GELF_GETSYM(3) | Library Functions Manual | GELF_GETSYM(3)

# NAME

`gelf_getsym`, `gelf_update_sym` —
read and update symbol information

# LIBRARY

ELF Access Library (libelf, -lelf)

# SYNOPSIS

`#include <gelf.h>`

GElf_Sym *
`gelf_getsym`(Elf_Data *data, int ndx, GElf_Sym *sym);

int
`gelf_update_sym`(Elf_Data *data, int ndx, GElf_Sym *sym);

# DESCRIPTION

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.

# SEE ALSO

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

August 29, 2006 | NetBSD 9.0