185 lines
2.8 KiB
HTML
185 lines
2.8 KiB
HTML
<HTML
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>dxfer_len</TITLE
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>Chapter 6. The sg_io_hdr_t structure in detail</TD
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NAME="AEN198">6.6. dxfer_len</H1
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> This is the number of bytes to be moved in the data transfer
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associated with the command. The direction of the transfer is indicated
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by 'dxfer_direction'. If 'dxfer_len' is zero then no data transfer
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takes place.
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<A
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NAME="AEN201"
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HREF="#FTN.AEN201"
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>[1]</A
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></P
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><P
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> If iovec_count is non-zero then 'dxfer_len' should be equal to the sum
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of iov_len lengths. If not, the minimum of the two is the transfer length.
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The type of dxfer_len is unsigned int.</P
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>Notes</H3
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>Some HBA - SCSI device combinations have difficulties with an odd valued
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dxfer_len . In some cases the operation succeeds but a DID_ERROR host status
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is returned. So unless there is a good reason, applications that want
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maximum portability should avoid an odd valued dxfer_len .</P
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>iovec_count</TD
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