[Etoys] Re: File Descriptor release?

[David T. Lewis]

Assuming that you know the process id of the squeak vm, the currently
open file handles are listed in the /proc/<squeakVmPid>/fd directory.

Aside from figuring out what files are currently open, this is also
useful if you ever have a VM that is locked up on a blocking read
operation. You can just echo some data to /proc/<squeakVmPid>/<someFd>,
and the Squeak image will wake up and come back to life.

Dave

On Fri, Oct 13, 2006 at 01:18:28PM -0700, John M McIntosh wrote:
> Being a unix system does it have lsof available?
> 
> If so that will certainly tell you what file handles are open by the  
> squeak vm.
> 
> 
> On 13-Oct-06, at 1:02 PM, Yoshiki Ohshima wrote:
> 
> >  Hello,
> >
> >  Lately I'm moving files back and forth between a Windows PC and an
> >OLPC test board via a USB memory in VFAT.  The OLPC test board runs
> >official OLPC kernel (build 94) that is a modified Linux.  Here I have
> >a problem to unmount the file system after Squeak opens something on
> >the file system.
> >
> >  A typical workflow is:
> >
> >  * There are bare minimum stuff running on the board.  On X, xterm
> >    and twm and that is it.
> >
> >  * mount a USB memory on the board:
> >
> >    mount -t vfat /dev/sdb1 /mnt
> >
> >  * launch Squeak.  The binary of VM and image are on a different
> >    file system than /dev/sdb1.
> >
> >  * open a FileList, and navigate to /mnt.
> >
> >  * close the FileList.  Do 'purge undo records' (just for the heck of
> >    it) and do fullGC couples of times.
> >
> >  * go to xterm while Squeak is running and try:
> >
> >    umount /mnt
> >
> >    I get "device is busy" error.
> >
> >  * close Squeak and try unmount again.  I can unmount the file system
> >    this time.
> >
> >  The VM is 3.9-8 that I compiled from the repository.  Is this
> >something to do with the Linux VFAT driver, or a problem with the
> >Squeak VM?
> >
> >-- Yoshiki
> >
> 
> --
> ======================================================================== 
> ===
> John M. McIntosh <johnmci at smalltalkconsulting.com>
> Corporate Smalltalk Consulting Ltd.  http://www.smalltalkconsulting.com
> ======================================================================== 
> ===
> 
>