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-dependent 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 argument 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 number 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.
- [
ELF_E_VERSION] - The Elf_Data descriptor denoted by argument data is associated with an ELF object with an unsupported version.