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.