XNoOp(3X11) XLIB FUNCTIONS XNoOp(3X11)
XNoOp - No Operation
int XNoOp(Display *display);
display Specifies the connection to the X server.
The XNoOp function sends a NoOperation protocol request to the X server, thereby exercising the connection.
Xlib - C Language X Interface XFree86 Version 4.5.0 1