ELF_GETSCN(3)						   BSD Library Functions Manual 					     ELF_GETSCN(3)

NAME

     elf_getscn, elf_ndxscn, elf_newscn, elf_nextscn -- get/allocate section information for an ELF object

LIBRARY

     ELF Access Library (libelf, -lelf)

SYNOPSIS

     #include <libelf.h>

     Elf_Scn *
     elf_getscn(Elf *elf, size_t index);

     size_t
     elf_ndxscn(Elf_Scn *scn);

     Elf_Scn *
     elf_newscn(Elf *elf);

     Elf_Scn *
     elf_nextscn(Elf *elf, Elf_Scn *scn);

DESCRIPTION

     These functions are used to iterate through the sections associated with an ELF descriptor.

     Function elf_getscn() will return a section descriptor for the section at index index in the object denoted by ELF descriptor elf.  An error
     will be signalled if the specified section does not exist.

     Function elf_ndxscn() returns the section table index associated with section descriptor scn.

     Function elf_newscn() creates a new section and appends it to the list of sections associated with descriptor elf.  The library will automat-
     ically increment the e_shnum field of the ELF header associated with descriptor elf, and will set the ELF_F_DIRTY flag on the returned sec-
     tion descriptor.  For ELF descriptors opened for writing, the ELF library will automatically create an empty section at index zero
     (SHN_UNDEF) on the first call to elf_newscn().

     Function elf_nextscn() takes a section descriptor scn and returns a pointer to the section descriptor at the next higher index.  Argument scn
     is allowed to be NULL, in which case this function will return a pointer to the section descriptor at index 1.  If no further sections are
     present, function elf_nextscn() will return a NULL pointer.

RETURN VALUES

     Functions elf_getscn(), elf_newscn() and elf_nextscn() return a valid pointer to a section descriptor if successful, or NULL if an error
     occurs.

     Function elf_ndxscn() returns a valid section table index if successful, or SHN_UNDEF if an error occurs.

ERRORS

     These functions may fail with the following errors:

     [ELF_E_ARGUMENT]  Arguments elf or scn were NULL.

     [ELF_E_ARGUMENT]  Argument index exceeded the current number of sections in the ELF object.

     [ELF_E_ARGUMENT]  Argument elf was not a descriptor for an ELF file.

     [ELF_E_ARGUMENT]  Section descriptor scn was not associated with ELF descriptor elf.

     [ELF_E_CLASS]     Descriptor elf was of an unknown ELF class.

     [ELF_E_SECTION]   Argument elf specified extended section numbering in the ELF header with the section header at index SHN_UNDEF not being of
		       type SHT_NULL.

SEE ALSO

     elf(3), elf_flagdata(3), elf_flagscn(3), elf_getdata(3), elf_getshdr(3), gelf(3)

BSD
								 October 22, 2007							       BSD