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\" Id: gelf_getrel.3 3958 2022-03-12 14:31:32Z jkoshy
\"
Dd April 22, 2019
Dt GELF_GETREL 3
Os
Sh NAME
Nm gelf_getrel ,
Nm gelf_update_rel
Nd read and update ELF relocation entries
Sh LIBRARY
Lb libelf
Sh SYNOPSIS
In gelf.h
Ft "GElf_Rel *"
Fn gelf_getrel "Elf_Data *data" "int ndx" "GElf_Rel *rel"
Ft int
Fn gelf_update_rel "Elf_Data *data" "int ndx" "GElf_Rel *rel"
Sh DESCRIPTION
These convenience functions are used to retrieve and update class-dependent
Vt Elf32_Rel
or
Vt Elf64_Rel
structures in an ELF object.
Pp
Argument
Fa data
is an
Vt Elf_Data
descriptor associated with a section of type
Dv SHT_REL .
Argument
Fa ndx
is the index of the entry being retrieved or updated.
The class-independent
Vt GElf_Rel
structure is described in
Xr gelf 3 .
Pp
Function
Fn gelf_getrel
retrieves the class-dependent entry at index
Fa ndx
in data buffer
Fa data
and copies it to the destination pointed to by argument
Fa rel
after translation to class-independent form.
Pp
Function
Fn gelf_update_rel
converts the class-independent entry pointed to
by argument
Fa rel
to class-dependent form, and writes it to the entry at index
Fa ndx
in the data buffer described by argument
Fa data .
Function
Fn gelf_update_rel
signals an error if any of the values in the class-independent
representation exceeds the representable limits of the target
type.
Sh RETURN VALUES
Function
Fn gelf_getrel
returns the value of argument
Fa rel
if successful, or
Dv NULL
in case of an error.
Function
Fn gelf_update_rel
returns a non-zero value if successful, or zero in case of an error.
Sh ERRORS
These functions may fail with the following errors:
Bl -tag -width "[ELF_E_RESOURCE]"
It Bq Er ELF_E_ARGUMENT
Arguments
Fa data
or
Fa rel
were
Dv NULL .
It Bq Er ELF_E_ARGUMENT
Argument
Fa ndx
was less than zero or larger than the number of entries in the data
descriptor.
It Bq Er ELF_E_ARGUMENT
Data descriptor
Fa data
was not associated with a section of type
Dv SHT_REL .
It Bq Er ELF_E_RANGE
A value was not representable in the target type.
It Bq Er ELF_E_VERSION
The
Vt Elf_Data
descriptor denoted by argument
Fa data
is associated with an ELF object with an unsupported version.
El
Sh SEE ALSO
Xr elf 3 ,
Xr elf_getdata 3 ,
Xr elf_getscn 3 ,
Xr gelf 3

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