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Message-ID: <40F511B2.3050701@x-ray.at>
Date: Wed, 14 Jul 2004 12:57:54 +0200
From: Reini Urban <rurban AT x-ray DOT at>
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To: cygwin AT cygwin DOT com
Subject: Re: cat /proc/registry/HKEY_PERFOMANCE_DATA/@ hangs
References: <40F3ED68 DOT 6030304 AT x-ray DOT at> <Pine DOT GSO DOT 4 DOT 58 DOT 0407131021000 DOT 29800 AT slinky DOT cs DOT nyu DOT edu>
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Igor Pechtchanski schrieb:

> On Tue, 13 Jul 2004, Reini Urban wrote:
> 
> 
>>cat /proc/registry/HKEY_PERFOMANCE_DATA/@
>>hangs forever.
> 
> 
> According to MSDN
> (<http://msdn.microsoft.com/library/en-us/perfmon/base/the_hkey_performance_data_key.asp>):
> 
> 	...although you use the registry to collect performance data, the
> 	data is not stored in the registry database.  Instead, calling the
> 	registry functions with the HKEY_PERFORMANCE_DATA key causes the
> 	system to collect the data from the appropriate system object
> 	managers.
> 
> 	To obtain performance data from the local system, use the
> 	RegQueryValueEx function, with the HKEY_PERFORMANCE_DATA key.
> 	The first call opens the key; you do not need to explicitly open
> 	the key first.  However, be sure to use the RegCloseKey function
> 	to close the handle to the key when you are finished obtaining
> 	performance data.
> 
> This tells me that reading from HKEY_PERFORMANCE_DATA never returns EOF,
> so that you have to terminate it explicitly from the outside.  So your
> behavior sounds absolutely normal.
> 
> 
>>Win2K (no win98 OS)
>>Shouldn't HKEY_PERFOMANCE_DATA be disabled on NT systems, or does it work?
> 
> 
> If the key is present, it'll be in /proc/registry.  FWIW, the MSDN web
> page above doesn't mention any restrictions on the systems that this key
> is present on.
> 
> 
>>This cat has pid 560:
>>$ cat /proc/560/status
>>[snip]
>>
>>kill 560
>>doesn't help, /bin/kill.exe neither.
>>pskill works ok.
> 
> 
> "/bin/kill -f 560".

$ cat /proc/registry/HKEY_PERFOMANCE_DATA/@

/bin/kill -f doesn't work.  (W2K SP4, all updates)

$ ps
       PID    PPID    PGID     WINPID  TTY  UID    STIME COMMAND
      1432       1    1432       1432    0 1000 11:47:24 /usr/bin/bash
       636    1432     636       1724    0 1000 11:47:37 /usr/bin/cat
      1732       1    1732       1732    1 1000 11:49:10 /usr/bin/bash
      1772    1732    1772       1784    1 1000 11:49:14 /usr/bin/ps

$ /bin/kill -f 636
couldn't open pid 636

If the registry handler should follow the stream semantics it should 
react on signals at least.
But neither Ctrl-D nor Ctrl-C work.

next attempt: (still no killall script? then it would be simply killall cat)

$ /bin/kill -9 -f 1748
couldn't open pid 1748

but here cat and the parent bash windows are killed.
-- 
Reini Urban
http://xarch.tu-graz.ac.at/home/rurban/


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