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_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, XQueryExtension 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 extension name is not in the Host Portable Character Encoding the result is implementation-dependent.  Uppercase and lowercase mat-
       ter; 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
       Portable  Character  Encoding,  then the returned strings are in the Host Portable Character Encoding. Otherwise, the result is implementa-
       tion-dependent.

       The XFreeExtensionList function frees the memory allocated by XListExtensions.

X Version 11							   libX11 1.6.0 						XQueryExtension(3)