Control Pipe

Hello,

I've just written a patch for GKrellM which adds a "control pipe" which  
may be used to change configuration or control plugins which are aware of  
this feature.  At the beginning it starts a thread which reads lines from  
~/.gkrellm2/ctlpipe (can be with (undocumented) --pipe command line  
option).  When a line is available in the pipe the thread executes  
parse_monitor_config_keyword() so that plugin gets notified about the  
command by it's load_user_config() function.

I'm also attaching a gk-echo plugin which shows basic mechanism of the  
control pipe as well as a patch to GKrellM Background Changer plugin which  
makes it possible to force background change from the command line.  It's  
enough to lunch (patched) GKrellM with a (patched) GKrellM Background  
Changer plugin and then run:

     echo bgchg ctl change-background >~/.gkrellm2/ctlpipe

To see gk-echo in action it's enought to run:

     echo echo whatever >~/.gkrellm2/ctlpipe

Any comments or suggestions? Any chances it'll get to GKrellM's code? I'm  
aware that pipes are not the best solution as there may be some problems  
if two processes try to write data to it.  In that case it may get messy  
but on the other hand it works with a simple 'echo' shell-built in  
command. :)

The only issue I've noticed at the moment is that select() doesn't seem to  
work as expected.  What I mean is that it doesn't return 1 when there's  
data in the pipe as expected but instead waits and returns 0.

-- 
Best regards,                                         _     _
  .o. | Liege of Serenly Enlightened Majesty of      o' \,=./ `o
  ..o | Computer Science,  Michal "mina86" Nazarewicz   (o o)
  ooo +--<mina86*tlen.pl>--<jid:mina86*jabber.org>--ooO--(_)--Ooo--

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