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-'\"
-'\" Copyright (c) 1996 by Sun Microsystems, Inc.
-'\"
-'\" See the file "license.terms" for information on usage and redistribution
-'\" of this file, and for a DISCLAIMER OF ALL WARRANTIES.
-'\"
-.TH Tcl_GetStdChannel 3 7.5 Tcl "Tcl Library Procedures"
-.so man.macros
-.BS
-'\" Note:  do not modify the .SH NAME line immediately below!
-.SH NAME
-Tcl_GetStdChannel, Tcl_SetStdChannel \- procedures for retrieving and replacing the standard channels
-.SH SYNOPSIS
-.nf
-\fB#include <tcl.h>\fR
-.sp
-Tcl_Channel
-\fBTcl_GetStdChannel\fR(\fItype\fR)
-.sp
-\fBTcl_SetStdChannel\fR(\fIchannel, type\fR)
-.sp
-.SH ARGUMENTS
-.AS Tcl_Channel channel
-.AP int type in
-The identifier for the standard channel to retrieve or modify.  Must be one of
-\fBTCL_STDIN\fR, \fBTCL_STDOUT\fR, or \fBTCL_STDERR\fR.
-.AP Tcl_Channel channel in
-The channel to use as the new value for the specified standard channel.
-.BE
-
-.SH DESCRIPTION
-.PP
-Tcl defines three special channels that are used by various I/O related
-commands if no other channels are specified.  The standard input channel
-has a channel name of \fBstdin\fR and is used by \fBread\fR and \fBgets\fR.
-The standard output channel is named \fBstdout\fR and is used by
-\fBputs\fR.  The standard error channel is named \fBstderr\fR and is used for
-reporting errors.  In addition, the standard channels are inherited by any
-child processes created using \fBexec\fR or \fBopen\fR in the absence of any
-other redirections.
-.PP
-The standard channels are actually aliases for other normal channels.  The
-current channel associated with a standard channel can be retrieved by calling
-\fBTcl_GetStdChannel\fR with one of
-\fBTCL_STDIN\fR, \fBTCL_STDOUT\fR, or \fBTCL_STDERR\fR as the \fItype\fR.  The
-return value will be a valid channel, or NULL.
-.PP
-A new channel can be set for the standard channel specified by \fItype\fR
-by calling \fBTcl_SetStdChannel\fR with a new channel or NULL in the
-\fIchannel\fR argument.  If the specified channel is closed by a later call to
-\fBTcl_Close\fR, then the corresponding standard channel will automatically be
-set to NULL.
-.PP
-If a non-NULL value for \fIchannel\fR is passed to \fBTcl_SetStdChannel\fR,
-then that same value should be passed to \fBTcl_RegisterChannel\fR, like so:
-.PP
-.CS
-Tcl_RegisterChannel(NULL, channel);
-.CE
-.PP
-This is a workaround for a misfeature in \fBTcl_SetStdChannel\fR that it
-fails to do some reference counting housekeeping.  This misfeature cannot
-be corrected without contradicting the assumptions of some existing
-code that calls \fBTcl_SetStdChannel\fR.
-.PP
-If \fBTcl_GetStdChannel\fR is called before \fBTcl_SetStdChannel\fR, Tcl will
-construct a new channel to wrap the appropriate platform-specific standard
-file handle.  If \fBTcl_SetStdChannel\fR is called before
-\fBTcl_GetStdChannel\fR, then the default channel will not be created.
-.PP
-If one of the standard channels is set to NULL, either by calling
-\fBTcl_SetStdChannel\fR with a NULL \fIchannel\fR argument, or by calling
-\fBTcl_Close\fR on the channel, then the next call to \fBTcl_CreateChannel\fR
-will automatically set the standard channel with the newly created channel.  If
-more than one standard channel is NULL, then the standard channels will be
-assigned starting with standard input, followed by standard output, with
-standard error being last.
-.PP
-See \fBTcl_StandardChannels\fR for a general treatise about standard
-channels and the behavior of the Tcl library with regard to them.
-
-.SH "SEE ALSO"
-Tcl_Close(3), Tcl_CreateChannel(3), Tcl_Main(3), tclsh(1)
-
-.SH KEYWORDS
-standard channel, standard input, standard output, standard error