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From: Mel Flynn <mel.flynn+fbsd.questions@mailing.thruhere.net>
To: freebsd-questions@freebsd.org
Date: Tue, 14 Apr 2009 21:07:26 +0200
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Cc: Tobias Rehbein <tobias.rehbein@web.de>
Subject: Re: [OT] C programming question: reopen stdin
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On Tuesday 14 April 2009 20:13:00 Tobias Rehbein wrote:

> I'm having a little trouble solving a specific problem in C. I want to
> write a filter which reads data from stdin. After reading the user should
> be able to interact with the program via stdin.

Just open(2) /dev/tty. If tty is invalid, then you don't have to expect a user 
either.
-- 
Mel