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Message-Id: <5.2.0.9.2.20021203120117.00fe6008@pop3.cris.com>
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Date: Tue, 03 Dec 2002 12:10:40 -0800
To: cygwin AT cygwin DOT com
From: Randall R Schulz <rrschulz AT cris DOT com>
Subject: Re: IOV_MAX value
In-Reply-To: <3DED080A.2090006@earthlink.net>
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Christophe,

I think that definition of IOV_MAX is telling you that there is no 
pre-defined limit. Ordinarily we don't complain about such things, but if 
you write code that statically allocates a resource based on such a limit 
indication, you're in trouble.

I notice that there are two definitions of IOV_MAX. One is in 
/usr/include/limits.h and the other is in /usr/include/sys/limits.h. The 
latter gives 1024, the former has the (__INT_MAX__ - 1) value you mention. 
The file in /usr/include/sys/ identifies itself as originating in Berkeley 
Unix (FreeBSD), while the one in /usr/include identifies itself as a Cygwin 
component.


Others have worked on building ACE under Cygwin, so you might want to check 
the email archives.

Randall Schulz
Mountain VIew, CA USA



At 11:37 2002-12-03, Christophe Galerne wrote:
>Hi,
>
>I am trying to compile the ACE framework on cygwin.
>
>One of the problem I have is that they are using arrays
>of size IOV_MAX on the stack.
>
>Since IOV_MAX is defined in limits.h as
>#define IOV_MAX (__INT_MAX__-1)
>that turns out to be problematic....
>
>Looking on some other platforms I see that IOV_MAX is typically
>define to be [16, 1024]. So I just want to make sure that IOV_MAX
>is correctly defined.
>
>Thanks,
>Christophe


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