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NetBSD 6.1.5 - man page for elf_ndxscn (netbsd section 3)

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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
     library ``libelf''

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 associ-
     ated with descriptor elf.	The library will automatically increment the e_shnum field of the
     ELF header associated with descriptor elf, and will set the ELF_F_DIRTY flag on the returned
     section descriptor.  For ELF descriptors opened for writing, the ELF library will automati-
     cally 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
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