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Path: euryale.cc.adfa.oz.au!newshost.anu.edu.au!harbinger.cc.monash.edu.au!nntp.coast.net!news.dacom.co.kr!arclight.uoregon.edu!dispatch.news.demon.net!demon!jraynard.demon.co.uk!not-for-mail From: james@jraynard.demon.co.uk (James Raynard) Newsgroups: comp.unix.bsd.freebsd.misc Subject: Re: _IOR and _IOW Date: 26 Jul 1996 01:01:51 -0000 Organization: A FreeBSD Box Lines: 15 Message-ID: <4t95dv$dhe@jraynard.demon.co.uk> References: <clxyVBW00YUt0tk340@andrew.cmu.edu> NNTP-Posting-Host: localhost X-NNTP-Posting-Host: jraynard.demon.co.uk In article <clxyVBW00YUt0tk340@andrew.cmu.edu>, Mahesh Saptharishi <mahesh+@andrew.cmu.edu> wrote: > >I would like to know what the macros _IOR and _IOW do? They're used to declare the commands used for the "request" argument of ioctl(2). _IOW is used for an 'in' parameter, _IOR for an 'out' parameter and there's an _IOWR macro that combines the two. See <sys/scsiio.h> for an example of their use. -- James Raynard, Edinburgh, Scotland james@jraynard.demon.co.uk http://www.freebsd.org/~jraynard/