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download PDF document: XGetDeviceModifierMapping.3.pdf

XGETDEVICEMODIFIERMA(3) XGETDEVICEMODIFIERMA(3)
NAME XGetDeviceModifierMapping, XSetDeviceModifierMapping - query or change device modifier mappings
SYNOPSIS #include <X11/extensions/XInput.h>
int XSetDeviceModifierMapping( Display *display, XDevice *device, XModifierKeymap *modmap);
XModifierKeymap *XGetDeviceModifierMapping( Display *display, XDevice *device);
display Specifies the connection to the X server.
device Specifies the device whose modifier mapping is to be queried or modified.
modmap Specifies a pointer to the XModifierKeymap structure.
DESCRIPTION The XSetDeviceModifierMapping request specifies the KeyCodes of the keys (if any) that are to be used as modifiers for the specified device. If it succeeds, the X server generates a DeviceMappingNotify event, and XSetDeviceModifierMapping returns MappingSuccess. X permits at most eight modifier keys. If more than eight are specified in the XModifierKeymap structure, a BadLength error results.
The modifiermap member of the XModifierKeymap structure contains eight sets of max_keypermod KeyCodes, one for each modifier in the order Shift, Lock, Control, Mod1, Mod2, Mod3, Mod4, and Mod5. Only nonzero KeyCodes have meaning in each set, and zero KeyCodes are ignored. In addition, all of the nonzero KeyCodes must be in the range specified by min_keycode and max_keycode as returned by XListInputDevices, or a BadValue error results. No KeyCode may appear twice in the entire map, or a BadValue error results.
An X server can impose restrictions on how modifiers can be changed, for example, if certain keys do not generate up transitions in hardware, if auto-repeat cannot be disabled on certain keys, or if multiple modifier keys are not supported. If some such restriction is violated, the status reply is MappingFailed, and none of the modifiers are changed. If the new KeyCodes specified for a modifier differ from those currently defined and any (current or new) keys for that modifier are in the logically down state, XSetDeviceModifierMapping returns MappingBusy, and none of the modifiers is changed.
XSetDeviceModifierMapping can generate BadLength, BadDevice, BadMatch, BadAlloc, and BadValue errors. XGetDeviceModifierMapping can generate BadDevice and BadMatch errors.
Structures
The XModifierKeymap structure contains:
typedef struct { int max_keypermod; KeyCode *modifiermap; } XModifierKeymap;
DIAGNOSTICS BadLength More than eight keys were specified in the XModifierKeymap structure.
BadAlloc The server failed to allocate the requested resource or server memory.
BadDevice 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 the specified device is the X keyboard or X pointer device.
BadMatch This error may occur if an XGetDeviceModifierMapping or XChangeDeviceModifierMapping request was made specifying a device that has no keys.
BadValue Some numeric value falls outside the range of values accepted by the 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.
SEE ALSO XSetDeviceKeyMapping(3), XSetDeviceButtonMapping(3)
09/15/2021 XGETDEVICEMODIFIERMA(3)