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4e56fdbce3
* sysdeps/generic/dl-sysdep.c (_dl_sysdep_start): If HAVE_AUX_XID is defined don't look whether the AT_*ID values were set. If HAVE_AUX_PAGESIZE is defined don't look whether the pagesize is set. (_dl_show_auxv): Rewrite to avoid switch statement. * sysdeps/unix/sysv/linux/kernel-features.h: Define __ASSUME_AT_PAGESIZE for kernel >= 2.4.1. * sysdeps/unix/sysv/linux/ldsodefs.h: Define HAVE_AUX_XID. Define HAVE_AUX_PAGESIZE if __ASSUME_AT_PAGESIZE is defined.
166 lines
5.8 KiB
C
166 lines
5.8 KiB
C
/* Set flags signalling availability of kernel features based on given
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kernel version number.
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Copyright (C) 1999, 2000, 2001 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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/* This file must not contain any C code. At least it must be protected
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to allow using the file also in assembler files. */
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#ifndef __LINUX_KERNEL_VERSION
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/* We assume the worst; all kernels should be supported. */
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# define __LINUX_KERNEL_VERSION 0
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#endif
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/* We assume for __LINUX_KERNEL_VERSION the same encoding used in
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linux/version.h. I.e., the major, minor, and subminor all get a
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byte with the major number being in the highest byte. This means
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we can do numeric comparisons.
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In the following we will define certain symbols depending on
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whether the describes kernel feature is available in the kernel
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version given by __LINUX_KERNEL_VERSION. We are not always exactly
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recording the correct versions in which the features were
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introduced. If somebody cares these values can afterwards be
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corrected. Most of the numbers here are set corresponding to
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2.2.0. */
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/* `getcwd' system call. */
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#if __LINUX_KERNEL_VERSION >= 131584
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# define __ASSUME_GETCWD_SYSCALL 1
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#endif
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/* Real-time signal became usable in 2.1.70. */
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#if __LINUX_KERNEL_VERSION >= 131398
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# define __ASSUME_REALTIME_SIGNALS 1
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#endif
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/* When were the `pread'/`pwrite' syscalls introduced? */
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#if __LINUX_KERNEL_VERSION >= 131584
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# define __ASSUME_PREAD_SYSCALL 1
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# define __ASSUME_PWRITE_SYSCALL 1
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#endif
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/* When was `poll' introduced? */
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#if __LINUX_KERNEL_VERSION >= 131584
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# define __ASSUME_POLL_SYSCALL 1
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#endif
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/* The `lchown' syscall was introduced in 2.1.80. */
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#if __LINUX_KERNEL_VERSION >= 131408
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# define __ASSUME_LCHOWN_SYSCALL 1
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#endif
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/* When did the `setresuid' sysall became available? */
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#if __LINUX_KERNEL_VERSION >= 131584 && !defined __sparc__
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# define __ASSUME_SETRESUID_SYSCALL 1
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#endif
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/* The SIOCGIFNAME ioctl is available starting with 2.1.50. */
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#if __LINUX_KERNEL_VERSION >= 131408
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# define __ASSUME_SIOCGIFNAME 1
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#endif
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/* On x86 another `getrlimit' syscall was added in 2.3.25. */
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#if __LINUX_KERNEL_VERSION >= 131865 && defined __i386__
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# define __ASSUME_NEW_GETRLIMIT_SYSCALL 1
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#endif
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/* On x86 the truncate64/ftruncate64 syscalls were introduced in 2.3.31. */
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#if __LINUX_KERNEL_VERSION >= 131871 && defined __i386__
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# define __ASSUME_TRUNCATE64_SYSCALL 1
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#endif
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/* On x86 the mmap2 syscall was introduced in 2.3.31. */
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#if __LINUX_KERNEL_VERSION >= 131871 && defined __i386__
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# define __ASSUME_MMAP2_SYSCALL 1
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#endif
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/* On x86 the stat64/lstat64/fstat64 syscalls were introduced in 2.3.34. */
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#if __LINUX_KERNEL_VERSION >= 131874 && defined __i386__
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# define __ASSUME_STAT64_SYSCALL 1
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#endif
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/* On sparc and ARM the truncate64/ftruncate64/mmap2/stat64/lstat64/fstat64
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syscalls were introduced in 2.3.35. */
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#if __LINUX_KERNEL_VERSION >= 131875 && (defined __sparc__ || defined __arm__)
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# define __ASSUME_TRUNCATE64_SYSCALL 1
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# define __ASSUME_MMAP2_SYSCALL 1
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# define __ASSUME_STAT64_SYSCALL 1
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#endif
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/* I know for sure that these are in 2.3.35 on powerpc. */
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#if __LINUX_KERNEL_VERSION >= 131875 && defined __powerpc__
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# define __ASSUME_TRUNCATE64_SYSCALL 1
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# define __ASSUME_STAT64_SYSCALL 1
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# define __ASSUME_NEW_GETRLIMIT_SYSCALL 1
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#endif
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/* Linux 2.3.39 introduced 32bit UID/GIDs and IPC64. Some platforms had 32
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bit type all along. */
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#if __LINUX_KERNEL_VERSION >= 131879 || defined __powerpc__ || defined __mips__
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# define __ASSUME_32BITUIDS 1
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# ifndef __powerpc__
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# define __ASSUME_IPC64 1
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# endif
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# ifdef __sparc__
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# define __ASSUME_SETRESUID_SYSCALL 1
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# endif
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#endif
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/* Linux 2.4.0 on PPC introduced a correct IPC64. */
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#if __LINUX_KERNEL_VERSION >= 132096 && defined __powerpc__
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# define __ASSUME_IPC64 1
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#endif
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/* We can use the LDTs for threading with Linux 2.3.99 and newer. */
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#if __LINUX_KERNEL_VERSION >= 131939
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# define __ASSUME_LDT_WORKS 1
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#endif
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/* The changed st_ino field appeared in 2.4.0-test6. But we cannot
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distinguish this version from other 2.4.0 releases. Therefore play
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save and assume it available is for 2.4.1 and up. */
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#if __LINUX_KERNEL_VERSION >= 132097
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# define __ASSUME_ST_INO_64_BIT 1
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#endif
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/* To support locking of large files a new fcntl() syscall was introduced
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in 2.4.0-test7. We test for 2.4.1 for the earliest version we know
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the syscall is available. */
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#if __LINUX_KERNEL_VERSION >= 132097 && (defined __i386__ || defined __sparc__)
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# define __ASSUME_FCNTL64 1
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#endif
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/* The getdents64 syscall was introduced in 2.4.0-test7. We test for
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2.4.1 for the earliest version we know the syscall is available. */
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#if __LINUX_KERNEL_VERSION >= 132097
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# define __ASSUME_GETDENTS64_SYSCALL 1
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#endif
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/* When did O_DIRECTORY became available? Early in 2.3 but when?
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Be safe, use 2.3.99. */
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#if __LINUX_KERNEL_VERSION >= 131939
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# define __ASSUME_O_DIRECTORY 1
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#endif
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/* Starting with one of the 2.4.0 pre-releases the Linux kernel passes
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up the page size information. */
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#if __LINUX_KERNEL_VERSION >= 132097
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# define __ASSUME_AT_PAGESIZE 1
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#endif
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