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GELF(3)		       FreeBSD Library Functions Manual		       GELF(3)

NAME
     GElf -- class-independent API for ELF manipulation

LIBRARY
     ELF Parsing Library (libelf, -lelf)

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 representation.
	 gelf_xlatetom()      Translate	from the file representation of	an ELF
			      data structure to	a native representation.

     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 descrip-
			      tor.
	 gelf_fsize()	      Retrieves	the size of the	file representation 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>.

FreeBSD	9.3		       September 1, 2006		   FreeBSD 9.3

NAME | LIBRARY | SYNOPSIS | DESCRIPTION | SEE ALSO | HISTORY | AUTHORS

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