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elf_ndxscn(3) [freebsd man page]

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

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

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