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2zero(n)                                                                zero(n)
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NAME

7       zero - Create and manipulate zero channels
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SYNOPSIS

10       package require Tcl
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12       package require memchan
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14       zero
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DESCRIPTION

18       The command described here is only available in a not-yet released ver‐
19       sion of the package. Use the CVS to get the sources.
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21       zero   creates a zero channel which absorbs everything written into it.
22              Reading  from a zero channel will return the requested number of
23              null bytes. These channels are essentially Tcl-specific variants
24              of  the  zero  device for unixoid operating systems (/dev/zero).
25              Transfering the generated channel between interpreters is possi‐
26              ble but does not make much sense.
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OPTIONS

29       Memory channels created by zero provide one additional option to set or
30       query.
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32       -delay ?milliseconds?
33              A zero channel is always writable and readable. This means  that
34              all fileevent-handlers will fire continuously.  To avoid starva‐
35              tion of other event sources the events raised  by  this  channel
36              type  have a configurable delay. This option is set in millisec‐
37              onds and defaults to 5.
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SEE ALSO

40       memchan, fifo, fifo2, null, random
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KEYWORDS

43       zero, null, in-memory channel, channel, i/o
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46       Copyright (c) 2004 Pat Thoyts <patthoyts@users.sourceforge.net>
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50Memory channels                       2.2                              zero(n)
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