IO(3) perl/Tk Documentation IO(3)NAMETk::IO - high level interface to Tk's 'fileevent'
mechanism
SYNOPSIS
my $fh = Tk::IO->new(-linecommand => callback, -childcommand => callback);
$fh->exec("command")
$fh->wait
$fh->kill
WARNING
INTERFACES TO THIS MODULE MAY CHANGE AS PERL'S IO EVOLVES
AND WITH PORT OF TK4.1
DESCRIPTIONTk::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 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->wait can be used to wait for child process while
processing other Tk events.
$fh->kill can be used to send signal to child process.
BUGS
Still not finished. Idea is to use "exec" to emulate
"system" in a non-blocking manner.
25/Aug/1997 Tk400.202 1
