203 lines
3.6 KiB
HTML
203 lines
3.6 KiB
HTML
<HTML
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><HEAD
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><TITLE
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>info</TITLE
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><META
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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="duration"
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HREF="x361.html"><LINK
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REL="NEXT"
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TITLE="System calls"
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HREF="syscalls.html"></HEAD
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><BODY
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CLASS="SECT1"
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BGCOLOR="#FFFFFF"
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TEXT="#000000"
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LINK="#0000FF"
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VLINK="#840084"
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ALINK="#0000FF"
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><DIV
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CLASS="NAVHEADER"
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><TABLE
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SUMMARY="Header navigation table"
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WIDTH="100%"
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BORDER="0"
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CELLPADDING="0"
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CELLSPACING="0"
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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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VALIGN="bottom"
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><A
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HREF="x361.html"
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ACCESSKEY="P"
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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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ALIGN="right"
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VALIGN="bottom"
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><A
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HREF="syscalls.html"
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ACCESSKEY="N"
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>Next</A
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></TD
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></TR
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></TABLE
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><HR
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ALIGN="LEFT"
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WIDTH="100%"></DIV
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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="AEN364">6.22. info</H1
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><P
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> This value is designed to convey useful information back to the user
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about the associated request. This information does not necessarily
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indicate an error. Several single bit and multi-bit fields are "or-ed"
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together to make this value.</P
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><P
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> A single bit component contained in SG_INFO_OK_MASK indicates whether
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some error or status field is non-zero. If either 'masked_status',
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'host_status' or 'driver_status' are non-zero then SG_INFO_CHECK is
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set. The associated values 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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> SG_INFO_OK_MASK [0x1]</P
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></LI
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><LI
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><P
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> SG_INFO_OK [0x0] no sense, host nor driver "noise"</P
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></LI
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><LI
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><P
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> SG_INFO_CHECK [0x1] something abnormal happened. In most but not all
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cases, the sense buffer will be written. If the sense buffer has
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not been written than 'sb_len_wr' will be zero. This flag indicates
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either 'masked_status', 'host_status' or 'driver_status' is
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non-zero.</P
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></LI
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></UL
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></P
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><P
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> A multi bit component contained in SG_INFO_DIRECT_IO_MASK indicates
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what type of data transfer has just taken place. If indirect IO (or
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no data transfer) has taken place then SG_INFO_INDIRECT_IO is matched.
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Note that even if direct IO was requested in 'flags' the driver may
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choose to do indirect IO instead. If direct IO was requested and
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performed then SG_INFO_DIRECT_IO will be matched. Currently
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SG_INFO_MIXED_IO is never set. The associated values 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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> SG_INFO_DIRECT_IO_MASK [0x6]</P
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></LI
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><LI
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><P
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> SG_INFO_INDIRECT_IO [0x0] data xfer via kernel buffers (or no xfer)</P
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></LI
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><LI
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><P
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> SG_INFO_DIRECT_IO [0x2]</P
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></LI
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><LI
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><P
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> SG_INFO_MIXED_IO [0x4] part direct, part indirect IO</P
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></LI
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></UL
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>
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The type of info is unsigned int .</P
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></DIV
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><DIV
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CLASS="NAVFOOTER"
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><HR
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ALIGN="LEFT"
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WIDTH="100%"><TABLE
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SUMMARY="Footer navigation table"
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CELLSPACING="0"
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><TR
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><TD
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WIDTH="33%"
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ALIGN="left"
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VALIGN="top"
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><A
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HREF="x361.html"
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ACCESSKEY="P"
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>Prev</A
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></TD
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WIDTH="34%"
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VALIGN="top"
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HREF="index.html"
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>Home</A
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WIDTH="33%"
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ALIGN="right"
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VALIGN="top"
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><A
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HREF="syscalls.html"
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ACCESSKEY="N"
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>Next</A
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></TD
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></TR
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><TR
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><TD
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WIDTH="33%"
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ALIGN="left"
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VALIGN="top"
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>duration</TD
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><TD
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WIDTH="34%"
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ALIGN="center"
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VALIGN="top"
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><A
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HREF="sg_io_hdr_t.html"
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>Up</A
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><TD
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WIDTH="33%"
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ALIGN="right"
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VALIGN="top"
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>System calls</TD
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></TR
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></TABLE
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></DIV
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></BODY
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></HTML
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> |