Date: Mon, 24 Nov 1997 13:40:25 +0200 (IST)
From: Eli Zaretskii <eliz AT is DOT elta DOT co DOT il>
To: DJ Delorie <dj AT delorie DOT com>
cc: djgpp-workers AT delorie DOT com
Subject: Re: c1args.c patches
In-Reply-To: <199709162339.TAA28162@delorie.com>
Message-ID: <Pine.SUN.3.91.971124133939.23713Z-100000@is>
MIME-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
Precedence: bulk


On Tue, 16 Sep 1997, DJ Delorie wrote:

> According the POSIX, the correct thing to do is to NOT define ARG_MAX
> at all in limits.h, if its value is indeterminate.  In those cases,
> applications may use #ifdef to detect if they should use ARG_MAX
> (which, if defined, must be constant) or call sysconf().
> 
> It is not correct for limits.h to define ARG_MAX in terms of
> sysconf().

Here's what I propose:

*** include/limits.h~0	Fri Nov 21 18:59:48 1997
--- include/limits.h	Fri Nov 21 19:04:48 1997
***************
*** 27,41 ****
  
  #ifndef __STRICT_ANSI__
  
! #define _POSIX_ARG_MAX		4096	/* but only for exec's to other djgpp programs */
! #define _POSIX_CHILD_MAX	6	/* really limited by memory */
  #define _POSIX_LINK_MAX		1	/* POSIX says 8, but DOS says 1 */
  #define _POSIX_MAX_CANON	126	/* POSIX says 255, but DOS says 126 */
  #define _POSIX_MAX_INPUT	126	/* POSIX says 255, but DOS says 126 */
  #define _POSIX_NAME_MAX		12	/* 8.3 */
  #define _POSIX_NGROUPS_MAX	0
  #define _POSIX_OPEN_MAX		20	/* can be bigger in DOS, but defaults to 20 */
! #define _POSIX_PATH_MAX		255	/* 80 for canonical paths */
  #define _POSIX_PIPE_BUF		512	/* but there aren't any pipes */
  #define _POSIX_SSIZE_MAX	2147483647
  #define _POSIX_STREAM_MAX	20	/* can be bigger in DOS */
--- 27,41 ----
  
  #ifndef __STRICT_ANSI__
  
! #define _POSIX_ARG_MAX		16384	/* but only for exec's to other djgpp programs */
! #define _POSIX_CHILD_MAX	7	/* limited by memory; 7 for 386MAX */
  #define _POSIX_LINK_MAX		1	/* POSIX says 8, but DOS says 1 */
  #define _POSIX_MAX_CANON	126	/* POSIX says 255, but DOS says 126 */
  #define _POSIX_MAX_INPUT	126	/* POSIX says 255, but DOS says 126 */
  #define _POSIX_NAME_MAX		12	/* 8.3 */
  #define _POSIX_NGROUPS_MAX	0
  #define _POSIX_OPEN_MAX		20	/* can be bigger in DOS, but defaults to 20 */
! #define _POSIX_PATH_MAX		256	/* 80 for canonical paths */
  #define _POSIX_PIPE_BUF		512	/* but there aren't any pipes */
  #define _POSIX_SSIZE_MAX	2147483647
  #define _POSIX_STREAM_MAX	20	/* can be bigger in DOS */
***************
*** 43,49 ****
  
  #define NGROUPS_MAX		0
  
! #define ARG_MAX			4096
  #define CHILD_MAX		6
  /* #define OPEN_MAX		20 - DOS can change this */
  /* #define STREAM_MAX		20 - DOS can change this */
--- 43,49 ----
  
  #define NGROUPS_MAX		0
  
! /* #define ARG_MAX			4096 /* depends on LFN; use sysconf */
  #define CHILD_MAX		6
  /* #define OPEN_MAX		20 - DOS can change this */
  /* #define STREAM_MAX		20 - DOS can change this */