GELF_GETREL(3) BSD Library Functions Manual GELF_GETREL(3)NAME
gelf_getrel, gelf_update_rel — read and update ELF relocation entries
LIBRARY
library “libelf”
SYNOPSIS
#include <gelf.h>
GElf_Rel *
gelf_getrel(Elf_Data *data, int ndx, GElf_Rel *rel);
int
gelf_update_rel(Elf_Data *data, int ndx, GElf_Rel *rel);
DESCRIPTION
These convenience functions are used to retrieve and update class-depen‐
dent Elf32_Rel or Elf64_Rel structures in an ELF object.
Argument data is an Elf_Data descriptor associated with a section of type
SHT_REL. Argument ndx is the index of the entry being retrieved or
updated. The class-independent GElf_Rel structure is described in
gelf(3).
Function gelf_getrel() retrieves the class-dependent entry at index ndx
in data buffer data and copies it to the destination pointed to by argu‐
ment rel after translation to class-independent form.
Function gelf_update_rel() converts the class-independent entry pointed
to by argument rel to class-dependent form, and writes it to the entry at
index ndx in the data buffer described by argument data. Function
gelf_update_rel() signals an error if any of the values in the class-
independent representation exceeds the representable limits of the target
type.
RETURN VALUES
Function gelf_getrel() returns the value of argument rel if successful,
or NULL in case of an error. Function gelf_update_rel() returns a non-
zero value if successful, or zero in case of an error.
ERRORS
These functions may fail with the following errors:
[ELF_E_ARGUMENT] Arguments data or rel were NULL.
[ELF_E_ARGUMENT] Argument ndx was less than zero or larger than the num‐
ber of entries in the data descriptor.
[ELF_E_ARGUMENT] Data descriptor data was not associated with a section
of type SHT_REL.
[ELF_E_RANGE] A value was not representable in the target type.
SEE ALSOelf(3), elf_getdata(3), elf_getscn(3), gelf(3)BSD August 29, 2006 BSD
