Subj : CVS commit src/sbbs3/nope
To   : Deuce
From : Digital Man
Date : Sun Dec 26 2004 02:58 am

  Re: CVS commit src/sbbs3/nope
  By: Deuce to Digital Man on Sun Dec 26 2004 01:26 am

 >  > Hmm... sure you can. If one thread has file open DENYNONE, I sure hope th
 >  > another thread or process running on the same system will be denied open
 >  > access.
 >  >
 >  >  > As for being different than Linux, FreeBSD doesn't use the SMBFS that 
 >  >  > uses.
 >  >
 >  > Oh. It's interesting that it exhibits some of the same flaws. Did they st
 >  > from the same source at some point?
 > 
 > re: 1:  Nope.  advisory locking only, *nix has no DENY* stuff at all... all
 > file/record locking prevents is anyone else from getting a lock... not from
 > opening, reading, writing, etc.  The only way to get a lock-related error fr
 > open() is if you use some non-standard extensions ie: In FreeBSD, you can us
 > the O_SHLOCK and O_EXLOCK flags... which get a lock during the open().

Right. But I'm talking about sopen(), not open(). Our sopen() implementation
attempts a file lock and it's this lock that returning the error with errno=
EDEADLK.

 > re: 2: I don't believe so, I think it was something BSD/OS donated... but th
 > problems in resolving quirks would probobly drive people to the same "fixes"
 > and it's not impossible that the BSD people have glanced at how Linux did it
 > 
 > The biggest problem with locking between Win32 and *nix is that neither OS i
 > capable of everything the other OS can do.  Windows is missing support for t
 > braindead *nix record locking semantics, and *nix has no portable concept of
 > mandatory locking.  There are other differences too... basically, neither OS
 > concept of locking of any kind is supported completely on the other.

Well SMB/CIFS has standardized, cross-platform, file and record locking, which
should (obviously) be supported by all smb/cifs clients and servers (e.g.
smbfs), regardless of the OS on which they're hosted.

                                                  digital man

Snapple "Real Fact" #109:
Smelling apples and/or bananas can help you loose weight.

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