man pages section 9: DDI and DKI Data Structures
    
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 I/O, block, data transfer structure, — buf ( Index Term Link )
 
 I/O data storage structure using uio, — iovec ( Index Term Link )
 
 I/O request structure, scatter/gather, — uio ( Index Term Link )
 
 iocblk — STREAMS data structure for the M_IOCTL message type ( Index Term Link )