tsleep
void tsleep(void);
tsleep();
tsleep();
tsleep(&acpiecnowait, PWAIT, "acpiec", 1);
tsleep(curproc, PWAIT, "schtou", timeout);
err = tsleep(curproc, intr ? PCATCH : 0, "dfwat", ret);
tsleep(dwork, PWAIT, "fldwto", 1);
tsleep(tp, TTIPRI | PCATCH, "ttyretype", 1) == EINTR)
int tsleep(const volatile void *, int, const char *, int);