GNU/Linux man pages
Livre :
Expressions régulières,
Syntaxe et mise en oeuvre :
GNU/Linux |
RedHat 5.2(Apollo) |
|
 |
Tcl_Exit(3) |
 |
______________________________________________________________________________
Tcl_Exit, Tcl_Finalize, Tcl_CreateExitHandler, Tcl_DeleteExitHandler − end the application (and invoke exit handlers)
#include <tcl.h>
Tcl_Exit(status)
Tcl_Finalize()
Tcl_CreateExitHandler(proc, clientData)
Tcl_DeleteExitHandler(proc, clientData)
|
int status (in) |
Provides information about why application exited. Exact meaning 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 exiting 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 anyplace 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 terminate 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 │ platforms. 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 Tcl_ExitProc:
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. Typically, 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_Exit(3) | |