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On Sat, Apr 07, 2007 at 02:37:57PM -0400, William L. Maltby wrote:
> On Sat, 2007-04-07 at 15:24 -0300, Rodrigo Barbosa wrote:
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> > On Sat, Apr 07, 2007 at 02:08:35PM -0400, William L. Maltby wrote:
> > > On Sat, 2007-04-07 at 14:03 -0400, William L. Maltby wrote:
> > > > On Sat, 2007-04-07 at 14:20 -0300, Rodrigo Barbosa wrote:
> > > > <snip>
> > >
> > > > >
> > > > > <snip>
>
> > > Almost forgot - you might enjoy looking at the "trap" command in bash
> > > (and other shells). Allows entry to arbitrary routines based on
> > > asynchronous events, similar to signal handling in "C". Receiving
> > > function has the choice of resetting the trap, issuing arbitrary actions
> > > and signals, setting other traps, etc. Fun stuff.
> >
> > Yup, used it in the past.
> >
> > Actually, my idea for using (...)& is because of the trap. This way,
> > you can trap SIG_ALARM as you would with sigaction, and use
> > (...)& as you would alarm().
>
> Since the (...)& and {...} are in-line, they have some minor reduced
> usefulness as compared to trap. Because setting the trap, and processing
> the trap when a signal is received, returns to the script position it
> happened to be executing when the signal was received, you don't need to
> have something like and alarm followed directly by the kill. You can set
> the alarm, let the shell do wome other things and the signal will cause
> entry to the "trap code" regardless of what else is going on. And then
> execution can continue at the place the shell/process was interrupted.
The idea is to use (...)& to trigger the trap. Just like alarm().
> BUT, it's use is not nearly as straightforward. And first time users
> will have to work a little harder at understanding how to use it
> effectively (or... at all) because there are no samples in the docs. But
> they know how to Google I think. That'll fill in the missing pieces for
> them.
For sure.
> Well, end of thread? We might have overstayed our welcome on this
> already.
>
> I've enjoyed it.
Humm, maybe. I'll contact you again (off-list, of course) if I decide to
go ahead and code this application. You do have a sourceforge account,
don't you :-D.
[]s
- --
Rodrigo Barbosa
"Quid quid Latine dictum sit, altum viditur"
"Be excellent to each other ..." - Bill & Ted (Wyld Stallyns)
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