Re: IOV_MAX value

[Randall R Schulz <rrschulz at cris dot com>]

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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