From: Tim Hunter <sastph@...>
Date: 2005-04-05T04:29:44+09:00
Subject: Re: Extension question

Joe Van Dyk wrote:
> How should errors be handled in C extensions?  For example, my C
> extension was expecting a Ruby string, but it was passed an IO object.

Generally the Ruby functions that convert Ruby types to C types will 
raise an exception if they're given invalid input.
> 
> Or, what should I do when I try to open a file in C (the filename
> being passed to the function) and the file doesn't exist?
> 

Call rb_raise()

Check out chapter 21 in the new Pickaxe.