2006-11-11 17:16:35 +00:00
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.\" Copyright (c) 2006 Joseph Koshy. All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" This software is provided by Joseph Koshy ``as is'' and
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.\" any express or implied warranties, including, but not limited to, the
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.\" implied warranties of merchantability and fitness for a particular purpose
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.\" are disclaimed. in no event shall Joseph Koshy be liable
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.\" for any direct, indirect, incidental, special, exemplary, or consequential
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.\" damages (including, but not limited to, procurement of substitute goods
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.\" or services; loss of use, data, or profits; or business interruption)
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.\" however caused and on any theory of liability, whether in contract, strict
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.\" liability, or tort (including negligence or otherwise) arising in any way
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.\" out of the use of this software, even if advised of the possibility of
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.\" such damage.
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.\"
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.\" $FreeBSD$
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.\"
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.Dd August 29, 2006
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.Os
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2006-11-13 09:46:16 +00:00
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.Dt GELF_CHECKSUM 3
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2006-11-11 17:16:35 +00:00
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.Sh NAME
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.Nm elf32_checksum ,
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.Nm elf64_checksum ,
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.Nm gelf_checksum
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.Nd return the checksum of an ELF object
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.Sh LIBRARY
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.Lb libelf
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.Sh SYNOPSIS
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.In libelf.h
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.Ft long
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.Fn elf32_checksum "Elf *elf"
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.Ft long
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.Fn elf64_checksum "Elf *elf"
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.In gelf.h
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.Ft long
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.Fn gelf_checksum "Elf *elf"
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.Sh DESCRIPTION
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These functions return a simple checksum of the ELF object described
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by their argument
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.Ar elf .
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The checksum is computed in way that allows its value to remain
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unchanged in presence of modifications to the ELF object by utilities
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like
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.Xr strip 1 .
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.Pp
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Function
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.Fn elf32_checksum
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returns a checksum for an ELF descriptor
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.Ar elf
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of class
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.Dv ELFCLASS32 .
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.Pp
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Function
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.Fn elf64_checksum
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returns a checksum for an ELF descriptor
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.Ar elf
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of class
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.Dv ELFCLASS64 .
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.Pp
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Function
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.Fn gelf_checksum
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provides a class-independent way retrieving the checksum
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for ELF object
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.Ar elf .
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.Sh RETURN VALUES
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These functions return the checksum of the ELF object, or zero in case
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an error was encountered.
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.Sh ERRORS
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These functions may fail with the following errors:
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.Bl -tag -width "[ELF_E_RESOURCE]"
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.It Bq Er ELF_E_ARGUMENT
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Argument
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.Ar elf
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was NULL.
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.It Bq Er ELF_E_ARGUMENT
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Argument
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.Ar elf
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was not a descriptor for an ELF file.
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.It Bq Er ELF_E_ARGUMENT
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The ELF descriptor
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.Ar elf
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was not opened for reading or updating.
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.It Bq Er ELF_E_CLASS
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For functions
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.Fn elf32_checksum
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and
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.Fn elf64_checksum ,
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ELF descriptor
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.Ar elf
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did not match the class of the called function.
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.It Bq Er ELF_E_HEADER
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The ELF object specified by argument
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.Ar elf
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had a malformed executable header.
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.It Bq Er ELF_E_RESOURCE
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An out of memory condition was detected during processing.
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.It Bq Er ELF_E_SECTION
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The ELF object specified by argument
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.Ar elf
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contained a section with a malformed section header.
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.It Bq Er ELF_E_VERSION
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The ELF object was of an unsupported version.
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.El
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.Sh SEE ALSO
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.Xr strip 1 ,
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.Xr elf 3 ,
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2006-11-13 09:46:16 +00:00
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.Xr gelf 3
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