How to decide the stardard input is a pipe

From: Binary Chen (binary.chen_at_gmail.com)
Date: 06/20/05 

Date: 20 Jun 2005 01:11:40 -0700

Hi,

I want to know which api should I use to determin whether the stardard
input is pipe, like './a |./b'?

TIA.

Binary Chen

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