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From: david@ukma.uky.csnet (David Herron, NPR Lover)
Newsgroups: net.unix-wizards
Subject: Re: Microport Unix -- Large Model Problems
Message-ID: <5068@ukme.ukma.uky.csnet>
Date: Fri, 7-Nov-86 12:40:51 EST
Article-I.D.: ukme.5068
Posted: Fri Nov  7 12:40:51 1986
Date-Received: Sat, 8-Nov-86 06:43:12 EST
References: <1376@batcomputer.TN.CORNELL.EDU> <840@ur-valhalla.UUCP>
Reply-To: david@ukme.UUCP (David Herron, NPR Lover)
Organization: U of Kentucky, Mathematical Sciences
Lines: 22

In article <840@ur-valhalla.UUCP> dave@valhalla.UUCP (Dave Carlson) writes:
>A potential problem I smacked into yesterday when porting BSD to SV/AT
>is ioctl(2) expects as the third argument:
>union   { int iarg;
>        char *cparg;}
>Problem is that the union will pull 4 bytes off the stack (in large model)
>but the program calling with an integer will only push 2 bytes.  Oh S*$&!
>I cast my integer args long and everything seems ok but what a pain...

Argh!  And you're doing a port of an operating system???

UNIONS are the SAME size regardless of WHICH part of them you use!

A user which passes an int to a routine expecting a union is ASKING
for trouble!

Argh!
-- 
David Herron,  cbosgd!ukma!david, david@UKMA.BITNET, david@ms.uky.csnet
(I'm also "postmaster", "news", "netnews", "uucp", "mmdf", and ...)
(And also the ACM chapter chairperson.)
(And even an all-around nice guy.  Aren't you lucky to get something from me?)