\" $NetBSD: gelf_getphdr.3,v 1.6 2024/03/03 17:37:34 christos Exp $

\" $NetBSD: gelf_getphdr.3,v 1.6 2024/03/03 17:37:34 christos Exp $
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\" Copyright (c) 2006-2008 Joseph Koshy. All rights reserved.
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\" are disclaimed. in no event shall Joseph Koshy be liable
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\" Id: gelf_getphdr.3 3958 2022-03-12 14:31:32Z jkoshy
\"
Dd October 21, 2007
Dt GELF_GETPHDR 3
Os
Sh NAME
Nm elf32_getphdr ,
Nm elf64_getphdr ,
Nm gelf_getphdr
Nd retrieve an ELF program header table
Sh LIBRARY
Lb libelf
Sh SYNOPSIS
In libelf.h
Ft "Elf32_Phdr *"
Fn elf32_getphdr "Elf *elf"
Ft "Elf64_Phdr *"
Fn elf64_getphdr "Elf *elf"
In gelf.h
Ft "GElf_Phdr *"
Fn gelf_getphdr "Elf *elf" "int index" "GElf_Phdr *dst"
Sh DESCRIPTION
These functions retrieve and translate ELF program header information
from an ELF descriptor, if this information exists.
Pp
Functions
Fn elf32_getphdr
and
Fn elf64_getphdr
return a pointer to an array of translated
Vt Elf32_Phdr
and
Vt Elf64_Phdr
descriptors respectively.
These descriptors are described in
Xr elf 5 .
The number of entries in this array may be determined using the
Xr elf_getphnum 3
function.
Pp
Function
Fn gelf_getphdr
will retrieve the program header table entry at index
Fa index
from ELF descriptor
Fa elf .
The translated program header table entry will be written to the
address pointed to be argument
Fa dst .
Pp
Applications may inform the library of modifications to a program header table entry
by using the
Xr elf_flagphdr 3
API.
Applications using the
Xr gelf 3
interface need to use the
Xr gelf_update_phdr 3
API to copy modifications to a program header entry back to the underlying
ELF descriptor.
Sh RETURN VALUES
The functions a valid pointer if successful, or
Dv NULL
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 object.
It Bq Er ELF_E_ARGUMENT
Argument
Fa dst
was
Dv NULL .
It Bq Er ELF_E_ARGUMENT
Index
Fa index
was out of range.
It Bq Er ELF_E_CLASS
The class of ELF descriptor
Fa elf
did not match the expected class of the function being called.
It Bq Er ELF_E_HEADER
ELF descriptor
Fa elf
did not possess an executable header.
It Bq Er ELF_E_HEADER
ELF descriptor
Fa elf
had a corrupt executable header.
It Bq Er ELF_E_RESOURCE
An out of memory condition was detected.
It Bq Er ELF_E_SECTION
The ELF descriptor in argument
Fa elf
did not adhere to the conventions used for extended numbering.
It Bq Er ELF_VERSION
ELF descriptor
Fa elf
was of an unsupported version.
El
Sh SEE ALSO
Xr elf 3 ,
Xr elf32_getehdr 3 ,
Xr elf32_newphdr 3 ,
Xr elf64_getehdr 3 ,
Xr elf64_newphdr 3 ,
Xr elf_flagphdr 3 ,
Xr elf_getphnum 3 ,
Xr gelf 3 ,
Xr gelf_getehdr 3 ,
Xr gelf_newphdr 3 ,
Xr gelf_update_phdr 3 ,
Xr elf 5