From: Laurent Julliard <Laurent.Julliard@...>
Date: 2001-07-28T00:32:24+09:00
Subject: [ruby-talk:18638] Accessing argc,argv,environ from a ruby extension?

I'm puzzled by this one.  I'm writing a Ruby extension in C and I need
to access the C global variables argc, argv and environ from the
intialization function of my Ruby extension.

Problem is eventhough I declared these 3 variables as extern in my C
file it looks like Ruby doesn't export these variables. Looking at the
ruby symbol table ruby uses origargc, origargv and origenviron which are
probably what I'm looking for but unfortunately they are static variable
declared not visible from the outside ("b" data type on the nm -o
output).

Am I missing something here or is this specific to Ruby 1.6.4 on Linux ?

To work around the problem, I ended up rebuilding my own argc, argv from
the $* Ruby variable. However I couldn't rebuild environ from the ENV
Standard Ruby object because I have not found a way to access the ENV
object from a C extension (rb_gv_get doesn't work). Any idea ?

Thanks for your help

Laurent