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Message-ID: <374C93CB.54BAD584@cisco.com>
Date: Wed, 26 May 1999 17:37:31 -0700
From: "Ashish C. Nagre" <ashishcn AT cisco DOT com>
Reply-To: ashishcn AT cisco DOT com
Organization: Cisco Systems
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To: "Suhaib M. Siddiqi" <ssiddiqi AT ipass DOT net>
CC: "Ashish C. Nagre" <nagreac AT cs DOT purdue DOT edu>, cygwin AT sourceware DOT cygnus DOT com
Subject: Re: ioctl() question - SLIGHT CHANGE
References: <Pine DOT GSO DOT 4 DOT 05 DOT 9905261914470 DOT 13492-100000 AT lisa DOT cs DOT purdue DOT edu> <374C928B DOT AB301B0D AT ipass DOT net>
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> "Ashish C. Nagre" wrote:
> >
> > Hi,
> > I was trying to port an app from UNIX to NT, one of the things that needs
> > to be done is to get the interface addresses associated with the machine.
> > It does that using the following call:
> >
> >         ioctl(fd, SIOCGIFADDR, (char*)&ifr)
> >         where,
> >         fd - is a socket
> >         ifr - is a struct ifreq.
> > The function returns an error saying Invalid Argument.
> > Actually, SIOCGIFADDR was not defined with cygwin, so I added the
> > following also:
> >
> >         /* Just a definition of a macro which was not with cygnus; */
> > /* so the compiler doesn't complain.                                    */
> > #define IOC_INOUT       (IOC_IN |IOC_OUT)
> > #define _IOWR(x, y, t) \
> >         (IOC_INOUT|((((int)sizeof (t))&IOCPARM_MASK)<<16)|(x<<8)|y)
> > #define SIOCGIFADDR     _IOR('i', 13, struct ifreq)    /* get ifnet
> > address */

That should read as _IOWR instead of _IOR.


> >
> > I would greatly appreciate it if you could help me out since I am stuck on
> > this for a long time and have no clue about how to go about this.
> > Thanks for your time.
> >
> > Ashish
> >
> > **************************************************************************
> > ASHISH C. NAGRE                             Graduate Student
> > Department of Computer Sciences             e-mail: nagreac AT cs DOT purdue DOT edu
> > Purdue University,W. Lafayette              Phone : (765)-494-5007
> > Indiana, 47906. USA                         Office: MA 407
> > url : www.cs.purdue.edu/people/nagreac
> > **************************************************************************
> >                        :PHILOSOPHY OF LIFE:
> > Stability without boredom; passion without recklessness; happiness
> > without naivete. Plan for sunshine but bring an umbrella.  A little
> > paranoia never hurt anyone. Underpromise and overdeliver.
> > ---------------------------------------------------------------------------
> 
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