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author | dkf <donal.k.fellows@manchester.ac.uk> | 2007-10-28 14:17:38 (GMT) |
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committer | dkf <donal.k.fellows@manchester.ac.uk> | 2007-10-28 14:17:38 (GMT) |
commit | ccacc920f9cd610a9a9d8e800f623c20bf43a702 (patch) | |
tree | daec40c266097bb1d38f10254010691b0131d4cc /doc/CrtChnlHdlr.3 | |
parent | 8ffb8fa76d0d34283e491044dd28385674ba113e (diff) | |
download | tcl-ccacc920f9cd610a9a9d8e800f623c20bf43a702.zip tcl-ccacc920f9cd610a9a9d8e800f623c20bf43a702.tar.gz tcl-ccacc920f9cd610a9a9d8e800f623c20bf43a702.tar.bz2 |
First stage of doing GOOBE improvements to documentation now that the html generation works
Diffstat (limited to 'doc/CrtChnlHdlr.3')
-rw-r--r-- | doc/CrtChnlHdlr.3 | 184 |
1 files changed, 92 insertions, 92 deletions
diff --git a/doc/CrtChnlHdlr.3 b/doc/CrtChnlHdlr.3 index 8988c63..8a9409b 100644 --- a/doc/CrtChnlHdlr.3 +++ b/doc/CrtChnlHdlr.3 @@ -1,92 +1,92 @@ -'\" -'\" Copyright (c) 1996 Sun Microsystems, Inc. -'\" -'\" See the file "license.terms" for information on usage and redistribution -'\" of this file, and for a DISCLAIMER OF ALL WARRANTIES. -'\" -'\" RCS: @(#) $Id: CrtChnlHdlr.3,v 1.3 2004/10/07 14:44:31 dkf Exp $ -.so man.macros -.TH Tcl_CreateChannelHandler 3 7.5 Tcl "Tcl Library Procedures" -.BS -'\" Note: do not modify the .SH NAME line immediately below! -.SH NAME -Tcl_CreateChannelHandler, Tcl_DeleteChannelHandler \- call a procedure when a channel becomes readable or writable -.SH SYNOPSIS -.nf -.nf -\fB#include <tcl.h>\fR -.sp -void -\fBTcl_CreateChannelHandler\fR(\fIchannel, mask, proc, clientData\fR) -.sp -void -\fBTcl_DeleteChannelHandler\fR(\fIchannel, proc, clientData\fR) -.sp -.SH ARGUMENTS -.AS Tcl_ChannelProc clientData -.AP Tcl_Channel channel in -Tcl channel such as returned by \fBTcl_CreateChannel\fR. -.AP int mask in -Conditions under which \fIproc\fR should be called: OR-ed combination of -\fBTCL_READABLE\fR, \fBTCL_WRITABLE\fR and \fBTCL_EXCEPTION\fR. Specify -a zero value to temporarily disable an existing handler. -.AP Tcl_FileProc *proc in -Procedure to invoke whenever the channel indicated by \fIchannel\fR meets -the conditions specified by \fImask\fR. -.AP ClientData clientData in -Arbitrary one-word value to pass to \fIproc\fR. -.BE - -.SH DESCRIPTION -.PP -\fBTcl_CreateChannelHandler\fR arranges for \fIproc\fR to be called in the -future whenever input or output becomes possible on the channel identified -by \fIchannel\fR, or whenever an exceptional condition exists for -\fIchannel\fR. The conditions of interest under which \fIproc\fR will be -invoked are specified by the \fImask\fR argument. -See the manual entry for \fBfileevent\fR for a precise description of -what it means for a channel to be readable or writable. -\fIProc\fR must conform to the following prototype: -.CS -typedef void Tcl_ChannelProc( - ClientData \fIclientData\fR, - int \fImask\fR); -.CE -.PP -The \fIclientData\fR argument is the same as the value passed to -\fBTcl_CreateChannelHandler\fR when the handler was created. Typically, -\fIclientData\fR points to a data structure containing application-specific -information about the channel. \fIMask\fR is an integer mask indicating -which of the requested conditions actually exists for the channel; it will -contain a subset of the bits from the \fImask\fR argument to -\fBTcl_CreateChannelHandler\fR when the handler was created. -.PP -Each channel handler is identified by a unique combination of \fIchannel\fR, -\fIproc\fR and \fIclientData\fR. -There may be many handlers for a given channel as long as they don't -have the same \fIchannel\fR, \fIproc\fR, and \fIclientData\fR. -If \fBTcl_CreateChannelHandler\fR is invoked when there is already a handler -for \fIchannel\fR, \fIproc\fR, and \fIclientData\fR, then no new -handler is created; instead, the \fImask\fR is changed for the -existing handler. -.PP -\fBTcl_DeleteChannelHandler\fR deletes a channel handler identified by -\fIchannel\fR, \fIproc\fR and \fIclientData\fR; if no such handler exists, -the call has no effect. -.PP -Channel handlers are invoked via the Tcl event mechanism, so they -are only useful in applications that are event-driven. -Note also that the conditions specified in the \fImask\fR argument -to \fIproc\fR may no longer exist when \fIproc\fR is invoked: for -example, if there are two handlers for \fBTCL_READABLE\fR on the same -channel, the first handler could consume all of the available input -so that the channel is no longer readable when the second handler -is invoked. -For this reason it may be useful to use nonblocking I/O on channels -for which there are event handlers. - -.SH "SEE ALSO" -Notifier(3), Tcl_CreateChannel(3), Tcl_OpenFileChannel(3), vwait(n). - -.SH KEYWORDS -blocking, callback, channel, events, handler, nonblocking. +'\"
+'\" Copyright (c) 1996 Sun Microsystems, Inc.
+'\"
+'\" See the file "license.terms" for information on usage and redistribution
+'\" of this file, and for a DISCLAIMER OF ALL WARRANTIES.
+'\"
+'\" RCS: @(#) $Id: CrtChnlHdlr.3,v 1.4 2007/10/28 14:17:38 dkf Exp $
+.so man.macros
+.TH Tcl_CreateChannelHandler 3 7.5 Tcl "Tcl Library Procedures"
+.BS
+'\" Note: do not modify the .SH NAME line immediately below!
+.SH NAME
+Tcl_CreateChannelHandler, Tcl_DeleteChannelHandler \- call a procedure when a channel becomes readable or writable
+.SH SYNOPSIS
+.nf
+.nf
+\fB#include <tcl.h>\fR
+.sp
+void
+\fBTcl_CreateChannelHandler\fR(\fIchannel, mask, proc, clientData\fR)
+.sp
+void
+\fBTcl_DeleteChannelHandler\fR(\fIchannel, proc, clientData\fR)
+.sp
+.SH ARGUMENTS
+.AS Tcl_ChannelProc clientData
+.AP Tcl_Channel channel in
+Tcl channel such as returned by \fBTcl_CreateChannel\fR.
+.AP int mask in
+Conditions under which \fIproc\fR should be called: OR-ed combination of
+\fBTCL_READABLE\fR, \fBTCL_WRITABLE\fR and \fBTCL_EXCEPTION\fR. Specify
+a zero value to temporarily disable an existing handler.
+.AP Tcl_FileProc *proc in
+Procedure to invoke whenever the channel indicated by \fIchannel\fR meets
+the conditions specified by \fImask\fR.
+.AP ClientData clientData in
+Arbitrary one-word value to pass to \fIproc\fR.
+.BE
+
+.SH DESCRIPTION
+.PP
+\fBTcl_CreateChannelHandler\fR arranges for \fIproc\fR to be called in the
+future whenever input or output becomes possible on the channel identified
+by \fIchannel\fR, or whenever an exceptional condition exists for
+\fIchannel\fR. The conditions of interest under which \fIproc\fR will be
+invoked are specified by the \fImask\fR argument.
+See the manual entry for \fBfileevent\fR for a precise description of
+what it means for a channel to be readable or writable.
+\fIProc\fR must conform to the following prototype:
+.CS
+typedef void Tcl_ChannelProc(
+ ClientData \fIclientData\fR,
+ int \fImask\fR);
+.CE
+.PP
+The \fIclientData\fR argument is the same as the value passed to
+\fBTcl_CreateChannelHandler\fR when the handler was created. Typically,
+\fIclientData\fR points to a data structure containing application-specific
+information about the channel. \fIMask\fR is an integer mask indicating
+which of the requested conditions actually exists for the channel; it will
+contain a subset of the bits from the \fImask\fR argument to
+\fBTcl_CreateChannelHandler\fR when the handler was created.
+.PP
+Each channel handler is identified by a unique combination of \fIchannel\fR,
+\fIproc\fR and \fIclientData\fR.
+There may be many handlers for a given channel as long as they do not
+have the same \fIchannel\fR, \fIproc\fR, and \fIclientData\fR.
+If \fBTcl_CreateChannelHandler\fR is invoked when there is already a handler
+for \fIchannel\fR, \fIproc\fR, and \fIclientData\fR, then no new
+handler is created; instead, the \fImask\fR is changed for the
+existing handler.
+.PP
+\fBTcl_DeleteChannelHandler\fR deletes a channel handler identified by
+\fIchannel\fR, \fIproc\fR and \fIclientData\fR; if no such handler exists,
+the call has no effect.
+.PP
+Channel handlers are invoked via the Tcl event mechanism, so they
+are only useful in applications that are event-driven.
+Note also that the conditions specified in the \fImask\fR argument
+to \fIproc\fR may no longer exist when \fIproc\fR is invoked: for
+example, if there are two handlers for \fBTCL_READABLE\fR on the same
+channel, the first handler could consume all of the available input
+so that the channel is no longer readable when the second handler
+is invoked.
+For this reason it may be useful to use nonblocking I/O on channels
+for which there are event handlers.
+
+.SH "SEE ALSO"
+Notifier(3), Tcl_CreateChannel(3), Tcl_OpenFileChannel(3), vwait(n).
+
+.SH KEYWORDS
+blocking, callback, channel, events, handler, nonblocking.
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