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elf_flagdata(3ELF)	     ELF Library Functions	    elf_flagdata(3ELF)

NAME
       elf_flagdata,  elf_flagehdr,  elf_flagelf,  elf_flagphdr,  elf_flagscn,
       elf_flagshdr - manipulate flags

SYNOPSIS
       cc [ flag ... ] file ... -lelf [ library ... ]
       #include <libelf.h>

       unsigned elf_flagdata(Elf_Data *data, Elf_Cmd cmd, unsigned flags);

       unsigned elf_flagehdr(Elf *elf, Elf_Cmd cmd, unsigned flags);

       unsigned elf_flagelf(Elf *elf, Elf_Cmd cmd, unsigned flags);

       unsigned elf_flagphdr(Elf *elf, Elf_Cmd cmd, unsigned flags);

       unsigned elf_flagscn(Elf_Scn *scn, Elf_Cmd cmd, unsigned flags);

       unsigned elf_flagshdr(Elf_Scn *scn, Elf_Cmd cmd, unsigned flags);

DESCRIPTION
       These functions manipulate the flags associated with various structures
       of  an  ELF  file.  Given  an  ELF  descriptor (elf), a data descriptor
       (data), or a section descriptor (scn), the functions may set  or	 clear
       the associated status bits, returning the updated bits. A null descrip‐
       tor is allowed, to simplify error handling; all functions return 0  for
       this degenerate case.

       cmd may have the following values:

       ELF_C_CLR    The	 functions  clear the bits that are asserted in flags.
		    Only the non-zero bits in flags are cleared; zero bits  do
		    not change the status of the descriptor.

       ELF_C_SET    The	 functions  set	 the  bits that are asserted in flags.
		    Only the non-zero bits in flags are set; zero bits do  not
		    change the status of the descriptor.

       Descriptions of the defined flags bits appear below:

       ELF_F_DIRTY     When  the  program  intends  to write an ELF file, this
		       flag asserts the associated  information	 needs	to  be
		       written	to the file. Thus, for example, a program that
		       wished to update the ELF header	of  an	existing  file
		       would  call  elf_flagehdr()  with this bit set in flags
		       and  cmd	 equal	to  ELF_C_SET.	 A   later   call   to
		       elf_update() would write the marked header to the file.

       ELF_F_LAYOUT    Normally,  the library decides how to arrange an output
		       file. That is, it automatically decides where to	 place
		       sections,  how  to align them in the file, etc. If this
		       bit is set for an ELF descriptor, the  program  assumes
		       responsibility for determining all file positions. This
		       bit is meaningful only for elf_flagelf() and applies to
		       the entire file associated with the descriptor.

       When  a	flag  bit  is  set for an item, it affects all the subitems as
       well. Thus, for example, if the program sets the ELF_F_DIRTY  bit  with
       elf_flagelf(), the entire logical file is ``dirty.''

EXAMPLES
       Example 1 A sample display of calling the elf_flagdata() function.

       The  following  fragment	 shows how one might mark the ELF header to be
       written to the output file:

	 /* dirty ehdr ... */
	 ehdr = elf32_getehdr(elf);
	 elf_flagehdr(elf, ELF_C_SET, ELF_F_DIRTY);

ATTRIBUTES
       See attributes(5) for descriptions of the following attributes:

       ┌─────────────────────────────┬─────────────────────────────┐
       │      ATTRIBUTE TYPE	     │	    ATTRIBUTE VALUE	   │
       ├─────────────────────────────┼─────────────────────────────┤
       │Interface Stability	     │Committed			   │
       ├─────────────────────────────┼─────────────────────────────┤
       │MT-Level		     │MT-Safe			   │
       └─────────────────────────────┴─────────────────────────────┘

SEE ALSO
       elf(3ELF),  elf32_getehdr(3ELF),	 elf_getdata(3ELF),  elf_update(3ELF),
       attributes(5)

SunOS 5.10			  11 Jul 2001		    elf_flagdata(3ELF)
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