Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!uunet!auspex!guy
From: guy@auspex.auspex.com (Guy Harris)
Newsgroups: comp.unix.internals
Subject: Re: How to distinguish between STREAMS and non-STREAMS
Keywords: STREAMS tty character-special
Message-ID: <5348@auspex.auspex.com>
Date: 17 Jan 91 21:30:51 GMT
References: <josef.663420838@ugum01> <dcm.663952404@baldur>
Organization: Auspex Systems, Santa Clara
Lines: 8

>I_LIST might be particularly fast since if you pass it a NULL pointer
>for the list, it just returns the number of modules on the stream,

Unless, of course, you're not running System V Release 4, in which case
it just returns an error....

I_LOOK also looks only at the stream head, although it does loop through
the table of modules to find the name.