centos man page for xkbqueryextension

XkbQueryExtension(3)						   XKB FUNCTIONS					      XkbQueryExtension(3)

NAME
       XkbQueryExtension -  Determines the compatibility of a library at runtime.

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 mechanism functions ( XQueryExtension and XInitExtension ) for check-
       ing 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: XkbIgnoreExtension, XkbLibraryVersion, and a handful of audible-bell  func-
       tions.  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 compati-
       ble extension is present, XkbQueryExtension returns True; otherwise, it returns 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 determines a compatible version of the X Keyboard Extension is present in
		      the server.

       False	      The XkbQueryExtension function returns False if it determines 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 1.6.0 					      XkbQueryExtension(3)