'\" te
.\"  Copyright 1989 AT&T  Copyright (c) 2001, Sun Microsystems, Inc.  All Rights Reserved
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.TH ELF_HASH 3ELF "Jul 11, 2001"
.SH NAME
elf_hash \- compute hash value
.SH SYNOPSIS
.LP
.nf
cc [ \fIflag\fR ... ] \fIfile\fR ... \fB-lelf\fR [ \fIlibrary\fR ... ]
#include <libelf.h>

\fBunsigned long\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 \fRmod 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
box;
c | c
l | l .
ATTRIBUTE TYPE	ATTRIBUTE VALUE
_
Interface Stability	Stable
_
MT-Level	MT-Safe
.TE

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