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download PDF document: XIGetSelectedEvents.3.pdf

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; 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.
09/15/2021 XISELECTEVENTS(3)