Linux Manuals · Linux Manuals session 3 XNoOp (3) Linux Manual Page ByLinux Manual Posted onApr 22, 2026 XNoOp – No Operation Syntaxint XNoOp(Display *display); Argumentsdisplay Specifies the connection to the X server.DescriptionThe XNoOp function sends a NoOperation protocol request to the X server, thereby exercising the connection. See AlsoXlib – C Language X Interface