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Date: Sun, 13 Mar 2005 15:17:35 -0700 (MST)
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To: sam.wun@authtec.com
From: "M. Warner Losh" <imp@bsdimp.com>
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References: <4234849A.90505@authtec.com>
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cc: freebsd-current@freebsd.org
Subject: Re: _IOWR
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In message: <4234849A.90505@authtec.com>
            sam wun <sam.wun@authtec.com> writes:
: I have a special  hardware would like to integrate with FreeBSD. I most 
: probably need to write a driver for it.
: As I look thru some device driver code, I found this function/macro 
: _IOWR() written in may places of the driver code.
: Where can I find how does this macro/function defined in FreeBSD?

sys/ioccom.h

Warner