zero(3tcl)
NAME
zero - Create and manipulate zero channels
SYNOPSIS
package require Tcl package require memchan zero
DESCRIPTION
The command described here is only available in a not-yet released version of the package. Use the CVS to get the sources.
- zero creates a zero channel which absorbs everything written into it.
- Reading from a zero channel will return the requested number of null bytes. These channels are essentially Tcl-specific variants of the zero device for unixoid operating systems (/dev/zero). Transfering the generated channel between interpreters is possible but does not make much sense.
OPTIONS
Memory channels created by zero provide one additional option to set or
query.
- -delay ?milliseconds?
- A zero channel is always writable and readable. This means that all fileevent-handlers will fire continuously. To avoid starvation of other event sources the events raised by this channel type have a configurable delay. This option is set in milliseconds and defaults to 5.
SEE ALSO
memchan, fifo, fifo2, null, random
KEYWORDS
zero, null, in-memory channel, channel, i/o
COPYRIGHT
- Copyright (c) 2004 Pat Thoyts <patthoyts@users.sourceforge.net>