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From: rmtodd@servalan.uucp (Richard Todd)
Newsgroups: comp.unix.aux
Subject: Re: ioctl problem in A/UX 2.0
Keywords: AUX, 2.0, ioctl, help
Message-ID: <1991Mar9.023839.6801@servalan.uucp>
Date: 9 Mar 91 02:38:39 GMT
References: <2041@public.BTR.COM>
Distribution: usa
Organization: Ministry of Silly Walks
Lines: 27

pke@public.BTR.COM (Peter Espen  pke@btr.com) writes:
>Can someone explain to me why the first ioctl call in the following test
>program fails with an invalid argument error? 

Afraid not.  It gets past that ioctl with no problems for me.  

>I am running A/UX 2.0.

So am I.  I don't know offhand why that ioctl should fail, unless somehow
the char. special file "/dev/tty0" has gotten its major/minor numbers munged.
(They're 0,0 on my system; I think they should be the same on all A/UX systems,
though I'm not sure on this).  

While I'm here, however, I might as well point out one thing I noticed about
your program, namely that it did segfault later on when I ran it,
right at the fputs() :

>	if ((fp = open( name, O_RDWR | O_NDELAY)) == NULL) {
>...
>	if (fputs(buf, fp) == NULL)

open returns a file descriptor, and fputs, expecting a FILE pointer, gets 
rather out of sorts at being passed a file descriptor instead.  
--
Richard Todd	rmtodd@uokmax.ecn.uoknor.edu  rmtodd@chinet.chi.il.us
	rmtodd@servalan.uucp
"Try looking in the Yellow Pages under 'Psychotics'." -- Michael Santana