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8423Re: File system monitoring (for improved upstreaming)

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  • Emmanuel Décarie
    Aug 4, 2005
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      Hello there,

      I saw this today on the AppleScript Users list and though that it could
      be of interest for the people here. I'm forwarding this also to the
      FrontierKernel list.


      >Date: Fri, 29 Jul 2005 14:55:32 +0200
      >From: Le Stang Jean-Baptiste <lists@...>
      >Subject: Re: [OT] "Message" when file created.
      >Cc: AppleScript Users <applescript-users@...>
      >Message-ID: <848E60AC-8A73-4DBB-88EA-55FFF81AD3E4@...>
      >> I seem to remember that there's a low level system message created
      >> when a file is created. Basically, when a file is created the system
      >> notices and does something which can be hooked into by other apps.
      >> Does this ring any bells with anyone? If so, can you point me in
      >> vaguely the right direction (a starter would be to get the
      >> terminology right!).
      >I'm not sure this is really the best place to talk about that, but you
      >can have a look to 'kqueue(s)', that were introduced in Mac OS X. 3,
      >'kqueue(s)' can detect file creation, file modification, and many
      >other events related to file I/O. (could be a very good companion to
      >folder actions) :
      >Here is a nice sample showing what can be done with 'kqueue(s)' :
      >This sample includes a detailed PDF report explaining kqueue(s).

      >Date: Sun, 31 Jul 2005 19:28:39 -0400
      >From: Chris Garaffa <chris@...>
      >If you're more comfortable with Cocoa, try Uli Kusterer's UKKQueue
      >class: <http://www.zathras.de/programming/sourcecode.htm>. I've used
      >it with success, but have never tried calling it from AppleScript
      >(you'd have to do that via "call method" in a Studio app).

      Also, there is a pointer in this thread to this web page and fslogger.

      A File System Change Logger for "Tiger"

      >FSLogger is a user-space program for Mac OS X 10.4 "Tiger". It
      >subscribes to the same file system event notificatio mechanism as the
      >Spotlight metadata server
      > Note that fslogger doe not use the Spotlight APIs. It uses the
      > mechanism underlying to Spotlight.
      >fslogger's mode of operation is very simple. The following points are
      >particularly noteworthy
      >It must be run as root, for example, via the sudo command. This is so
      >because subscribing to the kernel's file system change notification
      >service requires super-user privileges.
      >It takes no useful arguments. You can, however, pass in arbitrary
      >arguments that will result in an informational message.
      >It does not interfere with the working of Spotlight, since the kernel
      >supports multiple such subscribers.
      >It will not run on any Mac OS X version older than 10.4.
      >Once active, fslogger will wait for change notifications to arrive
      >from the file system layer in the kernel. The variou file system
      >operations that are communicated to fslogger (and other subscribers
      >such as Spotlight, specifically th metadata server) include
      >File creation
      >Folder creation
      >File or folder deletion
      >Changes to the stat structure (for example, a permission change)
      >Renaming of a file or a folder
      >Content modification
      >Content exchange between two files
      >Finder information changes
      >Change of ownership

      Emmanuel Décarie / Programmation pour le Web - Programming for the Web
      <http://scriptdigital.com/> - Blog: <http://blog.scriptdigital.com> -
      AIM: scriptdigital
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