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Date: Mon, 14 Oct 1996 02:11:49 +0200 (MET DST)
From: Tor Egge <tegge@itea.ntnu.no>
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Subject: misc/1791: syslimits.h does not allow overriding default value of ARG_MAX
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>Number:         1791
>Category:       misc
>Synopsis:       syslimits.h does not allow overriding default value of ARG_MAX
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    freebsd-bugs
>State:          open
>Class:          change-request
>Submitter-Id:   current-users
>Arrival-Date:   Sun Oct 13 17:20:01 PDT 1996
>Last-Modified:
>Originator:     Tor Egge
>Organization:
Norwegian University of Science and Technology, Trondheim, Norway

>Release:        FreeBSD 2.2-CURRENT i386
>Environment:

FreeBSD skarven.itea.ntnu.no 2.2-CURRENT FreeBSD 2.2-CURRENT #0: Fri Oct 11 23:58:42  1996     root@skarven.itea.ntnu.no:/usr/src/sys/compile/SKARVEN  i386

>Description:

	It is not possible to specify an alternative value of ARG_MAX
	in the kernel config file, since /usr/src/sys/sys/syslimits.h 
	defines ARG_MAX even if it was defined.

>How-To-Repeat:

	Compile a kernel where one line in the kernel config file says

	options         ARG_MAX=262144

>Fix:

	Only define ARG_MAX if it is not already defined.

Index: syslimits.h
===================================================================
RCS file: /export/ftpsearch3/cvs/src/sys/sys/syslimits.h,v
retrieving revision 1.6
diff -c -r1.6 syslimits.h
*** syslimits.h	1994/12/03 17:36:37	1.6
--- syslimits.h	1996/10/11 21:28:38
***************
*** 37,43 ****
--- 37,45 ----
  #ifndef _SYS_SYSLIMITS_H_
  #define _SYS_SYSLIMITS_H_
  
+ #ifndef ARG_MAX
  #define	ARG_MAX			65536	/* max bytes for an exec function */
+ #endif
  #ifndef CHILD_MAX
  #define	CHILD_MAX		   40	/* max simultaneous processes */
  #endif

>Audit-Trail:
>Unformatted: