ELFHASH(3E)                                                      ELFHASH(3E)



NAME
     elfhash - compute hash value

SYNOPSIS
     cc [flag ...] file ...  -lelf [library ...]

     #include <libelf.h>

     unsigned long elfhash(const char *name);


DESCRIPTION

     elfhash computes a hash value, given a null terminated string, name.

     The returned hash value, h, can be used as a bucket index, typically

     after computing h mod x to ensure appropriate bounds.


     Hash tables may be built on one machine and used on another because

     elfhash uses unsigned arithmetic to avoid possible differences in

     various machines' signed arithmetic.  Although name is shown as char*

     above, elfhash treats it as unsigned char* to avoid sign extension

     differences.  Using char* eliminates type conflicts with expressions such

     as elfhash("name").


     ELF files' symbol hash tables are computed using this function [see

     elfgetdata(3E) and elfxlate(3E)].  The hash value returned is

     guaranteed not to be the bit pattern of all ones (~0UL).


SEE ALSO

     elf(3E), elfgetdata(3E), elfxlate(3E).




























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