ELF_GETIDENT(3E)ELF_GETIDENT(3E)NAMEelf_getident - retrieve file identification data
SYNOPSIS
cc [flag ...] file ... -lelf [library ...]
#include <libelf.h>
char *elf_getident(Elf *elf, size_t *ptr);
DESCRIPTION
As elf(3E) explains, ELF provides a framework for various classes of
files, where basic objects may have 32 bits, 64 bits, etc. To
accommodate these differences, without forcing the larger sizes on
smaller machines, the initial bytes in an ELF file hold identification
information common to all file classes. Every ELF header's e_ident has
EI_NIDENT bytes with the following interpretation.
e_ident Index Value Purpose
__________________________________________________
EI_MAG0 ELFMAG0
EI_MAG1 ELFMAG1
EI_MAG2 ELFMAG2
EI_MAG3 ELFMAG3 File identification
__________________________________________________
ELFCLASSNONE
ELFCLASS32
EI_CLASS ELFCLASS64 File class
__________________________________________________
ELFDATANONE
ELFDATA2LSB
EI_DATA ELFDATA2MSB Data encoding
__________________________________________________
EI_VERSION EV_CURRENT File version
__________________________________________________
7-15 0 Unused, set to zero
__________________________________________________
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Other kinds of files [see elf_kind(3E)] also may have identification
data, though they would not conform to e_ident.
elf_getident returns a pointer to the file's ``initial bytes.'' If the
library recognizes the file, a conversion from the file image to the
memory image may occur. In any case, the identification bytes are
guaranteed not to have been modified, though the size of the unmodified
area depends on the file type. If ptr is non-null, the library stores
the number of identification bytes in the location to which ptr points.
If no data are present, elf is null, or an error occurs, the return value
is a null pointer, with zero optionally stored through ptr.
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ELF_GETIDENT(3E)ELF_GETIDENT(3E)SEE ALSOelf(3E), elf_begin(3E), elf_getehdr(3E), elf_kind(3E), elf_rawfile(3E).
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