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Date:      Thu, 28 Mar 2002 19:56:13 +0100 (CET)
From:      Matthias Buelow <mkb@wi4d22.informatik.uni-wuerzburg.de>
To:        FreeBSD-gnats-submit@FreeBSD.org
Subject:   kern/36425: bump up SYS_NMLN in sys/utsname.h
Message-ID:  <20020328185613.BA3F8AC42@reiher.informatik.uni-wuerzburg.de>
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>Number:         36425
>Category:       kern
>Synopsis:       bump up SYS_NMLN in sys/utsname.h
>Confidential:   no
>Severity:       non-critical
>Priority:       medium
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          change-request
>Submitter-Id:   current-users
>Arrival-Date:   Thu Mar 28 11:00:02 PST 2002
>Closed-Date:
>Last-Modified:
>Originator:     Matthias Buelow
>Release:        FreeBSD 4.5-STABLE i386
>Organization:
>Environment:
System: FreeBSD reiher.informatik.uni-wuerzburg.de 4.5-STABLE FreeBSD 4.5-STABLE #0: Fri Mar 22 18:00:52 CET 2002 root@reiher.informatik.uni-wuerzburg.de:/usr/src/sys/compile/REIHER i386


>Description:

	The current definition of the SYS_NMLN constant, which defines
	the length of the entries of the utsname structure for use with
	uname(3) is defined in 4.5-STABLE sys/utsname.h as following:

	#define SYS_NMLN        32

	This is probably a leftover from early days and was forgotten
	to update when Internet hostnames became fashionable (up to
	256 characters.)  As a result, one cannot reliably obtain the
	hostname via uname(3), other entries like the "version" field
	are also truncated.  This has caused a problem for me lately
	because the nmh mailer suite was using uname(3) for obtaining
	the hostname and got a truncated one, resulting in some effort
	for identifying and working around the problem.


>How-To-Repeat:

>Fix:

	Update SYS_NMLN to at least 256.  On Solaris 8, it is 257 and
	defined as following:

	#define _SYS_NMLN       257     /* 4.0 size of utsname elements */
					/* Must be at least 257 to      */
					/* support Internet hostnames.  */

	On NetBSD (1.5.1) it is:

	#define _SYS_NMLN       256

	It might also be beneficial to not make SYS_NMLN visible in
	certain cases but define it like the above mentioned systems
	with a prepended underscore, and only defining the SYS_NMLN
	constant when certain conditions hold, on NetBSD and Solaris,
	this is:

	#if !defined(_POSIX_C_SOURCE) && !defined(_XOPEN_SOURCE)
	#define SYS_NMLN        _SYS_NMLN
	#endif

	although this is just makeup, imho (don't know what the standard
	has to say here but there seems to be a reason if both do it
	the same way.)

>Release-Note:
>Audit-Trail:
>Unformatted:

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