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);
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.
See attributes(5) for descriptions of the following attributes:
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
| Interface Stability | Stable |
| MT-Level | MT-Safe |
elf(3ELF), elf_begin(3ELF), elf_flagdata(3ELF), elf_getident(3ELF), elf_getshnum(3ELF), elf_getshstrndx(3ELF), libelf(3LIB), attributes(5)