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lib/chat2.pl  view on Meta::CPAN

## &chat::close([$handle,])
## $handle is from previous &chat::open().
## like close $handle

sub close { ## public
	if ($_[0] =~ /$nextpat/) {
	 	*S = shift;
	}
	close(S);
	if (defined $S{"needs_close"}) { # is it a listen socket?
		local(*NS) = $S{"needs_close"};
		delete $S{"needs_close"};
		close(NS);
	}
}

## @ready_handles = &chat::select($timeout, @handles)
## select()'s the handles with a timeout value of $timeout seconds.
## Returns an array of handles that are ready for I/O.
## Both user handles and chat handles are supported (but beware of
## stdio's buffering for user handles).

sub select { ## public
	local($timeout) = shift;
	local(@handles) = @_;
	local(%handlename) = ();
	local(%ready) = ();
	local($caller) = caller;
	local($rmask) = "";
	for (@handles) {
		if (/$nextpat/o) { # one of ours... see if ready
			local(*SYM) = $_;
			if (length($SYM)) {
				$timeout = 0; # we have a winner
				$ready{$_}++;
			}
			$handlename{fileno($_)} = $_;
		} else {
			$handlename{fileno(/(?:::|')/ ? $_ : "$caller\::$_")} =
				$_;
		}
	}
	for (sort keys %handlename) {
		vec($rmask, $_, 1) = 1;
	}
	select($rmask, undef, undef, $timeout);
	for (sort keys %handlename) {
		$ready{$handlename{$_}}++ if vec($rmask,$_,1);
	}
	sort keys %ready;
}

# ($pty,$tty) = $chat::_getpty(PTY,TTY):
# internal procedure to get the next available pty.
# opens pty on handle PTY, and matching tty on handle TTY.
# returns undef if can't find a pty.
# Modify "/dev/pty" to "/dev/pts" for Dell Unix v2.2 (aka SVR4.04). Joe Doupnik.

sub _getpty { ## private
	local($_PTY,$_TTY) = @_;
	$_PTY =~ s/^([^':]+)$/(caller)[$[]."::".$1/e;
	$_TTY =~ s/^([^':]+)$/(caller)[$[]."::".$1/e;
	local($pty, $tty, $kind);
	if( -e "/dev/pts000" ){		## mods by Joe Doupnik Dec 1992
		$kind = "pts";		## SVR4 Streams
	} else {
		$kind = "pty";		## BSD Clist stuff
	}
	for $bank (112..127) {
		next unless -e sprintf("/dev/$kind%c0", $bank);
		for $unit (48..57) {
			$pty = sprintf("/dev/$kind%c%c", $bank, $unit);
			open($_PTY,"+>$pty") || next;
			select((select($_PTY), $| = 1)[0]);
			($tty = $pty) =~ s/pty/tty/;
			open($_TTY,"+>$tty") || next;
			select((select($_TTY), $| = 1)[0]);
			system "stty nl>$tty";
			return ($pty,$tty);
		}
	}
	undef;
}

1;