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gelf_newehdr(3) [freebsd man page]

GELF_NEWEHDR(3) 					   BSD Library Functions Manual 					   GELF_NEWEHDR(3)

NAME
elf32_newehdr, elf64_newehdr, gelf_newehdr -- retrieve or allocate the object file header LIBRARY
ELF Access Library (libelf, -lelf) SYNOPSIS
#include <libelf.h> Elf32_Ehdr * elf32_newehdr(Elf *elf); Elf64_Ehdr * elf64_newehdr(Elf *elf); #include <gelf.h> void * gelf_newehdr(Elf *elf, int elfclass); DESCRIPTION
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 follows: e_ident[EI_MAG0..EI_MAG3] Identification bytes at offsets EI_MAG0, EI_MAG1, EI_MAG2 and EI_MAG3 are set to the ELF signature. e_ident[EI_CLASS] 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(). e_ident[EI_DATA] The identification byte at offset EI_DATA is set to ELFDATANONE. e_ident[EI_VERSION] 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). e_machine is set to EM_NONE. e_type is set to ELF_K_NONE. e_version 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. RETURN VALUES
These functions return a pointer to a translated header descriptor if successful, or NULL on failure. ERRORS
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 operation. [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 being called. [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. SEE ALSO
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

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GELF_GETEHDR(3) 					   BSD Library Functions Manual 					   GELF_GETEHDR(3)

NAME
elf32_getehdr, elf64_getehdr, gelf_getehdr -- retrieve the object file header LIBRARY
ELF Access Library (libelf, -lelf) SYNOPSIS
#include <libelf.h> Elf32_Ehdr * elf32_getehdr(Elf *elf); Elf64_Ehdr * elf64_getehdr(Elf *elf); #include <gelf.h> GElf_Ehdr * gelf_getehdr(Elf *elf, GElf_Ehdr *dst); DESCRIPTION
These functions retrieve the ELF object file header from the ELF descriptor elf and return a translated header descriptor to their callers. Functions elf32_getehdr() and elf64_getehdr() return a pointer to the appropriate class-specific header descriptor if it exists in the file referenced by descriptor elf. These functions return NULL if an ELF header was not found in file elf. Function gelf_getehdr() stores a translated copy of the header for ELF file elf into the descriptor pointed to by argument dst. It returns argument dst if successful or NULL in case of failure. RETURN VALUES
These functions return a pointer to a translated header descriptor if successful, or NULL on failure. ERRORS
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 file. [ELF_E_ARGUMENT] The elf class of descriptor elf was not recognized. [ELF_E_ARGUMENT] Argument dst was null. [ELF_E_CLASS] The ELF class of descriptor elf did not match that of the API function being called. [ELF_E_HEADER] ELF descriptor elf does not have an associated header. [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. SEE ALSO
elf(3), elf32_newehdr(3), elf64_newehdr(3), elf_flagehdr(3), elf_getident(3), gelf(3), gelf_newehdr(3), elf(5) BSD
December 16, 2006 BSD

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