153 lines
2.4 KiB
HTML
153 lines
2.4 KiB
HTML
<HTML
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><HEAD
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><TITLE
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>pack_id</TITLE
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NAME="GENERATOR"
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CONTENT="Modular DocBook HTML Stylesheet Version 1.76b+
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"><LINK
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REL="HOME"
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TITLE="The Linux SCSI Generic (sg) HOWTO"
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HREF="index.html"><LINK
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TITLE="The sg_io_hdr_t structure in detail"
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HREF="sg_io_hdr_t.html"><LINK
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REL="PREVIOUS"
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TITLE="flags"
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TITLE="usr_ptr"
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HREF="x252.html"></HEAD
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>The Linux SCSI Generic (sg) HOWTO</TH
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></TR
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><TR
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>Chapter 6. The sg_io_hdr_t structure in detail</TD
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><A
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NAME="AEN249">6.12. pack_id</H1
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><P
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> This value is not normally acted upon by the sg driver. It is provided
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so the user can identify the request. This is useful when command queuing
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is being used.
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The "abnormal" case is when SG_SET_FORCE_PACK_ID is set and a 'pack_id'
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other than -1 is given to read(). In this case the read() will wait
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to fetch a request that matches this 'pack_id'. If this mode is used
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be careful to set 'dxfer_direction' to a valid value (actually any of
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the SG_DXFER_* values will do) on input to the read(), together with
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the wanted pack_id.
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The type of pack_id is int.</P
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>flags</TD
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>usr_ptr</TD
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> |