---
name: "nullzero"
section: "3tcl"
platform: "linux"
package: "tcllib"
version: "2.0+dfsg-4"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/nullzero"
---

# nullzero(3tcl)

Null/Zero channel combination

```

```

## 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* \[http://core.tcl.tk/tcllib/reportlist\]. 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 (c) 2009 Andreas Kupries <andreas_kupries@users.sourceforge.net>
```