ELF32_GETEHDR(3ELF) ELF Library Functions ELF32_GETEHDR(3ELF)


NAME


elf32_getehdr, elf32_newehdr, elf64_getehdr, elf64_newehdr - retrieve
class-dependent object file header

SYNOPSIS


cc [ flag ... ] file ... -lelf [ library ... ]
#include <libelf.h>

Elf32_Ehdr *elf32_getehdr(Elf *elf);


Elf32_Ehdr *elf32_newehdr(Elf *elf);


Elf64_Ehdr *elf64_getehdr(Elf *elf);


Elf64_Ehdr *elf64_newehdr(Elf *elf);


DESCRIPTION


For a 32-bit class file, elf32_getehdr() returns a pointer to an ELF
header, if one is available for the ELF descriptor elf. If no header
exists for the descriptor, elf32_newehdr() allocates a clean one, but it
otherwise behaves the same as elf32_getehdr(). It does not allocate a new
header if one exists already. If no header exists for elf32_getehdr(),
one cannot be created for elf32_newehdr(), a system error occurs, the
file is not a 32-bit class file, or elf is NULL, both functions return a
null pointer.


For the 64-bit class, replace 32 with 64 as appropriate.


The header includes the following members:

unsigned char e_ident[EI_NIDENT];
Elf32_Half e_type;
Elf32_Half e_machine;
Elf32_Word e_version;
Elf32_Addr e_entry;
Elf32_Off e_phoff;
Elf32_Off e_shoff;
Elf32_Word e_flags;
Elf32_Half e_ehsize;
Elf32_Half e_phentsize;
Elf32_Half e_phnum;
Elf32_Half e_shentsize;
Elf32_Half e_shnum;
Elf32_Half e_shstrndx;


The elf32_newehdr() function automatically sets the ELF_F_DIRTY bit. See
elf_flagdata(3ELF).


An application can use elf_getident() to inspect the identification bytes
from a file.


An application can use elf_getshnum() and elf_getshstrndx() to obtain
section header information. The location of this section header
information differs between standard ELF files to those that require
Extended Sections.

ATTRIBUTES


See attributes(5) for descriptions of the following attributes:


+--------------------+-----------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+--------------------+-----------------+
|Interface Stability | Stable |
+--------------------+-----------------+
|MT-Level | MT-Safe |
+--------------------+-----------------+

SEE ALSO


elf(3ELF), elf_begin(3ELF), elf_flagdata(3ELF), elf_getident(3ELF),
elf_getshnum(3ELF), elf_getshstrndx(3ELF), libelf(3LIB), attributes(5)


June 19, 2002 ELF32_GETEHDR(3ELF)