XkbAllocDeviceInfo(3) XKB FUNCTIONS XkbAllocDeviceInfo(3)

# [NAME](#NAME)

XkbAllocDeviceInfo - Obtain an XkbDeviceInfoRec structure

# [SYNOPSIS](#SYNOPSIS)

**XkbDeviceInfoPtr XkbAllocDeviceInfo** **(unsigned int device\_spec,** **unsigned int n\_buttons,** **unsigned int sz\_leds);**

# [ARGUMENTS](#ARGUMENTS)

[*device\_spec*](#device_spec)

device ID with which structure will be used

[*n\_buttons*](#n_buttons)

number of button actions to allocate space for

[*sz\_leds*](#sz_leds)

number of LED feedbacks to allocate space for

# [DESCRIPTION](#DESCRIPTION)

*XkbAllocDeviceInfo* allocates space for an XkbDeviceInfoRec structure and initializes that structure's *device\_spec* field with the device ID specified by *device\_spec.* If *n\_buttons* is nonzero, *n\_buttons* XkbActions are linked into the XkbDeviceInfoRec structure and initialized to zero. If *sz\_leds* is nonzero, *sz\_leds* XkbDeviceLedInfoRec structures are also allocated and linked into the XkbDeviceInfoRec structure. If you request XkbDeviceLedInfoRec structures be allocated using this request, you must initialize them explicitly, by using [**XkbAddDeviceLedInfo**(3)](/man/os/libx11/XkbAddDeviceLedInfo.3).

# [STRUCTURES](#STRUCTURES)

Information about X Input Extension devices is transferred between a client program and the Xkb extension in an XkbDeviceInfoRec structure:

```


    typedef struct {


        char *               name;          /* name for device */


        Atom                 type;          /* name for class of devices */


        unsigned short       device_spec;   /* device of interest */


        Bool                 has_own_state; /* True=>this device has its own state */


        unsigned short       supported;     /* bits indicating supported capabilities */


        unsigned short       unsupported;   /* bits indicating unsupported capabilities */


        unsigned short       num_btns;      /* number of entries in btn_acts */


        XkbAction *          btn_acts;      /* button actions */


        unsigned short       sz_leds;       /* total number of entries in LEDs vector */


        unsigned short       num_leds;      /* number of valid entries in LEDs vector */


        unsigned short       dflt_kbd_fb;   /* input extension ID of default (core kbd) indicator */


        unsigned short       dflt_led_fb;   /* input extension ID of default indicator feedback */


        XkbDeviceLedInfoPtr  leds;          /* LED descriptions */


    } XkbDeviceInfoRec, *XkbDeviceInfoPtr;


    typedef struct {


        unsigned short      led_class;        /* class for this LED device*/


        unsigned short      led_id;           /* ID for this LED device */


        unsigned int        phys_indicators;  /* bits for which LEDs physically present */


        unsigned int        maps_present;     /* bits for which LEDs have maps in maps */


        unsigned int        names_present;    /* bits for which LEDs are in names */


        unsigned int        state;            /* 1 bit => corresponding LED is on */


        Atom                names[XkbNumIndicators];   /* names for LEDs */


        XkbIndicatorMapRec  maps;             /* indicator maps for each LED */


    } XkbDeviceLedInfoRec, *XkbDeviceLedInfoPtr;
```

# [SEE ALSO](#SEE_ALSO)

[**XkbAddDeviceLedInfo**(3)](/man/os/libx11/XkbAddDeviceLedInfo.3)

libX11 1.8.14 X Version 11

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Document: XkbAllocDeviceInfo(3) from libx11 1.8.14-r0 (Chainguard OS)
Source: https://gitlab.freedesktop.org/xorg/lib/libx11.git