System calls from Mozilla Gecko environment

Madhavan Malolan <[email protected]> Sun, 9 Dec 2012 01:33:52 -0800 (PST)
Newsgroups gmane.comp.mozilla.devel.embedding
Message-ID <[email protected]>
Hi i am new to Gecko and i am developing a small application.
I wanted to know if it is possible to have system calls from the Gecko Environment.
If yes, how?
Also could you please give me a good pointer to documentation of File I/O in Gecko.

Regards,
Madhavan