nullzero man page

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


package require Tcl 8.5

package require TclOO

package require tcl::chan::events ?1?

package require tcl::chan::nullzero ?1?



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.


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.


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




tcllib Reflected/virtual channel support