OS X Leopard is now certified Unix, but is it safe? - InfoWorld
InfoWorldOS X Leopard is now certified Unix, but is it safe? InfoWorld, CA - Aug 1, 2007 I am genuinely unconcerned about those who see such statements as blasphemous or as baiting the Linux community. Those who frequent Enterprise Mac or Ahead ...
Hi,
I am Solaris 9 developer and notice that the documentation does not provide a clear notion of the inherent concurrency in routines defined as "Async-Signal-Safe".
Routines defined as "MT-Safe" obviously have the best level of concurrency, compared to normal "Safe" interfaces.
I have... (1 Reply)
Safe Tk(n) Tk Built-In Commands Safe Tk(n)
__________________________________________________________________________________________________________________________________________________NAME
loadTk - Load Tk into a safe interpreter.
SYNOPSIS
::safe::loadTk slave ?-use windowId? ?-display displayName?
_________________________________________________________________DESCRIPTION
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 inter-
preter must have been created with ::safe::interpCreate or have been initialized with ::safe::interpInit. 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 (e.g. .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.
SECURITY ISSUES
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.
SEE ALSO
safe(n), interp(n), library(n), load(n), package(n), source(n), unknown(n)
KEYWORDS
alias, auto-loading, auto_mkindex, load, master interpreter, safe interpreter, slave interpreter, source
Tk 8.0 Safe Tk(n)
08-04-2007
