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comp.lang.ruby

Win32 Process Signals

Christian Kerth

4/15/2008 9:21:00 AM

Hey!

I user win32/Process to spawn a child Process in my Application

myProc = Process.create(:app_name => "ruby test.rb")

and kill it with

Process.kill(1, myProc.process_id)

How can i trap the signal in the Child Process to do cleanup stuff?

thx
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3 Answers

Avdi Grimm

4/15/2008 12:55:00 PM

0

$ ri Signal.trap
----------------------------------------------------------- Signal::trap
Signal.trap( signal, proc ) => obj
Signal.trap( signal ) {| | block } => obj
------------------------------------------------------------------------
Specifies the handling of signals. The first parameter is a signal
name (a string such as ``SIGALRM'', ``SIGUSR1'', and so on) or a
signal number. The characters ``SIG'' may be omitted from the
signal name. The command or block specifies code to be run when the
signal is raised. If the command is the string ``IGNORE'' or
``SIG_IGN'', the signal will be ignored. If the command is
``DEFAULT'' or ``SIG_DFL'', the operating system's default handler
will be invoked. If the command is ``EXIT'', the script will be
terminated by the signal. Otherwise, the given command or block
will be run. The special signal name ``EXIT'' or signal number zero
will be invoked just prior to program termination. trap returns the
previous handler for the given signal.

Signal.trap(0, proc { puts "Terminating: #{$$}" })
Signal.trap("CLD") { puts "Child died" }
fork && Process.wait

produces:

Terminating: 27461
Child died
Terminating: 27460


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Christian Kerth

4/15/2008 1:00:00 PM

0

Avdi Grimm wrote:

>
> Signal.trap(0, proc { puts "Terminating: #{$$}" })
> Signal.trap("CLD") { puts "Child died" }
> fork && Process.wait
>
> produces:
>
> Terminating: 27461
> Child died
> Terminating: 27460


Yeah, i know. But this obviously doesn't work with win32.

My traps don't catch anything *gg*

ck
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Charles Calvert

4/19/2008 2:45:00 AM

0

On Tue, 15 Apr 2008 07:59:42 -0500, Christian Kerth wrote:

> Avdi Grimm wrote:
>>
>> Signal.trap(0, proc { puts "Terminating: #{$$}" })
>> Signal.trap("CLD") { puts "Child died" }
>> fork && Process.wait

[snip]

> Yeah, i know. But this obviously doesn't work with win32.
>
> My traps don't catch anything *gg*

If you can't find a more portable solution, look at Win32 events, starting
with the CreateEvent function.

--
Charles Calvert | Software Design/Development
Celtic Wolf, Inc. | Project Management
http://www.celti... | Technical Writing
(703) 580-0210 | Research