xigetselectedevents(3) [centos man page]

XISELECTEVENTS(3)														 XISELECTEVENTS(3)

NAME

       XISelectEvents, XIGetSelectedEvents - select for or get selected XI2 events on the window.

SYNOPSIS

       #include <X11/extensions/XInput2.h>

       Status XISelectEvents( Display *display,
			      Window win,
			      XIEventMask *masks,
			      int num_masks);

       display
	      Specifies the connection to the X server.

       masks
	      Device event mask.

       num_masks
	      Number of masks in masks.

       win
	      Specifies the window.

       XIEventMask *XIGetSelectedEvents( Display *display,
					 Window win,
					 int *num_masks_return);

       display
	      Specifies the connection to the X server.

       num_masks_return
	      Number of masks in the return value.

       win
	      Specifies the window.

DESCRIPTION

	   XI2 events must be selected using XISelectEvents.

	   XISelectEvents sets the event mask for this client on win.
	   Further events are only reported to this client if the event
	   type matches the selected event mask. The masks overrides the
	   previously selected event mask for the given device.

	   If deviceid is a valid device, the event mask is selected only
	   for this device. If deviceid is XIAllDevices or
	   XIAllMasterDevices, the event mask is selected for all devices
	   or all master devices, respectively. The effective event mask
	   is the bit-wise OR of the XIAllDevices, XIAllMasterDevices and
	   the respective device's event mask.

	   typedef struct {
	       int deviceid;
	       int mask_len;
	       unsigned char* mask;
	   } XIEventMask;

	   The mask_len specifies the length of mask in bytes. mask is a
	   binary mask in the form of (1 << event type). deviceid must be
	   either a device or XIAllDevices or XIAllMasterDevices. A client
	   may submit several masks with the same deviceid in one request
	   but only the last mask will be effective.

	   XISelectEvents can generate a BadValue, a BadDevice, and a
	   BadWindow error.

	   XIGetSelectedEvents returns the events selected by this client on the given
	   window. If no events were selected on this window, XIGetSelectedEvents
	   returns NULL and num_masks_return is set to 0. If an internal error occurs,
	   XIGetSelectedEvents returns NULL and num_masks_return is set to -1.
	   Otherwise, XIGetSelectedEvent returns the selected event masks for all
	   devices including the masks for XIAllDevices and XIAllMasterDevices

	   The caller must free the returned data using XFree().

DIAGNOSTICS

	   BadValue
		  A value is outside of the permitted range.

	   BadWindow
		  A value for a Window argument does not name a defined
		  window.

	   BadDevice
		  An invalid device was specified. The device does not
		  exist.

								    03/09/2013							 XISELECTEVENTS(3)

Check Out this Related Man Page

XSelectInput(3X11)						  XLIB FUNCTIONS						XSelectInput(3X11)

NAME

       XSelectInput - select input events

SYNTAX

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

ARGUMENTS

       display	 Specifies the connection to the X server.

       event_mask
		 Specifies the event mask.

       w	 Specifies the window whose events you are interested in.

DESCRIPTION

       The XSelectInput function requests that the X server report the events associated with the specified event mask.  Initially, X will not
       report any of these events.  Events are reported relative to a window.  If a window is not interested in a device event, it usually propa-
       gates to the closest ancestor that is interested, unless the do_not_propagate mask prohibits it.

       Setting the event-mask attribute of a window overrides any previous call for the same window but not for other clients.	Multiple clients
       can select for the same events on the same window with the following restrictions:

       o    Multiple clients can select events on the same window because their event masks are disjoint.  When the X server generates an event,
	    it reports it to all interested clients.

       o    Only one client at a time can select CirculateRequest, ConfigureRequest, or MapRequest events, which are associated with the event
	    mask SubstructureRedirectMask.

       o    Only one client at a time can select a ResizeRequest event, which is associated with the event mask ResizeRedirectMask.

       o    Only one client at a time can select a ButtonPress event, which is associated with the event mask ButtonPressMask.

       The server reports the event to all interested clients.

       XSelectInput can generate a BadWindow error.

DIAGNOSTICS

       BadWindow A value for a Window argument does not name a defined Window.

SEE ALSO

       Xlib - C Language X Interface

X Version 11							    Release 6.6 						XSelectInput(3X11)

Linux and UNIX Man Pages

xigetselectedevents(3) [centos man page]

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