From owner-freebsd-hackers  Thu Oct 26 02:51:23 1995
Return-Path: owner-hackers
Received: (from root@localhost)
          by freefall.freebsd.org (8.6.12/8.6.6) id CAA29136
          for hackers-outgoing; Thu, 26 Oct 1995 02:51:23 -0700
Received: from ref.tfs.com (ref.tfs.com [140.145.254.251])
          by freefall.freebsd.org (8.6.12/8.6.6) with ESMTP id CAA29131
          for <freebsd-hackers@freebsd.org>; Thu, 26 Oct 1995 02:51:18 -0700
Received: (from julian@localhost) by ref.tfs.com (8.6.12/8.6.12) id CAA27831; Thu, 26 Oct 1995 02:50:55 -0700
From: Julian Elischer <julian@ref.tfs.com>
Message-Id: <199510260950.CAA27831@ref.tfs.com>
Subject: Re: _SC_PAGESIZE patch to sysconf(3)
To: vcapuano@esoc.esa.de (Vincenzo Capuano)
Date: Thu, 26 Oct 1995 02:50:55 -0700 (PDT)
Cc: freebsd-hackers@freebsd.org
In-Reply-To: <9510260906.AA17142@dpd16.dpd.esoc.esa.de> from "Vincenzo Capuano" at Oct 26, 95 10:06:28 am
X-Mailer: ELM [version 2.4 PL24]
Content-Type: text
Content-Length: 2701      
Sender: owner-hackers@freebsd.org
Precedence: bulk

It's not a bad addition, but it's not in the POSIX  definitions
that I can see, though I only have the XPG4 definitions which
allign this call to posix-1 despite having some posix 2 definitions in it
(the posix 2 standard was still not approved when XPG4 went to print I think)


if this is not POSIX standard it should be hidden behind a
#ifndef _POSIX_SOURCE
> 
> I was porting a program I developed on Solaris to FreeBSD when I got into a
> missing call: sysconf(_SC_PAGESIZE). I know I could use getpagesize(3), but
> I then had to ifdef my code.
> So, if you like it here is a patch to sysconf that will recognise _SC_PAGESIZE.
> 
> Here are the diffs:
> -------------------------------------------------------------------------------
> *** /usr/src/lib/libc/gen/sysconf.c.orig        Wed Oct 25 20:57:03 1995
> --- /usr/src/lib/libc/gen/sysconf.c     Wed Oct 25 21:15:33 1995
> ***************
> *** 179,184 ****
> --- 179,188 ----
>                         return (-1);
>                 return (value);
>                 break;
> +       case _SC_PAGESIZE:
> +               mib[0] = CTL_HW;
> +               mib[1] = HW_PAGESIZE;
> +               break;
>         default:
>                 errno = EINVAL;
>                 return (-1);
> *** /usr/src/lib/libc/gen/sysconf.3.orig        Thu Oct 26 00:13:26 1995
> --- /usr/src/lib/libc/gen/sysconf.3     Thu Oct 26 00:20:38 1995
> ***************
> *** 142,147 ****
> --- 142,150 ----
>   .It Li _SC_2_UPE
>   Return 1 if the system supports the User Portability Utilities Option,
>   otherwise \-1.
> + .It Li _SC_PAGESIZE
> + Number of bytes in a system memory page. Page granularity is the granularity
> + of many of the memory management calls. See also getpagesize(3).
>   .El
>   .Sh RETURN VALUES
>   If the call to
> *** /usr/include/sys/unistd.h.orig      Wed Oct 25 21:00:56 1995
> --- /usr/include/sys/unistd.h   Thu Oct 26 00:27:55 1995
> ***************
> *** 115,120 ****
> --- 115,121 ----
>   #define       _SC_2_UPE               25
>   #define       _SC_STREAM_MAX          26
>   #define       _SC_TZNAME_MAX          27
> + #define       _SC_PAGESIZE            28
>   
>   /* configurable system strings */
>   #define       _CS_PATH                 1
> 
> -------------------------------------------------------------------------------
> 
> They apply to -current.
> 
> 
>   Vincenzo
> ========================================================================
> Vincenzo Capuano, Vitrociset  /\_/\  Tel:            +49 (0)6151 90-3159
> European Space Agency - ESOC ( o.o ) Fax:            +49 (0)6151 90-3414
> Robert Bosch Strasse 5        > - <  Email: vcapuano@vmprofs.esoc.esa.de
> D-64293 Darmstadt, Germany
>