SVR5 and SCO OpenServer 5

M_IOCACK(D7str)

M_IOCACK, M_IOCNAK -- signal acknowledgement of M_IOCTL message

Description

M_IOCACK signals the positive acknowledgment of a previous M_IOCTL(D7str) message. The message may contain information sent by the receiving module or driver. The Stream head returns the information to the user if there is a corresponding outstanding M_IOCTL request.

M_IOCNAK signals the negative acknowledgment (failure) of a previous M_IOCTL message. When the Stream head receives an M_IOCNAK, the outstanding ioctl request, if any, will fail. See M_IOCTL(D7str) for more information about the format and usage of these message types.

Message type

Priority.

Version applicability

ddi: 1, 2, 3, 4, 5, 5mp, 6, 6mp, 7, 7mp, 7.1, 7.1mp, 8, 8mp
oddi: 1, 2, 2mp, 3, 3mp, 4, 4mp, 5, 5mp

References

M_IOCTL(D7str), streamio