STAT_CD - Linux

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#define STAT_BUSMASK (STAT_MSG|STAT_CD|STAT_IO)

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#define STAT_COMMAND (STAT_CD) /* Command out */

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#define STAT_STATUS (STAT_CD|STAT_IO) /* Status In */

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#define STAT_MESGOUT (STAT_MSG|STAT_CD) /* Message out */

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#define STAT_MESGIN (STAT_MSG|STAT_CD|STAT_IO) /* Message In */

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if ((stat & (STAT_MSG|STAT_CD)) == 0

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} else if ((stat & STAT_PHASE) == STAT_CD + STAT_IO) {

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&& (stat & (STAT_MSG|STAT_CD)) == 0) {

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if ((stat & STAT_PHASE) != STAT_CD + STAT_IO) {