINUX_KERNEL_VERSION >= 131408
	65	# define __ASSUME_LCHOWN_SYSCALL 1
	66	#endif
	67
	68	/* When did the `setresuid' sysall became available? */
0482576e	69	#if __LINUX_KERNEL_VERSION >= 131584 && !defined __sparc__
958f238f UD	70	# define __ASSUME_SETRESUID_SYSCALL 1
958f238f UD	71	#endif
9a8fcca0 UD	72
	73	/* The SIOCGIFNAME ioctl is available starting with 2.1.50. */
	74	#if __LINUX_KERNEL_VERSION >= 131408
	75	# define __ASSUME_SIOCGIFNAME 1
	76	#endif
ecda4bda UD	77
	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
d587d83b UD	82
	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
	87
63a34b0f	88	/* On x86 the mmap2 syscall was introduced in 2.3.31. */
d587d83b UD	89	#if __LINUX_KERNEL_VERSION >= 131871 && defined __i386__
	90	# define __ASSUME_MMAP2_SYSCALL 1
	91	#endif
63a34b0f UD	92
	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
29332175	97
e3aaaa27	98	/* On sparc and ARM the truncate64/ftruncate64/mmap2/stat64/lstat64/fstat64
29332175	99	syscalls were introduced in 2.3.35. */
e3aaaa27	100	#if __LINUX_KERNEL_VERSION >= 131875 && (defined __sparc__ \|\| defined __arm__)
29332175 UD	101	# define __ASSUME_TRUNCATE64_SYSCALL 1
	102	# define __ASSUME_MMAP2_SYSCALL 1
	103	# define __ASSUME_STAT64_SYSCALL 1
	104	#endif
313fed01	105
51a8c49d	106	/* I know for sure that getrlimit are in 2.3.35 on powerpc. */
053cc7bb	107	#if __LINUX_KERNEL_VERSION >= 131875 && defined __powerpc__
51a8c49d RM	108	# define __ASSUME_NEW_GETRLIMIT_SYSCALL 1
	109	#endif
	110
330fad29	111	/* I know for sure that these are in 2.3.35 on powerpc. But PowerPC64 does not
51a8c49d RM	112	support separate 64-bit syscalls, already 64-bit */
	113	#if __LINUX_KERNEL_VERSION >= 131875 && defined __powerpc__ \
	114	&& !defined __powerpc64__
053cc7bb GK	115	# define __ASSUME_TRUNCATE64_SYSCALL 1
053cc7bb GK	116	# define __ASSUME_STAT64_SYSCALL 1
053cc7bb GK	117	#endif
053cc7bb GK	118
51a8c49d	119	/* Linux 2.3.39 introduced 32bit UID/GIDs. Some platforms had 32
a0386a0d	120	bit type all along. */
c5e38fac	121	#if __LINUX_KERNEL_VERSION >= 131879 \|\| defined __powerpc__ \|\| defined __mips__
313fed01 UD	122	# define __ASSUME_32BITUIDS 1
313fed01 UD	123	#endif
a074fa3c	124
51a8c49d RM	125	/* Linux 2.3.39 sparc added setresuid. */
51a8c49d RM	126	#if __LINUX_KERNEL_VERSION >= 131879 && defined __sparc__
330fad29	127	# define __ASSUME_SETRESUID_SYSCALL 1
51a8c49d RM	128	#endif
	129
	130	/* Linux 2.3.39 introduced IPC64. Except for powerpc. */
	131	#if __LINUX_KERNEL_VERSION >= 131879 && !defined __powerpc__
	132	# define __ASSUME_IPC64 1
	133	#endif
	134
	135	/* mips platforms had IPC64 all along. */
	136	#if defined __mips__
	137	# define __ASSUME_IPC64 1
	138	#endif
	139
330fad29	140	/* Linux 2.4.0 on PPC introduced a correct IPC64. But PowerPC64 does not
51a8c49d RM	141	support a separate 64-bit sys call, already 64-bit */
	142	#if __LINUX_KERNEL_VERSION >= 132096 && defined __powerpc__ \
	143	&& !defined __powerpc64__
a0386a0d UD	144	# define __ASSUME_IPC64 1
	145	#endif
	146
a074fa3c AJ	147	/* We can use the LDTs for threading with Linux 2.3.99 and newer. */
	148	#if __LINUX_KERNEL_VERSION >= 131939
	149	# define __ASSUME_LDT_WORKS 1
	150	#endif
56ddf355 UD	151
	152	/* The changed st_ino field appeared in 2.4.0-test6. But we cannot
	153	distinguish this version from other 2.4.0 releases. Therefore play
4863ed87	154	save and assume it available is for 2.4.1 and up. */
56ddf355 UD	155	#if __LINUX_KERNEL_VERSION >= 132097
	156	# define __ASSUME_ST_INO_64_BIT 1
	157	#endif
21f6a100 UD	158
	159	/* To support locking of large files a new fcntl() syscall was introduced
	160	in 2.4.0-test7. We test for 2.4.1 for the earliest version we know
	161	the syscall is available. */
f39b19c7	162	#if __LINUX_KERNEL_VERSION >= 132097 && (defined __i386__ \|\| defined __sparc__)
21f6a100 UD	163	# define __ASSUME_FCNTL64 1
21f6a100 UD	164	#endif
14860991	165
d37286c1	166	/* Arm got fcntl64 in 2.4.4, PowerPC and SH have it also in 2.4.4 (I
51a8c49d RM	167	don't know when it got introduced). But PowerPC64 does not support
51a8c49d RM	168	separate FCNTL64 call, FCNTL is already 64-bit */
5ee5d791	169	#if __LINUX_KERNEL_VERSION >= 132100 \
51a8c49d RM	170	&& (defined __arm__ \|\| defined __powerpc__ \|\| defined __sh__) \
51a8c49d RM	171	&& !defined __powerpc64__
d37286c1 AJ	172	# define __ASSUME_FCNTL64 1
	173	#endif
	174
14860991 UD	175	/* The getdents64 syscall was introduced in 2.4.0-test7. We test for
	176	2.4.1 for the earliest version we know the syscall is available. */
	177	#if __LINUX_KERNEL_VERSION >= 132097
	178	# define __ASSUME_GETDENTS64_SYSCALL 1
	179	#endif
675e4015 UD	180
	181	/* When did O_DIRECTORY became available? Early in 2.3 but when?
	182	Be safe, use 2.3.99. */
	183	#if __LINUX_KERNEL_VERSION >= 131939
7060e53e	184	# define __ASSUME_O_DIRECTORY 1
675e4015	185	#endif
4e56fdbc UD	186
	187	/* Starting with one of the 2.4.0 pre-releases the Linux kernel passes
	188	up the page size information. */
	189	#if __LINUX_KERNEL_VERSION >= 132097
7060e53e	190	# define __ASSUME_AT_PAGESIZE 1
4e56fdbc	191	#endif
390911be	192
846c6907 UD	193	/* Starting with at least 2.4.0 the kernel passes the uid/gid unconditionally
	194	up to the child. */
	195	#if __LINUX_KERNEL_VERSION >= 132097
	196	# define __ASSUME_AT_XID 1
	197	#endif
	198
b398ae3c UD	199	/* Starting with 2.4.5 kernels PPC passes the AUXV in the standard way
b398ae3c UD	200	and the vfork syscall made it into the official kernel. */
7060e53e AJ	201	#if __LINUX_KERNEL_VERSION >= (132096+5) && defined __powerpc__
7060e53e AJ	202	# define __ASSUME_STD_AUXV 1
b398ae3c	203	# define __ASSUME_VFORK_SYSCALL 1
51a8c49d RM	204	#endif
	205
	206	/* Starting with 2.4.5 kernels the mmap2 syscall made it into the official
	207	kernel. But PowerPC64 does not support a separate MMAP2 call. */
	208	#if __LINUX_KERNEL_VERSION >= (132096+5) && defined __powerpc__ \
	209	&& !defined __powerpc64__
7060e53e	210	# define __ASSUME_MMAP2_SYSCALL 1
390911be	211	#endif
c5e38fac	212
05856976	213	/* Starting with 2.4.21 PowerPC implements the new prctl syscall.
38e68573	214	This allows applications to get/set the Floating Point Exception Mode. */
05856976	215	#if __LINUX_KERNEL_VERSION >= (132096+21) && defined __powerpc__
38e68573 UD	216	# define __ASSUME_NEW_PRCTL_SYSCALL 1
	217	#endif
	218
	219	/* Starting with 2.4.21 PowerPC64 implements the new rt_sigreturn syscall.
	220	The new rt_sigreturn takes an ucontext pointer allowing rt_sigreturn
	221	to be used in the set/swapcontext implementation. */
	222	#if __LINUX_KERNEL_VERSION >= (132096+21) && defined __powerpc64__
	223	# define __ASSUME_NEW_RT_SIGRETURN_SYSCALL 1
	224	#endif
	225
0950889b	226	/* On x86, the set_thread_area syscall was introduced in 2.5.29, but its
05a51227	227	semantics was changed in 2.5.30, and again after 2.5.31. */
2a76f7ef	228	#if __LINUX_KERNEL_VERSION >= 132384 && defined __i386__
0950889b UD	229	# define __ASSUME_SET_THREAD_AREA_SYSCALL 1
	230	#endif
	231
8eed661a RM	232	/* The vfork syscall on x86 and arm was definitely available in 2.4. */
8eed661a RM	233	#if __LINUX_KERNEL_VERSION >= 132097 && (defined __i386__ \|\| defined __arm__)
885bc024 UD	234	# define __ASSUME_VFORK_SYSCALL 1
	235	#endif
	236
c5e38fac UD	237	/* There are an infinite number of PA-RISC kernel versions numbered
	238	2.4.0. But they've not really been released as such. We require
	239	and expect the final version here. */
	240	#ifdef __hppa__
	241	# define __ASSUME_32BITUIDS 1
	242	# define __ASSUME_TRUNCATE64_SYSCALL 1
	243	# define __ASSUME_MMAP2_SYSCALL 1
	244	# define __ASSUME_STAT64_SYSCALL 1
	245	# define __ASSUME_IPC64 1
	246	# define __ASSUME_ST_INO_64_BIT 1
	247	# define __ASSUME_FCNTL64 1
	248	# define __ASSUME_GETDENTS64_SYSCALL 1
	249	#endif
7d092b69	250
743f1874 AO	251	#if defined __mips__ && defined _ABIN32 && _MIPS_SIM == _ABIN32
	252	# define __ASSUME_FCNTL64 1
	253	#endif
	254
7d092b69 UD	255	/* The late 2.5 kernels saw a lot of new CLONE_* flags. Summarize
	256	their availability with one define. The changes were made first
	257	for i386 and the have to be done separately for the other archs.
	258	For i386 we pick 2.5.50 as the first version with support. */
74e8f2dc	259	#if __LINUX_KERNEL_VERSION >= 132402 && defined __i386__
7d092b69 UD	260	# define __ASSUME_CLONE_THREAD_FLAGS 1
7d092b69 UD	261	#endif
c2918f01 AS	262
	263	/* These features were surely available with 2.4.12. */
	264	#if __LINUX_KERNEL_VERSION >= 132108 && defined __mc68000__
	265	# define __ASSUME_MMAP2_SYSCALL 1
	266	# define __ASSUME_TRUNCATE64_SYSCALL 1
	267	# define __ASSUME_STAT64_SYSCALL 1
	268	# define __ASSUME_FCNTL64 1
	269	# define __ASSUME_VFORK_SYSCALL 1
	270	#endif
ad0e8eb0 UD	271
	272	/* Beginning with 2.5.63 support for realtime and monotonic clocks and
	273	timers based on them is available. */
	274	#if __LINUX_KERNEL_VERSION >= 132415
	275	# define __ASSUME_POSIX_TIMERS 1
	276	#endif
f006d3a0 UD	277
	278	/* The late 2.5 kernels saw a lot of new CLONE_* flags. Summarize
	279	their availability with one define. The changes were made first
	280	for i386 and the have to be done separately for the other archs.
7eecc0c2	281	For ia64, s390, PPC we pick 2.5.64 as the first version with support. /
f006d3a0	282	#if __LINUX_KERNEL_VERSION >= 132416 \
7eecc0c2	283	&& (defined __ia64__ \|\| defined __s390__ \|\| defined __powerpc__)
f006d3a0 UD	284	# define __ASSUME_CLONE_THREAD_FLAGS 1
f006d3a0 UD	285	#endif
e0c09a43 UD	286
	287	/* With kernel 2.4.17 we always have netlink support. */
	288	#if __LINUX_KERNEL_VERSION >= (132096+17)
	289	# define __ASSUME_NETLINK_SUPPORT 1
	290	#endif
	291