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XSetCloseDownMode, XKillClient
- control clients 
- int XSetCloseDownMode(Display *display, int close_mode);
 
- int XKillClient(Display *display, XID resource);  
- close_mode
- Specifies
the client close-down mode. You can pass  DestroyAll,   RetainPermanent,
  or RetainTemporary.   
- display
- Specifies the connection to the X server.
- resource
- Specifies any resource associated with the client that you want
to destroy or AllTemporary.   
The XSetCloseDownMode   defines
what will happen to the client's resources at connection close. A connection
starts in DestroyAll   mode. For information on what happens to the client's
resources when the close_mode argument is RetainPermanent   or RetainTemporary,
  see section 2.6.
XSetCloseDownMode   can generate a BadValue   error. 
The
XKillClient   function forces a close down of the client that created the
resource if a valid resource is specified. If the client has already terminated
in either  RetainPermanent   or  RetainTemporary   mode, all of the client's
resources are destroyed. If  AllTemporary   is specified, the resources
of all clients that have terminated in RetainTemporary   are destroyed
(see section 2.5). This permits implementation of window manager facilities
that aid debugging. A client can set its close-down mode to RetainTemporary.
  If the client then crashes, its windows would not be destroyed.  The programmer
can then inspect the application's window tree  and use the window manager
to destroy the zombie windows. 
XKillClient   can generate a BadValue   error.
- BadValue 
-   Some numeric value falls outside the range of values
accepted by the request. Unless a specific range is specified for an argument,
the full range defined by the argument's type is accepted.  Any argument
defined as a set of alternatives can generate this error. 
Xlib -
C Language X Interface
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