loadTk - Load Tk into a safe interpreter.


::safe::loadTk slave ?-use windowId? ?-display displayName?
Safe Tk is based on Safe Tcl, which provides a mechanism that allows restricted and mediated access to auto-loading and packages for safe interpreters. Safe Tk adds the ability to configure the interpreter for safe Tk operations and load Tk into safe interpreters.


The ::safe::loadTk command initializes the required data structures in the named safe interpreter and then loads Tk into it. The command returns the name of the safe interpreter. If -use is specified, the window identified by the specified system dependent identifier windowId is used to contain the ``.'' window of the safe interpreter; it can be any valid id, eventually referencing a window belonging to another application. As a convenience, if the window you plan to use is a Tk Window of the application you can use the window name (eg: .x.y) instead of its window Id ([winfo id .x.y]). When -use is not specified, a new toplevel window is created for the ``.'' window of the safe interpreter. On X11 if you want the embedded window to use another display than the default one, specify it with -display. See the SECURITY ISSUES section below for implementation details.


Please read the safe manual page for Tcl to learn about the basic security considerations for Safe Tcl.

::safe::loadTk adds the value of tk_library taken from the master interpreter to the virtual access path of the safe interpreter so that auto-loading will work in the safe interpreter.

Tk initialization is now safe with respect to not trusting the slave's state for startup. ::safe::loadTk registers the slave's name so when the Tk initialization (Tk_SafeInit) is called and in turn calls the master's ::safe::InitTk it will return the desired argv equivalent (-use windowId, correct -display, etc...).

When -use is not used, the new toplevel created is specially decorated so the user is always aware that the user interface presented comes from a potentially unsafe code and can easily delete the corresponding interpreter.

On X11, conflicting -use and -display are likely to generate a fatal X error.


safe, interp, library, load, package, source, unknown


alias, auto-loading, auto_mkindex, load, master interpreter, safe interpreter, slave interpreter, source
Copyright © 1995-1996 Sun Microsystems, Inc.
Copyright © 1995-1997 Roger E. Critchlow Jr.