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-'\"
-'\" 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.
-'\"
-.TH Tcl_CreateChannelHandler 3 7.5 Tcl "Tcl Library Procedures"
-.so man.macros
-.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:
-.PP
-.CS
-typedef void \fBTcl_ChannelProc\fR(
-        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.