gelf_update_rel(3) - NetBSD Manual Pages

GELF_GETREL(3)          NetBSD Library Functions Manual         GELF_GETREL(3)


NAME

     gelf_getrel, gelf_update_rel -- read and update ELF relocation entries


LIBRARY

     ELF Object Manipulation Library (libelf, -lelf)


SYNOPSIS

     #include <gelf.h>

     GElf_Rel *
     gelf_getrel(Elf_Data *data, int ndx, GElf_Rel *rel);

     int
     gelf_update_rel(Elf_Data *data, int ndx, GElf_Rel *rel);


DESCRIPTION

     These convenience functions are used to retrieve and update class-depen-
     dent Elf32_Rel or Elf64_Rel structures in an ELF object.

     Argument data is an Elf_Data descriptor associated with a section of type
     SHT_REL.  Argument ndx is the index of the entry being retrieved or
     updated.  The class-independent GElf_Rel structure is described in
     gelf(3).

     Function gelf_getrel() retrieves the class-dependent entry at index ndx
     in data buffer data and copies it to the destination pointed to by argu-
     ment rel after translation to class-independent form.

     Function gelf_update_rel() converts the class-independent entry pointed
     to by argument rel to class-dependent form, and writes it to the entry at
     index ndx in the data buffer described by argument data.  Function
     gelf_update_rel() signals an error if any of the values in the class-
     independent representation exceeds the representable limits of the target
     type.


RETURN VALUES

     Function gelf_getrel() returns the value of argument rel if successful,
     or NULL in case of an error.  Function gelf_update_rel() returns a non-
     zero value if successful, or zero in case of an error.


ERRORS

     These functions may fail with the following errors:

     [ELF_E_ARGUMENT]  Arguments data or rel were NULL.

     [ELF_E_ARGUMENT]  Argument ndx was less than zero or larger than the num-
                       ber of entries in the data descriptor.

     [ELF_E_ARGUMENT]  Data descriptor data was not associated with a section
                       of type SHT_REL.

     [ELF_E_RANGE]     A value was not representable in the target type.

     [ELF_E_VERSION]   The Elf_Data descriptor denoted by argument data is
                       associated with an ELF object with an unsupported ver-
                       sion.


SEE ALSO

     elf(3), elf_getdata(3), elf_getscn(3), gelf(3)

NetBSD 10.99                    April 22, 2019                    NetBSD 10.99