From owner-freebsd-emulation  Wed Dec 12  6: 0:18 2001
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From: Andrew Gallatin <gallatin@cs.duke.edu>
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Date: Wed, 12 Dec 2001 08:59:39 -0500 (EST)
To: Willem van Engen <wvengen@stack.nl>
Cc: freebsd-emulation@freebsd.org
Subject: Re: flexlm: works with linux_base-6, fails with linux_base-7
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Willem van Engen writes:
 > > I don't see anything obvious either.  Are you sure that the 
 > > bsd_flock contains the same thing in the linux_base-6 case?
 > Acutally no, there is a difference. I got lost in printf %[l][l]x stuff.
 > 
 > linux_base-7:
 >   linux(2810): fcntl64(4, 00000006, *)
 >   > fcntl_bsd(4, F_SETLK, flock)
 >   > bsd.l_start = 0, lin.l_start = 0
 >   > bsd.l_len = bfbff15000000000, lin.l_len = bfbff15000000000
 >   > bsd.l_pid= 280cbc80, lin.l_pid = 280cbc80
 >   > bsd.l_type= 3, lin.l_type = 1
 >   > bsd.l_whence= 1, lin.l_whence = 1
 > linux_base-6:
 >   linux(2801): fcntl(4, 00000006, *)
 >   > fcntl_bsd(4, F_SETLK, flock)
 >   > bsd.l_start = 0, lin.l_start = 0
 >   > bsd.l_len = 0, lin.l_len = 0
 >   > bsd.l_pid= 0, lin.l_pid = 0
 >   > bsd.l_type= 3, lin.l_type = 1
 >   > bsd.l_whence= 1, lin.l_whence = 1

I think that linux ignores at least the pid field & replaces it with
the pid of the current process.  I haven't looked at the guts of their
flock to see if they ignore len as well.  I think if you zero those 2
fields in linux_to_bsd_flock64, you'll be fine.  

Hopefully, Marcel will have some idea of what the "right" thing to do
here is.

Drew

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