MDBIOC - Illumos

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#define MDB_IOC_CTTY (MDBIOC | 0x01) /* Clear child tty settings */

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#define MDB_IOC_TSET (MDBIOC | 0x02) /* Set terminal type */

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#define MDB_IOC_GETFD (MDBIOC | 0x04) /* Get file descriptor (if any) */