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Tcl_Exit(3)		    Tcl Library Procedures		   Tcl_Exit(3)


       Tcl_Exit,  Tcl_Finalize, Tcl_CreateExitHandler, Tcl_DeleteExitHandler -
       end the application (and invoke exit handlers)

       #include <tcl.h>



       Tcl_CreateExitHandler(proc, clientData)

       Tcl_DeleteExitHandler(proc, clientData)

       int	      status	   (in)	     Provides  information  about  why
					     application  exited.  Exact mean‐
					     ing may be platform-specific.   0
					     usually  means a normal exit, any
					     nonzero value usually means  that
					     an error occurred.

       Tcl_ExitProc   *proc	   (in)	     Procedure	to invoke before exit‐
					     ing application.

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

       The  procedures	described here provide a graceful mechanism to end the
       execution of a Tcl application. Exit handlers are  invoked  to  cleanup
       the application's state before ending the execution of Tcl code.

       Invoke Tcl_Exit to end a Tcl application and to exit from this process.
       This procedure is invoked by the exit command, and can be invoked  any‐
       place else to terminate the application.	 No-one should ever invoke the
       exit system procedure directly;	always	invoke	Tcl_Exit  instead,  so
       that it can invoke exit handlers.  Note that if other code invokes exit
       system procedure directly, or otherwise causes the application to  ter‐
       minate  without	calling	 Tcl_Exit,  the exit handlers will not be run.
       Tcl_Exit internally invokes the exit system call, thus it never returns
       control to its caller.

       Tcl_Finalize  is	 similar to Tcl_Exit except that it does not exit from │
       the current process.  It is useful for cleaning up when	a  process  is │
       finished	 using	Tcl  but wishes to continue executing, and when Tcl is │
       used in a dynamically loaded extension that is about  to	 be  unloaded. │
       On  some	 systems  Tcl  is  automatically  notified  when  it  is being │
       unloaded, and it calls Tcl_Finalize internally; on these systems it not │
       necessary  for the caller to explicitly call Tcl_Finalize.  However, to │
       ensure portability, your code should always  invoke  Tcl_Finalize  when │
       Tcl  is	being unloaded, to ensure that the code will work on all plat‐ │
       forms. Tcl_Finalize can be safely called more than once.

       Tcl_CreateExitHandler arranges for proc to be invoked  by  Tcl_Finalize
       and  Tcl_Exit.	This  provides	a  hook for cleanup operations such as
       flushing buffers and freeing global memory.  Proc should match the type
	      typedef void Tcl_ExitProc(ClientData clientData);
       The  clientData	parameter to proc is a copy of the clientData argument
       given to Tcl_CreateExitHandler when the callback	 was  created.	 Typi‐
       cally,  clientData  points  to a data structure containing application-
       specific information about what to do in proc.

       Tcl_DeleteExitHandler may be called to delete a previously-created exit
       handler.	  It  removes  the handler indicated by proc and clientData so
       that no call to proc will be made.  If  no  such	 handler  exists  then
       Tcl_DeleteExitHandler does nothing.

       Tcl_Finalize  and  Tcl_Exit  execute  all  registered exit handlers, in │
       reverse order from the order  in	 which	they  were  registered.	  This │
       matches	the natural order in which extensions are loaded and unloaded; │
       if extension A loads extension B, it usually unloads B before it itself │
       is unloaded.  If extension A registers its exit handlers before loading │
       extension B, this ensures that any exit handlers for B will be executed │
       before the exit handlers for A.

       callback, cleanup, dynamic loading, end application, exit, unloading

Tcl				      7.7			   Tcl_Exit(3)

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