XSetCloseDownMode, XKillClient - control clients

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.

       XSetCloseDownMode, XKillClient - control clients

Xlib-CLanguageXInterface

X Version 11                                      libX11 1.8.12                             XSetCloseDownMode(3)

       int XSetCloseDownMode(Display *display, int close_mode);

       int XKillClient(Display *display, XID resource);