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ELF_GETDATA(3)		 BSD Library Functions Manual		ELF_GETDATA(3)

NAME
     elf_getdata, elf_newdata, elf_rawdata — iterate through or allocate sec‐
     tion data

LIBRARY
     library “libelf”

SYNOPSIS
     #include <libelf.h>

     Elf_Data *
     elf_getdata(Elf_Scn *scn, Elf_Data *data);

     Elf_Data *
     elf_newdata(Elf_Scn *scn);

     Elf_Data *
     elf_rawdata(Elf_Scn *scn, Elf_Data *data);

DESCRIPTION
     These functions are used to access and manipulate data descriptors asso‐
     ciated with section descriptors.  Data descriptors used by the ELF
     library are described in elf(3).

     Function elf_getdata() will return the next data descriptor associated
     with section descriptor scn.  The returned data descriptor will be setup
     to contain translated data.  Argument data may be NULL, in which case the
     function returns the first data descriptor associated with section scn.
     If argument data is not NULL, it must be a pointer to a data descriptor
     associated with section descriptor scn, and function elf_getdata() will
     return a pointer to the next data descriptor for the section, or NULL
     when the end of the section's descriptor list is reached.

     Function elf_newdata() will allocate a new data descriptor and append it
     to the list of data descriptors associated with section descriptor scn.
     The new data descriptor will be initialized as follows:
	   d_align    Set to 1.
	   d_buf      Initialized to NULL.
	   d_off      Set to (off_t) -1.  This field is under application con‐
		      trol if the ELF_F_LAYOUT flag was set on the ELF
		      descriptor.
	   d_size     Set to zero.
	   d_type     Initialized to ELF_T_BYTE.
	   d_version  Set to the current working version of the library, as
		      set by elf_version(3).
     The application must set these values as appropriate before calling
     elf_update(3).  Section scn must be associated with an ELF file opened
     for writing.  If the application has not requested full control of layout
     by setting the ELF_F_LAYOUT flag on descriptor elf, then the data refer‐
     enced by the returned descriptor will be positioned after the existing
     content of the section, honoring the file alignment specified in member
     d_align.  On successful completion of a call to elf_newdata(), the ELF
     library will mark the section scn as “dirty”.

     Function elf_rawdata() is used to step through the data descriptors asso‐
     ciated with section scn.  In contrast to function elf_getdata(), this
     function returns untranslated data.  If argument data is NULL, the first
     data descriptor associated with section scn is returned.  If argument
     data is not NULL, is must be a data descriptor associated with section
     scn, and function elf_rawdata() will return the next data descriptor in
     the list, or NULL if no further descriptors are present.  Function
     elf_rawdata() always returns Elf_Data structures of type ELF_T_BYTE.

   Special handling of SHT_NOBITS sections
     For sections of type SHT_NOBITS, the functions elf_getdata() and
     elf_rawdata() return a pointer to a valid Elf_Data structure that has its
     d_buf member set to NULL and its d_size member set to the size of the
     section.

     If an application wishes to create a section of type SHT_NOBITS, it
     should add a data buffer to the section using function elf_newdata().  It
     should then set the d_buf and d_size members of the returned Elf_Data
     structure to NULL and the desired size of the section respectively.

RETURN VALUES
     These functions return a valid pointer to a data descriptor if success‐
     ful, or NULL if an error occurs.

ERRORS
     These functions may fail with the following errors:

     [ELF_E_ARGUMENT]  Arguments scn was NULL.

     [ELF_E_ARGUMENT]  Data descriptor data was not associated with section
		       descriptor scn.

     [ELF_E_RESOURCE]  An out of memory condition was detected.

SEE ALSO
     elf(3), elf_flagdata(3), elf_flagscn(3), elf_getscn(3), elf_getshdr(3),
     elf_newscn(3), elf_rawfile(3), elf_update(3), elf_version(3), gelf(3)

BSD				April 30, 2010				   BSD
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