xkbopendisplay(3) [centos man page]

XkbOpenDisplay(3)						   XKB FUNCTIONS						 XkbOpenDisplay(3)

NAME

       XkbOpenDisplay  -   Checks  for a compatible version of the Xkb extension in both the library and the server, and initializes the extension
       for use.

SYNOPSIS

       Display XkbOpenDisplay (char *display_name, int *event_rtrn, int *error_rtrn, int *major_in_out, int *minor_in_out, int *reason_rtrn);

ARGUMENTS

       display_name
	      hardware display name, which determines the display and communications domain to be used

       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

       reason_rtrn
	      backfilled with a status code

DESCRIPTION

       As a convenience, you can use the function XkbOpenDisplay to perform these three tasks at once: open a connection to an X server, check for
       a compatible version of the Xkb extension in both the library and the server, and initialize the extension for use.

       XkbOpenDisplay  is  a  convenience function that opens an X display connection and initializes the X keyboard extension. In all cases, upon
       return reason_rtrn contains a status value indicating success or the type of failure.  If  major_in_out	and  minor_in_out  are	not  NULL,
       XkbOpenDisplay  first  calls  XkbLibraryVersion	to determine whether the client library is compatible, passing it the values pointed to by
       major_in_out and minor_in_out. If the library is incompatible, XkbOpenDisplay backfills major_in_out and minor_in_out with  the	major  and
       minor  extension versions of the library being used and returns NULL.  If the library is compatible, XkbOpenDisplay next calls XOpenDisplay
       with the display_name.  If this fails, the function returns NULL. If successful, XkbOpenDisplay calls XkbQueryExtension and  backfills  the
       major  and  minor  Xkb server extension version numbers in major_in_out and minor_in_out. If the server extension version is not compatible
       with the library extension version or if the server extension is not present, XkbOpenDisplay closes the display and returns NULL. When suc-
       cessful, the function returns the display connection.

       The possible values for reason_rtrn are:

       o    XkbOD_BadLibraryVersion indicates XkbLibraryVersion returned False.

       o    XkbOD_ConnectionRefused indicates the display could not be opened.

       o    XkbOD_BadServerVersion indicates the library and the server have incompatible extension versions.

       o    XkbOD_NonXkbServer indicates the extension is not present in the X server.

       o    XkbOD_Success indicates that the function succeeded.

RETURN VALUES

       NULL	      The XkbOpenDisplay function returns NULL if the library is incompatible.

		    The XkbOpenDisplay function returns NULL if the call to XOpenDisplay with the display_name fails.

		    The  XkbOpenDisplay  function  returns  NULL and closes the display if the server extension version is not compatible with the
		    library extension version or if the server extension is not present.

DIAGNOSTICS

       BadAccess      The Xkb extension has not been properly initialized

SEE ALSO

       XkbLibraryVersion(3), XkbQueryExtension(3), XOpenDisplay(3)

X Version 11							   libX11 1.6.0 						 XkbOpenDisplay(3)

Check Out this Related Man Page

XkbLibraryVersion(3)						   XKB FUNCTIONS					      XkbLibraryVersion(3)

NAME

       XkbLibraryVersion -  Determines the compatibility of a library at runtime.

SYNOPSIS

       Bool XkbLibraryVersion (int *lib_major_in_out, int *lib_minor_in_out);

ARGUMENTS

       lib_major_in_out
	      Specifies and returns the major Xkb library version.

       lib_minor_in_out
	      Specifies and returns the minor Xkb library version.

DESCRIPTION

       If  an  application  is dynamically linked, both the X server and the client-side X library must contain the Xkb extension in order for the
       client to use the Xkb extension capabilities. Therefore a dynamically linked application must check both the library  and  the  server  for
       compatibility  before  using  Xkb  function  calls.  A properly written program must check for compatibility between the version of the Xkb
       library that is dynamically loaded and the one used when the application was built. It must then check the server version for compatibility
       with the version of Xkb in the library.

       If  your application is statically linked, you must still check for server compatibility and may check library compatibility. (It is possi-
       ble to compile against one set of header files and link against a different, incompatible, version of the library, although this should not
       normally occur.)

       Pass the symbolic value XkbMajorVersion in lib_major_in_out and XkbMinorVersion in lib_minor_in_out.  These arguments represent the version
       of the library used at compile time. The XkbLibraryVersion function backfills the major and minor version numbers of the  library  used	at
       run  time  in  lib_major_in_out	and  lib_minor_in_out.	 If the versions of the compile time and run time libraries are compatible, XkbLi-
       braryVersion returns True, otherwise, it returns False.

       In addition, in order to use the Xkb extension, you must ensure that the extension is present in the server and that  the  server  supports
       the version of the extension expected by the client. Use XkbQueryExtension to do this, as described in the next section.

RETURN VALUES

       True	      The XkbLibraryVersion returns True if the versions of the compile time and run time libraries are compatible.

       False	      The XkbLibraryVersion returns False if the versions of the compile time and run time libraries are not compatible.

SEE ALSO

       XkbMajorVersion(3), XkbMinorVersion(3), XkbQueryExtension(3)

X Version 11							   libX11 1.5.0 					      XkbLibraryVersion(3)

Linux and UNIX Man Pages

xkbopendisplay(3) [centos man page]

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