action command Post: 79330

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tcl_createclosehandler

Tcl_CreateCloseHandler(3)				      Tcl Library Procedures					 Tcl_CreateCloseHandler(3)

__________________________________________________________________________________________________________________________________________________

NAME

       Tcl_CreateCloseHandler, Tcl_DeleteCloseHandler - 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_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_Delete-
       CloseHandler 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

Tcl									7.5						 Tcl_CreateCloseHandler(3)