Tcl_CreateCloseHandler (3)
arrange for callbacks when channels are closed
SYNOPSIS
#include <tcl.h>
void
Tcl_CreateCloseHandler(channel, proc, clientData)
void
Tcl_DeleteCloseHandler(channel, proc, clientData)
ARGUMENTS
Tcl_CloseProc callbackData in
Tcl_Channel channel in
The channel for which to create or delete a close callback.
Tcl_CloseProc *proc in
The procedure to call as the callback.
ClientData clientData in
Arbitrary one-word value to pass to proc.
DESCRIPTION
Tcl_CreateCloseHandler arranges for proc to be called when
channel is closed with Tcl_Close or
Tcl_UnregisterChannel, or using the Tcl close command.
Proc should match the following prototype:
typedef void Tcl_CloseProc(
ClientData clientData);
The clientData is the same as the value provided in the call to
Tcl_CreateCloseHandler.
Tcl_DeleteCloseHandler removes a close callback for channel.
The proc and clientData identify which close callback to
remove; Tcl_DeleteCloseHandler does nothing if its proc and
clientData arguments do not match the proc and clientData
for a close handler for channel.
SEE ALSO
- close (n) -
Tcl_Close(3) Tcl_UnregisterChannel(3)
KEYWORDS
callback, channel closing
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