Tk::IO - high level interface to Tk's 'fileevent' mechanism
=for category Binding Events and Callbacks
my $fh = Tk::IO->new(-linecommand => callback, -childcommand => callback);
INTERFACES TO THIS MODULE MAY CHANGE AS PERL'S IO EVOLVES
Tk::IO is now layered on perl's IO::Handle class. Interfaces
have changed, and are still evolving.
In theory C methods which enable non-blocking IO as in earlier Tk-b*
release(s) are still there. I have not changed them to use perl's
additional Configure information, or tested them much.
Assumption is that B<exec> is
used to fork a child process and a callback is called each time a
complete line arrives up the implied pipe.
"line" should probably be defined in terms of perl's input record
separator but is not yet.
The -childcommand callback is called when end-of-file occurs.
$fh->B<wait> can be used to wait for child process while processing
$fh->B<kill> can be used to send signal to child process.
Idea is to use "exec" to emulate "system" in a non-blocking manner.