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download PDF document: XkbGetVirtualMods.3.pdf

XkbGetVirtualMods(3) XKB FUNCTIONS XkbGetVirtualMods(3)
NAME XkbGetVirtualMods - Obtain a subset of the virtual modifier bindings (the vmods array) in a keyboard description
SYNOPSIS Status XkbGetVirtualMods (Display *dpy, unsigned int which, XkbDescPtr xkb);
ARGUMENTS dpy connection to server
which mask indicating virtual modifier bindings to get
xkb Xkb description where results will be placed
DESCRIPTION XkbGetVirtualMods sends a request to the server to obtain the vmods entries for the virtual modifiers specified in the mask, which, and waits for a reply.
Virtual modifiers are named by converting their string name to an X Atom and storing the Atom in the names.vmods array in an XkbDescRec structure. The position of a name Atom in the names.vmods array defines the bit position used to represent the virtual modifier and also the index used when accessing virtual modifier information in arrays: the name in the i-th (0 relative) entry of names.vmods is the i-th virtual modifier, represented by the mask (1<<i). Throughout Xkb, various functions have a parameter that is a mask representing virtual modifier choices. In each case, the i-th bit (0 relative) of the mask represents the i-th virtual modifier.
To set the name of a virtual modifier, use XkbSetNames, using XkbVirtualModNamesMask in which and the name in the xkb argument; to retrieve indicator names, use XkbGetNames.
For each bit set in which, XkbGetVirtualMods updates the corresponding virtual modifier definition in the server->vmods array of xkb. The xkb parameter must be a pointer to a valid Xkb keyboard description. If successful, XkbGetVirtualMods returns Success.
Virtual Modifier Names and Masks
Virtual modifiers are named by converting their string name to an X Atom and storing the Atom in the names.vmods array in an XkbDescRec structure. The position of a name Atom in the names.vmods array defines the bit position used to represent the virtual modifier and also the index used when accessing virtual modifier information in arrays: the name in the i-th (0 relative) entry of names.vmods is the i-th virtual modifier, represented by the mask (1<<i). Throughout Xkb, various functions have a parameter that is a mask representing virtual modifier choices. In each case, the i-th bit (0 relative) of the mask represents the i-th virtual modifier.
To set the name of a virtual modifier, use XkbSetNames, using XkbVirtualModNamesMask in which and the name in the xkb argument; to retrieve indicator names, use XkbGetNames.
BadAlloc.
RETURN VALUES Success The XkbGetVirtualMods function returns Success when it successfully updates the corresponding virtual modifier definition in the server->vmods array of xkb.
STRUCTURES The complete description of an Xkb keyboard is given by an XkbDescRec. The component structures in the XkbDescRec represent the major Xkb components.
typedef struct { struct _XDisplay * display; /* connection to X server */ unsigned short flags; /* private to Xkb, do not modify */ unsigned short device_spec; /* device of interest */ KeyCode min_key_code; /* minimum keycode for device */ KeyCode max_key_code; /* maximum keycode for device */ XkbControlsPtr ctrls; /* controls */ XkbServerMapPtr server; /* server keymap */ XkbClientMapPtr map; /* client keymap */ XkbIndicatorPtr indicators; /* indicator map */ XkbNamesPtr names; /* names for all components */ XkbCompatMapPtr compat; /* compatibility map */ XkbGeometryPtr geom; /* physical geometry of keyboard */ } XkbDescRec, *XkbDescPtr;
The display field points to an X display structure. The flags field is private to the library: modifying flags may yield unpredictable results. The device_spec field specifies the device identifier of the keyboard input device, or XkbUseCoreKeyboard, which specifies the core keyboard device. The min_key_code and max_key_code fields specify the least and greatest keycode that can be returned by the keyboard.
Each structure component has a corresponding mask bit that is used in function calls to indicate that the structure should be manipulated in some manner, such as allocating it or freeing it. These masks and their relationships to the fields in the XkbDescRec are shown in Table 1.

Table 1 Mask Bits for XkbDescRec -------------------------------------------------- Mask Bit XkbDescRec Field Value -------------------------------------------------- XkbControlsMask ctrls (1L<<0) XkbServerMapMask server (1L<<1) XkbIClientMapMask map (1L<<2) XkbIndicatorMapMask indicators (1L<<3) XkbNamesMask names (1L<<4) XkbCompatMapMask compat (1L<<5) XkbGeometryMask geom (1L<<6) XkbAllComponentsMask All Fields (0x7f)
DIAGNOSTICS BadAlloc Unable to allocate storage
BadMatch A compatible version of Xkb was not available in the server or an argument has correct type and range, but is otherwise invalid