The Linux SCSI Generic (sg) HOWTO
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# 6.16. msg_status

The messaging level in SCSI is under the command level and knowledge of what is happening at the messaging level is very rarely needed. Furthermore most modern chip-sets used in SCSI adapters completely hide this value. Nearly all adapters will return zero in 'msg_status' all the time. The type of msg_status is unsigned char .

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