Merging upstream version 6.8.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 0 insertions, 272 deletions

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-'\" t
-.\" Copyright 2012 Michael Kerrisk <mtk.manpages@gmail.com>
-.\"
-.\" SPDX-License-Identifier: Linux-man-pages-copyleft
-.\"
-.\" See also https://lwn.net/Articles/519085/
-.\"
-.TH getauxval 3 2023-10-31 "Linux man-pages 6.7"
-.SH NAME
-getauxval \- retrieve a value from the auxiliary vector
-.SH LIBRARY
-Standard C library
-.RI ( libc ", " \-lc )
-.SH SYNOPSIS
-.nf
-.B #include <sys/auxv.h>
-.P
-.BI "unsigned long getauxval(unsigned long " type );
-.fi
-.SH DESCRIPTION
-The
-.BR getauxval ()
-function retrieves values from the auxiliary vector,
-a mechanism that the kernel's ELF binary loader
-uses to pass certain information to
-user space when a program is executed.
-.P
-Each entry in the auxiliary vector consists of a pair of values:
-a type that identifies what this entry represents,
-and a value for that type.
-Given the argument
-.IR type ,
-.BR getauxval ()
-returns the corresponding value.
-.P
-The value returned for each
-.I type
-is given in the following list.
-Not all
-.I type
-values are present on all architectures.
-.TP
-.B AT_BASE
-The base address of the program interpreter (usually, the dynamic linker).
-.TP
-.B AT_BASE_PLATFORM
-A pointer to a string (PowerPC and MIPS only).
-On PowerPC, this identifies the real platform; may differ from
-.BR AT_PLATFORM "."
-On MIPS,
-.\" commit e585b768da111f2c2d413de6214e83bbdfee8f22
-this identifies the ISA level (since Linux 5.7).
-.TP
-.B AT_CLKTCK
-The frequency with which
-.BR times (2)
-counts.
-This value can also be obtained via
-.IR sysconf(_SC_CLK_TCK) .
-.TP
-.B AT_DCACHEBSIZE
-The data cache block size.
-.TP
-.B AT_EGID
-The effective group ID of the thread.
-.TP
-.B AT_ENTRY
-The entry address of the executable.
-.TP
-.B AT_EUID
-The effective user ID of the thread.
-.TP
-.B AT_EXECFD
-File descriptor of program.
-.TP
-.B AT_EXECFN
-A pointer to a string containing the pathname used to execute the program.
-.TP
-.B AT_FLAGS
-Flags (unused).
-.TP
-.B AT_FPUCW
-Used FPU control word (SuperH architecture only).
-This gives some information about the FPU initialization
-performed by the kernel.
-.TP
-.B AT_GID
-The real group ID of the thread.
-.TP
-.B AT_HWCAP
-An architecture and ABI dependent bit-mask whose settings
-indicate detailed processor capabilities.
-The contents of the bit mask are hardware dependent
-(for example, see the kernel source file
-.I arch/x86/include/asm/cpufeature.h
-for details relating to the Intel x86 architecture; the value
-returned is the first 32-bit word of the array described there).
-A human-readable version of the same information is available via
-.IR /proc/cpuinfo .
-.TP
-.BR AT_HWCAP2 " (since glibc 2.18)"
-Further machine-dependent hints about processor capabilities.
-.TP
-.B AT_ICACHEBSIZE
-The instruction cache block size.
-.\" .TP
-.\" .BR AT_IGNORE
-.\" .TP
-.\" .BR AT_IGNOREPPC
-.\" .TP
-.\" .BR AT_NOTELF
-.TP
-.\" Kernel commit 98a5f361b8625c6f4841d6ba013bbf0e80d08147
-.B AT_L1D_CACHEGEOMETRY
-Geometry of the L1 data cache, encoded with the cache line size in bytes
-in the bottom 16 bits and the cache associativity in the next 16 bits.
-The associativity is such that if N is the 16-bit value,
-the cache is N-way set associative.
-.TP
-.B AT_L1D_CACHESIZE
-The L1 data cache size.
-.TP
-.B AT_L1I_CACHEGEOMETRY
-Geometry of the L1 instruction cache, encoded as for
-.BR AT_L1D_CACHEGEOMETRY .
-.TP
-.B AT_L1I_CACHESIZE
-The L1 instruction cache size.
-.TP
-.B AT_L2_CACHEGEOMETRY
-Geometry of the L2 cache, encoded as for
-.BR AT_L1D_CACHEGEOMETRY .
-.TP
-.B AT_L2_CACHESIZE
-The L2 cache size.
-.TP
-.B AT_L3_CACHEGEOMETRY
-Geometry of the L3 cache, encoded as for
-.BR AT_L1D_CACHEGEOMETRY .
-.TP
-.B AT_L3_CACHESIZE
-The L3 cache size.
-.TP
-.B AT_PAGESZ
-The system page size (the same value returned by
-.IR sysconf(_SC_PAGESIZE) ).
-.TP
-.B AT_PHDR
-The address of the program headers of the executable.
-.TP
-.B AT_PHENT
-The size of program header entry.
-.TP
-.B AT_PHNUM
-The number of program headers.
-.TP
-.B AT_PLATFORM
-A pointer to a string that identifies the hardware platform
-that the program is running on.
-The dynamic linker uses this in the interpretation of
-.I rpath
-values.
-.TP
-.B AT_RANDOM
-The address of sixteen bytes containing a random value.
-.TP
-.B AT_SECURE
-Has a nonzero value if this executable should be treated securely.
-Most commonly, a nonzero value indicates that the process is
-executing a set-user-ID or set-group-ID binary
-(so that its real and effective UIDs or GIDs differ from one another),
-or that it gained capabilities by executing
-a binary file that has capabilities (see
-.BR capabilities (7)).
-Alternatively,
-a nonzero value may be triggered by a Linux Security Module.
-When this value is nonzero,
-the dynamic linker disables the use of certain environment variables (see
-.BR ld\-linux.so (8))
-and glibc changes other aspects of its behavior.
-(See also
-.BR secure_getenv (3).)
-.TP
-.B AT_SYSINFO
-The entry point to the system call function in the vDSO.
-Not present/needed on all architectures (e.g., absent on x86-64).
-.TP
-.B AT_SYSINFO_EHDR
-The address of a page containing the virtual Dynamic Shared Object (vDSO)
-that the kernel creates in order to provide fast implementations of
-certain system calls.
-.TP
-.B AT_UCACHEBSIZE
-The unified cache block size.
-.TP
-.B AT_UID
-The real user ID of the thread.
-.SH RETURN VALUE
-On success,
-.BR getauxval ()
-returns the value corresponding to
-.IR type .
-If
-.I type
-is not found, 0 is returned.
-.SH ERRORS
-.TP
-.BR ENOENT " (since glibc 2.19)"
-.\" commit b9ab448f980e296eac21ac65f53783967cc6037b
-No entry corresponding to
-.I type
-could be found in the auxiliary vector.
-.SH ATTRIBUTES
-For an explanation of the terms used in this section, see
-.BR attributes (7).
-.TS
-allbox;
-lbx lb lb
-l l l.
-Interface	Attribute	Value
-T{
-.na
-.nh
-.BR getauxval ()
-T}	Thread safety	MT-Safe
-.TE
-.SH STANDARDS
-GNU.
-.SH HISTORY
-glibc 2.16.
-.SH NOTES
-The primary consumer of the information in the auxiliary vector
-is the dynamic linker,
-.BR ld\-linux.so (8).
-The auxiliary vector is a convenient and efficient shortcut
-that allows the kernel to communicate a certain set of standard
-information that the dynamic linker usually or always needs.
-In some cases, the same information could be obtained by system calls,
-but using the auxiliary vector is cheaper.
-.P
-The auxiliary vector resides just above the argument list and
-environment in the process address space.
-The auxiliary vector supplied to a program can be viewed by setting the
-.B LD_SHOW_AUXV
-environment variable when running a program:
-.P
-.in +4n
-.EX
-$ LD_SHOW_AUXV=1 sleep 1
-.EE
-.in
-.P
-The auxiliary vector of any process can (subject to file permissions)
-be obtained via
-.IR /proc/ pid /auxv ;
-see
-.BR proc (5)
-for more information.
-.SH BUGS
-Before the addition of the
-.B ENOENT
-error in glibc 2.19,
-there was no way to unambiguously distinguish the case where
-.I type
-could not be found from the case where the value corresponding to
-.I type
-was zero.
-.SH SEE ALSO
-.BR execve (2),
-.BR secure_getenv (3),
-.BR vdso (7),
-.BR ld\-linux.so (8)