.\" Copyright (c) 2010 Joseph Koshy
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.\" $Id: dwarf_formsig8.3 3640 2018-10-14 14:09:13Z jkoshy $
.\"
.Dd July 24, 2010
.Dt DWARF_FORMSIG8 3
.Os
.Sh NAME
.Nm dwarf_formsig8
.Nd return the 64-bit type signature for a DWARF type
.Sh LIBRARY
.Lb libdwarf
.Sh SYNOPSIS
.In libdwarf.h
.Ft int
.Fo dwarf_formsig8
.Fa "Dwarf_Attribute attr"
.Fa "Dwarf_Sig8 *ret"
.Fa "Dwarf_Error *err"
.Fc
.Sh DESCRIPTION
Function
.Fn dwarf_formsig8
sets the location pointed to by argument
.Ar ret
to the 64-bit type signature that is the value of
the attribute referenced by argument
.Ar attr .
The form of argument
.Ar attr
must be
.Dv DW_FORM_ref_sig8 .
.Pp
If argument
.Ar err
is not NULL, it will be used to return an error descriptor in case
of an error.
.Sh RETURN VALUES
Function
.Fn dwarf_formsig8
returns
.Dv DW_DLV_OK
on success.
In case of an error, it returns
.Dv DW_DLV_ERROR
and sets argument
.Ar err .
.Sh ERRORS
Function
.Fn dwarf_formsig8
may fail with the following errors:
.Bl -tag -width ".Bq Er DW_DLE_ATTR_FORM_BAD"
.It Bq Er DW_DLE_ARGUMENT
Either of arguments
.Ar attr
or
.Ar ret
was NULL.
.It Bq Er DW_DLE_ATTR_FORM_BAD
The attribute referenced by argument
.Ar attr
was not of a permitted kind.
.El
.Sh SEE ALSO
.Xr dwarf 3 ,
.Xr dwarf_attr 3 ,
.Xr dwarf_formflag 3 ,
.Xr dwarf_formref 3 ,
.Xr dwarf_formsdata 3 ,
.Xr dwarf_formstring 3 ,
.Xr dwarf_formudata 3 ,
.Xr dwarf_hasattr 3
.Sh HISTORY
Type signatures were added in version 4 of the DWARF specification.