227 lines
3.3 KiB
HTML
227 lines
3.3 KiB
HTML
<HTML
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><HEAD
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>masked_status</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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REL="UP"
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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="status"
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TITLE="msg_status"
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HREF="x285.html"></HEAD
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><TR
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><TH
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COLSPAN="3"
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ALIGN="center"
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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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><TD
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WIDTH="10%"
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ALIGN="left"
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>Prev</A
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></TD
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><TD
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WIDTH="80%"
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ALIGN="center"
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VALIGN="bottom"
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>Chapter 6. The sg_io_hdr_t structure in detail</TD
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><TD
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WIDTH="10%"
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><DIV
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CLASS="SECT1"
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><H1
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CLASS="SECT1"
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><A
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NAME="AEN260">6.15. masked_status</H1
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><P
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> Logically: masked_status == ((status & 0x3e) >> 1) .
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So 'masked_status' strips the vendor information bits off 'status'
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and then shifts it right one position. This makes it easier to do
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things like "if (CHECK_CONDITION == masked_status) ..." using the
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definitions in <scsi/scsi.h>. The defined values in this file are:
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<P
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></P
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><UL
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><LI
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><P
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> GOOD [0x00]</P
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></LI
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><LI
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><P
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> CHECK_CONDITION [0x01]</P
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></LI
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><LI
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><P
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> CONDITION_GOOD [0x02]</P
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></LI
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><LI
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><P
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> BUSY 0x04</P
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></LI
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><LI
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><P
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> INTERMEDIATE_GOOD 0x08</P
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></LI
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><LI
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><P
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> INTERMEDIATE_C_GOOD 0x0a</P
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></LI
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><LI
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><P
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> RESERVATION_CONFLICT 0x0c</P
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></LI
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><LI
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><P
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> COMMAND_TERMINATED 0x11</P
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></LI
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><LI
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><P
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> QUEUE_FULL 0x14</P
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></LI
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></UL
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>
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N.B. 1 bit offset from usual SCSI status values</P
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><P
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> Note that SCSI 3 defines some additional status codes.
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<A
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NAME="AEN283"
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HREF="#FTN.AEN283"
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>[1]</A
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>
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The type of masked_status is unsigned char .</P
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></DIV
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><H3
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CLASS="FOOTNOTES"
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>Notes</H3
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><TABLE
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CLASS="FOOTNOTES"
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WIDTH="100%"
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><TR
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><TD
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ALIGN="LEFT"
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VALIGN="TOP"
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WIDTH="5%"
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><A
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NAME="FTN.AEN283"
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HREF="x260.html#AEN283"
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>[1]</A
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></TD
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><TD
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ALIGN="LEFT"
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VALIGN="TOP"
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WIDTH="95%"
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><P
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>Some lower level drivers (e.g. ide-scsi) clear this masked_status field
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even when a CHECK_CONDITION or COMMAND_TERMINATED status has
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occurred. However they do set DRIVER_SENSE in driver_status field.
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Also a (sb_len_wr > 0) indicates there is a sense buffer.</P
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></TD
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></TR
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></TABLE
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>Prev</A
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>status</TD
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><TD
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WIDTH="34%"
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>msg_status</TD
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> |