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Date: Tue, 5 Oct 2010 15:34:10 +0900
From: Daichi GOTO <daichi@ongs.co.jp>
To: Garrett Cooper <gcooper@FreeBSD.org>
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Cc: freebsd-fs@freebsd.org, freebsd-current@freebsd.org
Subject: Re: fcntl always fails to delete lock file, and PID is always -6464
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Thanks nice test tool :)  And at last I got it excepting one mystery!

On Mon, 4 Oct 2010 20:17:08 -0700
Garrett Cooper <gcooper@FreeBSD.org> wrote:
> Following through the same process on FreeBSD...
> 
> Window 1:
> $ ls -l /tmp/lockfile
> ls: /tmp/lockfile: No such file or directory
> $ ./test_fcntl
> 
> Window 2:
> 
> $ ls -l /tmp/lockfile
> -rwsr-x---  1 garrcoop  wheel  0 Oct  4 20:14 /tmp/lockfile
> $ ./test_fcntl
> test_fcntl: fcntl: Resource temporarily unavailable

Just my mystery is as follow:

Windows 1:
% ./test_fcntl 
My pid: 43490

Windows 2:
% ls -l /tmp/lockfile 
-r-sr-x---  1 daichi  wheel  0 10月  5 15:02 /tmp/lockfile    <--- is it weird, isn't it?
% ./test_fcntl 
test_fcntl: open: Permission denied
% 

Oops... What's wrong... /tmp is as follow:

% mount | grep tmp
/dev/ada0s1f on /tmp (ufs, local, noatime, soft-updates)
% dumpfs /tmp | grep journal   
flags	soft-updates+journal 
% 

And working scene: 

Windows 2:
% chmod u+w /tmp/lockfile
% ls -l /tmp/lockfile
-rwsr-x---  1 daichi  wheel  0 10月  5 15:22 /tmp/lockfile
% ./test_fcntl 
My pid: 43646
test_fcntl: fcntl[1]: Resource temporarily unavailable
PID=43490 has the lock
% 

-- 
Daichi GOTO
CEO | ONGS Inc.
81-42-316-7945 | daichi@ongs.co.jp | http://www.ongs.co.jp
LinkedIn: http://linkedin.com/in/daichigoto