hpux man page for xselectinput

XSelectInput()															    XSelectInput()

Name
  XSelectInput - select the event types to be sent to a window.

Synopsis
  XSelectInput(display, w, event_mask)
	Display *display;
	Window w;
	long event_mask;

Arguments
  display   Specifies a connection to an X server; returned from XOpenDisplay().

  w	    Specifies the ID of the window interested in the events.

  event_mask
	    Specifies the event mask.  This mask is the bitwise OR of one or more of the valid event mask bits (see below).

Description
  XSelectInput()  defines  which  input  events  the  window is interested in.	If a window is not interested in a device event (button, key,
  motion, or border crossing), it propagates up to the closest ancestor unless otherwise specified in the do_not_propagate_mask attribute.

  The bits of the mask are defined in <X11/X.h> :

  ButtonPressMask	NoEventMask
  ButtonReleaseMask	KeyPressMask
  EnterWindowMask	KeyReleaseMask
  LeaveWindowMask	ExposureMask
  PointerMotionMask	VisibilityChangeMask
  PointerMotionHintMask StructureNotifyMask
  Button1MotionMask	ResizeRedirectMask
  Button2MotionMask	SubstructureNotifyMask
  Button3MotionMask	SubstructureRedirectMask
  Button4MotionMask	FocusChangeMask
  Button5MotionMask	PropertyChangeMask
  ButtonMotionMask	ColormapChangeMask
  KeymapStateMask	OwnerGrabButtonMask

  A call on XSelectInput() overrides any previous call on XSelectInput() for the same window from the same client but not for other  clients.
  Multiple  clients can select input on the same window; their event_mask window attributes are disjoint.  When an event is generated it will
  be reported to all interested clients.  However, only one client at a time can select for each of SubstructureRedirectMask, ResizeRedirect-
  Mask, and ButtonPress.

  If  a  window  has both ButtonPressMask and ButtonReleaseMask selected, then a ButtonPress event in that window will automatically grab the
  mouse until all buttons are released, with events sent to windows as described for XGrabPointer().  This ensures that a window will see the
  ButtonRelease event corresponding to the ButtonPress event, even though the mouse may have exited the window in the meantime.

  If  PointerMotionMask  is  selected,	events	will  be sent independent of the state of the mouse buttons.  If instead, one or more of But-
  ton1MotionMask, Button2MotionMask, Button3MotionMask, Button4MotionMask, or Button5MotionMask is selected, MotionNotify events will be gen-
  erated only when one or more of the specified buttons is depressed.

  XCreateWindow() and XChangeWindowAttributes() can also set the event_mask attribute.

  For more information, see Volume One, Chapter 8, Events.

Errors
  BadValue  Specified event mask invalid.

  BadWindow

See Also
  XQLength(),	XAllowEvents(),   XCheckIfEvent(),   XCheckMaskEvent(),  XCheckTypedEvent(),  XCheckTypedWindowEvent(),  XCheckWindowEvent(),
  XEventsQueued(), XGetInputFocus(), XGetMotionEvents(), XIfEvent(), XMaskEvent(), XNextEvent(),  XPeekEvent(),  XPeekIfEvent(),  XPending(),
  XPutBackEvent(), XSendEvent(), XSetInputFocus(), XSynchronize(), XWindowEvent().

Xlib - Input Handling														    XSelectInput()