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 call
back.

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 chan_ nel. The proc and clientData identify which close call back 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

Tcl 7.5 Tcl_CreateCloseHandler(3)