Current File : //usr/man/man3elf/elf_hash.3elf

'\" te
.\"  Copyright 1989 AT&T Copyright (c) 1989, 2014, Oracle and/or its affiliates. All rights reserved.
.TH elf_hash 3ELF "8 September 2014" "SunOS 5.11" "ELF Library Functions"
.SH NAME
elf_hash \- compute hash value
.SH SYNOPSIS
.LP
.nf
cc [ \fIflag\fR ... ] \fIfile\fR ... \fB-lelf\fR [ \fIlibrary\fR ... ]
#include <libelf.h>

\fBulong_t\fR \fBelf_hash\fR(\fBconst char *\fR\fIname\fR);
.fi

.SH DESCRIPTION
.sp
.LP
The \fBelf_hash()\fR function computes a hash value, given a null terminated string, \fIname\fR. The returned hash value, \fIh\fR, can be used as a bucket index, typically after computing \fIh\fR mod x to ensure appropriate bounds.
.sp
.LP
Hash tables may be built on one machine and used on another because \fBelf_hash()\fR uses unsigned arithmetic to avoid possible  differences in various machines' signed arithmetic. Although \fIname\fR is shown as \fBchar*\fR above, \fBelf_hash()\fR treats it as \fBunsigned char*\fR to avoid sign extension differences. Using \fBchar*\fR eliminates type conflicts with expressions such as \fBelf_hash(\fR\fIname\fR\fB).\fR
.sp
.LP
\fBELF\fR files' symbol hash tables are computed using this function (see \fBelf_getdata\fR(3ELF) and \fBelf32_xlatetof\fR(3ELF)). The hash value returned is guaranteed not to be the bit pattern of all ones ( \fB~0UL\fR).
.SH ATTRIBUTES
.sp
.LP
See \fBattributes\fR(5) for descriptions of the following attributes:
.sp

.sp
.TS
tab() box;
cw(2.75i) |cw(2.75i) 
lw(2.75i) |lw(2.75i) 
.
ATTRIBUTE TYPEATTRIBUTE VALUE
_
Interface StabilityCommitted
_
MT-LevelMT-Safe
.TE

.SH SEE ALSO
.sp
.LP
\fBelf\fR(3ELF), \fBelf32_xlatetof\fR(3ELF), \fBelf_getdata\fR(3ELF), \fBlibelf\fR(3LIB), \fBattributes\fR(5)