# tcl::chan::nullzero(3tcl) 1.1 virtchannel_base "Reflected/virtual channel support"

## Name

tcl::chan::nullzero - Null/Zero channel combination

## Synopsis

- package require Tcl 8.5 9
- package require TclOO
- package require tcl::chan::events ?1.1?
- package require tcl::chan::nullzero ?1.1?

- ::tcl::chan::nullzero

## Description

The tcl::chan::nullzero package provides a command creating channels, which are a combination of null and zero devices. They immediately forget whatever is written to them, and on reading return an infinite stream of null characters.

Packages related to this are tcl::chan::null and tcl::chan::zero.

The internal TclOO class implementing the channel handler is a sub-class of the tcl::chan::events framework.

## API

::tcl::chan::nullzero

  This command creates a new nullzero channel and returns its handle.

## Bugs, Ideas, Feedback

This document, and the package it describes, will undoubtedly contain bugs and other problems. Please report such in the category virtchannel of the Tcllib Trackers. Please also report any ideas for enhancements you may have for either package and/or documentation.

When proposing code changes, please provide unified diffs, i.e the output of diff -u.

Note further that attachments are strongly preferred over inlined patches. Attachments can be made by going to the Edit form of the ticket immediately after its creation, and then using the left-most button in the secondary navigation bar.

## Keywords

/dev/null, /dev/zero, null, reflected channel, tip 219, virtual channel, zero

## Category

Channels

## Copyright

Copyright © 2009 Andreas Kupries <andreas_kupries@users.sourceforge.net>