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2) Use CURSIG(curproc) in PROCESS_ABORTING instead of junk code was there. 3) Reanimate timeout code in DO_SLEEP by setting WK_TIMEOUT flag which is never set in old code. 4) DO_SLEEP: set aborting flag on interrupting singnals as supposed, not on signals which do nothing as in old code. 5) Cleanup WAKE_UP macro, WK_WAKEUP not used. 6) Remove wrong typecasts in sleep/wakeup code.