MC_HAS_POSIX
MC_HAS_POSIX;
case MC_HAS_POSIX:
((struct iocblk *)mp->b_rptr)->ioc_cmd = MC_HAS_POSIX;
((struct iocblk *)mp->b_rptr)->ioc_cmd = MC_HAS_POSIX;
((struct iocblk *)mp->b_rptr)->ioc_cmd = MC_HAS_POSIX;