XkbQueryExtension man page on Peanut

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XkbQueryExtension(3)		 XKB FUNCTIONS		  XkbQueryExtension(3)

NAME
       XkbQueryExtension  -  Determines the compatibility of a library at run‐
       time.

SYNOPSIS
       Bool XkbQueryExtension  (  dpy,	opcode_rtrn,  event_rtrn,  error_rtrn,
       major_in_out, minor_in_out )
	     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 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:
       XkbIgnoreExtension, 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
       returns False.

       If  a  compatible version of Xkb is present, XkbQueryExtension initial‐
       izes 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
		      determines a compatible version of the X Keyboard Exten‐
		      sion is not present in the server.

SEE ALSO
       XkbIgnoreExtension(3), XkbLibraryVersion(3), XkbOpenDisplay(3)

X Version 11			  libX11 1.2		  XkbQueryExtension(3)
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