[Newbies] Re: Canceling a PipeableOSProcess

[David T. Lewis]

On Fri, Nov 04, 2011 at 05:30:30PM -0700, Sean P. DeNigris wrote:
> 
> David T. Lewis wrote:
> > 
> > You can kill the external process with a unix signal like this:
> >   p processProxy terminate.
> > 
> Cool, thanks.
> 
> 
> David T. Lewis wrote:
> > 
> > However, in general, it is better to permit the external process to exit
> > normally.
> > 
> Better how? On the Unix side, or the Squeak side?
> 
> 
> David T. Lewis wrote:
> > 
> > Note that it is
> > entirely possible to send the exact equivalent of ctrl-c (which is a
> > unix SIGINT signal sent to the process)
> > 
> I'll have to take a look. I was asking because I am calling Mac OS X's
> hdiutil, which can take ~5-10 minutes to run, and sometimes I want to cancel
> the op. I mentioned Ctrl-c specifically because I know it responds to it; on
> the CLI, it gives a message about canceling before stopping.

In that case, try doing something more like this:

  p := PipeableOSProcess command: '/bin/sh'.
  p processProxy sigint.

But use hdiutil rather than the /bin/sh that I use in the above example.
The #sigint message will send a unix SIGINT signal to the external
process, which should be exactly equivalent to doing ctrl-c if you
were running hdiutil from a terminal window on the Mac (but I do
not actually have a Mac, so I might be getting the details wrong).

Dave