gspawn_async_with_pipes questions

[Colossus <colossus 3000 it>]

Hi,

I need gspawn_async_with_pipes to run the unzip command this 
way: unzip -l foo

The output should go in a gtk_tree_view. My questions:
1) May I pass NULL to the last 5 arguments of 
gspawn_async_with_pipes for the purpose of filling
the gtk_tree_view ?
2) Child setup and user data ? What do I have to give
to these arguments ??

Please help,
--
Colossus

Cpsed, a Linux OpenGL 3D scene editor
http://cpsed.sourceforge.net/