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const
  {$EXTERNALSYM IOCPARM_MASK}
  IOCPARM_MASK = $7F;
  {$EXTERNALSYM IOC_VOID}
  IOC_VOID     = $20000000;
  {$EXTERNALSYM IOC_OUT}
  IOC_OUT      = $40000000;
  {$EXTERNALSYM IOC_IN}
  IOC_IN       = $80000000;
  {$EXTERNALSYM IOC_INOUT}
  IOC_INOUT    = (IOC_IN or IOC_OUT);

...

  {$EXTERNALSYM timeval}
  timeval = record
    tv_sec: Longint;
    tv_usec: Longint;
  end;
  TTimeVal = timeval;
  PTimeVal = ^TTimeVal;