Function Socket.setSockOpt

void setSockOpt (
  int level,
  int optname,
  const(void)[] optval,
  string msg = "setsockopt failed"
) @nogc;

void setSockOpt(T) (
  int level,
  int optname,
  auto ref const(T) optval,
  string msg = "setsockopt failed"
) @nogc;