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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_update_ehdr.3 189 2008-07-20 10:38:08Z jkoshy $
.\"
.Dd August 27, 2006
.Os
.Dt GELF_UPDATE_EHDR 3
.Sh NAME
.Nm gelf_update_ehdr ,
.Nm gelf_update_phdr ,
.Nm gelf_update_shdr
.Nd update underlying ELF data structures
.Sh LIBRARY
.Lb libelf
.Sh SYNOPSIS
.In gelf.h
.Ft int
.Fn gelf_update_ehdr "Elf *elf" "GElf_Ehdr *ehdr"
.Ft int
.Fn gelf_update_phdr "Elf *elf" "int ndx" "GElf_Phdr *phdr"
.Ft int
.Fn gelf_update_shdr "Elf_Scn *scn" "GElf_Shdr *shdr"
.Sh DESCRIPTION
These functions are used to update ELF data structures on the underlying
ELF descriptor.
Class-dependent data structures in the underlying ELF descriptor
are updated using the data in the class-independent GElf descriptors
and the underlying ELF data structures are marked
.Dq dirty .
The conversion process signals an error if the values being copied
to the target ELF data structure would exceed representation
limits.
GElf descriptors are described in
.Xr gelf 3 .
.Pp
Function
.Fn gelf_update_ehdr
updates the ELF Executable Header with the values in the
class-independent executable header
.Ar ehdr .
.Pp
Function
.Fn gelf_update_phdr
updates the ELF Program Header structure at index
.Ar ndx
with the values in the class-independent program header
.Ar phdr .
.Pp
Function
.Fn gelf_update_shdr
updates the ELF Section Header structure associated with section
descriptor
.Ar scn
with the values in argument
.Ar shdr .
.Sh RETURN VALUES
These functions return a non-zero integer on success, or zero in case
of an error.
.Sh ERRORS
These functions may fail with the following errors:
.Bl -tag -width "[ELF_E_RESOURCE]"
.It Bq Er ELF_E_ARGUMENT
Arguments
.Ar elf ,
.Ar ehdr ,
.Ar phdr ,
.Ar scn ,
or
.Ar shdr
were NULL.
.It Bq Er ELF_E_ARGUMENT
Argument
.Ar elf
was not a descriptor for an ELF object.
.It Bq Er ELF_E_ARGUMENT
Argument
.Ar elf
had an unsupported ELF class.
.It Bq Er ELF_E_ARGUMENT
Argument
.Ar ndx
exceeded the number of entries in the program header table.
.It Bq Er ELF_E_ARGUMENT
Section descriptor
.Ar scn
was not associated with an ELF descriptor.
.It Bq Er ELF_E_MODE
ELF descriptor
.Ar elf
was not opened for writing or updating.
.It Bq Er ELF_E_RESOURCE
An out of memory condition was detected.
.El
.Sh SEE ALSO
.Xr elf 3 ,
.Xr elf_flagelf 3 ,
.Xr elf_flagphdr 3 ,
.Xr elf_flagshdr 3 ,
.Xr gelf 3 ,
.Xr gelf_getehdr 3 ,
.Xr gelf_getphdr 3 ,
.Xr gelf_getshdr 3
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