GELF_NEWEHDR(3) BSD Library Functions Manual GELF_NEWEHDR(3)
elf32_newehdr, elf64_newehdr, gelf_newehdr -- retrieve or allocate the object file header
gelf_newehdr(Elf *elf, int elfclass);
These functions retrieve the ELF header from the ELF descriptor elf, allocating a new header
if needed. File data structures are translated to their in-memory representations as
described in elf(3).
Function elf32_newehdr() returns a pointer to a 32 bit Elf32_Ehdr structure. Function
elf64_newehdr() returns a pointer to a 64 bit Elf64_Ehdr structure.
When argument elfclass has value ELFCLASS32, function gelf_newehdr() returns the value
returned by elf32_newehdr(elf). When argument elfclass has value ELFCLASS64 it returns the
value returned by elf64_newehdr(elf).
If a fresh header structure is allocated, the members of the structure are initialized as
Identification bytes at offsets EI_MAG0, EI_MAG1, EI_MAG2 and EI_MAG3 are set to the
The identification byte at offset EI_CLASS is set to the ELF class associated with
the function being called or to argument elfclass for function gelf_newehdr().
The identification byte at offset EI_DATA is set to ELFDATANONE.
The identification byte at offset EI_VERSION is set to the ELF library's operating
version set by a prior call to elf_version(3).
is set to EM_NONE.
e_type is set to ELF_K_NONE.
is set to the ELF library's operating version set by a prior call to elf_version(3).
Other members of the header are set to zero. The application is responsible for changing
these values as needed before calling elf_update().
If successful, these three functions set the ELF_F_DIRTY flag on ELF descriptor elf.
These functions return a pointer to a translated header descriptor if successful, or NULL on
These functions can fail with the following errors:
[ELF_E_ARGUMENT] The argument elf was null.
[ELF_E_ARGUMENT] Argument elf was not a descriptor for an ELF object.
[ELF_E_ARGUMENT] Argument elfclass had an unsupported value.
[ELF_E_ARGUMENT] The class of the ELF descriptor elf did not match that of the requested
[ELF_E_ARGUMENT] For function gelf_newehdr(), the class of argument elf was not
ELFCLASSNONE and did not match the argument elfclass.
[ELF_E_CLASS] The ELF class of descriptor elf did not match that of the API function
[ELF_E_HEADER] A malformed ELF header was detected.
[ELF_E_RESOURCE] An out of memory condition was detected during execution.
[ELF_E_SECTION] The ELF descriptor in argument elf did not adhere to the conventions used
for extended numbering.
[ELF_E_VERSION] The ELF descriptor elf had an unsupported ELF version number.
elf(3), elf32_getehdr(3), elf64_getehdr(3), elf_flagdata(3), elf_getident(3), elf_update(3),
elf_version(3), gelf(3), gelf_getehdr(3), elf(5)
BSD October 22, 2007 BSD