From: Aredridel <aredridel@...>
Date: 2004-03-30T04:02:34+09:00
Subject: Ruby/DL and output char* parameter

I'm trying to wrap the xattr system calls with Ruby/DL (mostly to learn
Ruby/DL, but I do need to be able to read xattrs eventually)

My code looks like so:

require 'dl'
require 'dl/import'
 
module Xattr
  extend DL::Importable
  dlload "libattr.so"
  extern "int attr_get(const char*, const char *, char *, int *, int)"
end
 
i=[1000]
Xattr.attr_get('.', 'user.description', s, i, 0)
puts s

The problem is, "s" isn't set to the result, which is returned as the
third parameter. Is there a way to get what was returned in this case?

Ari