Does gtk have classes to read/write conf file?

[Edward Yang <neo_in_matrix fastmail fm>]

I am very new to gtk programming and, linux programming. I want to know 
if there are classes in gtk that can read/write conf files?

On Windows platform, there is a type of file called INI file 
(initialization file) that is very similar with conf file; INI file has 
sections. I want to know if there are also classes/APIs to manipulate 
INI-like file. Thanks.