Tk_Init(3tk) Tk Library Procedures Tk_Init(3tk)
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NAME
Tk_Init, Tk_SafeInit - add Tk to an interpreter and make a new Tk ap-
plication.
SYNOPSIS
#include <tk.h>
int
Tk_Init(interp)
int
Tk_SafeInit(interp)
ARGUMENTS
Tcl_Interp *interp (in) Interpreter in which to load
Tk. Tk should not already be
loaded in this interpreter.
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DESCRIPTION
Tk_Init is the package initialization procedure for Tk. It is normally
invoked by the Tcl_AppInit procedure for an application or by the load
command. Tk_Init adds all of Tk's commands to interp and creates a new
Tk application, including its main window. If the initialization is
successful Tk_Init returns TCL_OK; if there is an error it returns
TCL_ERROR. Tk_Init also leaves a result or error message in inter-
preter interp's result.
If there is a variable argv in interp, Tk_Init treats the contents of
this variable as a list of options for the new Tk application. The op-
tions may have any of the forms documented for the wish application (in
fact, wish uses Tk_Init to process its command-line arguments).
Tk_SafeInit is identical to Tk_Init except that it removes all Tk com-
mands that are considered unsafe. Those commands and the reasons for
their exclusion are:
bell Continuous ringing of the bell is a nuisance.
clipboard
A malicious script could replace the contents of the clipboard
with the string “rm -r *” and lead to surprises when the con-
tents of the clipboard are pasted.
grab Grab can be used to block the user from using any other applica-
tions.
menu Menus can be used to cover the entire screen and to steal input
from the user.
selection
See clipboard.
send Send can be used to cause unsafe interpreters to execute com-
mands.
tk The tk command recreates the send command, which is unsafe.
tkwait Tkwait can block the containing process forever
toplevel
Toplevels can be used to cover the entire screen and to steal
input from the user.
wm If toplevels are ever allowed, wm can be used to remove decora-
tions, move windows around, etc.
KEYWORDS
safe, application, initialization, load, main window
Tk 8.0 Tk_Init(3tk)
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