Manual Pages for UNIX Operating System command usage for man XQueryExtension

X FUNCTIONS                                 XQueryExtension(3x11)



NAME
     XQueryExtension, XListExtensions, XFreeExtensionList -  list
     available extensions

SYNTAX
     cc [ flag... ] file... -lX11 [ library... ]

     Bool  XQueryExtension(display,  name,   major_opcode_return,
          first_event_return, first_error_return)

     char **XListExtensions(display, nextensions_return)

     XFreeExtensionList(list)

ARGUMENTS
     display   Specifies the connection to the X server.

     name      Specifies the extension name.

     major_opcode_return
               Returns the major opcode.

     first_event_return
               Returns the first event code, if any.

     first_error_return
               Returns the first error code, if any.

     nextensions_return
               Returns the number of extensions listed.

     list      Specifies the list of extension names.

DESCRIPTION
     The XQueryExtension function determines if the named  exten-
     sion is present.  If the extension is not present, XQueryEx-
     tension returns False; otherwise, it returns True.   If  the
     extension  is  present,  XQueryExtension  returns  the major
     opcode for the extension to major_opcode_return;  otherwise,
     it  returns  zero.  Any minor opcode and the request formats
     are specific to the extension.  If  the  extension  involves
     additional  event  types,  XQueryExtension  returns the base
     event type code to first_event_return; otherwise, it returns
     zero. The format of the events is specific to the extension.
     If the extension involves additional error codes,  XQueryEx-
     tension  returns  the base error code to first_error_return;
     otherwise, it returns zero.  The format of  additional  data
     in  the  errors is specific to the extension.  If the exten-
     sion name is not in the Host Portable Character Encoding the
     result is implementation-dependent.  Uppercase and lowercase
     matter; the strings ``thing'', ``Thing'', and ``thinG''  are
     all considered different names.



X Version 11        Last change: libX11 1.3.5                   1






X FUNCTIONS                                 XQueryExtension(3x11)



     The XListExtensions function returns a list  of  all  exten-
     sions  supported  by the server. If the data returned by the
     server is in the Latin Portable Character Encoding, then the
     returned  strings  are in the Host Portable Character Encod-
     ing. Otherwise, the result is implementation-dependent.

     The XFreeExtensionList function frees the  memory  allocated
     by XListExtensions.


ATTRIBUTES
     See attributes(5) for descriptions of the  following  attri-
     butes:

     ____________________________________________________________
    |       ATTRIBUTE TYPE        |       ATTRIBUTE VALUE       |
    |_____________________________|_____________________________|
    | Availability                | x11/library/libx11          |
    |_____________________________|_____________________________|
    | Interface Stability         | Committed                   |
    |_____________________________|_____________________________|
    | MT-Level                    | See XInitThreads(3X11)      |
    |_____________________________|_____________________________|
































X Version 11        Last change: libX11 1.3.5                   2