How can i call a function which is usually used by root?

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To: "fedora-list" <fedora-list@xxxxxxxxxx>
Subject: How can i call a function which is usually used by root?
From: "wk" <304702903@xxxxxx>
Date: Tue, 2 Dec 2008 17:20:43 +0800
Reply-to: "Community assistance, encouragement, and advice for using Fedora." <fedora-list@xxxxxxxxxx>

I want write a c program.And a common user(not in root group) will run this program.
In this program,I call fread(/dev/sdc...) and fwrite(/dev/sdc),but this call will return "permission no allow".If I use the root user,will be ok.
How to change to the authority to root's?

I know the root's password.

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