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From: gwyn@brl-smoke.ARPA (Doug Gwyn )
Newsgroups: comp.unix.wizards
Subject: Re: No more signals
Message-ID: <6006@brl-smoke.ARPA>
Date: Mon, 22-Jun-87 08:33:52 EDT
Article-I.D.: brl-smok.6006
Posted: Mon Jun 22 08:33:52 1987
Date-Received: Tue, 23-Jun-87 04:02:15 EDT
References: <48300005@hcx1> <1207@ius2.cs.cmu.edu>
Reply-To: gwyn@brl.arpa (Doug Gwyn (VLD/VMB) <gwyn>)
Organization: Ballistic Research Lab (BRL), APG, MD.
Lines: 13

In article <1207@ius2.cs.cmu.edu> edw@ius2.cs.cmu.edu (Eddie Wyatt) writes:
-  Another Unix function that I see having problems is "select".  If you
-decide to muck around with the kernal and increase the max number of 
-file descriptions to more than the number of bits in an integer then
-your going to have problems using select to do multiplexing since
-it uses an int as a bit mask for the files examined.

No, it originally did that, but the current (4.3BSD) select() operates
with "fd sets", which in general are several words (enough for one bit
for each fd).

I seem to recall that the trend of the POSIX signals subcommittee was
toward a similar mechanism for signal masks.