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-'\"
-'\" Copyright (c) 1999-2000 Ajuba Solutions.
-'\"
-'\" See the file "license.terms" for information on usage and redistribution
-'\" of this file, and for a DISCLAIMER OF ALL WARRANTIES.
-.TH Tcl_StackChannel 3 8.3 Tcl "Tcl Library Procedures"
-.so man.macros
-.BS
-'\" Note:  do not modify the .SH NAME line immediately below!
-.SH NAME
-Tcl_StackChannel, Tcl_UnstackChannel, Tcl_GetStackedChannel, Tcl_GetTopChannel \- manipulate stacked I/O channels
-.SH SYNOPSIS
-.nf
-.nf
-\fB#include <tcl.h>\fR
-.sp
-Tcl_Channel
-\fBTcl_StackChannel\fR(\fIinterp, typePtr, clientData, mask, channel\fR)
-.sp
-int
-\fBTcl_UnstackChannel\fR(\fIinterp, channel\fR)
-.sp
-Tcl_Channel
-\fBTcl_GetStackedChannel\fR(\fIchannel\fR)
-.sp
-Tcl_Channel
-\fBTcl_GetTopChannel\fR(\fIchannel\fR)
-.sp
-.SH ARGUMENTS
-.AS Tcl_ChannelType clientData
-.AP Tcl_Interp *interp in
-Interpreter for error reporting.
-.AP "const Tcl_ChannelType" *typePtr in
-The new channel I/O procedures to use for \fIchannel\fR.
-.AP ClientData clientData in
-Arbitrary one-word value to pass to channel I/O procedures.
-.AP int mask in
-Conditions under which \fIchannel\fR will be used: OR-ed combination of
-\fBTCL_READABLE\fR, \fBTCL_WRITABLE\fR and \fBTCL_EXCEPTION\fR.
-This can be a subset of the operations currently allowed on \fIchannel\fR.
-.AP Tcl_Channel channel in
-An existing Tcl channel such as returned by \fBTcl_CreateChannel\fR.
-.BE
-
-.SH DESCRIPTION
-.PP
-These functions are for use by extensions that add processing layers to Tcl
-I/O channels.  Examples include compression and encryption modules.  These
-functions transparently stack and unstack a new channel on top of an
-existing one.  Any number of channels can be stacked together.
-.PP
-The implementation of the Tcl channel code was rewritten in 8.3.2 to
-correct some problems with the previous implementation with regard to
-stacked channels.  Anyone using stacked channels or creating stacked
-channel drivers should update to the new \fBTCL_CHANNEL_VERSION_2\fR
-\fBTcl_ChannelType\fR structure.  See \fBTcl_CreateChannel\fR for details.
-.PP
-\fBTcl_StackChannel\fR stacks a new \fIchannel\fR on an existing channel
-with the same name that was registered for \fIchannel\fR by
-\fBTcl_RegisterChannel\fR.
-.PP
-\fBTcl_StackChannel\fR works by creating a new channel structure and
-placing itself on top of the channel stack.  EOL translation, encoding and
-buffering options are shared between all channels in the stack.  The hidden
-channel does no buffering, newline translations, or character set encoding.
-Instead, the buffering, newline translations, and encoding functions all
-remain at the top of the channel stack.  A pointer to the new top channel
-structure is returned.  If an error occurs when stacking the channel, NULL
-is returned instead.
-.PP
-The \fImask\fR parameter specifies the operations that are allowed on the
-new channel.  These can be a subset of the operations allowed on the
-original channel.  For example, a read-write channel may become read-only
-after the \fBTcl_StackChannel\fR call.
-.PP
-Closing a channel closes the channels stacked below it.  The close of
-stacked channels is executed in a way that allows buffered data to be
-properly flushed.
-.PP
-\fBTcl_UnstackChannel\fR reverses the process.  The old channel is
-associated with the channel name, and the processing module added by
-\fBTcl_StackChannel\fR is destroyed.  If there is no old channel, then
-\fBTcl_UnstackChannel\fR is equivalent to \fBTcl_Close\fR.  If an error
-occurs unstacking the channel, \fBTCL_ERROR\fR is returned, otherwise
-\fBTCL_OK\fR is returned.
-.PP
-\fBTcl_GetTopChannel\fR returns the top channel in the stack of
-channels the supplied channel is part of.
-.PP
-\fBTcl_GetStackedChannel\fR returns the channel in the stack of
-channels which is just below the supplied channel.
-
-.SH "SEE ALSO"
-Notifier(3), Tcl_CreateChannel(3), Tcl_OpenFileChannel(3), vwait(n).
-
-.SH KEYWORDS
-channel, compression