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From: daveb@rtech.ARPA (Dave Brower)
Newsgroups: net.unix-wizards
Subject: Which *nix ? BSD : System V
Message-ID: <147@rtech.ARPA>
Date: Wed, 13-Feb-85 22:16:03 EST
Article-I.D.: rtech.147
Posted: Wed Feb 13 22:16:03 1985
Date-Received: Mon, 18-Feb-85 05:33:01 EST
Distribution: net
Organization: Relational Technology, Berkeley CA
Lines: 22

[munch]
   If you need to know at compile time whether you're on a Berklix or 
a System V system, this might help.  It seems to work on all of our
systems, including the Pyramid split universe wonder:

	# include	<fcntl.h>
	# ifdef		FNDELAY
	# define	BSD
	# else
	# define	SYS5
	# endif

This assumes that FNDELAY is not defined in the System V fcntl.h, and
is in the BSD.  Can anyone think of a case where this is not true, or
suggest a more convenient/valid alternative?

-dB
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