Tcl_CreateCloseHandler(3)

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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  cre-
                                                ate  or  delete  a close call-
                                                back.

       Tcl_CloseProc   *proc          (in)      The procedure to call  as  the
                                                callback.

       ClientData      clientData     (in)      Arbitrary  one-word  value  to
                                                pass to proc.
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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)