When using Gtk2 I normally use the AnyEvent wrapper over that, especially for its AnyEvent::Handle's methods which let you define reading by line as you wish. But keeping with plain Gtk2 you can just, with your $fh set non-blocking, call sysread with the maximum expected length of your data, like this:
use IO::Handle;
my $fh = *STDIN;
$fh->blocking(0);
while (1) { # this block would go in your callback, not in a loop lik
+e this:
$fh->sysread( my $data, 255 );
print "$data"; # split $data into lines on CR|LF put the first lin
+e on the end of the last line of the previous block (use an array per
+haps)
}
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