[OpenSPARC-T2-DV] / tools / src / nas,5.n2.os.2 / lib / python / man / man3 / Tcl_SetStdChannel.3

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'\" RCS: @(#) $Id: GetStdChan.3,v 1.4 2001/12/10 15:50:46 dgp Exp $
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'\" The definitions below are for supplemental macros used in Tcl/Tk
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See the \\fBoptions\\fR manual entry for details on the standard options.
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.TH Tcl_GetStdChannel 3 7.5 Tcl "Tcl Library Procedures"
.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 in
.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 \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 behaviour of the Tcl library with regard to them.
.PP

.SH "SEE ALSO"
Tcl_Close(3), Tcl_CreateChannel(3), Tcl_Main(3), tclsh(1)

.SH KEYWORDS
standard channel, standard input, standard output, standard error
Commit	Line	Data
86530b38 AT	1	'\"
	2	'\" Copyright (c) 1996 by Sun Microsystems, Inc.
	3	'\"
	4	'\" See the file "license.terms" for information on usage and redistribution
	5	'\" of this file, and for a DISCLAIMER OF ALL WARRANTIES.
	6	'\"
	7	'\" RCS: @(#) $Id: GetStdChan.3,v 1.4 2001/12/10 15:50:46 dgp Exp $
	8	'\"
	9	'\" The definitions below are for supplemental macros used in Tcl/Tk
	10	'\" manual entries.
	11	'\"
	12	'\" .AP type name in/out ?indent?
	13	'\" Start paragraph describing an argument to a library procedure.
	14	'\" type is type of argument (int, etc.), in/out is either "in", "out",
	15	'\" or "in/out" to describe whether procedure reads or modifies arg,
	16	'\" and indent is equivalent to second arg of .IP (shouldn't ever be
	17	'\" needed; use .AS below instead)
	18	'\"
	19	'\" .AS ?type? ?name?
	20	'\" Give maximum sizes of arguments for setting tab stops. Type and
	21	'\" name are examples of largest possible arguments that will be passed
	22	'\" to .AP later. If args are omitted, default tab stops are used.
	23	'\"
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	25	'\" Start box enclosure. From here until next .BE, everything will be
	26	'\" enclosed in one large box.
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	55	'\" options follow on successive lines, in four columns separated
	56	'\" by tabs.
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	59	'\" End of list of standard options for a Tk widget.
	60	'\"
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	62	'\" Start of description of a specific option. cmdName gives the
	63	'\" option's name as specified in the class command, dbName gives
	64	'\" the option's name in the option database, and dbClass gives
65	'\" the option's class in the option database.
66	'\"
67	'\" .UL arg1 arg2
68	'\" Print arg1 underlined, then print arg2 normally.
69	'\"
70	'\" RCS: @(#) $Id: man.macros,v 1.4 2000/08/25 06:18:32 ericm Exp $
71	'\"
72	'\" # Set up traps and other miscellaneous stuff for Tcl/Tk man pages.
73	.if t .wh -1.3i ^B
74	.nr ^l \n(.l
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78	.ie !"\\$4"" .TP \\$4
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207	.SH "STANDARD OPTIONS"
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218	See the \\fBoptions\\fR manual entry for details on the standard options.
219	..
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244	..
245	.TH Tcl_GetStdChannel 3 7.5 Tcl "Tcl Library Procedures"
246	.BS
247	'\" Note: do not modify the .SH NAME line immediately below!
248	.SH NAME
249	Tcl_GetStdChannel, Tcl_SetStdChannel \- procedures for retrieving and replacing the standard channels
250	.SH SYNOPSIS
251	.nf
252	\fB#include <tcl.h>\fR
253	.sp
254	Tcl_Channel
255	\fBTcl_GetStdChannel\fR(\fItype\fR)
256	.sp
257	\fBTcl_SetStdChannel\fR(\fIchannel, type\fR)
258	.sp
259	.SH ARGUMENTS
260	.AS Tcl_Channel channel in
261	.AP int type in
262	The identifier for the standard channel to retrieve or modify. Must be one of
263	\fBTCL_STDIN\fR, \fBTCL_STDOUT\fR, or \fBTCL_STDERR\fR.
264	.AP Tcl_Channel channel in
265	The channel to use as the new value for the specified standard channel.
266	.BE
267
268	.SH DESCRIPTION
269	.PP
270	Tcl defines three special channels that are used by various I/O related
271	commands if no other channels are specified. The standard input channel
272	has a channel name of \fBstdin\fR and is used by \fBread\fR and \fBgets\fR.
273	The standard output channel is named \fBstdout\fR and is used by
274	\fBputs\fR. The standard error channel is named \fBstderr\fR and is used for
275	reporting errors. In addition, the standard channels are inherited by any
276	child processes created using \fBexec\fR or \fBopen\fR in the absence of any
277	other redirections.
278	.PP
279	The standard channels are actually aliases for other normal channels. The
280	current channel associated with a standard channel can be retrieved by calling
281	\fBTcl_GetStdChannel\fR with one of
282	\fBTCL_STDIN\fR, \fBTCL_STDOUT\fR, or \fBTCL_STDERR\fR as the \fItype\fR. The
283	return value will be a valid channel, or NULL.
284	.PP
285	A new channel can be set for the standard channel specified by \fItype\fR
286	by calling \fBTcl_SetStdChannel\fR with a new channel or NULL in the
287	\fIchannel\fR argument. If the specified channel is closed by a later call to
288	\fBTcl_Close\fR, then the corresponding standard channel will automatically be
289	set to NULL.
290	.PP
291	If \fBTcl_GetStdChannel\fR is called before \fBTcl_SetStdChannel\fR, Tcl will
292	construct a new channel to wrap the appropriate platform-specific standard
293	file handle. If \fBTcl_SetStdChannel\fR is called before
294	\fBTcl_GetStdChannel\fR, then the default channel will not be created.
295	.PP
296	If one of the standard channels is set to NULL, either by calling
297	\fBTcl_SetStdChannel\fR with a NULL \fIchannel\fR argument, or by calling
298	\fBTcl_Close\fR on the channel, then the next call to \fBTcl_CreateChannel\fR
299	will automatically set the standard channel with the newly created channel. If
300	more than one standard channel is NULL, then the standard channels will be
301	assigned starting with standard input, followed by standard output, with
302	standard error being last.
303	.PP
304	See \fBTcl_StandardChannels\fR for a general treatise about standard
305	channels and the behaviour of the Tcl library with regard to them.
306	.PP
307
308	.SH "SEE ALSO"
309	Tcl_Close(3), Tcl_CreateChannel(3), Tcl_Main(3), tclsh(1)
310
311	.SH KEYWORDS
312	standard channel, standard input, standard output, standard error