FP_THEAD
#define FP_NHEAD1(x, y) FP_THEAD(port, FP_BUF_LEVEL_##x, y)
#define FP_NHEAD2(x, y) FP_THEAD(port, FP_MSG_BUF_LEVEL_##x, y)
#define FP_NHEAD3(x, y) FP_THEAD(port, FP_MSG_BUF_CONSOLE_LEVEL_##x, y)