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Date: Tue, 29 May 2001 21:21:09 -0400
From: "John W. De Boskey" <jwd@bsdwins.com>
To: Garrett Wollman <wollman@khavrinen.lcs.mit.edu>
Cc: Current List <freebsd-current@FreeBSD.ORG>
Subject: Re: Correctness of UIO_MAXIOV definition?
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References: <20010526205509.A14824@FreeBSD.org> <200105291701.NAA96866@khavrinen.lcs.mit.edu>
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In-Reply-To: <200105291701.NAA96866@khavrinen.lcs.mit.edu>; from wollman@khavrinen.lcs.mit.edu on Tue, May 29, 2001 at 01:01:24PM -0400
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----- Garrett Wollman's Original Message -----
> <<On Sat, 26 May 2001 20:55:09 -0700, John <jwd@FreeBSD.ORG> said:
> 
> >    The second question I have is more standards based.
> > Should we consider changing UIO_MAXIOV to IOV_MAX or
> > _XOPEN_IOV_MAX and deprecating the 1st? I am unclear
> > on what the standard is for this.
> 
> UIO_MAXIOV is what the kernel is willing to do.  IOV_MAX being
> standardized is what should be used by user code.
> 
> -GAWollman

Hi,

   That seems reasonable, but I can only find UIO_MAXIOV referenced
in 5 files and defined in 1. Thus, I was thinking about simply
updating those references, but still leaving UIO_MAXIOV defined,
though depricated. 

   If the above is simply not the direction we want to go, then
I beleive that UIO_MAXIOV should atleast be defined in terms
of IOV_MAX in sys/uio.h:

#include <limits.h>     # bring in IOV_MAX
#ifdef _KERNEL
#define UIO_MAXIOV IOV_MAX
#endif


   Question: does anyone know the appropriate #define to use
             for IEEE Std. 1003.1-200x,  or should _SC_IOV_MAX
             simply be put behind the non-expansion controlled
              comment (in /usr/src/lib/libc/gen/sysconf.c) 

             switch (name) {
             /* 1003.1 */


   Comments?

Thanks,
-John

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