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From: davids@iscuva.UUCP (David Schmidt)
Newsgroups: comp.unix.wizards
Subject: Handling multiple asynchronous reads under Ultrix
Message-ID: <517@iscuva.UUCP>
Date: Tue, 12-May-87 20:57:21 EDT
Article-I.D.: iscuva.517
Posted: Tue May 12 20:57:21 1987
Date-Received: Sat, 16-May-87 03:22:18 EDT
Organization: ISC Systems Corporation, Spokane, Wa.
Lines: 22
Keywords: 4.2BSD Ultrix 1.2

Under Ultrix 1.2 (BSD 4.2), what is the best way to set up
multiple, concurrent read requests?  I would like to set up
a routine that can respond to either a keyboard character or
a network character without having to poll both reads (which
would burn up a LOT of cpu time).

I would also like to avoid using multiple processes (like old
versions of CU did).  I know this can be done as both TIP and
CU under Ultrix only use one process.

I've read the man entries for fcntl(2) and sigvec(2) but I am
unsure of how to set up the reads.  If it makes any difference
one of the reads will be on a socket.

Any code samples would be greatly appreciated!

	Thank-you,
-- 
David Schmidt              UUCP:  davids@iscuva.ISCS.COM
ISC Systems Corporation           (tektronix!reed!iscuva!davids)
East 22425 Appleway        Phone: (509)927-5479
Liberty Lake, WA  99019