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XQueryExtension(3)		  X FUNCTIONS		    XQueryExtension(3)

NAME
       XQueryExtension,	 XListExtensions,  XFreeExtensionList -	list available
       extensions

SYNTAX
       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 extension is
       present.	 If the	extension  is  not  present,  XQueryExtension  returns
       False;  otherwise,  it  returns	True.	If  the	 extension is present,
       XQueryExtension returns the major opcode	for the	extension to major_op-
       code_return;  otherwise,	it returns zero.  Any minor opcode and the re-
       quest 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 ad-
       ditional	error codes, XQueryExtension returns the base  error  code  to
       first_error_return;  otherwise,	it  returns zero.  The format of addi-
       tional 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.

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

       The  XFreeExtensionList function	frees the memory allocated by XListEx-
       tensions.

X Version 11			 libX11	1.6.5		    XQueryExtension(3)

NAME | SYNTAX | ARGUMENTS | DESCRIPTION

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