XkbGetDeviceLedInfo man page
XkbGetDeviceLedInfo — Query the indicator names, maps, and state associated with an LED feedback of an input extension device
Status XkbGetDeviceLedInfo (Display *dpy, XkbDeviceInfoPtr device_info, unsigned int led_class, unsigned int led_id, unsigned int which);
- - dpy
connection to X server
- - device_info
structure to update with results
- - led_class
LED feedback class assigned by input extension
- - led_id
LED feedback ID assigned by input extension
- - which
mask indicating desired information
XkbGetDeviceLedInfo queries the server for the desired LED information for the feedback specified by led_class and led_id for the X input extension device indicated by device_spec->device_info and waits for a reply. If successful, XkbGetDeviceLedInfo backfills the relevant fields of device_info as determined by which with the results and returns Success. Valid values for which are the inclusive OR of any of XkbXI_IndicatorNamesMask, XkbXI_IndicatorMapsMask, and XkbXI_IndicatorStateMask.
The fields of device_info that are filled in when this request succeeds are name, type, supported, and unsupported, and portions of the leds structure corresponding to led_class and led_id as indicated by the bits set in which. The device_info->leds vector is allocated if necessary and sz_leds and num_leds filled in. The led_class, led_id and phys_indicators fields of the device_info->leds entry corresponding to led_class and led_id are always filled in.
If which contains XkbXI_IndicatorNamesMask, the names_present and names fields of the device_info->leds structure corresponding to led_class and led_id are updated, if which contains XkbXI_IndicatorStateMask, the corresponding state field is updated, and if which contains XkbXI_IndicatorMapsMask, the maps_present and maps fields are updated.
If a compatible version of Xkb is not available in the server or the Xkb extension has not been properly initialized, XkbGetDeviceLedInfo returns BadAccess. If allocation errors occur, a BadAlloc status is returned. If the device has no indicators, a BadMatch error is returned. If ledClass or ledID have illegal values, a BadValue error is returned. If they have legal values but do not specify a feedback that contains LEDs and is associated with the specified device, a BadMatch error is returned.
The Xkb extension has not been properly initialized
Unable to allocate storage
A compatible version of Xkb was not available in the server or an argument has correct type and range, but is otherwise invalid
An argument is out of range