Function redwm::imports::query_extension

pub fn query_extension<Conn>(
    conn: &'c Conn, 
    name: &'input [u8]
) -> Result<Cookie<'c, Conn, QueryExtensionReply>, ConnectionError> where
    Conn: RequestConnection + ?Sized, 

check if extension is present.

Determines if the specified extension is present on this X11 server.

Every extension has a unique major_opcode to identify requests, the minor opcodes and request formats are extension-specific. If the extension provides events and errors, the first_event and first_error fields in the reply are set accordingly.

There should rarely be a need to use this request directly, XCB provides the xcb_get_extension_data function instead.

Fields

• name_len - The length of name in bytes.
• name - The name of the extension to query, for example “RANDR”. This is case sensitive!

See

• xdpyinfo: program
• xcb_get_extension_data: function