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tcl::chan::std(3tcl) Reflected/virtual channel support tcl::chan::std(3tcl)


tcl::chan::std - Standard I/O, unification of stdin and stdout


package require Tcl 8.5

package require TclOO

package require tcl::chan::core ?1?

package require tcl::chan::std ?1?



The tcl::chan::std package provides a command creating a standard channel which unifies stdin and stdout into a single read- and writable channel. The result is not seek-able, like the original standard channels.

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


This command creates the std channel and returns its handle.

The channel is created only once, on the first call, and all future calls simply return this handle.


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.


reflected channel, standard io, stdin, stdout, tip 219, virtual channel




Copyright (c) 2011 Andreas Kupries <>
1 tcllib