_IOWR

[M. Warner Losh]

In message: <4234849A.90505 at authtec.com>
            sam wun <sam.wun at 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