XSetWindowBorderWidth

Syntax

XSetWindowBorderWidth(display, w, width)
      Display *display;
      Window w;
      unsigned int width;

display	Specifies the connection to the X server.
w	Specifies the window.
width	Specifies the width of the window border.

The XSetWindowBorderWidth() function sets the specified window's border width to the specified width.

XSetWindowBorderWidth() can generate a BadWindow error.

BadWindow

A value for a Window argument does not name a defined Window.