From owner-freebsd-hackers  Mon Oct 16 16: 9:34 2000
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Date: Tue, 17 Oct 2000 00:09:26 +0100
From: David Malone <dwmalone@maths.tcd.ie>
To: Alfred Perlstein <bright@wintelcom.net>
Cc: hackers@freebsd.org, bde@freebsd.org
Subject: Re: readv manpage != UIO_MAXIOV
Message-ID: <20001017000926.A52976@walton.maths.tcd.ie>
References: <20001016150017.T272@fw.wintelcom.net>
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In-Reply-To: <20001016150017.T272@fw.wintelcom.net>; from bright@wintelcom.net on Mon, Oct 16, 2000 at 03:00:17PM -0700
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On Mon, Oct 16, 2000 at 03:00:17PM -0700, Alfred Perlstein wrote:

> a) change the kernel to match the docco and possibly breaks
>    lotsa stuff?
> b) change the docco to note that although FreeBSD allows 
>    more than 16 iovecs, it's not recommeneded for portability
>    reasons
> c) change readv/writev but provide compat syscalls.

Susv2 man pages say:

     iovcnt is valid if greater than 0 and less than or equal to
     {IOV_MAX}, defined in <limits.h>

We don't seem to #define IOV_MAX, but we could and them update the
man page to refer to it. It says IOV_MAX must be atleast _XOPEN_IOV_MAX
which is 16. 

	David.


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