Path: utzoo!mnetor!uunet!lll-winken!lll-tis!ames!nrl-cmf!cmcl2!brl-adm!adm!rbj@icst-cmr.arpa
From: rbj@icst-cmr.arpa (Root Boy Jim)
Newsgroups: comp.unix.wizards
Subject: Shared Memory in BSD4.3 is lacking?
Message-ID: <12136@brl-adm.ARPA>
Date: 4 Mar 88 22:14:59 GMT
Sender: news@brl-adm.ARPA
Lines: 21


   Another feature of the choice to make semaphores/FIFOs/shared memory
   segments different from file descriptors is that select(3) presumably
   won't work with them.  How does one check the condition "is data ready
   on my queue or on my UDP port?"

Which brings a question to my mind. Are there any restrictions on the
things the selected fd's are attached to? I tend to think of using
select on tty's or sockets (pipes), but do they work on regular files
as well?  What if the file pointer is at EOF? And then what if someone
appends to the file? What about tape drives?

   Thanks,
   -- 
   John Riedl
   {ucbvax,decvax,hplabs}!purdue!riedl  -or-  riedl@mordred.cs.purdue.edu

	(Root Boy) Jim Cottrell	<rbj@icst-cmr.arpa>
	National Bureau of Standards
	Flamer's Hotline: (301) 975-5688
I'm mentally OVERDRAWN!  What's that SIGNPOST up ahead?
 Where's ROD STERLING when you really need him?