Why isastream() alway returns 0?

From: Steven Woody <narkewoody@xxxxxxxxx>
Date: Tue, 29 Apr 2008 20:29:08 -0700 (PDT)

Hi,

It seems that calling isastream( fd ) on many /dev/xxx such /dev/tty0
always return 0, means not a stream. What's wrong with it?

Thanks.

-
woody
.

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