[CLUG] I'm locked!

[Jerry Walsh]

"hey, Mr. Bob, I really                                          
want to use that file you have locked.  Please freeup that file and report                                          
accordingly to User/Parent process that you had a request for that file, but                                        
dont try to bomb out..." => killall -9 building bob_himself his_digger bricks etc. etc.

;)

I'm bored.

Jerry.


somebody called Baldwin_James at emc.com wrote:
> Cheers Paul for the info..
> 
> To explain, (with return comments) see below :)
> 
> >>>>> "BJ" == Baldwin James <Baldwin_James at emc.com> writes:
> 
>     BJ> How do ya find out the PID's & UID's (and/or maybe parent
>     BJ> PID's of Child processes) which are locking a file?
> 
> lsof can tell which processes have a file open.  I think it will also
> indicate if the file is locked.  Given the PID gleaned from lsof, you
> can then use ps to get any other needed information.
> 
>     BJ> How could you unlock the file from them without killing their
>     BJ> process?
> 
> Paul asked: > Why would you want to do that?  If you did do that, the
> calling
> Paul asked: > process with the lock wouldn't know about it, so it would
> carry on
> Paul asked: > doing whatever it is doing to the locked region.
> 
> If a process is hung which has a log file locked for exclusive access, and
> you wanna examine that log file without destroying the PID and then return
> the lock back to the PID.  I am basically trying to be as non-intrusive as
> possible (this instance would be on a remote system).
> 
>     BJ> How could you inform the user or push a std. file-handling
>     BJ> command to instruct the process to release the file?
> 
> Paul asked: > I'm not sure what you mean by this, to be honest.
> 
> Lets say, you are able to identify that Bob the Builder, (e.g. UID#505) has
> Frags.log open and you want to use (Read/Write)that file.  You need to
> inform Bob to release/close that file so you can get it.  How can you inform
> Bob about this?  
> 
> If Bob the builder is a process rather than a user, then is it possible for
> some type of Unix/Linux directive to basically say "hey, Mr. Bob, I really
> want to use that file you have locked.  Please freeup that file and report
> accordingly to User/Parent process that you had a request for that file, but
> dont try to bomb out..."
> (I would think the above request would be app-dependent unless coders follow
> some type of practice like this????)
> 
> 
> Cheers Paul,
> James.
> 
> 
> 
> -- 
> "Pity has no place at my table."
>       -- Dr Hannibal Lecter
> 
> _______________________________________________
> Cork maillist  -  Cork at linux.ie
> http://www.linux.ie/mailman/listinfo/cork
> 
> _______________________________________________
> Cork maillist  -  Cork at linux.ie
> http://www.linux.ie/mailman/listinfo/cork

-- 
Jerry Walsh                            jerry at nitroweb.ie
NitroWeb Computing Ltd.                Fax +353 21 4776209
Crossmahon, Bandon,                    Tel  +353 21 4775540
Cork Ireland.                          http://www.nitroweb.ie/ 

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