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From: guy%gorodish@Sun.COM (Guy Harris)
Newsgroups: comp.unix.wizards
Subject: Re: No more signals
Message-ID: <21812@sun.uucp>
Date: Tue, 23-Jun-87 04:31:02 EDT
Article-I.D.: sun.21812
Posted: Tue Jun 23 04:31:02 1987
Date-Received: Thu, 25-Jun-87 01:12:44 EDT
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> Now, does anyone know how the bits are laid out?  I would appreciate it if
> someone would show me setbit, clearbit, and testbit algorithms that are
> not machine- or width-specific.

Under 4.3BSD, and systems that have correctly picked up the 4.3
changes, there are macros to set, clear, and test bits, so you don't
have to know how the bits are laid out.  I presume Ultrix picked them
up.  The manual page should mention FD_SET, FD_CLR, FD_ISSET, and
FD_ZERO; those macros are in <sys/types.h>.
	Guy Harris
	{ihnp4, decvax, seismo, decwrl, ...}!sun!guy
	guy@sun.com