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+.\" Copyright (c) 2006,2008 Joseph Koshy.  All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\"
+.\" This software is provided by Joseph Koshy ``as is'' and
+.\" any express or implied warranties, including, but not limited to, the
+.\" implied warranties of merchantability and fitness for a particular purpose
+.\" are disclaimed.  in no event shall Joseph Koshy be liable
+.\" for any direct, indirect, incidental, special, exemplary, or consequential
+.\" damages (including, but not limited to, procurement of substitute goods
+.\" or services; loss of use, data, or profits; or business interruption)
+.\" however caused and on any theory of liability, whether in contract, strict
+.\" liability, or tort (including negligence or otherwise) arising in any way
+.\" out of the use of this software, even if advised of the possibility of
+.\" such damage.
+.\"
+.\" $Id: gelf_checksum.3 189 2008-07-20 10:38:08Z jkoshy $
+.\"
+.Dd August 29, 2006
+.Os
+.Dt GELF_CHECKSUM 3
+.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
+.Ar 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
+.Ar elf
+of class
+.Dv ELFCLASS32 .
+.Pp
+Function
+.Fn elf64_checksum
+returns a checksum for an ELF descriptor
+.Ar elf
+of class
+.Dv ELFCLASS64 .
+.Pp
+Function
+.Fn gelf_checksum
+provides a class-independent way retrieving the checksum
+for ELF object
+.Ar 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
+.Ar elf
+was NULL.
+.It Bq Er ELF_E_ARGUMENT
+Argument
+.Ar elf
+was not a descriptor for an ELF file.
+.It Bq Er ELF_E_ARGUMENT
+The ELF descriptor
+.Ar 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
+.Ar elf
+did not match the class of the called function.
+.It Bq Er ELF_E_HEADER
+The ELF object specified by argument
+.Ar 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
+.Ar 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