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
