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GELF(3)			 BSD Library Functions Manual		       GELF(3)

NAME
     GElf — class-independent API for ELF manipulation

LIBRARY
     library “libelf”

SYNOPSIS
     #include <gelf.h>

DESCRIPTION
     This manual page describes a class independent API for manipulating ELF
     objects.  This API allows an application to operate on ELF descriptors
     without needing to the know the ELF class of the descriptor.

     The GElf API may be used alongside the ELF API without restriction.

   GElf Data Structures
     The GElf API defines the following class-independent data structures:

     GElf_Addr	  A representation of ELF addresses.

     GElf_Dyn	  A class-independent representation of ELF .dynamic section
		  entries.

     GElf_Ehdr	  A class-independent representation of an ELF Executable
		  Header.

     GElf_Half	  An unsigned 16 bit quantity.

     GElf_Off	  A class-independent representation of a ELF offset.

     GElf_Phdr	  A class-independent representation of an ELF Program Header
		  Table entry.

     GElf_Rel	  A class-independent representation of an ELF relocation
		  entry.

     GElf_Rela	  A class-independent representation of an ELF relocation
		  entry with addend.

     GElf_Shdr	  A class-independent representation of an ELF Section Header
		  Table entry.

     GElf_Sword	  A signed 32 bit quantity.

     GElf_Sxword  A signed 64 bit quantity.

     GElf_Sym	  A class-independent representation of an ELF symbol table
		  entry.

     GElf_Word	  An unsigned 32 bit quantity.

     GElf_Xword	  An unsigned 64 bit quantity.

     These data structures are sized to be compatible with the corresponding
     64 bit ELF structures, and have the same internal structure as their 64
     bit class-dependent counterparts.	Class-dependent ELF structures are
     described in elf(5).

   GElf Programming Model
     GElf functions always return a copy of the underlying (class-dependent)
     ELF data structure.  The programming model with GElf is as follows:

     1.	  An application will retrieve data from an ELF descriptor using a
	  gelf_get_*() function.  This will copy out data into a private
	  GElf_* data structure.

     2.	  The application will work with its private copy of the GElf struc‐
	  ture.

     3.	  Once done, the application copies the new values back to the under‐
	  lying ELF data structure using the gelf_update_*() functions.

     4.	  The application will then use the elf_flag*() APIs to indicate to
	  the ELF library that an ELF data structure is dirty.

     When updating an underlying 32 bit ELF data structure, the GElf routines
     will signal an error if a GElf value is out of range for the underlying
     ELF data type.

   Namespace use
     The GElf interface uses the following symbols:

     GElf_*	   Class-independent data types.

     gelf_*	   For functions defined in the API set.

   GElf Programming APIs
     This section provides an overview of the GElf programming APIs.  Further
     information is provided in the manual page of each function listed here.

     Allocating ELF Data Structures
		   gelf_newehdr()    Allocate a new ELF Executable Header.
		   gelf_newphdr()    Allocate a new ELF Program Header Table.

     Data Translation
		   gelf_xlatetof()   Translate the native representation of an
				     ELF data structure to its file represen‐
				     tation.
		   gelf_xlatetom()   Translate from the file representation of
				     an ELF data structure to a native repre‐
				     sentation.

     Retrieving ELF Data
		   gelf_getdyn()     Retrieve an ELF .dynamic table entry.
		   gelf_getehdr()    Retrieve an ELF Executable Header from
				     the underlying ELF descriptor.
		   gelf_getphdr()    Retrieve an ELF Program Header Table
				     entry from the underlying ELF descriptor.
		   gelf_getrel()     Retrieve an ELF relocation entry.
		   gelf_getrela()    Retrieve an ELF relocation entry with
				     addend.
		   gelf_getshdr()    Retrieve an ELF Section Header Table
				     entry from the underlying ELF descriptor.
		   gelf_getsym()     Retrieve an ELF symbol table entry.

     Queries
		   gelf_checksum()   Retrieves the ELF checksum for an ELF
				     descriptor.
		   gelf_fsize()	     Retrieves the size of the file represen‐
				     tation of an ELF type.
		   gelf_getclass()   Retrieves the ELF class of an ELF
				     descriptor.

     Updating ELF Data
		   gelf_update_dyn()   Copy back an ELF .dynamic Table entry.
		   gelf_update_phdr()  Copy back an ELF Program Header Table
				       entry.
		   gelf_update_rel()   Copy back an ELF relocation entry.
		   gelf_update_rela()  Copy back an ELF relocation with addend
				       entry.
		   gelf_update_shdr()  Copy back an ELF Section Header Table
				       entry.
		   gelf_update_sym()   Copy back an ELF symbol table entry.

SEE ALSO
     elf(3), elf(5)

HISTORY
     The GELF(3) API first appeared in System V Release 4.  This implementa‐
     tion of the API first appeared in FreeBSD 7.0.

AUTHORS
     The GElf API was implemented by Joseph Koshy ⟨jkoshy@FreeBSD.org⟩.

BSD			       September 1, 2006			   BSD

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