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Test Your Knowledge in Computers #601
Difficulty: Medium
Consider the Unix command sequence ps aux | grep -iv apache2 | wc -l This command will output the total number of apache2 processes running.
True or False?
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tk_mainloop(3) [redhat man page]

Tk_MainLoop(3)						       Tk Library Procedures						    Tk_MainLoop(3)

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NAME
Tk_MainLoop - loop for events until all windows are deleted SYNOPSIS
#include <tk.h> Tk_MainLoop() _________________________________________________________________ DESCRIPTION
Tk_MainLoop is a procedure that loops repeatedly calling Tcl_DoOneEvent. It returns only when there are no applications left in this process (i.e. no main windows exist anymore). Most windowing applications will call Tk_MainLoop after initialization; the main execution of the application will consist entirely of callbacks invoked via Tcl_DoOneEvent. KEYWORDS
application, event, main loop Tk Tk_MainLoop(3)

Check Out this Related Man Page

Tk_CreateClientMessageHandler(3)			       Tk Library Procedures				  Tk_CreateClientMessageHandler(3)

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NAME
Tk_CreateClientMessageHandler, Tk_DeleteClientMessageHandler - associate procedure callback with ClientMessage type X events SYNOPSIS
#include <tk.h> Tk_CreateClientMessageHandler(proc) Tk_DeleteClientMessageHandler(proc) ARGUMENTS
Tk_ClientMessageProc *proc (in) Procedure to invoke whenever a ClientMessage X event occurs on any display. _________________________________________________________________ DESCRIPTION
Tk_CreateClientMessageHandler arranges for proc to be invoked in the future whenever a ClientMessage X event occurs that is not handled by WM_PROTOCOL. Tk_CreateClientMessageHandler is intended for use by applications which need to watch X ClientMessage events, such as drag and drop applications. The callback to proc will be made by Tk_HandleEvent; this mechanism only works in programs that dispatch events through Tk_HandleEvent (or through other Tk procedures that call Tk_HandleEvent, such as Tk_DoOneEvent or Tk_MainLoop). Proc should have arguments and result that match the type Tk_ClientMessageProc: typedef int Tk_ClientMessageProc( Tk_Window tkwin, XEvent *eventPtr); The tkwin parameter to proc is the Tk window which is associated with this event. EventPtr is a pointer to the X event. Whenever an X ClientMessage event is processed by Tk_HandleEvent, the proc is called if it was not handled as a WM_PROTOCOL. The return value from proc is normally 0. A non-zero return value indicates that the event is not to be handled further; that is, proc has done all processing that is to be allowed for the event. If there are multiple ClientMessage event handlers, each one is called for each event, in the order in which they were established. Tk_DeleteClientMessageHandler may be called to delete a previously-created ClientMessage event handler: it deletes each handler it finds that matches the proc argument. If no such handler exists, then Tk_DeleteClientMessageHandler returns without doing anything. Although Tk supports it, it's probably a bad idea to have more than one callback with the same proc argument. KEYWORDS
bind, callback, event, handler Tk 8.4 Tk_CreateClientMessageHandler(3)

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