XSetBackground

Syntax

XSetBackground(display, gc, background)
      Display *display;
      GC gc;
      unsigned long background;

display	Specifies the connection to the X server.
gc	Specifies the GC.
background	Specifies the background you want to set for the specified GC.

XSetBackground() can generate BadAlloc and BadGC errors.

BadAlloc	The server failed to allocate the requested source or server memory.
BadGC	A value for a GContext argument does not name a defined GContext.