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Message-ID:	<374C9B43.36DAF3BE@vinschen.de>
Date:	Thu, 27 May 1999 03:09:23 +0200
From:	Corinna Vinschen <corinna AT vinschen DOT de>
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To:	ashishcn AT cisco DOT com
CC:	cygwin AT sourceware DOT cygnus DOT com
Subject:	Re: Question about socket calls
References:	<374C73C0 DOT F8840BE6 AT cisco DOT com>

"Ashish C. Nagre" wrote:
> 
> Hello,
> I am a new user of cygnus and am trying to port a UNIX application to NT
> 4.0
> My problem is as follows:
> [...]
>          if (ioctl(fd, SIOCGIFADDR, (char *)&ifr) < 0) {
> [...]
> It returns errno = 22 which means Invalid argument.
> SIOCGIFADDR has been defined by me as follows:
> 
> #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     _IOWR('i', 13, struct ifreq)    /* get ifnet
> address */

If you create a new define for the request parameter of the ioctl call,
how should the underlying system know, what you want?

Or, in other words, the absence of this define in the asm/socket.h
file has the meaning, that this request is not available. Full stop.
Your define will not change this.

You are using the official b20.1 version, isn't it? In the meantime,
this request (and the requests SIOCGIFBRDADDR and SIOCGIFNETMASK)
are implemented in cygwin. Try the official 15-Jan-1999 snapshot in

ftp://sourceware.cygnus.com/pub/cygwin/snapshot-19990115/

named
	cygwin1-19990115.dll.gz  	(the dll itself)
	winsup-src-19990115.tar.gz	(contains sources and especially
					 the header files)

or try my patched version of the 23-Dec-1998 snapshot in
ftp://ftp.franken.de/pub/win32/develop/gnuwin32/cygwin/porters/Vinschen_Corinna/B20

named
	cv_cygwin1.dll.README
	cv_cygwin1.dll.tar.gz		(dll and headers)

Regards,
Corinna

-- 
new mail address:
mailto:corinna AT vinschen DOT de



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