NAME
gelf_getsym,
gelf_update_sym —
read and update symbol
information
LIBRARY
library “libelf”
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)