gelf_getsym,
gelf_update_sym —
read and update symbol information
ELF Access Library (libelf, -lelf)
#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);
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.
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.
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.
elf(3),
elf_getdata(3),
elf_getscn(3),
gelf(3),
gelf_getsyminfo(3),
gelf_update_syminfo(3)