Tcl_CreateCloseHandler man page on RedHat

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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_Deleteā€
       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)
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