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\" Copyright (c) 2010 Kai Wang
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\" Id: dwarf_hasattr.3 3963 2022-03-12 16:07:32Z jkoshy
\"
Dd April 17, 2010
Dt DWARF_HASATTR 3
Os
Sh NAME
Nm dwarf_hasattr
Nd check for the presence of an attribute
Sh LIBRARY
Lb libdwarf
Sh SYNOPSIS
In libdwarf.h
Ft int
Fo dwarf_hasattr
Fa "Dwarf_Die die"
Fa "Dwarf_Half attr"
Fa "Dwarf_Bool *ret_bool"
Fa "Dwarf_Error *err"
Fc
Sh DESCRIPTION
Function
Fn dwarf_hasattr
tests whether the debugging information entry referenced in argument
Fa die
contains the attribute named by argument
Fa attr .
Legal values for argument
Fa attr
are those denoted by the
Dv DW_AT_*
constants in the DWARF specification.
Pp
If the named attribute is present in the debugging information entry,
function
Fn dwarf_hasattr
returns a non-zero value in the location pointed to by argument
Fa ret_bool .
If the named attribute is not present, a zero is written instead.
Pp
If argument
Fa err
is not
Dv NULL ,
it will be used to return an error descriptor in case of an error.
Sh RETURN VALUES
On success, function
Fn dwarf_hasattr
returns
Dv DW_DLV_OK .
In case of an error, it returns
Dv DW_DLV_ERROR
and sets argument
Fa err .
Sh ERRORS
Function
Fn dwarf_hasattr
can fail with the following error:
Bl -tag -width ".Bq Er DW_DLE_ARGUMENT"
It Bq Er DW_DLE_ARGUMENT
Either of argument
Va die
or
Va ret_bool
was
Dv NULL .
El
Sh SEE ALSO
Xr dwarf 3 ,
Xr dwarf_attr 3 ,
Xr dwarf_whatattr 3
