XkbQueryExtension(3) XKB FUNCTIONS XkbQueryExtension(3)
NAME
XkbQueryExtension - Determines the compatibility of a library at run-
time.
SYNOPSIS
Bool XkbQueryExtension (Display *dpy, int *opcode_rtrn, int *event_rtrn,
int *error_rtrn, int *major_in_out, int *minor_in_out);
ARGUMENTS
dpy connection to the X server
opcode_rtrn
backfilled with the major extension opcode
event_rtrn
backfilled with the extension base event code
error_rtrn
backfilled with the extension base error code
major_in_out
compile time lib major version in, server major version out
minor_in_out
compile time lib min version in, server minor version out
DESCRIPTION
Call XkbQueryExtension to check for the presence and compatibility of
the extension in the server and to initialize the extension. Because of
potential version mismatches, you cannot use the generic extension mech-
anism functions ( XQueryExtension and XInitExtension ) for checking for
the presence of, and initializing the Xkb extension.
You must call XkbQueryExtension or XkbOpenDisplay before using any other
Xkb library interfaces, unless such usage is explicitly allowed in the
interface description in this document. The exceptions are: XkbIgnoreEx-
tension, XkbLibraryVersion, and a handful of audible-bell functions. You
should not use any other Xkb functions if the extension is not present
or is uninitialized. In general, calls to Xkb library functions made
prior to initializing the Xkb extension cause BadAccess protocol errors.
XkbQueryExtension both determines whether a compatible Xkb extension is
present in the X server and initializes the extension when it is
present.
The XkbQueryExtension function determines whether a compatible version
of the X Keyboard Extension is present in the server. If a compatible
extension is present, XkbQueryExtension returns True; otherwise, it re-
turns False.
If a compatible version of Xkb is present, XkbQueryExtension initializes
the extension. It backfills the major opcode for the keyboard extension
in opcode_rtrn, the base event code in event_rtrn, the base error code
in error_rtrn, and the major and minor version numbers of the extension
in major_in_out and minor_in_out. The major opcode is reported in the
req_major fields of some Xkb events. For a discussion of the base event
code.
RETURN VALUES
True The XkbQueryExtension function returns True if it deter-
mines a compatible version of the X Keyboard Extension is
present in the server.
False The XkbQueryExtension function returns False if it deter-
mines a compatible version of the X Keyboard Extension is
not present in the server.
SEE ALSO
XkbIgnoreExtension(3), XkbLibraryVersion(3), XkbOpenDisplay(3)
X Version 11 libX11 1.8.12 XkbQueryExtension(3)
Generated by dwww version 1.16 on Sat Oct 3 03:31:58 CEST 2026.