Manpages - XGetExtensionVersion.3

XGetExtensionVersion - query the version of the input extension.

  #include <X11/extensions/XInput.h>

  XExtensionVersion *XGetExtensionVersion( Display *display,
                                           char *name);

  display
         Specifies the connection to the X server.

  name
         Specifies the extension to be queried. The input
         extension name is defined in the header file XI.h.

    The XGetExtensionVersion request is deprecated and should not
    be used in XI2 applications. Clients issuing a XGetExtensionVersion
    request will not be able to use XI2 features.

    The XGetExtensionVersion request queries the version of the input
    extension, and returns an XExtensionVersion structure. This structure
    contains a major_version and minor_version number which can be compared
    with constants defined in XI.h. Support for additional protocol
    requests added to the input extension after its initial release
    is indicated by a version number corresponding to the added
    requests. Each version contains all the protocol requests
    contained by previous versions.

    You should use XFree to free the XExtensionVersion structure.

    This request returns an XExtensionVersion structure.

    typedef struct {
        int present;
        short major_version;
        short minor_version;
    } XExtensionVersion;