ELF_HASH(3ELF) ELF Library Functions ELF_HASH(3ELF)


NAME


elf_hash - compute hash value

SYNOPSIS


cc [ flag ... ] file ... -lelf [ library ... ]
#include <libelf.h>

unsigned long elf_hash(const char *name);


DESCRIPTION


The elf_hash() function 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
elf_hash() uses unsigned arithmetic to avoid possible differences in
various machines' signed arithmetic. Although name is shown as char*
above, elf_hash() treats it as unsigned char* to avoid sign extension
differences. Using char* eliminates type conflicts with expressions such
as elf_hash(name).


ELF files' symbol hash tables are computed using this function (see
elf_getdata(3ELF) and elf32_xlatetof(3ELF)). The hash value returned is
guaranteed not to be the bit pattern of all ones ( ~0UL).

ATTRIBUTES


See attributes(5) for descriptions of the following attributes:


+--------------------+-----------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+--------------------+-----------------+
|Interface Stability | Stable |
+--------------------+-----------------+
|MT-Level | MT-Safe |
+--------------------+-----------------+

SEE ALSO


elf(3ELF), elf32_xlatetof(3ELF), elf_getdata(3ELF), libelf(3LIB),
attributes(5)


July 11, 2001 ELF_HASH(3ELF)