Re: [Dpcl-user] Welcome to the "Dpcl-develop" mailing list

[Dave W. <dwo...@us...>]

Hi
DPCL does not provide any way to obtain process exit status for processes 
that it attaches to, so would not work for what you propose. DPCL is also 
probably far too 'heavyweight' for using just as a process termination 
monitor since when DPCL attaches to a process, it parses the executable 
looking for symbol table information and builds data structures in memory 
representing the structure of each process that it loads. 

You might be able to accomplish what you want by using ptrace to attach to 
each process, assuming that you have permission to attach to those 
processes (your userid owns the process or your userid is root). Once you 
attach, you need to resume execution, then write code which polls for exit 
status when your process is notified that one of the processes you 
connected to via ptrace has terminated.

Dave



Sasidhar Palaka <psa...@gm...> 
Sent by: dpc...@li...
07/30/2006 10:32 AM

To
dpc...@li...
cc

Subject
Re: [Dpcl-user] Welcome to the "Dpcl-develop" mailing list






Hi all,

Context: I am building a monitoring tool that will monitor a set of 
processes (list of processes from a config file). I am interested in 
knowing the exit status of each of these processes the system 
monitors. Depending on the exit status (and signals, if any, that 
caused the exit), the tool will take further action.

One approach: I am thinking of opening a pipe to "truss" (or its 
variants) for each of processes to be monitored and look for the exit 
status.

Is there a better way to simulate a "silent attachment to a running 
process" to be notified of the exit status?

Could DPCL help in any fashion?

Thanks,
Sasi.


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