mirror of
git://sourceware.org/git/glibc.git
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7c65e9001b
* sysdeps/unix/sysv/linux/faccessat.c: Use syscall if available. * sysdeps/unix/sysv/linux/fchmodat.c: Likewise. * sysdeps/unix/sysv/linux/fchownat.c: Likewise. * sysdeps/unix/sysv/linux/futimesat.c: Likewise. * sysdeps/unix/sysv/linux/linkat.c: Likewise. * sysdeps/unix/sysv/linux/mkdirat.c: Likewise. * sysdeps/unix/sysv/linux/openat.c: Likewise. * sysdeps/unix/sysv/linux/readlinkat.c: Likewise. * sysdeps/unix/sysv/linux/renameat.c: Likewise. * sysdeps/unix/sysv/linux/symlinkat.c: Likewise. * sysdeps/unix/sysv/linux/unlinkat.c: Likewise. * sysdeps/unix/sysv/linux/xmknodat.c: Likewise. * sysdeps/unix/sysv/linux/wordsize-64/fxstatat.c: Likewise. * sysdeps/unix/sysv/linux/kernel-features.h: Define __ASSUME_PSELECT, __ASSUME_PPOLL, and __ASSUME_ATFCTS if possible. * io/ppoll.c: New file. * io/Makefile (routines): Add ppoll. (CFLAGS-ppoll.c): Define. * io/Versions: Export ppoll for GLIBC_2.4. * io/sys/poll.h: Declare ppoll. * sysdeps/unix/sysv/linux/ppoll.c: New file. * misc/pselect.c: Make it possible to include this file to define the generic code as a static function. * sysdeps/unix/sysv/linux/pselect.c: New file.
490 lines
17 KiB
C
490 lines
17 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) 1999-2003, 2004, 2005, 2006 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 Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the 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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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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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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#if defined __mips__
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# include <sgidefs.h>
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#endif
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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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/* MSG_NOSIGNAL was at least available with Linux 2.2.0. */
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#if __LINUX_KERNEL_VERSION >= 131584
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# define __ASSUME_MSG_NOSIGNAL 1
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#endif
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/* The sendfile syscall was introduced in 2.2.0. */
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#if __LINUX_KERNEL_VERSION >= 131584
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# define __ASSUME_SENDFILE 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 \
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&& ((defined __sparc__ && !defined __arch64__) || 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 getrlimit are in 2.3.35 on powerpc. */
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#if __LINUX_KERNEL_VERSION >= 131875 && defined __powerpc__
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# define __ASSUME_NEW_GETRLIMIT_SYSCALL 1
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#endif
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/* I know for sure that these are in 2.3.35 on powerpc. But PowerPC64 does not
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support separate 64-bit syscalls, already 64-bit */
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#if __LINUX_KERNEL_VERSION >= 131875 && defined __powerpc__ \
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&& !defined __powerpc64__
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# define __ASSUME_TRUNCATE64_SYSCALL 1
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# define __ASSUME_STAT64_SYSCALL 1
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#endif
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/* Linux 2.3.39 introduced 32bit UID/GIDs. 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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#endif
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/* Linux 2.3.39 sparc added setresuid. */
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#if __LINUX_KERNEL_VERSION >= 131879 && defined __sparc__
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# define __ASSUME_SETRESUID_SYSCALL 1
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#endif
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#if __LINUX_KERNEL_VERSION >= 131879
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# define __ASSUME_SETRESGID_SYSCALL 1
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#endif
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/* Linux 2.3.39 introduced IPC64. Except for powerpc. */
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#if __LINUX_KERNEL_VERSION >= 131879 && !defined __powerpc__
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# define __ASSUME_IPC64 1
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#endif
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/* MIPS platforms had IPC64 all along. */
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#if defined __mips__
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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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/* Linux 2.4.0 on PPC introduced a correct IPC64. But PowerPC64 does not
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support a separate 64-bit sys call, already 64-bit */
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#if __LINUX_KERNEL_VERSION >= 132096 && defined __powerpc__ \
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&& !defined __powerpc64__
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# define __ASSUME_IPC64 1
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#endif
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/* SH kernels got stat64, mmap2, and truncate64 during 2.4.0-test. */
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#if __LINUX_KERNEL_VERSION >= 132096 && defined __sh__
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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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/* 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. However, SH is lame,
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and still does not have a 64-bit inode field. */
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#if __LINUX_KERNEL_VERSION >= 132097 && !defined __alpha__ && !defined __sh__
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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 AT_CLKTCK auxiliary vector entry was introduction in the 2.4.0
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series. */
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#if __LINUX_KERNEL_VERSION >= 132097
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# define __ASSUME_AT_CLKTCK 1
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#endif
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/* Arm got fcntl64 in 2.4.4, PowerPC and SH have it also in 2.4.4 (I
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don't know when it got introduced). But PowerPC64 does not support
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separate FCNTL64 call, FCNTL is already 64-bit */
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#if __LINUX_KERNEL_VERSION >= 132100 \
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&& (defined __arm__ || defined __powerpc__ || defined __sh__) \
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&& !defined __powerpc64__
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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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/* Starting with at least 2.4.0 the kernel passes the uid/gid unconditionally
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up to the child. */
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#if __LINUX_KERNEL_VERSION >= 132097
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# define __ASSUME_AT_XID 1
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#endif
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/* Starting with 2.4.5 kernels PPC passes the AUXV in the standard way
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and the vfork syscall made it into the official kernel. */
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#if __LINUX_KERNEL_VERSION >= (132096+5) && defined __powerpc__
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# define __ASSUME_STD_AUXV 1
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# define __ASSUME_VFORK_SYSCALL 1
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#endif
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/* Starting with 2.4.5 kernels the mmap2 syscall made it into the official
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kernel. But PowerPC64 does not support a separate MMAP2 call. */
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#if __LINUX_KERNEL_VERSION >= (132096+5) && defined __powerpc__ \
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&& !defined __powerpc64__
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# define __ASSUME_MMAP2_SYSCALL 1
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#endif
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/* Starting with 2.4.21 PowerPC implements the new prctl syscall.
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This allows applications to get/set the Floating Point Exception Mode. */
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#if __LINUX_KERNEL_VERSION >= (132096+21) && defined __powerpc__
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# define __ASSUME_NEW_PRCTL_SYSCALL 1
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#endif
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/* Starting with 2.4.21 the PowerPC32 clone syscall works as expected. */
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#if __LINUX_KERNEL_VERSION >= (132096+21) && defined __powerpc__ \
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&& !defined __powerpc64__
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# define __ASSUME_FIXED_CLONE_SYSCALL 1
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#endif
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/* Starting with 2.4.21 PowerPC64 implements the new rt_sigreturn syscall.
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The new rt_sigreturn takes an ucontext pointer allowing rt_sigreturn
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to be used in the set/swapcontext implementation. */
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#if __LINUX_KERNEL_VERSION >= (132096+21) && defined __powerpc64__
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# define __ASSUME_NEW_RT_SIGRETURN_SYSCALL 1
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#endif
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/* On x86, the set_thread_area syscall was introduced in 2.5.29, but its
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semantics was changed in 2.5.30, and again after 2.5.31. */
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#if __LINUX_KERNEL_VERSION >= 132384 && defined __i386__
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# define __ASSUME_SET_THREAD_AREA_SYSCALL 1
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#endif
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/* The vfork syscall on x86 and arm was definitely available in 2.4. */
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#if __LINUX_KERNEL_VERSION >= 132097 && (defined __i386__ || defined __arm__)
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# define __ASSUME_VFORK_SYSCALL 1
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#endif
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/* There are an infinite number of PA-RISC kernel versions numbered
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2.4.0. But they've not really been released as such. We require
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and expect the final version here. */
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#ifdef __hppa__
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# define __ASSUME_32BITUIDS 1
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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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# define __ASSUME_IPC64 1
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# define __ASSUME_ST_INO_64_BIT 1
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# define __ASSUME_FCNTL64 1
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# define __ASSUME_GETDENTS64_SYSCALL 1
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#endif
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/* Alpha switched to a 64-bit timeval sometime before 2.2.0. */
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#if __LINUX_KERNEL_VERSION >= 131584 && defined __alpha__
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# define __ASSUME_TIMEVAL64 1
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#endif
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#if defined __mips__ && _MIPS_SIM == _ABIN32
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# define __ASSUME_FCNTL64 1
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#endif
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/* The late 2.5 kernels saw a lot of new CLONE_* flags. Summarize
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their availability with one define. The changes were made first
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for i386 and the have to be done separately for the other archs.
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For i386 we pick 2.5.50 as the first version with support. */
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#if __LINUX_KERNEL_VERSION >= 132402 && defined __i386__
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# define __ASSUME_CLONE_THREAD_FLAGS 1
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#endif
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/* These features were surely available with 2.4.12. */
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#if __LINUX_KERNEL_VERSION >= 132108 && defined __mc68000__
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# define __ASSUME_MMAP2_SYSCALL 1
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# define __ASSUME_TRUNCATE64_SYSCALL 1
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# define __ASSUME_STAT64_SYSCALL 1
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# define __ASSUME_FCNTL64 1
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# define __ASSUME_VFORK_SYSCALL 1
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#endif
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/* Beginning with 2.5.63 support for realtime and monotonic clocks and
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timers based on them is available. */
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#if __LINUX_KERNEL_VERSION >= 132415
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# define __ASSUME_POSIX_TIMERS 1
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#endif
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/* Beginning with 2.6.12 the clock and timer supports CPU clocks. */
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#if __LINUX_KERNEL_VERSION >= 0x2060c
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# define __ASSUME_POSIX_CPU_TIMERS 1
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#endif
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/* The late 2.5 kernels saw a lot of new CLONE_* flags. Summarize
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their availability with one define. The changes were made first
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for i386 and the have to be done separately for the other archs.
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For ia64, s390*, PPC, x86-64 we pick 2.5.64 as the first version
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with support. */
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#if __LINUX_KERNEL_VERSION >= 132416 \
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&& (defined __ia64__ || defined __s390__ || defined __powerpc__ \
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|| defined __x86_64__ || defined __sh__)
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# define __ASSUME_CLONE_THREAD_FLAGS 1
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#endif
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/* With kernel 2.4.17 we always have netlink support. */
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#if __LINUX_KERNEL_VERSION >= (132096+17)
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# define __ASSUME_NETLINK_SUPPORT 1
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#endif
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/* The requeue futex functionality was introduced in 2.5.70. */
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#if __LINUX_KERNEL_VERSION >= 132422
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# define __ASSUME_FUTEX_REQUEUE 1
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#endif
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/* The statfs64 syscalls are available in 2.5.74. */
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#if __LINUX_KERNEL_VERSION >= 132426
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# define __ASSUME_STATFS64 1
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#endif
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/* Starting with at least 2.5.74 the kernel passes the setuid-like exec
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flag unconditionally up to the child. */
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#if __LINUX_KERNEL_VERSION >= 132426
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# define __ASSUME_AT_SECURE 1
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#endif
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/* Starting with the 2.5.75 kernel the kernel fills in the correct value
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in the si_pid field passed as part of the siginfo_t struct to signal
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handlers. */
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#if __LINUX_KERNEL_VERSION >= 132427
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# define __ASSUME_CORRECT_SI_PID 1
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#endif
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/* The tgkill syscall was instroduced for i386 in 2.5.75. For Alpha
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it was introduced in 2.6.0-test1 which unfortunately cannot be
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distinguished from 2.6.0. On x86-64, ppc, and ppc64 it was
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introduced in 2.6.0-test3. */
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#if (__LINUX_KERNEL_VERSION >= 132427 && defined __i386__) \
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|| (__LINUX_KERNEL_VERSION >= 132609 && defined __alpha__) \
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|| (__LINUX_KERNEL_VERSION >= 132609 && defined __x86_64__) \
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|| (__LINUX_KERNEL_VERSION >= 132609 && defined __powerpc__) \
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|| (__LINUX_KERNEL_VERSION >= 132609 && defined __sh__)
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# define __ASSUME_TGKILL 1
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#endif
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/* The utimes syscall has been available for some architectures
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forever. For x86 it was introduced after 2.5.75, for x86-64,
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ppc, and ppc64 it was introduced in 2.6.0-test3. */
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#if defined __alpha__ || defined __ia64__ || defined __hppa__ \
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|| defined __sparc__ \
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|| (__LINUX_KERNEL_VERSION > 132427 && defined __i386__) \
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|| (__LINUX_KERNEL_VERSION > 132609 && defined __x86_64__) \
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|| (__LINUX_KERNEL_VERSION >= 132609 && defined __powerpc__) \
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|| (__LINUX_KERNEL_VERSION >= 132609 && defined __sh__)
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# define __ASSUME_UTIMES 1
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#endif
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// XXX Disabled for now since the semantics we want is not achieved.
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#if 0
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/* The CLONE_STOPPED flag was introduced in the 2.6.0-test1 series. */
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#if __LINUX_KERNEL_VERSION >= 132609
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# define __ASSUME_CLONE_STOPPED 1
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#endif
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#endif
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/* The fixed version of the posix_fadvise64 syscall appeared in
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2.6.0-test3. At least for x86. Powerpc support appeared in
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2.6.2, but for 32-bit userspace only. */
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#if (__LINUX_KERNEL_VERSION >= 132609 && defined __i386__) \
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|| (__LINUX_KERNEL_VERSION >= 132610 && defined __powerpc__ \
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&& !defined __powerpc64__)
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# define __ASSUME_FADVISE64_64_SYSCALL 1
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#endif
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/* The PROT_GROWSDOWN/PROT_GROWSUP flags were introduced in the 2.6.0-test
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series. */
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#if __LINUX_KERNEL_VERSION >= 132609
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# define __ASSUME_PROT_GROWSUPDOWN 1
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#endif
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/* Starting with 2.6.0 PowerPC adds signal/swapcontext support for Vector
|
|
SIMD (AKA Altivec, VMX) instructions and register state. This changes
|
|
the overall size of the sigcontext and adds the swapcontext syscall. */
|
|
#if __LINUX_KERNEL_VERSION >= 132608 && defined __powerpc__
|
|
# define __ASSUME_SWAPCONTEXT_SYSCALL 1
|
|
#endif
|
|
|
|
/* The CLONE_DETACHED flag is not necessary in 2.6.2 kernels, it is
|
|
implied. */
|
|
#if __LINUX_KERNEL_VERSION >= 132610
|
|
# define __ASSUME_NO_CLONE_DETACHED 1
|
|
#endif
|
|
|
|
/* Starting with version 2.6.4-rc1 the getdents syscall returns d_type
|
|
information as well and in between 2.6.5 and 2.6.8 most compat wrappers
|
|
were fixed too. Except s390{,x} which was fixed in 2.6.11. */
|
|
#if (__LINUX_KERNEL_VERSION >= 0x020608 && !defined __s390__) \
|
|
|| (__LINUX_KERNEL_VERSION >= 0x02060b && defined __s390__)
|
|
# define __ASSUME_GETDENTS32_D_TYPE 1
|
|
#endif
|
|
|
|
/* Starting with version 2.5.3, the initial location returned by `brk'
|
|
after exec is always rounded up to the next page. */
|
|
#if __LINUX_KERNEL_VERSION >= 132355
|
|
# define __ASSUME_BRK_PAGE_ROUNDED 1
|
|
#endif
|
|
|
|
/* Starting with version 2.6.9, the waitid system call is available.
|
|
Except for powerpc{,64} and s390{,x}, where it is available in 2.6.12. */
|
|
#if (__LINUX_KERNEL_VERSION >= 0x020609 \
|
|
&& !defined __powerpc__ && !defined __s390__) \
|
|
|| (__LINUX_KERNEL_VERSION >= 0x02060c \
|
|
&& (defined __powerpc__ || defined __s390__))
|
|
# define __ASSUME_WAITID_SYSCALL 1
|
|
#endif
|
|
|
|
/* Starting with version 2.6.9, SSI_IEEE_RAISE_EXCEPTION exists. */
|
|
#if __LINUX_KERNEL_VERSION >= 0x020609 && defined __alpha__
|
|
#define __ASSUME_IEEE_RAISE_EXCEPTION 1
|
|
#endif
|
|
|
|
/* On sparc64 stat64/lstat64/fstat64 syscalls were introduced in 2.6.12. */
|
|
#if __LINUX_KERNEL_VERSION >= 0x02060c && defined __sparc__ \
|
|
&& defined __arch64__
|
|
# define __ASSUME_STAT64_SYSCALL 1
|
|
#endif
|
|
|
|
/* Early kernel used "shm" as the filesystem name for the filesystem used
|
|
for shm_open etc. Later it is "tmpfs". 2.4.20 is a safe bet for the
|
|
cutover. */
|
|
#if __LINUX_KERNEL_VERSION >= 0x02041a
|
|
# define __ASSUME_TMPFS_NAME 1
|
|
#endif
|
|
|
|
/* pselect was introduced just after 2.6.16-rc1. Due to the way the
|
|
kernel versions are advertised we can only rely on 2.6.17 to have
|
|
the code. */
|
|
#if __LINUX_KERNEL_VERSION >= 0x020611 \
|
|
&& (defined __i386__ || defined __powerpc__)
|
|
# define __ASSUME_PSELECT 1
|
|
#endif
|
|
|
|
/* ppoll was introduced just after 2.6.16-rc1. Due to the way the
|
|
kernel versions are advertised we can only rely on 2.6.17 to have
|
|
the code. */
|
|
#if __LINUX_KERNEL_VERSION >= 0x020611 \
|
|
&& (defined __i386__ || defined __powerpc__)
|
|
# define __ASSUME_PPOLL 1
|
|
#endif
|
|
|
|
/* The *at syscalls were introduced just after 2.6.16-rc1. Due to the way the
|
|
kernel versions are advertised we can only rely on 2.6.17 to have
|
|
the code. */
|
|
#if __LINUX_KERNEL_VERSION >= 0x020611 \
|
|
&& (defined __i386__ || defined __x86_64__)
|
|
# define __ASSUME_ATFCTS 1
|
|
#endif
|