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\" Id: dwarf_attr.3 3961 2022-03-12 15:13:22Z jkoshy
\"
Dd April 8, 2010
Dt DWARF_ATTR 3
Os
Sh NAME
Nm dwarf_attr
Nd retrieve an attribute descriptor associated with a DWARF debugging information entry
Sh LIBRARY
Lb libdwarf
Sh SYNOPSIS
In libdwarf.h
Ft int
Fo dwarf_attr
Fa "Dwarf_Die die"
Fa "Dwarf_Half attr"
Fa "Dwarf_Attribute *atp"
Fa "Dwarf_Error *err"
Fc
Sh DESCRIPTION
Function
Fn dwarf_attr
retrieves the attribute descriptor for an attribute associated
with the DWARF debugging information entry descriptor in
argument
Fa die .
Pp
DWARF attribute descriptors are represented by value of the opaque
type
Vt Dwarf_Attribute ,
see
Xr dwarf 3 .
Pp
Argument
Fa attr
names the desired DWARF attribute.
Legal values for argument
Fa attr
are those denoted by the
Dv DW_AT_*
constants in the DWARF specification.
Pp
Argument
Fa atp
points to a location into which the returned attribute descriptor
will be written.
The returned descriptor may then be passed to the form query functions in the
Xr dwarf 3
API set to access the data associated with the attribute.
Pp
If argument
Fa err
is
No non- Ns Dv NULL ,
it will be used to return an error descriptor in case of an error.
Sh RETURN VALUES
Function
Fn dwarf_attr
returns
Dv DW_DLV_OK
on success.
Pp
If the debugging information entry descriptor denoted by argument
Fa die
does not contain the named attribute, the function returns
Dv DW_DLV_NO_ENTRY
and sets argument
Fa err .
For other errors, it returns
Dv DW_DLV_ERROR
and sets argument
Fa err .
Sh ERRORS
Function
Fn dwarf_attr
can fail with the following errors:
Bl -tag -width ".Bq Er DW_DLE_ARGUMENT"
It Bq Er DW_DLE_ARGUMENT
Either of arguments
Fa die
or
Fa atp
was
Dv NULL .
It Bq Er DW_DLE_NO_ENTRY
Argument
Fa die
had no attribute corresponding to the value
in argument
Fa attr .
El
Sh SEE ALSO
Xr dwarf 3 ,
Xr dwarf_attrlist 3 ,
Xr dwarf_attroffset 3 ,
Xr dwarf_hasattr 3 ,
Xr dwarf_hasform 3 ,
Xr dwarf_whatattr 3 ,
Xr dwarf_whatform 3

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