Table of Contents


XF86MiscQueryExtension, XF86MiscQueryVersion, XF86MiscGetMouseSettings, XF86MiscSetMouseSettings, XF86MiscGetKbdSettings, XF86MiscSetKbdSettings - Extension library for the XFree86-Misc X extension.


#include <X11/extensions/xf86misc.h>

Bool XF86MiscQueryExtension(
    Display *display,
    int *event_base_return,
    int *error_base_return);

Bool XF86MiscQueryVersion(
    Display *display,
    int *major_version_return,
    int *minor_version_return);

Status XF86MiscGetMouseSettings(
    Display *display,
    XF86MiscMouseSettings *mseinfo);

Status XF86MiscSetMouseSettings(
    Display *display,
    XF86MiscMouseSettings *mseinfo);

Status XF86MiscGetKbdSettings(
    Display *display,
    XF86MiscKbdSettings *kbdinfo);

Status XF86MiscSetKbdSettings(
    Display *display,
    XF86MiscKbdSettings *kbdinfo);


Specifies the connection to the X server.
Specifies which screen number the setting apply to.
Returns the base event number for the extension.
Returns the base error number for the extension.
Returns the major version number of the extension.
Returns the minor version number of the extension.
Specifies a structure which contains the mouse parameters.
Specifies a structure which contains the keyboard parameters.


typedef struct {
    char *device;     /* returned path to device */
    int type;    /* mouse protocol */
    int baudrate;    /* 1200, 2400, 4800, or 9600 */
    int samplerate;    /* samples per second */
    int resolution;    /* resolution, count per inch */
    int buttons;    /* number of buttons */
    Bool emulate3buttons;    /* Button1+Button3 -> Button2 ? */
    int emulate3timeout;    /* in milliseconds */
    Bool chordmiddle;    /* Button1+Button3 == Button2 ? */
    int flags;    /* Device open flags */
} XF86MiscMouseSettings;
typedef struct {
    int type;    /* of keyboard: 84-key, 101-key, Xqueue  */
    int rate;    /* repeat rate */
    int delay;    /* delay until repeat starts */
    Bool servnumlock;    /* Server handles NumLock ? */
} XF86MiscKbdSettings;


These functions provide an interface to the XFree86-Misc extension which allows various server settings to be queried and changed dynamically. Applications that use these functions must be linked with -lXxf86misc

Power-saver Functions

The XF86MiscGetSaver and XF86MiscSetSaver functions have been removed. This functionality is now provided by the DPMS extension.

Mouse Functions

Mouse parameters can be queried using the function XF86MiscGetMouseSettings. The structure pointed to by its second argument is filled in with the current mouse settings.

Not all fields are valid in all cases. For example, when the protocol indicates a bus mouse (i.e. the type field has value MTYPE_BUSMOUSE as defined in xf86misc.h), then the value in the baudrate field should be ignored as it does not apply to bus mice.

The samplerate field contains the resolution in lines per inch when using the Hitachi tablet protocol.

The device field of the structure points to dynamically allocated storage which should be freed by the caller.

Any of the fields of the structure can be altered and then passed to the XF86MiscSetMouseSettings function to change their value in the server, with the following restrictions:

  1. The device can not be changed
  2. The protocol can not be changed to or from Xqueue or OsMouse
  3. The buttons field can not be changed
Invalid combinations of parameters are not allowed

The server will generate an error if any of the above is attempted, except the first - the contents of the device field are simply ignored.

A change of the protocol causes the device to be closed and reopened. Changes to the baud rate, sample rate, resolution or flags, when applicable to the selected protocol, also cause a reopen of the device. A reopen can be forced by using the MF_REOPEN flag, except in the case of the OsMouse and Xqueue protocols which ignore all attempts to reopen the device.

Keyboard Functions

The XF86MiscGetKbdSettings function allows you to retrieve the current keyboard-related settings from the server.

Using the XF86MiscSetKbdSettings function, the keyboard autorepeat delay and rate can be set. Requests to change the type and servnumlock fields are ignored (except for checking for an invalid keyboard type). This is expected to change in a future release.

Other Functions

Two functions, XF86MiscQueryExtension and XF86MiscQueryVersion, are provided which allow the client to query some information regarding the extension itself.

Predefined Values

The header file X11/extensions/xf86misc.h contains definitions for
Mouse protocols
Keyboard types
Mouse flags

See Also

xset(1x) , xorg.conf(5x)


Joe Moss and David Dawes, The XFree86 Project, Inc.

Table of Contents