[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 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 these are in 2.3.35 on powerpc.  */
#if __LINUX_KERNEL_VERSION >= 131875 && defined __powerpc__
# define __ASSUME_TRUNCATE64_SYSCALL	1
# define __ASSUME_STAT64_SYSCALL	1
# define __ASSUME_NEW_GETRLIMIT_SYSCALL	1
#endif

/* Linux 2.3.39 introduced 32bit UID/GIDs and IPC64.  Some platforms had 32
   bit type all along.  */
#if __LINUX_KERNEL_VERSION >= 131879 || defined __powerpc__ || defined __mips__
# define __ASSUME_32BITUIDS		1
# ifndef __powerpc__
#  define __ASSUME_IPC64		1
# endif
# ifdef __sparc__
#  define __ASSUME_SETRESUID_SYSCALL	1
# endif
#endif

/* Linux 2.4.0 on PPC introduced a correct IPC64.  */
#if __LINUX_KERNEL_VERSION >= 132096 && defined __powerpc__
# 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).  */
#if __LINUX_KERNEL_VERSION >= 132100 \
    && (defined __arm__ || defined __powerpc__ || defined __sh__)
# 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 2.4.5 kernels PPC passes the AUXV in the standard way
   and the mmap2 syscall made it into the official kernel.  */
#if __LINUX_KERNEL_VERSION >= (132096+5) && defined __powerpc__
# define __ASSUME_STD_AUXV		1
# define __ASSUME_MMAP2_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
Commit	Line	Data
958f238f UD	1	/* Set flags signalling availability of kernel features based on given
958f238f UD	2	kernel version number.
4e56fdbc	3	Copyright (C) 1999, 2000, 2001 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
053cc7bb GK	106	/* I know for sure that these are in 2.3.35 on powerpc. */
	107	#if __LINUX_KERNEL_VERSION >= 131875 && defined __powerpc__
	108	# define __ASSUME_TRUNCATE64_SYSCALL 1
	109	# define __ASSUME_STAT64_SYSCALL 1
	110	# define __ASSUME_NEW_GETRLIMIT_SYSCALL 1
	111	#endif
	112
a0386a0d UD	113	/* Linux 2.3.39 introduced 32bit UID/GIDs and IPC64. Some platforms had 32
a0386a0d UD	114	bit type all along. */
c5e38fac	115	#if __LINUX_KERNEL_VERSION >= 131879 \|\| defined __powerpc__ \|\| defined __mips__
313fed01	116	# define __ASSUME_32BITUIDS 1
a0386a0d UD	117	# ifndef __powerpc__
	118	# define __ASSUME_IPC64 1
	119	# endif
0482576e UD	120	# ifdef __sparc__
	121	# define __ASSUME_SETRESUID_SYSCALL 1
	122	# endif
313fed01	123	#endif
a074fa3c	124
a0386a0d UD	125	/* Linux 2.4.0 on PPC introduced a correct IPC64. */
	126	#if __LINUX_KERNEL_VERSION >= 132096 && defined __powerpc__
	127	# define __ASSUME_IPC64 1
	128	#endif
	129
a074fa3c AJ	130	/* We can use the LDTs for threading with Linux 2.3.99 and newer. */
	131	#if __LINUX_KERNEL_VERSION >= 131939
	132	# define __ASSUME_LDT_WORKS 1
	133	#endif
56ddf355 UD	134
	135	/* The changed st_ino field appeared in 2.4.0-test6. But we cannot
	136	distinguish this version from other 2.4.0 releases. Therefore play
4863ed87	137	save and assume it available is for 2.4.1 and up. */
56ddf355 UD	138	#if __LINUX_KERNEL_VERSION >= 132097
	139	# define __ASSUME_ST_INO_64_BIT 1
	140	#endif
21f6a100 UD	141
	142	/* To support locking of large files a new fcntl() syscall was introduced
	143	in 2.4.0-test7. We test for 2.4.1 for the earliest version we know
	144	the syscall is available. */
f39b19c7	145	#if __LINUX_KERNEL_VERSION >= 132097 && (defined __i386__ \|\| defined __sparc__)
21f6a100 UD	146	# define __ASSUME_FCNTL64 1
21f6a100 UD	147	#endif
14860991	148
d37286c1 AJ	149	/* Arm got fcntl64 in 2.4.4, PowerPC and SH have it also in 2.4.4 (I
d37286c1 AJ	150	don't know when it got introduced). */
5ee5d791	151	#if __LINUX_KERNEL_VERSION >= 132100 \
d37286c1 AJ	152	&& (defined __arm__ \|\| defined __powerpc__ \|\| defined __sh__)
	153	# define __ASSUME_FCNTL64 1
	154	#endif
	155
14860991 UD	156	/* The getdents64 syscall was introduced in 2.4.0-test7. We test for
	157	2.4.1 for the earliest version we know the syscall is available. */
	158	#if __LINUX_KERNEL_VERSION >= 132097
	159	# define __ASSUME_GETDENTS64_SYSCALL 1
	160	#endif
675e4015 UD	161
	162	/* When did O_DIRECTORY became available? Early in 2.3 but when?
	163	Be safe, use 2.3.99. */
	164	#if __LINUX_KERNEL_VERSION >= 131939
7060e53e	165	# define __ASSUME_O_DIRECTORY 1
675e4015	166	#endif
4e56fdbc UD	167
	168	/* Starting with one of the 2.4.0 pre-releases the Linux kernel passes
	169	up the page size information. */
	170	#if __LINUX_KERNEL_VERSION >= 132097
7060e53e	171	# define __ASSUME_AT_PAGESIZE 1
4e56fdbc	172	#endif
390911be	173
7060e53e AJ	174	/* Starting with 2.4.5 kernels PPC passes the AUXV in the standard way
	175	and the mmap2 syscall made it into the official kernel. */
	176	#if __LINUX_KERNEL_VERSION >= (132096+5) && defined __powerpc__
	177	# define __ASSUME_STD_AUXV 1
	178	# define __ASSUME_MMAP2_SYSCALL 1
390911be	179	#endif
c5e38fac UD	180
	181	/* There are an infinite number of PA-RISC kernel versions numbered
	182	2.4.0. But they've not really been released as such. We require
	183	and expect the final version here. */
	184	#ifdef __hppa__
	185	# define __ASSUME_32BITUIDS 1
	186	# define __ASSUME_TRUNCATE64_SYSCALL 1
	187	# define __ASSUME_MMAP2_SYSCALL 1
	188	# define __ASSUME_STAT64_SYSCALL 1
	189	# define __ASSUME_IPC64 1
	190	# define __ASSUME_ST_INO_64_BIT 1
	191	# define __ASSUME_FCNTL64 1
	192	# define __ASSUME_GETDENTS64_SYSCALL 1
	193	#endif