ELF_FLAGDATA(3)

NAME
elf_flagdata, elf_flagehdr, elf_flagelf, elf_flagphdr, elf_flagscn, elf_flagshdr - manipulate flags associated with ELF(3) data structures

LIBRARY
libelf

SYNOPSIS
#include <libelf.h>
unsigned int
elf_flagdata(Elf_Data *data, Elf_Cmd cmd, unsigned int flags);
unsigned int
elf_flagehdr(Elf *elf, Elf_Cmd cmd, unsigned int flags);
unsigned int
elf_flagelf(Elf *elf, Elf_Cmd cmd, unsigned int flags);
unsigned int
elf_flagphdr(Elf *elf, Elf_Cmd cmd, unsigned int flags);
unsigned int
elf_flagscn(Elf_Scn *scn, Elf_Cmd cmd, unsigned int flags);
unsigned int
elf_flagshdr(Elf_Scn *scn, Elf_Cmd cmd, unsigned int flags);

DESCRIPTION
These functions are used to query, set or reset flags on data structures associated with an ELF file.

Arguments data, elf and scn denote the data structures whose flags need to be changed. These values are allowed to be NULL to simplify error handling in application code.

Argument cmd may have the following values:

ELF_C_CLR
    The argument flags specifies the flags to be cleared.

ELF_C_SET
    The argument flags specifies the flags to be set.

The argument flags is allowed to have the following flags set:

ELF_F_DIRTY
    Mark the associated data structure as needing to be written back to the underlying file. A subsequent call to elf_update(3) will resynchronize the library's internal data structures.

ELF_F_LAYOUT
    This flag is only valid with the elf_flagelf() API. It informs the library that the application will take responsibility for the layout of the file and that the library is not to insert any padding in between sections.

Marking a given data structure as “dirty” affects all of its contained elements. Thus marking an ELF descriptor elf with elf_flagelf(elf, ELF_C_SET, ELF_F_DIRTY) means that the entire contents of the descriptor are “dirty”.

Using a value of zero for argument flags will return the current set of flags for the data structure being queried.

RETURN VALUES
These functions return the updated flags is successful, and zero if an error is detected.

ERRORS
These functions may fail with the following errors:

[ELF_E_ARGUMENT]
    An unsupported value was used for the cmd argument.

[ELF_E_ARGUMENT]
    Argument flags had unsupported flags set.

[ELF_E_ARGUMENT]
    The argument elf was not a descriptor for an ELF object.

[ELF_E_SEQUENCE]
    Function elf_flagehdr() was called without an executable header being allocated.

[ELF_E_SEQUENCE]
    Function elf_flagphdr() was called without a program header being allocated.

SEE ALSO
elf(3), elf32_newehdr(3), elf32_newphdr(3), elf32_newshdr(3), elf64_newehdr(3), elf64_newphdr(3), elf64_newshdr(3), elf_newdata(3), elf_update(3), gelf(3), gelf_newehdr(3), gelf_newphdr(3), gelf_newshdr(3), gelf_update_dyn(3), gelf_update_move(3), gelf_update_rel(3), gelf_update_rela(3), gelf_update_sym(3), gelf_update_syminfo(3)