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Date:      Thu, 18 Feb 1999 05:20:56 -0800 (PST)
From:      mvh@ix.netcom.com
To:        freebsd-gnats-submit@freebsd.org
Subject:   misc/10148: atime behavior differs with empty files for 2.2.8 and 3.1-current
Message-ID:  <19990218132056.2DFE311310@hub.freebsd.org>

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>Number:         10148
>Category:       misc
>Synopsis:       atime behavior differs with empty files for 2.2.8 and 3.1-current
>Confidential:   no
>Severity:       non-critical
>Priority:       medium
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Thu Feb 18 05:30:01 PST 1999
>Closed-Date:
>Last-Modified:
>Originator:     Mike Harding
>Release:        3.1FreeBSD netcom1.netcom.com 3.1-STABLE FreeBSD 3.1-STABLE #0: Wed Feb 17 04:35:48 PST 13.1-stable
>Organization:
Stamps.com
>Environment:
FreeBSD netcom1.netcom.com 3.1-STABLE FreeBSD 3.1-STABLE #0: Wed Feb 17 04:35:48 PST 1999     mvh@netcom1.netcom.com:/usr/src/sys/compile/MIKE  i386

>Description:
Create an empty file.
read the file (cat it or open with emacs)
atime is not updated for a 3.1 system, it is updated for a 2.2.8 system.
This breaks the leafnode port.
I don't know if this is due to a kernel change or a library change.
I compiled a 3.1 kernel with and without softupdates, and there
was no change, so it's not due to my using softupdates (directly, anyways).


>How-To-Repeat:
(From the leafnode+ mailing list)

atime is updated when a null file is read on 2.2.8. Here's what
happend:

  tom@bergen [~] touch myfile
  tom@bergen [~] cat myfile
  tom@bergen [~] perl -e '$f="myfile"; use File::stat; print
  stat($f)->atime, ", ",stat($f)->mtime, "\n";'
  919102955, 919102953
  tom@bergen [~] cat myfile
  tom@bergen [~] perl -e '$f="myfile"; use File::stat; print
  stat($f)->atime, ", ",stat($f)->mtime, "\n";'
  919102985, 919102953

>Fix:



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


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