gelf_getsym3

Usage

Library

library “libelf”

Overview

These convenience functions are used to retrieve and update class-dependent Elf32_Sym and Elf64_Sym structures in an ELF object.

Argument data is an Elf_Data descriptor associated with a section of type SHT_SYMTAB, SHT_DYNSYM or SHT_GNU_versym. Argument ndx is the index of the symbol being retrieved or updated. The class-independent GElf_Sym structure is described in gelf(3).

Function gelf_getsym() retrieves class-dependent symbol information at index ndx in data buffer data and copies it to the destination pointed to by argument sym after translation to class-independent form.

Function gelf_update_sym() converts the class-independent symbol information pointed to by argument sym to class-dependent form, and writes it to the symbol entry at index ndx in the data buffer described by argument data. Function gelf_update_sym() 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_getsym() returns the value of argument sym if successful, or NULL in case of an error. Function gelf_update_sym() 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 sym were NULL.

[ELF_E_ARGUMENT]

Argument ndx was less than zero or larger than the number of symbols in the data descriptor.

[ELF_E_ARGUMENT]

Data descriptor data was not associated with a section containing symbol information.

[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.