XGETFEEDBACKCONTROL - Online Linux Manual PageSection : 3
Updated : 09/15/2021
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NAMEXGetFeedbackControl, XChangeFeedbackControl − query and change input device feedbacks

SYNOPSIS#include <X11/extensions/XInput​.h>XFeedbackState *XGetFeedbackControl( Display *display, XDevice *device, int *num_feedbacks);int XChangeFeedbackControl( Display *display, XDevice *device, Mask mask, XFeedbackControl *control);display Specifies the connection to the X server​.device Specifies the device whose feedbacks are to be queried or modified​.num_feedbacks Specifies an address into which the number of feedbacks supported by the device is to be returned​.mask Specifies a mask specific to each type of feedback that describes how the feedback is to be modified​.control Specifies the address of an XFeedbackControl structure that contains the new values for the feedback​.

DESCRIPTIONThese requests are provided to manipulate those input devices that support feedbacks​. A BadMatch error will be generated if the requested device does not support feedbacks​. Whether or not a given device supports feedbacks can be determined by examining the information returned by the XOpenDevice request​. For those devices that support feedbacks, XOpenDevice will return an XInputClassInfo structure with the input_class field equal to the constant FeedbackClass (defined in the file XI​.h)​.The XGetFeedbackControl request returns a pointer to a list of XFeedbackState structures​. Each item in this list describes one of the feedbacks supported by the device​. The items are variable length, so each contains its length to allow traversal to the next item in the list​.The feedback classes that are currently defined are: KbdFeedbackClass, PtrFeedbackClass, StringFeedbackClass, IntegerFeedbackClass, LedFeedbackClass, and BellFeedbackClass​. These constants are defined in the file XI​.h​. An input device may support zero or more classes of feedback, and may support multiple feedbacks of the same class​. Each feedback contains a class identifier and an id that is unique within that class for that input device​. The id is used to identify the feedback when making an XChangeFeedbackControl request​.XGetFeedbackControl can generate a BadDevice or BadMatch error​.The XChangeFeedbackControl request modifies the values of one feedback on the specified device​. The feedback is identified by the id field of the XFeedbackControl structure that is passed with the request​. The fields of the feedback that are to be modified are identified by the bits of the mask that is passed with the request​.XChangeFeedbackControl can generate a BadDevice, BadMatch, or BadValue error​.

StructuresEach class of feedback is described by a structure specific to that class​. These structures are defined in the file XInput​.h​. XFeedbackState and XFeedbackControl are generic structures that contain three fields that are at the beginning of each class of feedback:typedef struct { XID class; int length; XID id; } XFeedbackState, XFeedbackControl;The XKbdFeedbackState structure defines the attributes that are returned for feedbacks equivalent to those on the X keyboard​.typedef struct { XID class; int length; XID id; int click; int percent; int pitch; int duration; int led_mask; int global_auto_repeat; char auto_repeats[32]; } XKbdFeedbackState;The XPtrFeedbackState structure defines the attributes that are returned for feedbacks equivalent to those on the the X pointer​.typedef struct { XID class; int length; XID id; int accelNum; int accelDenom; int threshold; } XPtrFeedbackState;The XIntegerFeedbackState structure defines attributes that are returned for integer feedbacks​.typedef struct { XID class; int length; XID id; int resolution; int minVal; int maxVal; } XIntegerFeedbackState;The XStringFeedbackState structure defines the attributes that are returned for string feedbacks​.typedef struct { XID class; int length; XID id; int max_symbols; int num_syms_supported; KeySym *syms_supported; } XStringFeedbackState;The XBellFeedbackState structure defines the attributes that are returned for bell feedbacks​.typedef struct { XID class; int length; XID id; int percent; int pitch; int duration; } XBellFeedbackState;The XLedFeedbackState structure defines the attributes that are returned for LED feedbacks​.typedef struct { XID class; int length; XID id; int led_values; } XLedFeedbackState;The XPrtFeedbackControl structure defines the attributes that can be controlled for pointer feedbacks​.typedef struct { XID class; int length; XID id; int accelNum; int accelDenom; int threshold; } XPtrFeedbackControl;The XKbdFeedbackControl structure defines the attributes that can be controlled for keyboard feedbacks​.typedef struct { XID class; int length; XID id; int click; int percent; int pitch; int duration; int led_mask; int led_value; int key; int auto_repeat_mode; } XKbdFeedbackControl;The XStringFeedbackControl structure defines the attributes that can be controlled for string feedbacks​.typedef struct { XID class; int length; XID id; int num_keysyms; KeySym *syms_to_display; } XStringFeedbackControl;The XIntegerFeedbackControl structure defines the attributes that can be controlled for integer feedbacks​.typedef struct { XID class; int length; XID id; int int_to_display; } XIntegerFeedbackControl;The XBellFeedbackControl structure defines the attributes that can be controlled for bell feedbacks​.typedef struct { XID class; int length; XID id; int percent; int pitch; int duration; } XBellFeedbackControl;The XLedFeedbackControl structure defines the attributes that can be controlled for LED feedbacks​.typedef struct { XID class; int length; XID id; int led_mask; int led_values; } XLedFeedbackControl;

DIAGNOSTICSBadDevice An invalid device was specified​. The specified device does not exist or has not been opened by this client via XOpenInputDevice​. This error may also occur if some other client has caused the specified device to become the X keyboard or X pointer device via the XChangeKeyboardDevice or XChangePointerDevice requests​.BadMatch This error may occur if an XGetFeedbackControl request was made specifying a device that has no feedbacks, or an XChangeFeedbackControl request was made with an XFeedbackControl structure that contains an invalid feedback type​. It may also occur if an invalid combination of mask bits is specified ( DvKey but no DvAutoRepeatMode for keyboard feedbacks), or if an invalid KeySym is specified for a string feedback​.BadValue Some numeric value falls outside the range of values accepted by the XChangeFeedbackControl 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​.
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