\"      $NetBSD: gelf_checksum.3,v 1.6 2024/03/03 17:37:33 christos Exp $
\"
\" Copyright (c) 2006,2008 Joseph Koshy.  All rights reserved.
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\" This software is provided by Joseph Koshy ``as is'' and
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\" are disclaimed.  in no event shall Joseph Koshy be liable
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\" Id: gelf_checksum.3 3958 2022-03-12 14:31:32Z jkoshy
\"
Dd August 29, 2006
Dt GELF_CHECKSUM 3
Os
Sh NAME
Nm elf32_checksum ,
Nm elf64_checksum ,
Nm gelf_checksum
Nd return the checksum of an ELF object
Sh LIBRARY
Lb libelf
Sh SYNOPSIS
In libelf.h
Ft long
Fn elf32_checksum "Elf *elf"
Ft long
Fn elf64_checksum "Elf *elf"
In gelf.h
Ft long
Fn gelf_checksum "Elf *elf"
Sh DESCRIPTION
These functions return a simple checksum of the ELF object described
by their argument
Fa elf .
The checksum is computed in way that allows its value to remain
unchanged in presence of modifications to the ELF object by utilities
like
Xr strip 1 .
Pp
Function
Fn elf32_checksum
returns a checksum for an ELF descriptor
Fa elf
of class
Dv ELFCLASS32 .
Pp
Function
Fn elf64_checksum
returns a checksum for an ELF descriptor
Fa elf
of class
Dv ELFCLASS64 .
Pp
Function
Fn gelf_checksum
provides a class-independent way retrieving the checksum
for ELF object
Fa elf .
Sh RETURN VALUES
These functions return the checksum of the ELF object, or zero in case
an error was encountered.
Sh ERRORS
These functions may fail with the following errors:
Bl -tag -width "[ELF_E_RESOURCE]"
It Bq Er ELF_E_ARGUMENT
Argument
Fa elf
was
Dv NULL .
It Bq Er ELF_E_ARGUMENT
Argument
Fa elf
was not a descriptor for an ELF file.
It Bq Er ELF_E_ARGUMENT
The ELF descriptor
Fa elf
was not opened for reading or updating.
It Bq Er ELF_E_CLASS
For functions
Fn elf32_checksum
and
Fn elf64_checksum ,
ELF descriptor
Fa elf
did not match the class of the called function.
It Bq Er ELF_E_HEADER
The ELF object specified by argument
Fa elf
had a malformed executable header.
It Bq Er ELF_E_RESOURCE
An out of memory condition was detected during processing.
It Bq Er ELF_E_SECTION
The ELF object specified by argument
Fa elf
contained a section with a malformed section header.
It Bq Er ELF_E_VERSION
The ELF object was of an unsupported version.
El
Sh SEE ALSO
Xr strip 1 ,
Xr elf 3 ,
Xr gelf 3

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