GELF_GETRELA(3)

GELF_GETRELA(3) | Library Functions Manual | GELF_GETRELA(3)

# NAME

`gelf_getrela`, `gelf_update_rela` —
read and update ELF relocation entries with addends

# LIBRARY

ELF Access Library (libelf, -lelf)

# SYNOPSIS

`#include <gelf.h>`

GElf_Rela *
`gelf_getrela`(Elf_Data *data, int ndx, GElf_Rela *rela);

int
`gelf_update_rela`(Elf_Data *data, int ndx, GElf_Rela *rela);

# DESCRIPTION

These convenience functions are used to retrieve and update class-dependent Elf32_Rela or Elf64_Rela structures in an ELF object.

Argument data is an Elf_Data descriptor associated with a section of type `SHT_RELA`. Argument ndx is the index of the entry being retrieved or updated. The class-independent GElf_Rela structure is described in gelf(3).

Function `gelf_getrela`() retrieves the class-dependent entry at index ndx in data buffer data and copies it to the destination pointed to by argument rela after translation to class-independent form.

Function `gelf_update_rela`() converts the class-independent entry pointed to by argument rela to class-dependent form, and writes it to the entry at index ndx in the data buffer described by argument data. Function `gelf_update_rela`() 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_getrela`() returns the value of argument rela if successful, or NULL in case of an error. Function `gelf_update_rela`() 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 rela 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_RELA`.
[`ELF_E_RANGE`]
  A value was not representable in the target type.

# SEE ALSO

elf(3), elf_getdata(3), elf_getscn(3), gelf(3)

August 29, 2006 | NetBSD 9.5