FMD_CTL_CLASS
#define FMD_CTL_CLASS_LEN (sizeof (FMD_CTL_CLASS) - 1)
#define FMD_CTL_ADDHRT FMD_CTL_CLASS "clock.addhrtime"
isproto = (strncmp(class, FMD_CTL_CLASS, FMD_CTL_CLASS_LEN) == 0) ?