/usr/share/doc/discover/guide.html

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>The Discover Hardware Detection System</TITLE
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><DIV
CLASS="BOOK"
><A
NAME="AEN1"
></A
><DIV
CLASS="TITLEPAGE"
><H1
CLASS="title"
><A
NAME="AEN2"
>The <SPAN
CLASS="application"
>Discover</SPAN
> Hardware Detection System</A
></H1
><H3
CLASS="author"
><A
NAME="AEN5"
></A
>G. Branden Robinson</H3
><H3
CLASS="author"
><A
NAME="AEN9"
></A
>John R. Daily</H3
><P
CLASS="copyright"
>Copyright &copy; 2002 Progeny Linux Systems, Inc.</P
><P
CLASS="copyright"
>Copyright &copy; 2002 Hewlett-Packard Company</P
><DIV
CLASS="legalnotice"
><P
></P
><A
NAME="AEN22"
></A
><P
>Permission is hereby granted, free of charge, to any
    person obtaining a copy of this software and associated
    documentation files (the "Software"), to deal in
    the Software without restriction, including without
    limitation the rights to use, copy, modify, merge, publish,
    distribute, sublicense, and/or sell copies of the Software,
    and to permit persons to whom the Software is furnished to
    do so, subject to the following conditions:</P
><P
>The above copyright notice and this permission notice
    shall be included in all copies or substantial portions of
    the Software.</P
><P
>THE SOFTWARE IS PROVIDED "AS IS", WITHOUT
    WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT
    LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
    PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
    THE COPYRIGHT HOLDER(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
    OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
    OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
    SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
    SOFTWARE.</P
><P
></P
></DIV
><DIV
CLASS="legalnotice"
><P
></P
><A
NAME="AEN26"
></A
><P
>Linux is a registered trademark of Linus Torvalds.</P
><P
></P
></DIV
><SPAN
CLASS="releaseinfo"
>$Progeny$<BR></SPAN
><HR></DIV
><DIV
CLASS="TOC"
><DL
><DT
><B
>Table of Contents</B
></DT
><DT
><A
HREF="#pr-what_is_discover"
>What Is <SPAN
CLASS="application"
>Discover</SPAN
>?</A
></DT
><DT
>I. <A
HREF="#pt-data_structure"
>Data Structure</A
></DT
><DD
><DL
><DT
>1. <A
HREF="#ch-overview_discover_data_format"
>Overview of
      the <SPAN
CLASS="application"
>Discover</SPAN
> Data Format</A
></DT
><DT
>2. <A
HREF="#ch-master_list"
>Master List</A
></DT
><DT
>3. <A
HREF="#ch-busclass_lists"
>Busclass Lists</A
></DT
><DD
><DL
><DT
>3.1. <A
HREF="#sc-busclass_list_element"
>The
        <CODE
CLASS="sgmltag"
>busclass_list</CODE
> element</A
></DT
><DD
><DL
><DT
>3.1.1. <A
HREF="#sc-busclass_list_element_bus_attribute"
>The
          <CODE
CLASS="sgmltag"
>bus</CODE
> attribute</A
></DT
></DL
></DD
><DT
>3.2. <A
HREF="#sc-busclass_element"
>The
        <CODE
CLASS="sgmltag"
>busclass</CODE
> element</A
></DT
><DD
><DL
><DT
>3.2.1. <A
HREF="#sc-busclass_element_id_attribute"
>The
          <CODE
CLASS="sgmltag"
>id</CODE
> attribute</A
></DT
><DT
>3.2.2. <A
HREF="#sc-busclass_element_name_attribute"
>The
          <CODE
CLASS="sgmltag"
>name</CODE
> attribute</A
></DT
></DL
></DD
></DL
></DD
><DT
>4. <A
HREF="#ch-vendor_lists"
>Vendor Lists</A
></DT
><DD
><DL
><DT
>4.1. <A
HREF="#sc-vendor_list_element"
>The
        <CODE
CLASS="sgmltag"
>vendor_list</CODE
> element</A
></DT
><DD
><DL
><DT
>4.1.1. <A
HREF="#sc-vendor_list_element_bus_attribute"
>The
          <CODE
CLASS="sgmltag"
>bus</CODE
> attribute</A
></DT
></DL
></DD
><DT
>4.2. <A
HREF="#sc-vendor_element"
>The <CODE
CLASS="sgmltag"
>vendor</CODE
> element</A
></DT
><DD
><DL
><DT
>4.2.1. <A
HREF="#sc-vendor_element_id_attribute"
>The <CODE
CLASS="sgmltag"
>id</CODE
> attribute</A
></DT
><DT
>4.2.2. <A
HREF="#sc-vendor_element_name_attribute"
>The <CODE
CLASS="sgmltag"
>name</CODE
> attribute</A
></DT
></DL
></DD
></DL
></DD
><DT
>5. <A
HREF="#ch-device_lists"
>Device Lists</A
></DT
><DD
><DL
><DT
>5.1. <A
HREF="#sc-device_list_element"
>The
        <CODE
CLASS="sgmltag"
>device_list</CODE
> element</A
></DT
><DD
><DL
><DT
>5.1.1. <A
HREF="#sc-device_list_element_bus_attribute"
>The
          <CODE
CLASS="sgmltag"
>bus</CODE
> attribute</A
></DT
></DL
></DD
><DT
>5.2. <A
HREF="#sc-device_element"
>The <CODE
CLASS="sgmltag"
>device</CODE
> element</A
></DT
><DT
>5.3. <A
HREF="#sc-data_element"
>The <CODE
CLASS="sgmltag"
>data</CODE
> element</A
></DT
><DD
><DL
><DT
>5.3.1. <A
HREF="#sc-data_element_class_attribute"
>The <CODE
CLASS="sgmltag"
>class</CODE
> attribute</A
></DT
><DT
>5.3.2. <A
HREF="#sc-data_element_version_attribute"
>The <CODE
CLASS="sgmltag"
>version</CODE
> attribute</A
></DT
></DL
></DD
><DT
>5.4. <A
HREF="#sc-accessing_device_data"
>Accessing the Device
        Data</A
></DT
></DL
></DD
></DL
></DD
><DT
>II. <A
HREF="#pt-data_content"
>Recommended Data Content Conventions</A
></DT
><DD
><DL
><DT
>6. <A
HREF="#ch-data_hierarchy"
>Data Hierarchy</A
></DT
><DD
><DL
><DT
>6.1. <A
HREF="#sc-linux_kernel_modules"
>Linux Kernel Modules</A
></DT
><DT
>6.2. <A
HREF="#sc-xfree86_x_servers"
>XFree86 X Servers</A
></DT
><DT
>6.3. <A
HREF="#sc-locally-defined_interfaces"
>Locally-Defined Interfaces</A
></DT
></DL
></DD
><DT
>7. <A
HREF="#ch-order-matters"
>Why Order Matters</A
></DT
><DT
>8. <A
HREF="#ch-using_data_versioning"
>Using Data Versioning</A
></DT
><DD
><DL
><DT
>8.1. <A
HREF="#sc-specifying_range"
>Specifying a Range</A
></DT
><DT
>8.2. <A
HREF="#sc-how_discover_library_matches_range"
>How the <SPAN
CLASS="application"
>Discover</SPAN
> Library Matches a Range</A
></DT
></DL
></DD
></DL
></DD
><DT
>III. <A
HREF="#pt-command-line_tools"
>Command-Line Tools</A
></DT
><DD
><DL
><DT
>9. <A
HREF="#ch-discover_manpage"
><B
CLASS="command"
>discover</B
> Manual Page</A
></DT
><DD
><DL
><DT
><A
HREF="#AEN798"
>discover</A
>&nbsp;--&nbsp;hardware detection utility</DT
></DL
></DD
><DT
>10. <A
HREF="#ch-discover-conf_manpage"
><TT
CLASS="filename"
>discover.conf</TT
> Manual Page</A
></DT
><DD
><DL
><DT
><A
HREF="#AEN1223"
>discover.conf</A
>&nbsp;--&nbsp;configuration file format for discover(1)</DT
></DL
></DD
><DT
>11. <A
HREF="#ch-discover-modprobe_manpage"
><B
CLASS="command"
>discover-modprobe</B
>
      Manual Page</A
></DT
><DD
><DL
><DT
><A
HREF="#AEN1270"
>discover-modprobe</A
>&nbsp;--&nbsp;kernel module loading using discover(1)</DT
></DL
></DD
><DT
>12. <A
HREF="#ch-discover-modprobe-conf_manpage"
><TT
CLASS="filename"
>discover-modprobe.conf</TT
>
      Manual Page</A
></DT
><DD
><DL
><DT
><A
HREF="#AEN1333"
>discover-modprobe.conf</A
>&nbsp;--&nbsp;configuration file for discover-modprobe(5)</DT
></DL
></DD
></DL
></DD
><DT
>IV. <A
HREF="#pt-library"
>Library</A
></DT
><DD
><DL
><DT
>13. <A
HREF="#ch-discover_library"
>The <SPAN
CLASS="application"
>Discover</SPAN
> Library</A
></DT
><DD
><DL
><DT
>13.1. <A
HREF="#sc-library_design_principles"
>Library Design
        Principles</A
></DT
><DT
>13.2. <A
HREF="#sc-discover_data_sources"
><SPAN
CLASS="application"
>Discover</SPAN
> Data
        Sources</A
></DT
><DT
>13.3. <A
HREF="#sc-bus_map"
>The Bus Map</A
></DT
><DT
>13.4. <A
HREF="#sc-scanning_system"
>Scanning the System</A
></DT
><DT
>13.5. <A
HREF="#sc-using_discover_device_t_structures"
>Using
        <SPAN
CLASS="type"
>discover_device_t</SPAN
> Structures</A
></DT
></DL
></DD
><DT
>14. <A
HREF="#ch-sysdeps"
>System Dependencies</A
></DT
><DD
><DL
><DT
>14.1. <A
HREF="#sc-sysdeps_api"
><ACRONYM
CLASS="acronym"
>API</ACRONYM
></A
></DT
></DL
></DD
></DL
></DD
><DT
>A. <A
HREF="#ap-discover_api_reference"
><SPAN
CLASS="application"
>Discover</SPAN
> <ACRONYM
CLASS="acronym"
>API</ACRONYM
> Reference</A
></DT
><DT
>B. <A
HREF="#ap-discover_dtd"
><SPAN
CLASS="application"
>Discover</SPAN
> <ACRONYM
CLASS="acronym"
>DTD</ACRONYM
></A
></DT
><DT
>C. <A
HREF="#ap-discover_conf_dtd"
><SPAN
CLASS="application"
>Discover</SPAN
> Configuration File <ACRONYM
CLASS="acronym"
>DTD</ACRONYM
></A
></DT
><DT
>D. <A
HREF="#ap-licensing_issue_linux_sysdeps"
>Licensing Issue on the Linux Sysdeps</A
></DT
></DL
></DIV
><DIV
CLASS="LOT"
><DL
CLASS="LOT"
><DT
><B
>List of Figures</B
></DT
><DT
>6-1. <A
HREF="#fg-linux_interface"
>Linux interface</A
></DT
><DT
>6-2. <A
HREF="#fg-xfree86_interface"
>XFree86 interface</A
></DT
></DL
></DIV
><DIV
CLASS="LOT"
><DL
CLASS="LOT"
><DT
><B
>List of Examples</B
></DT
><DT
>3-1. <A
HREF="#ex-busclass_list"
>The
        <CODE
CLASS="sgmltag"
>busclass_list</CODE
> element</A
></DT
><DT
>4-1. <A
HREF="#ex-vendor_list"
>The <CODE
CLASS="sgmltag"
>vendor_list</CODE
>
        element</A
></DT
><DT
>5-1. <A
HREF="#ex-sample_device_data"
>Sample device data</A
></DT
><DT
>6-1. <A
HREF="#ex-defining_an_interface"
>Defining an interface</A
></DT
><DT
>6-2. <A
HREF="#ex-using_linux_interface"
>Using the <CODE
CLASS="sgmltag"
>linux</CODE
> interface</A
></DT
><DT
>6-3. <A
HREF="#ex-using_xfree86_interface"
>Using the <CODE
CLASS="sgmltag"
>xfree86</CODE
> interface</A
></DT
><DT
>7-1. <A
HREF="#AEN737"
>Matching <CODE
CLASS="sgmltag"
>device</CODE
> elements</A
></DT
><DT
>8-1. <A
HREF="#ex-using_version_attribute_of_data_element"
>Using the
          <CODE
CLASS="sgmltag"
>version</CODE
> attribute of the
          <CODE
CLASS="sgmltag"
>data</CODE
> element</A
></DT
><DT
>9-1. <A
HREF="#d1-ex-scan-buses"
>Scan the local buses</A
></DT
><DT
>9-2. <A
HREF="#d1-ex-view-video-cards"
>View PCI video cards</A
></DT
><DT
>9-3. <A
HREF="#d1-ex-query-xfree86"
>Query for the driver module for
      XFree86 server version 4.2.0</A
></DT
><DT
>9-4. <A
HREF="#d1-ex-type-summary"
>Get model and vendor
      information by type</A
></DT
><DT
>10-1. <A
HREF="#AEN1252"
>Establishing default buses to scan</A
></DT
><DT
>10-2. <A
HREF="#AEN1255"
>A more complex example</A
></DT
><DT
>14-1. <A
HREF="#AEN1558"
>Linux <ACRONYM
CLASS="acronym"
>PCI</ACRONYM
> sysdep code</A
></DT
></DL
></DIV
><DIV
CLASS="preface"
><HR><H1
><A
NAME="pr-what_is_discover"
></A
>What Is <SPAN
CLASS="application"
>Discover</SPAN
>?</H1
><P
><SPAN
CLASS="application"
>Discover</SPAN
> is a tool that reports information about a
    system's hardware.  It uses operating system-dependent modules
    (selected at build time) to detect what hardware is actually on the
    system and provides system-independent interfaces for querying <ACRONYM
CLASS="acronym"
>XML</ACRONYM
> data
    sources about this hardware.  These data sources contain specific
    information required to enable support for various devices via defined
    software interfaces.  The tool can be accessed by linking to the
    <SPAN
CLASS="application"
>Discover</SPAN
> library or by calling <A
HREF="#ch-discover_manpage"
><B
CLASS="command"
>discover</B
></A
> (which
    itself links to the <SPAN
CLASS="application"
>Discover</SPAN
> library) and parsing its output.  In the
    future, other interfaces (for example, modules for interpreted
    languages such as Perl and Python) may be included.</P
><P
>Why use <SPAN
CLASS="application"
>Discover</SPAN
>?  There are at least a few reasons:</P
><P
></P
><UL
><LI
><P
><EM
>Flexibility.</EM
> <SPAN
CLASS="application"
>Discover</SPAN
> is designed
        from the ground up to be flexible.  It is portable to a variety
        of operating environments, and its modular design supports the
        addition
        of arbitrary methods for querying the host operating system (OS)
        about installed devices.  <SPAN
CLASS="application"
>Discover</SPAN
> is also designed to be
        flexible in terms of the types of data that can be retrieved.
        <SPAN
CLASS="application"
>Discover</SPAN
> does not tie the user to retrieving only one type of
        information, such as the name of the Linux kernel module that
        should be loaded to support a given device.  Instead, <SPAN
CLASS="application"
>Discover</SPAN
>
        supports the association of arbitrary data with hardware devices,
        typically through specification of an interface to the hardware in
        question, such as a Linux kernel module or an XFree86 server driver
        module.</P
></LI
><LI
><P
><EM
>Updatability.</EM
> Many
        hardware-autodetection programs suffer from an inherent
        limitation in that they are restricted to reading hardware
        lists or databases that are stored on the local filesystem.
        This is not an efficient approach in the fast-moving world of
        consumer computer hardware, with new devices constantly being
        introduced.  A couple of months after the latest version of
        your OS of choice is released, it may fail to recognize that
        the latest revision of, for instance, a video chipset is
        compatible with an older one, and can use the same software
        interfaces.  <SPAN
CLASS="application"
>Discover</SPAN
> overcomes this problem by supporting the
        retrieval of hardware information via <ACRONYM
CLASS="acronym"
>HTTP</ACRONYM
><A
NAME="AEN53"
HREF="#FTN.AEN53"
><SPAN
CLASS="footnote"
>[1]</SPAN
></A
> (<SPAN
CLASS="QUOTE"
>"over the web"</SPAN
>).  When
        <ACRONYM
CLASS="acronym"
>HTTP</ACRONYM
> access is impossible, <SPAN
CLASS="application"
>Discover</SPAN
> falls back to
        locally stored hardware lists.</P
></LI
><LI
><P
><EM
>Portability.</EM
> On top of its
        flexibility in terms of system interfaces to hardware, <SPAN
CLASS="application"
>Discover</SPAN
>
        has been written to be broadly portable to all of
        today's popular POSIX-compliant systems.  <SPAN
CLASS="application"
>Discover</SPAN
> is not a
        Linux-only solution.  <SPAN
CLASS="application"
>Discover</SPAN
> is intended to provide operating
        system vendors, computer manufacturers, and third-party vendors of
        software and peripherals with a powerful tool for describing the
        hardware they support to the interfaces they care about.  Because
        <SPAN
CLASS="application"
>Discover</SPAN
>'s data sources can be anywhere on the Internet, the OS
        vendor need not be the sole provider of hardware catalogs.</P
></LI
><LI
><P
><EM
>Usability.</EM
> <SPAN
CLASS="application"
>Discover</SPAN
> is not an in-house
        tool designed to solve a narrow class of problems.  <SPAN
CLASS="application"
>Discover</SPAN
> is
        designed to be easy to use from the perspectives of the individual
        system administrator, the applications programmer, and the hardware
        manufacturer or support staff.  <SPAN
CLASS="application"
>Discover</SPAN
>'s <ACRONYM
CLASS="acronym"
>XML</ACRONYM
> database
        structure, its command-line tools, and its library <ACRONYM
CLASS="acronym"
>API</ACRONYM
> are
        well documented and support extensions to meet diverse
        demands.</P
></LI
><LI
><P
><EM
>Freely licensed.</EM
> <SPAN
CLASS="application"
>Discover</SPAN
> has a
        copyright license that is highly adaptable to the needs of the
        varied audiences to which <SPAN
CLASS="application"
>Discover</SPAN
> is targeted.  Under the
        so-called
        <SPAN
CLASS="QUOTE"
>"UCB/BSD"</SPAN
> or <SPAN
CLASS="QUOTE"
>"MIT/X Consortium"</SPAN
> terms,
        after the names of American universities and some very well known
        software projects that used these terms, anyone is free to copy,
        modify, and distribute the software, and to extend (or not) these
        same freedoms to those who receive the software.  Progeny
        would like to see <SPAN
CLASS="application"
>Discover</SPAN
> adopted by a wide variety of existing
        software products, such the various GNU/Linux distributions; the
        FreeBSD, NetBSD, and OpenBSD projects; the GNU Project of the Free
        Software Foundation; the XFree86 Project; system integrators; and
        the designers and manufacturers of computer hardware.
        We believe that <SPAN
CLASS="application"
>Discover</SPAN
>'s design empowers those with the
        greatest knowledge of hardware and the software interfaces to that
        hardware to express
        that knowledge and make it available to the world, thereby
        ameliorating an entire class of computer configuration problems.
        Progeny does not want <SPAN
CLASS="application"
>Discover</SPAN
>'s licensing to stand in the way of
        realizing that dream, which is why we have chosen these license
        terms.</P
></LI
></UL
><P
>We must take a moment to explain what <SPAN
CLASS="application"
>Discover</SPAN
> is
    <EM
>not</EM
>: <SPAN
CLASS="application"
>Discover</SPAN
> is not a replacement for the
    service &#8212; usually provided by the underlying operating system
    kernel or a user-space program that interfaces with it &#8212; of
    simply translating bus-specific vendor and model identifiers to
    human-readable names.  <SPAN
CLASS="application"
>Discover</SPAN
> performs its own translations of
    this data as a convenience for generating human-readable reports, but
    it does not attempt to enumerate all hardware devices that exist for a
    particular bus architecture.  Rather, <SPAN
CLASS="application"
>Discover</SPAN
> is intended only to
    catalog data for which there is some useful information to impart
    regarding software interfaces.  Facilities already exist in modern
    operating systems for answering the questions <SPAN
CLASS="QUOTE"
>"What is the name
    of this device?"</SPAN
> and <SPAN
CLASS="QUOTE"
>"Who manufactured it?"</SPAN
>
    <SPAN
CLASS="application"
>Discover</SPAN
>'s role is to answer questions like <SPAN
CLASS="QUOTE"
>"What Linux kernel
    module do I need to load for this device to work?"</SPAN
>  More
    importantly, <SPAN
CLASS="application"
>Discover</SPAN
> will enable you to provide answers in the
    future to questions you don't even expect to ask today.</P
><P
><SPAN
CLASS="application"
>Discover</SPAN
> is not intended to be a comprehensive
    hardware-management tool.  It is an
    <EM
>enabling technology</EM
>,
    designed to provide data that a tool layered above it can use.  Two
    applications are provided with <SPAN
CLASS="application"
>Discover</SPAN
> to demonstrate how the
    library can be leveraged: the command-line utility <B
CLASS="command"
>discover</B
>,
    and a Linux kernel module loading script,
    <B
CLASS="command"
>discover-modprobe</B
>, designed to be invoked at system
    boot time.</P
><P
>This manual is divided into four parts.  First, we examine the
    <SPAN
CLASS="application"
>Discover</SPAN
> <ACRONYM
CLASS="acronym"
>XML</ACRONYM
> data file format, exploring the elements and
    attributes used to describe hardware and various interfaces to it. This
    part will enable you to read and understand a <SPAN
CLASS="application"
>Discover</SPAN
> <ACRONYM
CLASS="acronym"
>XML</ACRONYM
> file.  
    Next, we offer some recommendations for writing your own <SPAN
CLASS="application"
>Discover</SPAN
>
    <ACRONYM
CLASS="acronym"
>XML</ACRONYM
> data. Knowing the syntax is valuable, but knowing how best to
    take advantage of it is even more useful.  We then present the
    reference pages describing Progeny's <SPAN
CLASS="application"
>Discover</SPAN
>-based command-line
    tools and the configuration files used to control their behavior. You
    may want to use these references as a guide when implementing your own
    <SPAN
CLASS="application"
>Discover</SPAN
>-based applications.  The final part describes the <SPAN
CLASS="application"
>Discover</SPAN
>
    library <ACRONYM
CLASS="acronym"
>API</ACRONYM
> so that you can develop your own solutions based on
    <SPAN
CLASS="application"
>Discover</SPAN
>.  Appendices offer references to the formal descriptions of
    the <SPAN
CLASS="application"
>Discover</SPAN
> <ACRONYM
CLASS="acronym"
>API</ACRONYM
> and <ACRONYM
CLASS="acronym"
>XML</ACRONYM
> <ACRONYM
CLASS="acronym"
>DTD</ACRONYM
>s.</P
></DIV
><DIV
CLASS="PART"
><A
NAME="pt-data_structure"
></A
><DIV
CLASS="TITLEPAGE"
><H1
CLASS="title"
>I. Data Structure</H1
><DIV
CLASS="TOC"
><DL
><DT
><B
>Table of Contents</B
></DT
><DT
>1. <A
HREF="#ch-overview_discover_data_format"
>Overview of
      the <SPAN
CLASS="application"
>Discover</SPAN
> Data Format</A
></DT
><DT
>2. <A
HREF="#ch-master_list"
>Master List</A
></DT
><DT
>3. <A
HREF="#ch-busclass_lists"
>Busclass Lists</A
></DT
><DD
><DL
><DT
>3.1. <A
HREF="#sc-busclass_list_element"
>The
        <CODE
CLASS="sgmltag"
>busclass_list</CODE
> element</A
></DT
><DD
><DL
><DT
>3.1.1. <A
HREF="#sc-busclass_list_element_bus_attribute"
>The
          <CODE
CLASS="sgmltag"
>bus</CODE
> attribute</A
></DT
></DL
></DD
><DT
>3.2. <A
HREF="#sc-busclass_element"
>The
        <CODE
CLASS="sgmltag"
>busclass</CODE
> element</A
></DT
><DD
><DL
><DT
>3.2.1. <A
HREF="#sc-busclass_element_id_attribute"
>The
          <CODE
CLASS="sgmltag"
>id</CODE
> attribute</A
></DT
><DT
>3.2.2. <A
HREF="#sc-busclass_element_name_attribute"
>The
          <CODE
CLASS="sgmltag"
>name</CODE
> attribute</A
></DT
></DL
></DD
></DL
></DD
><DT
>4. <A
HREF="#ch-vendor_lists"
>Vendor Lists</A
></DT
><DD
><DL
><DT
>4.1. <A
HREF="#sc-vendor_list_element"
>The
        <CODE
CLASS="sgmltag"
>vendor_list</CODE
> element</A
></DT
><DD
><DL
><DT
>4.1.1. <A
HREF="#sc-vendor_list_element_bus_attribute"
>The
          <CODE
CLASS="sgmltag"
>bus</CODE
> attribute</A
></DT
></DL
></DD
><DT
>4.2. <A
HREF="#sc-vendor_element"
>The <CODE
CLASS="sgmltag"
>vendor</CODE
> element</A
></DT
><DD
><DL
><DT
>4.2.1. <A
HREF="#sc-vendor_element_id_attribute"
>The <CODE
CLASS="sgmltag"
>id</CODE
> attribute</A
></DT
><DT
>4.2.2. <A
HREF="#sc-vendor_element_name_attribute"
>The <CODE
CLASS="sgmltag"
>name</CODE
> attribute</A
></DT
></DL
></DD
></DL
></DD
><DT
>5. <A
HREF="#ch-device_lists"
>Device Lists</A
></DT
><DD
><DL
><DT
>5.1. <A
HREF="#sc-device_list_element"
>The
        <CODE
CLASS="sgmltag"
>device_list</CODE
> element</A
></DT
><DD
><DL
><DT
>5.1.1. <A
HREF="#sc-device_list_element_bus_attribute"
>The
          <CODE
CLASS="sgmltag"
>bus</CODE
> attribute</A
></DT
></DL
></DD
><DT
>5.2. <A
HREF="#sc-device_element"
>The <CODE
CLASS="sgmltag"
>device</CODE
> element</A
></DT
><DT
>5.3. <A
HREF="#sc-data_element"
>The <CODE
CLASS="sgmltag"
>data</CODE
> element</A
></DT
><DD
><DL
><DT
>5.3.1. <A
HREF="#sc-data_element_class_attribute"
>The <CODE
CLASS="sgmltag"
>class</CODE
> attribute</A
></DT
><DT
>5.3.2. <A
HREF="#sc-data_element_version_attribute"
>The <CODE
CLASS="sgmltag"
>version</CODE
> attribute</A
></DT
></DL
></DD
><DT
>5.4. <A
HREF="#sc-accessing_device_data"
>Accessing the Device
        Data</A
></DT
></DL
></DD
></DL
></DIV
></DIV
><DIV
CLASS="chapter"
><HR><H1
><A
NAME="ch-overview_discover_data_format"
></A
>Chapter 1. Overview of
      the <SPAN
CLASS="application"
>Discover</SPAN
> Data Format</H1
><P
>Most modern computer peripherals contain self-identifying
      information in a format standardized for the hardware interface
      (bus).  This enables the OS on the host system
      to query or scan a bus and catalog the devices.  In general, the OS
      stores this information in the same basic format in which it is
      returned, without translating it more times than necessary for
      device drivers to communicate with the peripheral.  However, this
      information varies by bus type and is often insufficiently clear for
      human consumption. Furthermore, many operating systems do not contain
      a comprehensive database that maps each peripheral to every subsystem
      running on the OS that may want to communicate with that peripheral.
      <SPAN
CLASS="application"
>Discover</SPAN
> addresses these issues by providing flexible databases
      stored in <ACRONYM
CLASS="acronym"
>XML</ACRONYM
> format.</P
><P
>Extensible Markup Language (<ACRONYM
CLASS="acronym"
>XML</ACRONYM
>) is a highly flexible
      hypertext format. <SPAN
CLASS="application"
>Discover</SPAN
> uses <ACRONYM
CLASS="acronym"
>XML</ACRONYM
> exclusively to store hardware
      information externally.  Some familiarity with <ACRONYM
CLASS="acronym"
>XML</ACRONYM
> syntax is
      therefore assumed. For more information,
      see <A
HREF="http://www.w3.org/XML/"
TARGET="_top"
>the
      W3C's <ACRONYM
CLASS="acronym"
>XML</ACRONYM
> website</A
>.</P
><P
>For a formal description of <SPAN
CLASS="application"
>Discover</SPAN
>'s <ACRONYM
CLASS="acronym"
>XML</ACRONYM
> data format, see
      the <SPAN
CLASS="application"
>Discover</SPAN
> <A
HREF="#ap-discover_dtd"
>Document Type
      Definition (<ACRONYM
CLASS="acronym"
>DTD</ACRONYM
>)</A
> document.  The purpose of this document is
      to present the information in a form digestible by the novice.</P
><P
>Because each hardware bus type, such as <ACRONYM
CLASS="acronym"
>PCI</ACRONYM
> or <ACRONYM
CLASS="acronym"
>USB</ACRONYM
>,
      communicates different details about the connected devices
      (essentially, each one solves the same problem in a different way),
      <SPAN
CLASS="application"
>Discover</SPAN
> has a different set of lists for each bus type.  For each
      bus, up to three lists are stored: a bus class list
      maps the bus specification's notion of a device type (hereinafter
      referred to as a <SPAN
CLASS="QUOTE"
>"device class"</SPAN
> to reduce confusion) to
      <SPAN
CLASS="application"
>Discover</SPAN
>'s device types, which are used for running selective
      queries; a vendor list associates bus-specific vendor identification
      data with natural-language names for hardware vendors; and a device
      list contains information specific to individual devices.</P
></DIV
><DIV
CLASS="chapter"
><HR><H1
><A
NAME="ch-master_list"
></A
>Chapter 2. Master List</H1
><P
>When <SPAN
CLASS="application"
>Discover</SPAN
> is provided with a <ACRONYM
CLASS="acronym"
>URL</ACRONYM
> for the retrieval of
      hardware information, the data retrieved is expected to be in
      <ACRONYM
CLASS="acronym"
>XML</ACRONYM
> format and to contain further <ACRONYM
CLASS="acronym"
>URL</ACRONYM
>s for retrieval.</P
><P
>The root element must be <CODE
CLASS="sgmltag"
>discover-data</CODE
>, which has no attributes,
        and can only contain <CODE
CLASS="sgmltag"
>location</CODE
>
        elements.</P
><P
>The <CODE
CLASS="sgmltag"
>location</CODE
> element is
      always empty, and has three required attributes: <CODE
CLASS="sgmltag"
>bus</CODE
>, <CODE
CLASS="sgmltag"
>type</CODE
>, and <CODE
CLASS="sgmltag"
>url</CODE
>.</P
><P
></P
><DIV
CLASS="variablelist"
><P
><B
><CODE
CLASS="sgmltag"
>location</CODE
>
        Attributes</B
></P
><DL
><DT
><CODE
CLASS="sgmltag"
>type</CODE
></DT
><DD
><P
>This attribute can have one of these values: <CODE
CLASS="sgmltag"
>busclass</CODE
>, <CODE
CLASS="sgmltag"
>device</CODE
>, or <CODE
CLASS="sgmltag"
>vendor</CODE
>. See <A
HREF="#ch-busclass_lists"
>Chapter 3</A
>, <A
HREF="#ch-vendor_lists"
>Chapter 4</A
>, and <A
HREF="#ch-device_lists"
>Chapter 5</A
>.</P
></DD
><DT
><CODE
CLASS="sgmltag"
>url</CODE
></DT
><DD
><P
>This must be a valid <ACRONYM
CLASS="acronym"
>URL</ACRONYM
> containing one of the three
              types of data lists.</P
></DD
><DT
><CODE
CLASS="sgmltag"
>bus</CODE
></DT
><DD
><P
>This is the bus to which the <ACRONYM
CLASS="acronym"
>URL</ACRONYM
> applies.  See <A
HREF="#sc-busclass_element_name_attribute"
>Section 3.2.2</A
> for a list of
            valid bus names.</P
></DD
></DL
></DIV
></DIV
><DIV
CLASS="chapter"
><HR><H1
><A
NAME="ch-busclass_lists"
></A
>Chapter 3. Busclass Lists</H1
><P
>As noted in the previous chapter, a busclass list provides a
      mapping between device classes recognized by the hardware bus and the
      device type names used by <SPAN
CLASS="application"
>Discover</SPAN
>.  Because every bus is
      different, sometimes there is no perfect, one-to-one correspondence
      between <SPAN
CLASS="application"
>Discover</SPAN
> device types and the device classes recognized by
      a particular bus.  This is one reason that the busclass lists, like
      other types of <SPAN
CLASS="application"
>Discover</SPAN
> data lists, are updatable.
      Revisions in a bus specification may demand updates to the
      mapping.</P
><P
>The device classes recognized by a bus are typically determined
      by the specification for the bus as determined by a standards
      committee or other technical body, and do not change frequently (if
      at all).</P
><DIV
CLASS="example"
><A
NAME="ex-busclass_list"
></A
><P
><B
>Example 3-1. The
        <CODE
CLASS="sgmltag"
>busclass_list</CODE
> element</B
></P
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
WIDTH="100%"
><TR
><TD
><FONT
COLOR="#000000"
><PRE
CLASS="programlisting"
>&#60;?xml version="1.0"?&#62;

&#60;busclass_list bus="usb"&#62;
  &#60;busclass id="0202" name="modem"/&#62;
  &#60;busclass id="1030" name="broadband"/&#62;
  &#60;busclass id="0101" name="printer"/&#62;
  &#60;busclass id="ffff" name="imaging"/&#62;
  &#60;busclass id="0206" name="network"/&#62;
  &#60;busclass id="0300" name="humaninput"/&#62;
  &#60;busclass id="ff00" name="video"/&#62;
  &#60;busclass id="0000" name="unknown"/&#62;
  &#60;busclass id="0804" name="removabledisk"/&#62;
&#60;/busclass_list&#62;</PRE
></FONT
></TD
></TR
></TABLE
></DIV
><P
>In the foregoing example, we can see one possible mapping of
      the <ACRONYM
CLASS="acronym"
>USB</ACRONYM
> bus's numeric device class IDs to <SPAN
CLASS="application"
>Discover</SPAN
>'s device type
      names (see <A
HREF="#sc-busclass_element_name_attribute"
>Section 3.2.2</A
>).
      The file begins by declaring the version of the <ACRONYM
CLASS="acronym"
>XML</ACRONYM
> standard to
      which it conforms, and then presents data.  The format should be
      fairly familiar to those accustomed to <ACRONYM
CLASS="acronym"
>HTML</ACRONYM
>-style structured markup
      languages.</P
><P
>Not all of <SPAN
CLASS="application"
>Discover</SPAN
>'s supported device types are listed in
      the example; for example, <TT
CLASS="literal"
>display</TT
> is missing.
      This is not a problem, since not all buses are used for all hardware
      applications.  <ACRONYM
CLASS="acronym"
>USB</ACRONYM
> 1.1 would be a poor choice of bus for
      <ACRONYM
CLASS="acronym"
>VGA</ACRONYM
>-compatible display controllers, for instance, because the
      available bandwidth on the <ACRONYM
CLASS="acronym"
>USB</ACRONYM
> 1.1 bus is insufficient to handle
      typical data loads for such devices.</P
><P
>Another infelicity in the above example is the association of
      the <TT
CLASS="literal"
>ffff</TT
> device class ID with the <SPAN
CLASS="application"
>Discover</SPAN
> 
      device type <TT
CLASS="literal"
>imaging</TT
>.  In actuality, a device type 
      class of <TT
CLASS="literal"
>ffff</TT
> in the <ACRONYM
CLASS="acronym"
>USB</ACRONYM
> specification indicates 
      a device of an unknown classification.  In practice, most
      consumer-level devices with this device class are scanners, one of 
      the first applications of <ACRONYM
CLASS="acronym"
>USB</ACRONYM
> technology in the consumer 
      marketplace.  It is
      possible that in certain deployments, the association of <ACRONYM
CLASS="acronym"
>USB</ACRONYM
>'s
      unknown device class ID with <SPAN
CLASS="application"
>Discover</SPAN
>'s <TT
CLASS="literal"
>imaging</TT
>
      device type is suboptimal &#8212; another reason the busclass lists
      are not hard-coded into the library.</P
><DIV
CLASS="section"
><HR><H2
CLASS="section"
><A
NAME="sc-busclass_list_element"
>3.1. The
        <CODE
CLASS="sgmltag"
>busclass_list</CODE
> element</A
></H2
><P
>A <CODE
CLASS="sgmltag"
>busclass_list</CODE
> element possesses a
        <CODE
CLASS="sgmltag"
>bus</CODE
> attribute and contains one or more
        <CODE
CLASS="sgmltag"
>busclass</CODE
> elements.</P
><DIV
CLASS="section"
><HR><H3
CLASS="section"
><A
NAME="sc-busclass_list_element_bus_attribute"
>3.1.1. The
          <CODE
CLASS="sgmltag"
>bus</CODE
> attribute</A
></H3
><P
>The <CODE
CLASS="sgmltag"
>bus</CODE
> attribute of the
          <CODE
CLASS="sgmltag"
>busclass_list</CODE
> element is set to the name of
          the bus being described by the busclass list.</P
><P
>The <CODE
CLASS="sgmltag"
>bus</CODE
> attribute
          presently supports the following values:</P
><P
></P
><UL
><LI
><P
><TT
CLASS="literal"
>ata</TT
></P
></LI
><LI
><P
><TT
CLASS="literal"
>pci</TT
></P
></LI
><LI
><P
><TT
CLASS="literal"
>pcmcia</TT
></P
></LI
><LI
><P
><TT
CLASS="literal"
>scsi</TT
></P
></LI
><LI
><P
><TT
CLASS="literal"
>usb</TT
></P
></LI
></UL
><P
>We expect to support more buses in the future;
          <TT
CLASS="literal"
>ieee1394</TT
> and <TT
CLASS="literal"
>sbus</TT
> are
          possible candidates.</P
></DIV
></DIV
><DIV
CLASS="section"
><HR><H2
CLASS="section"
><A
NAME="sc-busclass_element"
>3.2. The
        <CODE
CLASS="sgmltag"
>busclass</CODE
> element</A
></H2
><P
>A <CODE
CLASS="sgmltag"
>busclass</CODE
> element possesses two
        attributes, <CODE
CLASS="sgmltag"
>id</CODE
> and <CODE
CLASS="sgmltag"
>name</CODE
>, and
        contains no elements.</P
><DIV
CLASS="section"
><HR><H3
CLASS="section"
><A
NAME="sc-busclass_element_id_attribute"
>3.2.1. The
          <CODE
CLASS="sgmltag"
>id</CODE
> attribute</A
></H3
><P
>The <CODE
CLASS="sgmltag"
>id</CODE
> attribute is set to a bus-specific
          device class identifier.</P
></DIV
><DIV
CLASS="section"
><HR><H3
CLASS="section"
><A
NAME="sc-busclass_element_name_attribute"
>3.2.2. The
          <CODE
CLASS="sgmltag"
>name</CODE
> attribute</A
></H3
><P
>The <CODE
CLASS="sgmltag"
>name</CODE
> attribute is set to a
          <SPAN
CLASS="application"
>Discover</SPAN
> device type.  <SPAN
CLASS="application"
>Discover</SPAN
>'s device types are an effort
          to balance a few criteria:</P
><P
></P
><UL
><LI
><P
>Device types (<SPAN
CLASS="QUOTE"
>"bus classes"</SPAN
> in <SPAN
CLASS="application"
>Discover</SPAN
>
              terminology) defined by the <ACRONYM
CLASS="acronym"
>PCI</ACRONYM
> specification</P
></LI
><LI
><P
>Bus classes defined by the <ACRONYM
CLASS="acronym"
>USB</ACRONYM
> specification</P
></LI
><LI
><P
>Bus classes defined by the <ACRONYM
CLASS="acronym"
>SCSI</ACRONYM
> specification</P
></LI
><LI
><P
>Device types commonly conceived of by the personal
              computer user</P
></LI
></UL
><P
><SPAN
CLASS="application"
>Discover</SPAN
>'s definitions of device types will not meet with
          universal agreement; as happens in most categorization problems,
          some decisions had to be made arbitrarily.  <SPAN
CLASS="application"
>Discover</SPAN
> does not
          attempt to solve the general problem of grouping various
          peripherals into categories; rather, <SPAN
CLASS="application"
>Discover</SPAN
> solves the
          problem for itself and uses bus-specific mappings to translate a
          device's own notion of its type to <SPAN
CLASS="application"
>Discover</SPAN
>'s device
          type.</P
><P
></P
><UL
><LI
><P
><TT
CLASS="literal"
>audio</TT
></P
><P
>A device capable of producing an analog or digital
    sound signal is an <I
CLASS="firstterm"
>audio</I
> device.
    Typically, any device commonly referred to as a
    <SPAN
CLASS="QUOTE"
>"sound card"</SPAN
> is classified by <SPAN
CLASS="application"
>Discover</SPAN
> as
    an audio device.</P
></LI
><LI
><P
><TT
CLASS="literal"
>bridge</TT
></P
><P
>A device that provides access to devices of a
    different type, commonly on a different bus, is a
    <I
CLASS="firstterm"
>bridge</I
> device.  For instance, consumer
    <ACRONYM
CLASS="acronym"
>PCI</ACRONYM
> chipsets often feature a bridge to <ACRONYM
CLASS="acronym"
>ATA</ACRONYM
> (also
    known as IDE) devices.</P
></LI
><LI
><P
><TT
CLASS="literal"
>broadband</TT
></P
><P
>An interface device to a computer communications
    network implemented on top of a technology not explicitly
    designed for that purpose is a <I
CLASS="firstterm"
>broadband</I
>
    device.  Examples include ISDN terminal adapters as well
    as DSL and cable <SPAN
CLASS="QUOTE"
>"modems"</SPAN
>; analog
    phone-line modems are not included in this classification
    (see <SPAN
CLASS="QUOTE"
>"modem"</SPAN
> below).</P
></LI
><LI
><P
><TT
CLASS="literal"
>display</TT
></P
><P
>A device controlled by the host machine's CPU and
    capable of producing an analog or digital video signal
    for output purposes is a <I
CLASS="firstterm"
>display</I
> device.
    Typically, any device commonly referred to as a
    <SPAN
CLASS="QUOTE"
>"video card"</SPAN
> is classified by <SPAN
CLASS="application"
>Discover</SPAN
> as
    a display device.</P
></LI
><LI
><P
><TT
CLASS="literal"
>fixeddisk</TT
></P
><P
>A high-speed, fixed magnetic storage device such as
    a hard disk drive is a <I
CLASS="firstterm"
>fixeddisk</I
> device.
    Removable media devices such as floppy disk drives,
    CD-ROM drives, magneto-optical devices, tape drives, and
    Compact Flash card readers are not included in this
    classification.</P
></LI
><LI
><P
><TT
CLASS="literal"
>humaninput</TT
></P
><P
>A device that receives tactile input from a person
    for the purpose of directing a computer's activity is a
    <I
CLASS="firstterm"
>humaninput</I
> device.  Examples include
    keyboards, mice, trackballs, joysticks, gamepads, digital
    tablets manipulated with a stylus or finger, and so
    forth.  Input devices that rely upon non-tactile means of
    determining a person's intent, such as speech-recognition
    devices or cameras, are not included in this
    classification.</P
></LI
><LI
><P
><TT
CLASS="literal"
>imaging</TT
></P
><P
>A device that captures still images for input
    purposes is an <I
CLASS="firstterm"
>imaging</I
> device.  Scanners
    and digital cameras are examples of imaging
    devices.  Motion-capture devices such as television tuner
    cards, webcams, and digital video cameras are not
    included in this classification.</P
></LI
><LI
><P
><TT
CLASS="literal"
>miscellaneous</TT
></P
><P
>Any device that cannot logically be classified as
    another device type is a <I
CLASS="firstterm"
>miscellaneous</I
>
    device.</P
></LI
><LI
><P
><TT
CLASS="literal"
>modem</TT
></P
><P
>An analog phone-line modulator/demodulator
    (modem) is classified by <SPAN
CLASS="application"
>Discover</SPAN
> as a
    <I
CLASS="firstterm"
>modem</I
> device.  No other kind of device is
    so classified.</P
></LI
><LI
><P
><TT
CLASS="literal"
>network</TT
></P
><P
>An interface device to a conventional computer
    data communications network that does not require the use of a terminal
    adapter is a <I
CLASS="firstterm"
>network</I
> device.  For example,
    Ethernet and Token Ring network interface cards are network
    devices.  Analog phone-line modems; terminal adapters
    for technologies such as ISDN and DSL; and <SPAN
CLASS="QUOTE"
>"cable modems"</SPAN
>
    are not <SPAN
CLASS="QUOTE"
>"network"</SPAN
> devices.</P
></LI
><LI
><P
><TT
CLASS="literal"
>optical</TT
></P
><P
>An optical-technology storage device, often using
    read-only media, is an <I
CLASS="firstterm"
>optical</I
> device.  By
    far the most common examples of these devices are CD-ROM
    and DVD-ROM drives, including versions of these drives
    that can <SPAN
CLASS="QUOTE"
>"burn"</SPAN
> (write to) optical
    discs.</P
></LI
><LI
><P
><TT
CLASS="literal"
>printer</TT
></P
><P
>A device that renders visual output in a permanent
    or semi-permanent manner to a physical medium is a
    <I
CLASS="firstterm"
>printer</I
>.  Typically, any device
    colloquially referred to as a <SPAN
CLASS="QUOTE"
>"printer"</SPAN
> is
    also classified by <SPAN
CLASS="application"
>Discover</SPAN
> as a
    printer.</P
></LI
><LI
><P
><TT
CLASS="literal"
>removabledisk</TT
></P
><P
>Storage devices that feature removable media using
    just about any technology except that of magnetic tape,
    CD-ROM, and DVD-ROM drives are
    <I
CLASS="firstterm"
>removabledisk</I
> devices.  Examples include
    floppy disk drives, magneto-optical drives, and Compact
    Flash card readers.</P
></LI
><LI
><P
><TT
CLASS="literal"
>tape</TT
></P
><P
>A sequential-access mass storage device using
    magnetic tape is a <I
CLASS="firstterm"
>tape</I
> device.  Commonly
    used for archival and backup purposes, DAT drives are
    examples of tape devices.</P
></LI
><LI
><P
><TT
CLASS="literal"
>video</TT
></P
><P
>A device that produces a real-time digital video
    signal for input purposes is a <I
CLASS="firstterm"
>video</I
>
    device.  Webcams, digital video cameras, and television
    tuners are examples of video
    devices.  Note that still digital cameras with
    <SPAN
CLASS="QUOTE"
>"movie"</SPAN
> capability are
    <EM
>not</EM
> considered video
    devices unless they can transmit the live video signal to
    the host in real time.</P
></LI
></UL
></DIV
></DIV
></DIV
><DIV
CLASS="chapter"
><HR><H1
><A
NAME="ch-vendor_lists"
></A
>Chapter 4. Vendor Lists</H1
><P
>Many buses have vendor identification numbers
      that are registered with that bus's standardization body and
      programmed into the devices when they are manufactured.  These
      numbers generally are assigned arbitrarily, and typically have little
      meaning to the end user; therefore, most hardware detection tools
      provide a way to translate these numeric vendor IDs to human-readable
      strings.  Thus, instead of knowing that your <ACRONYM
CLASS="acronym"
>PCI</ACRONYM
> or <ACRONYM
CLASS="acronym"
>AGP</ACRONYM
> video card
      was manufactured by <SPAN
CLASS="QUOTE"
>"1002,"</SPAN
> you can determine that it
      was manufactured by <SPAN
CLASS="QUOTE"
>"ATI Technologies, Inc."</SPAN
></P
><DIV
CLASS="example"
><A
NAME="ex-vendor_list"
></A
><P
><B
>Example 4-1. The <CODE
CLASS="sgmltag"
>vendor_list</CODE
>
        element</B
></P
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
WIDTH="100%"
><TR
><TD
><FONT
COLOR="#000000"
><PRE
CLASS="programlisting"
>&#60;?xml version="1.0"?&#62;

&#60;vendor_list bus="pci"&#62;
  &#60;vendor id="0675" name="Dynalink"/&#62;
  &#60;vendor id="0e11" name="Compaq Computer Corporation"/&#62;
  &#60;vendor id="1004" name="VLSI Technology Inc"/&#62;
  &#60;vendor id="1025" name="Acer Incorporated [ALI]"/&#62;
  &#60;vendor id="102b" name="Matrox Graphics, Inc."/&#62;
  &#60;vendor id="109e" name="Brooktree Corporation"/&#62;
&#60;/vendor_list&#62;</PRE
></FONT
></TD
></TR
></TABLE
></DIV
><P
>The foregoing example is similar in structure to the <A
HREF="#ex-busclass_list"
>busclass list example</A
>; a numeric
      vendor ID maps to a vendor name, which can be used by <SPAN
CLASS="application"
>Discover</SPAN
> for
      queries or reports generated for the user's benefit.</P
><DIV
CLASS="section"
><HR><H2
CLASS="section"
><A
NAME="sc-vendor_list_element"
>4.1. The
        <CODE
CLASS="sgmltag"
>vendor_list</CODE
> element</A
></H2
><P
>A <CODE
CLASS="sgmltag"
>vendor_list</CODE
> element possesses a
        <CODE
CLASS="sgmltag"
>bus</CODE
> attribute and contains one or more
        <CODE
CLASS="sgmltag"
>vendor</CODE
> elements.</P
><DIV
CLASS="section"
><HR><H3
CLASS="section"
><A
NAME="sc-vendor_list_element_bus_attribute"
>4.1.1. The
          <CODE
CLASS="sgmltag"
>bus</CODE
> attribute</A
></H3
><P
>The <CODE
CLASS="sgmltag"
>bus</CODE
> attribute of the
          <CODE
CLASS="sgmltag"
>vendor_list</CODE
> element is set to the name of
          the bus being described by the vendor list.</P
><P
>The following bus attributes are supported:</P
><P
></P
><UL
><LI
><P
><TT
CLASS="literal"
>ata</TT
></P
></LI
><LI
><P
><TT
CLASS="literal"
>pci</TT
></P
></LI
><LI
><P
><TT
CLASS="literal"
>pcmcia</TT
></P
></LI
><LI
><P
><TT
CLASS="literal"
>scsi</TT
></P
></LI
><LI
><P
><TT
CLASS="literal"
>usb</TT
></P
></LI
></UL
></DIV
></DIV
><DIV
CLASS="section"
><HR><H2
CLASS="section"
><A
NAME="sc-vendor_element"
>4.2. The <CODE
CLASS="sgmltag"
>vendor</CODE
> element</A
></H2
><P
>A <CODE
CLASS="sgmltag"
>vendor</CODE
> element possesses two
        attributes, <CODE
CLASS="sgmltag"
>id</CODE
> and <CODE
CLASS="sgmltag"
>name</CODE
>, and
        contains no elements.</P
><DIV
CLASS="section"
><HR><H3
CLASS="section"
><A
NAME="sc-vendor_element_id_attribute"
>4.2.1. The <CODE
CLASS="sgmltag"
>id</CODE
> attribute</A
></H3
><P
>The <CODE
CLASS="sgmltag"
>id</CODE
> attribute is set to a bus-specific
          vendor identifier.</P
></DIV
><DIV
CLASS="section"
><HR><H3
CLASS="section"
><A
NAME="sc-vendor_element_name_attribute"
>4.2.2. The <CODE
CLASS="sgmltag"
>name</CODE
> attribute</A
></H3
><P
>The <CODE
CLASS="sgmltag"
>name</CODE
> attribute is set to a
          human-readable vendor identifier, typically the official name of
          the corporation or other business entity that designed or
          manufactured that peripheral.</P
></DIV
></DIV
></DIV
><DIV
CLASS="chapter"
><HR><H1
><A
NAME="ch-device_lists"
></A
>Chapter 5. Device Lists</H1
><P
>The device lists are the heart of <SPAN
CLASS="application"
>Discover</SPAN
>'s functionality.
      They are the most frequently updated lists and contain the
      information of greatest value.</P
><P
><SPAN
CLASS="application"
>Discover</SPAN
>'s device lists not only provide a way to identify
      individual peripherals by name, but also permit the specification of
      an arbitrary quantity of organized data for each device, supporting
      an arbitrary number of software interfaces.</P
><DIV
CLASS="note"
><P
></P
><TABLE
CLASS="note"
WIDTH="100%"
BORDER="0"
><TR
><TD
WIDTH="25"
ALIGN="CENTER"
VALIGN="TOP"
><IMG
SRC="http://www.progeny.com/images/utility/note.png"
HSPACE="5"
ALT="Note"></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
><P
>The following is a fictitious example.  The information
        within it is for illustrative purposes only.  See <A
HREF="#pt-data_content"
>Part II in <I
>The <SPAN
CLASS="application"
>Discover</SPAN
> Hardware Detection System</I
></A
> for a discussion of the
        <SPAN
CLASS="QUOTE"
>"real"</SPAN
> hardware data as provided by Progeny, and for
        some suggested conventions on organizing the data namespace.</P
></TD
></TR
></TABLE
></DIV
><DIV
CLASS="example"
><A
NAME="ex-sample_device_data"
></A
><P
><B
>Example 5-1. Sample device data</B
></P
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
WIDTH="100%"
><TR
><TD
><FONT
COLOR="#000000"
><PRE
CLASS="programlisting"
>&#60;?xml version="1.0"?&#62;

&#60;device_list bus="pci"&#62;
  &#60;device busclass="1984" model="0101" model_name="Cerebral Reprogrammer" vendor="B16B"&#62;
    &#60;data class="linux"&#62;
      &#60;data class="module"&#62;
        &#60;data class="name"&#62;winston&#60;/data&#62;
        &#60;data class="options"&#62;base_address=0x300 manual_override=0&#60;/data&#62;
      &#60;/data&#62;
    &#60;/data&#62;
    &#60;data class="win2k"&#62;
      &#60;data class="hal_driver"&#62;
        &#60;data class="StrUglyHungarianNotatedDriverName"&#62;settlement&#60;/data&#62;
        &#60;data class="flags"&#62;NSA_KEY=96b5f3e3283a62c85f6cb6f4017135c2&#60;/data&#62;
      &#60;/data&#62;
    &#60;/data&#62;
  &#60;/device&#62;
&#60;/device_list&#62;</PRE
></FONT
></TD
></TR
></TABLE
></DIV
><P
>The example above includes a <CODE
CLASS="sgmltag"
>device_list</CODE
>
      element containing <CODE
CLASS="sgmltag"
>device</CODE
> elements, and a
      <CODE
CLASS="sgmltag"
>device</CODE
> element that defines the device itself,
      but reserves any software- or interface-specific details to the
      <CODE
CLASS="sgmltag"
>data</CODE
> elements it contains.</P
><P
>The actual data provided in the example is accessed by means of
      data paths; see <A
HREF="#sc-accessing_device_data"
>Section 5.4</A
> for 
      further information.</P
><DIV
CLASS="section"
><HR><H2
CLASS="section"
><A
NAME="sc-device_list_element"
>5.1. The
        <CODE
CLASS="sgmltag"
>device_list</CODE
> element</A
></H2
><P
>A <CODE
CLASS="sgmltag"
>device_list</CODE
> element possesses a
        <CODE
CLASS="sgmltag"
>bus</CODE
> attribute and contains one or more
        <CODE
CLASS="sgmltag"
>device</CODE
> elements.</P
><DIV
CLASS="section"
><HR><H3
CLASS="section"
><A
NAME="sc-device_list_element_bus_attribute"
>5.1.1. The
          <CODE
CLASS="sgmltag"
>bus</CODE
> attribute</A
></H3
><P
>The <CODE
CLASS="sgmltag"
>bus</CODE
> attribute of the
          <CODE
CLASS="sgmltag"
>device_list</CODE
> element is set to the name of
          the bus described by the device list.</P
><P
>The following bus attributes are supported:</P
><P
></P
><UL
><LI
><P
><TT
CLASS="literal"
>ata</TT
></P
></LI
><LI
><P
><TT
CLASS="literal"
>pci</TT
></P
></LI
><LI
><P
><TT
CLASS="literal"
>pcmcia</TT
></P
></LI
><LI
><P
><TT
CLASS="literal"
>scsi</TT
></P
></LI
><LI
><P
><TT
CLASS="literal"
>usb</TT
></P
></LI
></UL
></DIV
></DIV
><DIV
CLASS="section"
><HR><H2
CLASS="section"
><A
NAME="sc-device_element"
>5.2. The <CODE
CLASS="sgmltag"
>device</CODE
> element</A
></H2
><P
>A <CODE
CLASS="sgmltag"
>device</CODE
> element possesses four attributes:</P
><P
></P
><UL
><LI
><P
><CODE
CLASS="sgmltag"
>busclass</CODE
></P
></LI
><LI
><P
><CODE
CLASS="sgmltag"
>vendor</CODE
></P
></LI
><LI
><P
><CODE
CLASS="sgmltag"
>model</CODE
></P
></LI
><LI
><P
><CODE
CLASS="sgmltag"
>model_name</CODE
></P
></LI
></UL
><P
>All of these attributes must be specified for each
        <CODE
CLASS="sgmltag"
>device</CODE
> element.  The <CODE
CLASS="sgmltag"
>busclass</CODE
>
        attribute is set to a <A
HREF="#sc-busclass_element_id_attribute"
>busclass
        identifier</A
>, <CODE
CLASS="sgmltag"
>vendor</CODE
> to a <A
HREF="#sc-vendor_element_id_attribute"
>vendor
        identifier</A
>, <CODE
CLASS="sgmltag"
>model</CODE
> to a bus-specific
        model identifier, and <CODE
CLASS="sgmltag"
>model_name</CODE
> to a
        human-readable vendor identifier, typically the name of the product
        under which the device reporting the <CODE
CLASS="sgmltag"
>model</CODE
>
        identifier is sold or otherwise distributed.</P
><P
>A <CODE
CLASS="sgmltag"
>device</CODE
> element contains zero or more
        <CODE
CLASS="sgmltag"
>data</CODE
> elements.</P
></DIV
><DIV
CLASS="section"
><HR><H2
CLASS="section"
><A
NAME="sc-data_element"
>5.3. The <CODE
CLASS="sgmltag"
>data</CODE
> element</A
></H2
><P
>A <CODE
CLASS="sgmltag"
>data</CODE
> element possesses a mandatory
        <CODE
CLASS="sgmltag"
>class</CODE
> attribute, an optional
        <CODE
CLASS="sgmltag"
>version</CODE
> attribute, and zero or more
        <CODE
CLASS="sgmltag"
>data</CODE
> elements.</P
><P
>The ability to nest <CODE
CLASS="sgmltag"
>data</CODE
> elements inside
        other <CODE
CLASS="sgmltag"
>data</CODE
> elements affords interface designers
        and device driver authors the ability to specify a hierarchy of
        data, instead of being compelled to encapsulate only one piece of
        data per device for their interface.</P
><DIV
CLASS="section"
><HR><H3
CLASS="section"
><A
NAME="sc-data_element_class_attribute"
>5.3.1. The <CODE
CLASS="sgmltag"
>class</CODE
> attribute</A
></H3
><P
>A <CODE
CLASS="sgmltag"
>class</CODE
> attribute is set to an arbitrary
          value determined by an interface designer.  For
          <CODE
CLASS="sgmltag"
>data</CODE
> elements whose parent element is a
          <CODE
CLASS="sgmltag"
>device</CODE
> element, this should be the name of
          the interface being described, such as
          <TT
CLASS="literal"
>freebsd</TT
>, <TT
CLASS="literal"
>linux</TT
>, or
          <TT
CLASS="literal"
>xfree86</TT
>.</P
><P
>A <CODE
CLASS="sgmltag"
>data</CODE
> element whose parent element is a
          <CODE
CLASS="sgmltag"
>data</CODE
> element should set this attribute to a
          term reflecting the interface designer's intended data hierarchy.
          <SPAN
CLASS="application"
>Discover</SPAN
> does not mandate any particular hierarchy for
          interface designers.</P
></DIV
><DIV
CLASS="section"
><HR><H3
CLASS="section"
><A
NAME="sc-data_element_version_attribute"
>5.3.2. The <CODE
CLASS="sgmltag"
>version</CODE
> attribute</A
></H3
><P
>Data elements have an optional attribute named <CODE
CLASS="sgmltag"
>version</CODE
>.  This indicates a version
          <EM
>range</EM
> applicable to the data contained
          within the element.  The purpose of this attribute is to permit
          the specification of data that is valid only for a range of
          versions of the given interface.  For example, the Linux kernel
          changed some of the names of its modules between the 2.2 and 2.4
          series.</P
><P
><SPAN
CLASS="application"
>Discover</SPAN
>'s range syntax, common in mathematical writings,
          is expressed as an interval; that is, it consists of a pair of
          endpoints with a comma between them, and brackets or parentheses
          as qualifiers for inclusion or exclusion of the endpoints' exact
          values.  For example, the version specification <TT
CLASS="literal"
>[1.0,
          2.0)</TT
> matches any version less than 2.0 and greater
          than or equal to 1.0.  It is the responsibility of the calling
          environment to specify the version of the interface actually in
          use.  In other words, the <SPAN
CLASS="application"
>Discover</SPAN
> library does not take it
          upon itself to determine the currently running version of the
          Linux kernel, XFree86 X server, CUPS printing daemon, and so
          forth.</P
><P
>Due to the lack of consistent standards for version numbers
          (in fact, some version numbers aren't numbers at all),
          <SPAN
CLASS="application"
>Discover</SPAN
> requires simplifications for the <CODE
CLASS="sgmltag"
>version</CODE
> attribute.  The versions that
          express the range must be in dotted-decimal form, such as
          <TT
CLASS="literal"
>7.1.0</TT
>.  The version that is supplied to the
          <SPAN
CLASS="application"
>Discover</SPAN
> library as part of a query (for example, via the
          <CODE
CLASS="option"
>--data-version</CODE
> argument to <B
CLASS="command"
>discover</B
>)
          may or may not comply with this requirement, but should
          be expressed such that it compares in a desirable way against
          version strings that do.</P
><P
>In place of the upper end of the range,
          <TT
CLASS="literal"
>inf</TT
> (infinity) can be used if the information
          is still relevant and should be for forseeable versions.</P
></DIV
></DIV
><DIV
CLASS="section"
><HR><H2
CLASS="section"
><A
NAME="sc-accessing_device_data"
>5.4. Accessing the Device
        Data</A
></H2
><P
><SPAN
CLASS="application"
>Discover</SPAN
> data is grouped into hierarchical <CODE
CLASS="sgmltag"
>data</CODE
> elements.  This data can be accessed
        via its data path.  The data path is the concatenation of the class
        attribute values of a <CODE
CLASS="sgmltag"
>data</CODE
>
        element and all its parents, separated by slash
        (<TT
CLASS="literal"
>/</TT
>) characters.  In the following example,
        <TT
CLASS="literal"
>quux</TT
> is accessed via the data path
        <SPAN
CLASS="QUOTE"
>"foo/bar"</SPAN
>:</P
><DIV
CLASS="informalexample"
><P
></P
><A
NAME="AEN580"
></A
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
WIDTH="100%"
><TR
><TD
><FONT
COLOR="#000000"
><PRE
CLASS="programlisting"
>&#60;data class="foo"&#62;
  &#60;data class="bar"&#62;quux&#60;/data&#62;
&#60;/data&#62;</PRE
></FONT
></TD
></TR
></TABLE
><P
></P
></DIV
><P
>In <A
HREF="#ex-sample_device_data"
>Example 5-1</A
> above, we would
        determine the name of the Linux kernel module
        (<SPAN
CLASS="QUOTE"
>"winston"</SPAN
>) for the <SPAN
CLASS="QUOTE"
>"Cerebral
        Reprogrammer"</SPAN
> device by referencing the data path
        <TT
CLASS="literal"
>linux/module/name</TT
>; similarly, the data path
        <TT
CLASS="literal"
>win2k/hal_driver/flags</TT
> returns
        <TT
CLASS="literal"
>NSA_KEY=96b5f3e3283a62c85f6cb6f4017135c2</TT
>.</P
></DIV
></DIV
></DIV
><DIV
CLASS="PART"
><A
NAME="pt-data_content"
></A
><DIV
CLASS="TITLEPAGE"
><H1
CLASS="title"
>II. Recommended Data Content Conventions</H1
><DIV
CLASS="PARTINTRO"
><A
NAME="AEN591"
></A
><P
>As discussed in the <A
HREF="#pr-what_is_discover"
>preface</A
>, <SPAN
CLASS="application"
>Discover</SPAN
> is not
      intended to be a replacement for system utilities such as
      <B
CLASS="command"
>lspci</B
> on Linux.  A
      <CODE
CLASS="sgmltag"
>device</CODE
> element should exist
      for a piece of hardware only if there is some interface information
      to communicate about the hardware; that is, some 
      <CODE
CLASS="sgmltag"
>data</CODE
> elements to house within the
      <CODE
CLASS="sgmltag"
>device</CODE
> element. This part of the
      manual contains Progeny's recommendations on how to organize that
      information for maximum utility.</P
></DIV
><DIV
CLASS="TOC"
><DL
><DT
><B
>Table of Contents</B
></DT
><DT
>6. <A
HREF="#ch-data_hierarchy"
>Data Hierarchy</A
></DT
><DD
><DL
><DT
>6.1. <A
HREF="#sc-linux_kernel_modules"
>Linux Kernel Modules</A
></DT
><DT
>6.2. <A
HREF="#sc-xfree86_x_servers"
>XFree86 X Servers</A
></DT
><DT
>6.3. <A
HREF="#sc-locally-defined_interfaces"
>Locally-Defined Interfaces</A
></DT
></DL
></DD
><DT
>7. <A
HREF="#ch-order-matters"
>Why Order Matters</A
></DT
><DT
>8. <A
HREF="#ch-using_data_versioning"
>Using Data Versioning</A
></DT
><DD
><DL
><DT
>8.1. <A
HREF="#sc-specifying_range"
>Specifying a Range</A
></DT
><DT
>8.2. <A
HREF="#sc-how_discover_library_matches_range"
>How the <SPAN
CLASS="application"
>Discover</SPAN
> Library Matches a Range</A
></DT
></DL
></DD
></DL
></DIV
></DIV
><DIV
CLASS="chapter"
><HR><H1
><A
NAME="ch-data_hierarchy"
></A
>Chapter 6. Data Hierarchy</H1
><P
>As discussed in <A
HREF="#sc-accessing_device_data"
>Section 5.4</A
>, the
      <ACRONYM
CLASS="acronym"
>XML</ACRONYM
> structure around the data allows for a hierarchical
      view.</P
><P
>While <SPAN
CLASS="application"
>Discover</SPAN
> does not mandate any particular hierarchy or
      namespace organization for <CODE
CLASS="sgmltag"
>data</CODE
>
      elements, the <ACRONYM
CLASS="acronym"
>XML</ACRONYM
> files provided by Progeny express &#8212; and
      some applications based on <SPAN
CLASS="application"
>Discover</SPAN
> (such as
      <B
CLASS="command"
>discover-modprobe</B
>) expect &#8212; a certain
      structure for Linux kernel module and XFree86 configuration
      information.</P
><P
>At Progeny, we have often found it convenient to refer to a
      top-level <CODE
CLASS="sgmltag"
>data</CODE
> element's <CODE
CLASS="sgmltag"
>class</CODE
> attribute value as an
      <SPAN
CLASS="QUOTE"
>"interface"</SPAN
> (see the following example).</P
><DIV
CLASS="example"
><A
NAME="ex-defining_an_interface"
></A
><P
><B
>Example 6-1. Defining an interface</B
></P
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
WIDTH="100%"
><TR
><TD
><FONT
COLOR="#000000"
><PRE
CLASS="programlisting"
>&#60;device busclass="0300" vendor="de8d" model="90a9" model_name="Stingray"&#62;
  &#60;data class="xfree86"&#62;
    &#60;data class="server" version="[3, 4)"&#62;
      &#60;data class="name"&#62;XF86_SVGA&#60;/data&#62;
    &#60;/data&#62;
  &#60;/data&#62;
  &#60;data class="openbsd"&#62;
    &#60;data class="security_level"&#62;untrusted&#60;/data&#62;
  &#60;/data&#62;
&#60;/device&#62;</PRE
></FONT
></TD
></TR
></TABLE
></DIV
><P
>In <A
HREF="#ex-defining_an_interface"
>Example 6-1</A
>, two interfaces
      have been defined for the <SPAN
CLASS="QUOTE"
>"Stingray"</SPAN
> device:
      <TT
CLASS="literal"
>xfree86</TT
> and <TT
CLASS="literal"
>openbsd</TT
>.</P
><DIV
CLASS="section"
><HR><H2
CLASS="section"
><A
NAME="sc-linux_kernel_modules"
>6.1. Linux Kernel Modules</A
></H2
><P
>A hardware device that requires a particular Linux kernel
        module should have nested <CODE
CLASS="sgmltag"
>data</CODE
>
        elements to describe that module.  The top-level <CODE
CLASS="sgmltag"
>data</CODE
> element should have a <CODE
CLASS="sgmltag"
>class</CODE
> attribute with a value of
        <CODE
CLASS="sgmltag"
>linux</CODE
>.  Underneath that should
        be a <CODE
CLASS="sgmltag"
>data</CODE
> element with a
        <CODE
CLASS="sgmltag"
>class</CODE
> of <CODE
CLASS="sgmltag"
>module</CODE
>.</P
><P
>Within that <CODE
CLASS="sgmltag"
>data</CODE
> element,
        there should be one or two more, one with a <CODE
CLASS="sgmltag"
>class</CODE
> of <CODE
CLASS="sgmltag"
>name</CODE
>, and an optional one with a
        <CODE
CLASS="sgmltag"
>class</CODE
> of <CODE
CLASS="sgmltag"
>options</CODE
>.  The former has as content the
        name of the module; the latter, options to be passed to
        <B
CLASS="command"
>modprobe</B
>.</P
><DIV
CLASS="figure"
><A
NAME="fg-linux_interface"
></A
><P
><B
>Figure 6-1. Linux interface</B
></P
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
WIDTH="100%"
><TR
><TD
><FONT
COLOR="#000000"
><PRE
CLASS="screen"
>/linux
    |
    |-/module
          |
          |-/name
          |
          |-/options</PRE
></FONT
></TD
></TR
></TABLE
></DIV
><P
>In <A
HREF="#fg-linux_interface"
>Figure 6-1</A
>, each component of
        the tree represents a <CODE
CLASS="sgmltag"
>data</CODE
>
        element; the label is the value of its <CODE
CLASS="sgmltag"
>class</CODE
> attribute.</P
><P
>If the kernel version affects the choice of module name or
        options, the top-level <CODE
CLASS="sgmltag"
>linux</CODE
>
        <CODE
CLASS="sgmltag"
>data</CODE
> element should have a
        version range attribute; see <A
HREF="#sc-data_element_version_attribute"
>Section 5.3.2</A
>.</P
><DIV
CLASS="example"
><A
NAME="ex-using_linux_interface"
></A
><P
><B
>Example 6-2. Using the <CODE
CLASS="sgmltag"
>linux</CODE
> interface</B
></P
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
WIDTH="100%"
><TR
><TD
><FONT
COLOR="#000000"
><PRE
CLASS="programlisting"
>&#60;device busclass="0204" model="1702" model_name="IS64PH ISDN Adapter" vendor="0675"&#62;
  &#60;data class="linux"&#62;
    &#60;data class="module"&#62;
       &#60;data class="name"&#62;hisax&#60;/data&#62;
       &#60;data class="options"&#62;io=0x300 irq=11&#60;/data&#62;
    &#60;/data&#62;
  &#60;/data&#62;
&#60;/device&#62;</PRE
></FONT
></TD
></TR
></TABLE
></DIV
><P
>See <A
HREF="#ex-using_version_attribute_of_data_element"
>Example 8-1</A
> for guidance
        on how to specify different Linux kernel modules for the same
        device, depending on the version of the Linux kernel in use.</P
></DIV
><DIV
CLASS="section"
><HR><H2
CLASS="section"
><A
NAME="sc-xfree86_x_servers"
>6.2. XFree86 X Servers</A
></H2
><P
>The data hierarchy of a video card device (<SPAN
CLASS="application"
>Discover</SPAN
>'s
        <TT
CLASS="literal"
>display</TT
> type) should include a top-level
        <CODE
CLASS="sgmltag"
>data</CODE
> element with a <CODE
CLASS="sgmltag"
>class</CODE
> attribute of <CODE
CLASS="sgmltag"
>xfree86</CODE
> (the interface)
        and likely with a <CODE
CLASS="sgmltag"
>version</CODE
>
        attribute as well; nested within that element will be a <CODE
CLASS="sgmltag"
>server</CODE
> <CODE
CLASS="sgmltag"
>data</CODE
> element containing a <CODE
CLASS="sgmltag"
>name</CODE
> <CODE
CLASS="sgmltag"
>data</CODE
> element identifying the name of the
        server executable.  For XFree86 version 4.0 or greater, the
        <CODE
CLASS="sgmltag"
>name</CODE
> will always be <CODE
CLASS="sgmltag"
>XFree86</CODE
>, and the <CODE
CLASS="sgmltag"
>server</CODE
> <CODE
CLASS="sgmltag"
>data</CODE
> element will also contain a <CODE
CLASS="sgmltag"
>device</CODE
> <CODE
CLASS="sgmltag"
>data</CODE
> element, which contains one or more
        <CODE
CLASS="sgmltag"
>data</CODE
> elements communicating
        information to be stored in the <TT
CLASS="filename"
>XF86Config</TT
>
        file.  The children of the <CODE
CLASS="sgmltag"
>device</CODE
> <CODE
CLASS="sgmltag"
>data</CODE
> element are named in correspondence
        with the syntax of the <TT
CLASS="filename"
>XF86Config</TT
> file's
        <TT
CLASS="literal"
>Device</TT
> section; see the <A
HREF="http://www.xfree86.org/current/XF86Config.5.html"
TARGET="_top"
>XF86Config
        manual page</A
> for further information.  In particular, note
        that in many cases only a
        <CODE
CLASS="sgmltag"
>driver</CODE
> <CODE
CLASS="sgmltag"
>data</CODE
> element is necessary.</P
><DIV
CLASS="figure"
><A
NAME="fg-xfree86_interface"
></A
><P
><B
>Figure 6-2. XFree86 interface</B
></P
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
WIDTH="100%"
><TR
><TD
><FONT
COLOR="#000000"
><PRE
CLASS="screen"
>/xfree86
    |
    |-/server
          |
          |-/name
          |
          |-/device
                |
                |-/driver
                |
                |-/chipid
                |
                |-/chipset
                |
                |-/ramdac
                |
                |-/dacspeed
                |
                |-/videoram
                |
                |-/options
                |
                |-...</PRE
></FONT
></TD
></TR
></TABLE
></DIV
><P
><A
HREF="#fg-xfree86_interface"
>Figure 6-2</A
> illustrates the
        <CODE
CLASS="sgmltag"
>xfree86</CODE
>
        interface.  <A
HREF="#ex-using_xfree86_interface"
>Example 6-3</A
> shows
        how you might write <CODE
CLASS="sgmltag"
>xfree86</CODE
>
        interface information for a <SPAN
CLASS="application"
>Discover</SPAN
> <CODE
CLASS="sgmltag"
>display</CODE
> device.</P
><DIV
CLASS="example"
><A
NAME="ex-using_xfree86_interface"
></A
><P
><B
>Example 6-3. Using the <CODE
CLASS="sgmltag"
>xfree86</CODE
> interface</B
></P
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
WIDTH="100%"
><TR
><TD
><FONT
COLOR="#000000"
><PRE
CLASS="programlisting"
>&#60;device busclass="0300" vendor="1002" model="4654" model_name="Mach64 VT [264VT FT]"&#62;
  &#60;data class="xfree86"&#62;
    &#60;data class="server" version="[4, inf)"&#62;
      &#60;data class="name"&#62;XFree86&#60;/data&#62;
      &#60;data class="device"&#62;
        &#60;data class="driver"&#62;ati&#60;/data&#62;
      &#60;/data&#62;
    &#60;/data&#62;
    &#60;data class="server" version="(0, 4)"&#62;
      &#60;data class="name"&#62;XF86_Mach64&#60;/data&#62;
    &#60;/data&#62;
  &#60;/data&#62;
&#60;/device&#62;</PRE
></FONT
></TD
></TR
></TABLE
></DIV
></DIV
><DIV
CLASS="section"
><HR><H2
CLASS="section"
><A
NAME="sc-locally-defined_interfaces"
>6.3. Locally-Defined Interfaces</A
></H2
><P
>Progeny recommends that publicly distributed <SPAN
CLASS="application"
>Discover</SPAN
>
          <ACRONYM
CLASS="acronym"
>XML</ACRONYM
> files avoid using the interface name
          <TT
CLASS="literal"
>local</TT
>; that is, a
          <CODE
CLASS="sgmltag"
>class</CODE
> attribute value of
          <TT
CLASS="literal"
>local</TT
> in a top-level
          <CODE
CLASS="sgmltag"
>data</CODE
> element.  This
          means that data paths such as <TT
CLASS="literal"
>local/foo/bar</TT
>
          should not be defined in a public <SPAN
CLASS="application"
>Discover</SPAN
> <ACRONYM
CLASS="acronym"
>XML</ACRONYM
> file, but
          both <TT
CLASS="literal"
>foo/bar/local</TT
> and
          <TT
CLASS="literal"
>foo/local/bar</TT
> are okay.</P
><P
>The intention is to reserve this part of the namespace
          for users' experiments with defining their own &#8212;
          and possibly future, widely adopted &#8212; interface definitions
          for <SPAN
CLASS="application"
>Discover</SPAN
> data.  An interface definition could thus be
          <SPAN
CLASS="QUOTE"
>"beta tested"</SPAN
> by a person or organization to ensure
          that it is efficiently structured before it is unleashed upon the
          world elsewhere in the namespace, where people may write tools
          that expect to be able to resolve the interface definition's data
          paths.</P
><P
>Likewise, Progeny recommends that authors of applications
          that use <SPAN
CLASS="application"
>Discover</SPAN
> avoid traversing into a top-level
          <TT
CLASS="literal"
>local</TT
> <CODE
CLASS="sgmltag"
>data</CODE
>
          element, which may impose an undesirable support burden on
          the designers of the interface while they are still working out
          their design.  (The application also may not find the data it
          desires, or may not get back what it expects.)</P
></DIV
></DIV
><DIV
CLASS="chapter"
><HR><H1
><A
NAME="ch-order-matters"
></A
>Chapter 7. Why Order Matters</H1
><P
>When searching device elements, the first exact match will be
      selected.  Subsequent matches are ignored.
      </P
><P
>Specifically, three comparisons are made:</P
><P
></P
><OL
TYPE="1"
><LI
><P
>The hardware must provide identification that matches
          attributes of the <CODE
CLASS="sgmltag"
>device</CODE
> element.  As an
          example, a <ACRONYM
CLASS="acronym"
>PCI</ACRONYM
> device supplies numeric vendor and model
          identifiers, which are used to match the
          <CODE
CLASS="sgmltag"
>model</CODE
> and <CODE
CLASS="sgmltag"
>vendor</CODE
>
          attributes.</P
></LI
><LI
><P
>The <CODE
CLASS="sgmltag"
>class</CODE
> attributes of child
          <CODE
CLASS="sgmltag"
>data</CODE
> elements must match the data path as
          given to the library for searching.</P
></LI
><LI
><P
>The first version range, if any, associated with the nested
          <CODE
CLASS="sgmltag"
>data</CODE
> elements must encompass any
          version provided by the client.</P
></LI
></OL
><DIV
CLASS="example"
><A
NAME="AEN737"
></A
><P
><B
>Example 7-1. Matching <CODE
CLASS="sgmltag"
>device</CODE
> elements</B
></P
><P
>Assume that the path <TT
CLASS="literal"
>linux/module/name</TT
> is
        provided, along with a version of 2.4.2.  The following is sample
        data; the <CODE
CLASS="sgmltag"
>device</CODE
> elements may be from the same
        or different data files.</P
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
WIDTH="100%"
><TR
><TD
><FONT
COLOR="#000000"
><PRE
CLASS="programlisting"
>&#13;&#60;device busclass="0000" vendor="102f" model="5555" model_name="100VG ethernet"&#62;
  &#60;data class="linux" version="[2.4, inf)"&#62;<A
NAME="bad_name"
><IMG
SRC="http://www.progeny.com/images/utility/callouts/1.gif"
HSPACE="0"
VSPACE="0"
BORDER="0"
ALT="(1)"></A
>
    &#60;data class="modules"&#62;
        &#60;data class="name"&#62;vg100&#60;/data&#62;
    &#60;/data&#62;
  &#60;/data&#62;
  &#60;data class="linux" version="[2.0, 2.2)"&#62;<A
NAME="range_20to22"
><IMG
SRC="http://www.progeny.com/images/utility/callouts/2.gif"
HSPACE="0"
VSPACE="0"
BORDER="0"
ALT="(2)"></A
>
    &#60;data class="module"&#62;
        &#60;data class="name"&#62;vg100&#60;/data&#62;
        &#60;data class="options"&#62;io=0x300&#60;/data&#62;
    &#60;/data&#62;
  &#60;/data&#62;
&#60;/device&#62;

&#60;device busclass="0000" vendor="102f" model="5555" model_name="100VG ethernet"&#62;
  &#60;data class="linux"&#62;<A
NAME="blank_range"
><IMG
SRC="http://www.progeny.com/images/utility/callouts/3.gif"
HSPACE="0"
VSPACE="0"
BORDER="0"
ALT="(3)"></A
>
    &#60;data class="module"&#62;
        &#60;data class="name"&#62;vg100new&#60;/data&#62;
    &#60;/data&#62;
  &#60;/data&#62;
  &#60;data class="linux" version="[2.4, inf)"&#62;<A
NAME="range_24toinf"
><IMG
SRC="http://www.progeny.com/images/utility/callouts/4.gif"
HSPACE="0"
VSPACE="0"
BORDER="0"
ALT="(4)"></A
>
    &#60;data class="module"&#62;
        &#60;data class="name"&#62;vg100old&#60;/data&#62;
    &#60;/data&#62;
  &#60;/data&#62;
&#60;/device&#62;

</PRE
></FONT
></TD
></TR
></TABLE
><DIV
CLASS="calloutlist"
><DL
COMPACT="COMPACT"
><DT
><A
HREF="#bad_name"
><IMG
SRC="http://www.progeny.com/images/utility/callouts/1.gif"
HSPACE="0"
VSPACE="0"
BORDER="0"
ALT="(1)"></A
></DT
><DD
>This item is the first one scanned, and would match,
            except that the requested data path includes
            <SPAN
CLASS="QUOTE"
>"module"</SPAN
> as a component, not
            <SPAN
CLASS="QUOTE"
>"modules"</SPAN
> as specified here.</DD
><DT
><A
HREF="#range_20to22"
><IMG
SRC="http://www.progeny.com/images/utility/callouts/2.gif"
HSPACE="0"
VSPACE="0"
BORDER="0"
ALT="(2)"></A
></DT
><DD
>This item doesn't match because the provided range is
            outside the limits defined by the element. (2.4.2 is not
            greater than or equal to 2.0 and less than 2.2.)</DD
><DT
><A
HREF="#blank_range"
><IMG
SRC="http://www.progeny.com/images/utility/callouts/3.gif"
HSPACE="0"
VSPACE="0"
BORDER="0"
ALT="(3)"></A
></DT
><DD
>This item matches because no range is given, so
            <SPAN
CLASS="QUOTE"
>"vg100new"</SPAN
> is the value returned.</DD
><DT
><A
HREF="#range_24toinf"
><IMG
SRC="http://www.progeny.com/images/utility/callouts/4.gif"
HSPACE="0"
VSPACE="0"
BORDER="0"
ALT="(4)"></A
></DT
><DD
>This is the nearest match, but the <SPAN
CLASS="application"
>Discover</SPAN
> library
            will never select it because its previous sibling has no
            version range, and thus will catch any version provided.</DD
></DL
></DIV
></DIV
></DIV
><DIV
CLASS="chapter"
><HR><H1
><A
NAME="ch-using_data_versioning"
></A
>Chapter 8. Using Data Versioning</H1
><DIV
CLASS="section"
><H2
CLASS="section"
><A
NAME="sc-specifying_range"
>8.1. Specifying a Range</A
></H2
><P
>Because multiple versions of a software interface often are
        in simultaneous deployment, Progeny recommendeds that the upper
        bound of a <CODE
CLASS="sgmltag"
>data</CODE
> element's
        <CODE
CLASS="sgmltag"
>version</CODE
> attribute be defined
        as the first version that is inconsistent with the information
        provided within it, and that the upper end of the interval be open
        (terminated with a parenthesis).  As an example, suppose we know
        that the name of the Linux kernel module to drive the RealTek
        RTL-8139 Ethernet device was <TT
CLASS="literal"
>rtl8139</TT
> in the 2.2
        kernel series and <TT
CLASS="literal"
>8139too</TT
> in the 2.4 series.  To
        express this, we would say the following:</P
><DIV
CLASS="example"
><A
NAME="ex-using_version_attribute_of_data_element"
></A
><P
><B
>Example 8-1. Using the
          <CODE
CLASS="sgmltag"
>version</CODE
> attribute of the
          <CODE
CLASS="sgmltag"
>data</CODE
> element</B
></P
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
WIDTH="100%"
><TR
><TD
><FONT
COLOR="#000000"
><PRE
CLASS="programlisting"
>&#60;device_list bus="pci"&#62;
&#60;device busclass="0200" model="8139" model_name="RTL-8139" vendor="10ec"&#62;
  &#60;data class="linux" version="[2.4,inf)"&#62;
    &#60;data class="module"&#62;
       &#60;data class="name"&#62;8139too&#60;/data&#62;
    &#60;/data&#62;
  &#60;/data&#62;
  &#60;data class="linux" version="[2.2,2.4)"&#62;
    &#60;data class="module"&#62;
       &#60;data class="name"&#62;rtl8139&#60;/data&#62;
    &#60;/data&#62;
  &#60;/data&#62;
&#60;/device&#62;
&#60;/device_list&#62;</PRE
></FONT
></TD
></TR
></TABLE
></DIV
><P
>In the first data element, for instance, we would not use a
        version attribute of <TT
CLASS="literal"
>[2.2.0,2.2.19]</TT
> because it is needlessly specific.  What happens if the Linux kernel
        developers release Linux kernel 2.2.20?  By saying
        <TT
CLASS="literal"
>[2.2,2.4)</TT
>, we <SPAN
CLASS="QUOTE"
>"catch"</SPAN
> everything in
        the kernel 2.2 series<A
NAME="AEN779"
HREF="#FTN.AEN779"
><SPAN
CLASS="footnote"
>[2]</SPAN
></A
> &#8212; past,
        present, and future.</P
></DIV
><DIV
CLASS="section"
><HR><H2
CLASS="section"
><A
NAME="sc-how_discover_library_matches_range"
>8.2. How the <SPAN
CLASS="application"
>Discover</SPAN
> Library Matches a Range</A
></H2
><P
>The data files will be searched in order; the first data path
        that matches the version range or doesn't have a version range will
        be returned.</P
><P
>Recalling the discussion in <A
HREF="#sc-data_element_version_attribute"
>Section 5.3.2</A
>, if you want the
        first data element matching the requested data path to also be the
        <SPAN
CLASS="QUOTE"
>"fallback"</SPAN
> element if no version range applies, you
        can duplicate that data element and place it at the end.  However,
        a better practice is to make certain that all reasonable versions
        will match one of the ranges, and that the first range listed has
        an open-ended high end, such as <TT
CLASS="literal"
>[2.4, inf)</TT
> for
        Linux kernel modules in
        <A
HREF="#ex-using_version_attribute_of_data_element"
>Example 8-1</A
>.  This
        will have the effect of <SPAN
CLASS="QUOTE"
>"assuming"</SPAN
> that
        all unversioned requests for <TT
CLASS="literal"
>linux</TT
> data will be
        for Linux kernel 2.4 or later.</P
></DIV
></DIV
></DIV
><DIV
CLASS="PART"
><A
NAME="pt-command-line_tools"
></A
><DIV
CLASS="TITLEPAGE"
><H1
CLASS="title"
>III. Command-Line Tools</H1
><DIV
CLASS="TOC"
><DL
><DT
><B
>Table of Contents</B
></DT
><DT
>9. <A
HREF="#ch-discover_manpage"
><B
CLASS="command"
>discover</B
> Manual Page</A
></DT
><DD
><DL
><DT
><A
HREF="#AEN798"
>discover</A
>&nbsp;--&nbsp;hardware detection utility</DT
></DL
></DD
><DT
>10. <A
HREF="#ch-discover-conf_manpage"
><TT
CLASS="filename"
>discover.conf</TT
> Manual Page</A
></DT
><DD
><DL
><DT
><A
HREF="#AEN1223"
>discover.conf</A
>&nbsp;--&nbsp;configuration file format for discover(1)</DT
></DL
></DD
><DT
>11. <A
HREF="#ch-discover-modprobe_manpage"
><B
CLASS="command"
>discover-modprobe</B
>
      Manual Page</A
></DT
><DD
><DL
><DT
><A
HREF="#AEN1270"
>discover-modprobe</A
>&nbsp;--&nbsp;kernel module loading using discover(1)</DT
></DL
></DD
><DT
>12. <A
HREF="#ch-discover-modprobe-conf_manpage"
><TT
CLASS="filename"
>discover-modprobe.conf</TT
>
      Manual Page</A
></DT
><DD
><DL
><DT
><A
HREF="#AEN1333"
>discover-modprobe.conf</A
>&nbsp;--&nbsp;configuration file for discover-modprobe(5)</DT
></DL
></DD
></DL
></DIV
></DIV
><DIV
CLASS="chapter"
><HR><H1
><A
NAME="ch-discover_manpage"
></A
>Chapter 9. <B
CLASS="command"
>discover</B
> Manual Page</H1
><H1
><A
NAME="AEN798"
></A
>discover</H1
><DIV
CLASS="refnamediv"
><A
NAME="AEN812"
></A
><H2
>Name</H2
>discover&nbsp;--&nbsp;hardware detection utility</DIV
><DIV
CLASS="refsynopsisdiv"
><A
NAME="AEN815"
></A
><H2
>Synopsis</H2
><P
><B
CLASS="command"
>discover</B
>  [DATA_OPTIONS] [DISPLAY_OPTIONS] [--bus-summary] [bus...]</P
><P
><B
CLASS="command"
>discover</B
>  [DATA_OPTIONS] [DISPLAY_OPTIONS]  --type-summary  [type...]</P
><P
><B
CLASS="command"
>discover</B
>  [DATA_OPTIONS]  --data-path=<TT
CLASS="replaceable"
><I
>path/to/data</I
></TT
>...  [--data-version=<TT
CLASS="replaceable"
><I
>version</I
></TT
>] [--normalize-whitespace] [--format=<TT
CLASS="replaceable"
><I
>format string</I
></TT
>] [type | id...]</P
><P
></P
><DIV
CLASS="variablelist"
><DL
><DT
>DATA_OPTIONS</DT
><DD
><P
></P
><UL
><LI
><P
><CODE
CLASS="option"
>-d | --disable-bus=<TT
CLASS="replaceable"
><I
>bus</I
></TT
></CODE
></P
></LI
><LI
><P
><CODE
CLASS="option"
>-e | --enable-bus=<TT
CLASS="replaceable"
><I
>bus</I
></TT
></CODE
></P
></LI
><LI
><P
><CODE
CLASS="option"
>--insert-url=<TT
CLASS="replaceable"
><I
>url</I
></TT
></CODE
></P
></LI
><LI
><P
><CODE
CLASS="option"
>--append-url=<TT
CLASS="replaceable"
><I
>url</I
></TT
></CODE
></P
></LI
><LI
><P
><CODE
CLASS="option"
>-v | --verbose</CODE
></P
></LI
></UL
></DD
><DT
>DISPLAY_OPTIONS</DT
><DD
><P
></P
><UL
><LI
><P
><CODE
CLASS="option"
>--model | --no-model</CODE
></P
></LI
><LI
><P
><CODE
CLASS="option"
>--model-id | --no-model-id</CODE
></P
></LI
><LI
><P
><CODE
CLASS="option"
>--vendor | --no-vendor</CODE
></P
></LI
><LI
><P
><CODE
CLASS="option"
>--vendor-id | --no-vendor-id</CODE
></P
></LI
></UL
></DD
></DL
></DIV
></DIV
><DIV
CLASS="refsect1"
><A
NAME="d1-rs-description"
></A
><H2
>Description</H2
><P
><B
CLASS="command"
>discover</B
> provides an extensible hardware
    detection and reporting interface. Hardware information is stored in an
    <ACRONYM
CLASS="acronym"
>XML</ACRONYM
> data format and can be retrieved across the network.</P
><P
>Fundamental modes of operation:</P
><P
></P
><UL
><LI
><P
>Display a list of hardware devices based on type of device or
          system bus on which the devices reside, via
          <CODE
CLASS="option"
>--type-summary</CODE
> or
          <CODE
CLASS="option"
>--bus-summary</CODE
> (the latter of which is the
          default behavior).
          
        </P
></LI
><LI
><P
>Query specified data for attached hardware, via
          <CODE
CLASS="option"
>--data-path</CODE
>.</P
></LI
></UL
></DIV
><DIV
CLASS="refsect1"
><A
NAME="d1-rs-options"
></A
><H2
>Options</H2
><P
></P
><DIV
CLASS="variablelist"
><DL
><DT
><CODE
CLASS="option"
>-h | --help</CODE
></DT
><DD
><P
>Display a simple help message.</P
></DD
><DT
><CODE
CLASS="option"
>-v | --verbose</CODE
></DT
><DD
><P
>Instruct the tool to provide feedback as it operates. This
          will affect the output as <B
CLASS="command"
>discover</B
> parses certain
          arguments, so this should appear early in the command line.</P
></DD
><DT
><CODE
CLASS="option"
>-V | --version</CODE
></DT
><DD
><P
>Display the tool name and version.</P
></DD
><DT
><CODE
CLASS="option"
>-b | --bus-summary</CODE
></DT
><DD
><P
>This is the default behavior: Display basic information
          regarding all devices on the appropriate buses. See
          <A
HREF="#d1-rs-bus-selection"
><I
>Selecting Buses</I
></A
>.</P
></DD
><DT
><CODE
CLASS="option"
>-t | --type-summary</CODE
></DT
><DD
><P
>Summarize devices by class of hardware. Examples of valid
          device types include <TT
CLASS="literal"
>broadband</TT
>,
          <TT
CLASS="literal"
>fixeddisk</TT
>,
          <TT
CLASS="literal"
>display</TT
>, and
          <TT
CLASS="literal"
>network</TT
>.  See <A
HREF="#d1-rs-device-types"
><I
>Device Types</I
></A
>.</P
></DD
><DT
><CODE
CLASS="option"
>--data-path=<TT
CLASS="replaceable"
><I
>path/to/data</I
></TT
></CODE
></DT
><DD
><P
>Query matching devices for detailed information.
          Device-specific data is stored in a hierarchical
          fashion, and the query argument comprises strings
          naming each level in that hierarchy.</P
><P
>Typically, the top-level component of the data
          path will be the <SPAN
CLASS="QUOTE"
>"platform"</SPAN
> that will need
          the information, such as <TT
CLASS="literal"
>linux</TT
> or
          <TT
CLASS="literal"
>xfree86</TT
>. For example, to retrieve
          the Linux kernel module name for a piece of hardware,
          the <CODE
CLASS="option"
>--data-path</CODE
> argument would be
          <TT
CLASS="literal"
>linux/module/name</TT
>.</P
><P
>If multiple <CODE
CLASS="option"
>--data-path</CODE
>
          arguments are given and no format string (see
          <CODE
CLASS="option"
>--format</CODE
>) is provided, only the last
          path is used.</P
><P
>See also the <CODE
CLASS="option"
>--data-version</CODE
>
          argument.</P
></DD
><DT
><CODE
CLASS="option"
>--data-version=<TT
CLASS="replaceable"
><I
>version</I
></TT
></CODE
></DT
><DD
><P
>Specify a version string for the platform that
          will use the information specified by the argument to
          <CODE
CLASS="option"
>--data-path</CODE
>.</P
><P
>This string must be in dotted-decimal notation in
          order to be matched against a range of values, and thus
          may be shorter than the real version.</P
></DD
><DT
><CODE
CLASS="option"
>--format=<TT
CLASS="replaceable"
><I
>format string</I
></TT
></CODE
></DT
><DD
><P
>Dictate the output of the results of the queries
          specified by <CODE
CLASS="option"
>--data-path</CODE
> arguments.
          This format string should follow
          <CODE
CLASS="function"
>printf(3)</CODE
> specifications, although
          only <TT
CLASS="literal"
>%s</TT
> and appropriate flags,
          precision, and width values are supported (or
          make sense); literal text and <TT
CLASS="literal"
>%%</TT
>
          can also be used.  The behavior when the string is
          poorly formatted is undefined.  See also
          <CODE
CLASS="option"
>--normalize-whitespace</CODE
>.</P
></DD
><DT
><CODE
CLASS="option"
>-d | --disable-bus=<TT
CLASS="replaceable"
><I
>bus</I
></TT
></CODE
></DT
><DD
><P
>Use this option to override the list of
          buses to scan by default as defined in
          <TT
CLASS="filename"
>discover.conf</TT
>. Use
          <TT
CLASS="replaceable"
><I
>all</I
></TT
> as an argument to
          disable all buses; this is useful only if
          followed by
          <CODE
CLASS="option"
>--enable-bus</CODE
> (or <CODE
CLASS="option"
>-e</CODE
>)
          arguments.</P
></DD
><DT
><CODE
CLASS="option"
>-e | --enable-bus=<TT
CLASS="replaceable"
><I
>bus</I
></TT
></CODE
></DT
><DD
><P
>Specify a bus to be scanned.</P
></DD
><DT
><CODE
CLASS="option"
>--insert-url=<TT
CLASS="replaceable"
><I
>url</I
></TT
></CODE
></DT
><DD
><P
>Insert a <ACRONYM
CLASS="acronym"
>URL</ACRONYM
> at the head of
          the list of network resources to include in the search
          for hardware information.  Earlier data overrides
          later data; to override the local data
          sources, insert URLs into the list.  See also
          <CODE
CLASS="option"
>--append-url</CODE
>.</P
></DD
><DT
><CODE
CLASS="option"
>--append-url=<TT
CLASS="replaceable"
><I
>url</I
></TT
></CODE
></DT
><DD
><P
>Append a <ACRONYM
CLASS="acronym"
>URL</ACRONYM
> to the end of the
          list of network resources to search for
          hardware information. See also
          <CODE
CLASS="option"
>--insert-url</CODE
>.</P
></DD
><DT
><CODE
CLASS="option"
>--model</CODE
></DT
><DD
><P
>Include the model description in summary
          information. This is enabled by default.</P
></DD
><DT
><CODE
CLASS="option"
>--model-id</CODE
></DT
><DD
><P
>Include the numeric model identifier in summary
          information.</P
></DD
><DT
><CODE
CLASS="option"
>--no-model</CODE
></DT
><DD
><P
>Do not include the model description in summary
          information.</P
></DD
><DT
><CODE
CLASS="option"
>--no-model-id</CODE
></DT
><DD
><P
>Do not include the numeric model identifier in summary
          information. This is the default.</P
></DD
><DT
><CODE
CLASS="option"
>--vendor</CODE
></DT
><DD
><P
>Include the vendor description in summary
          information. This is enabled by default.</P
></DD
><DT
><CODE
CLASS="option"
>--vendor-id</CODE
></DT
><DD
><P
>Include the numeric vendor identifier in summary
          information.</P
></DD
><DT
><CODE
CLASS="option"
>--no-vendor</CODE
></DT
><DD
><P
>Do not include the vendor description in summary
          information.</P
></DD
><DT
><CODE
CLASS="option"
>--no-vendor-id</CODE
></DT
><DD
><P
>Do not include the numeric vendor identifier in summary
          information. This is the default.</P
></DD
><DT
><CODE
CLASS="option"
>--normalize-whitespace</CODE
></DT
><DD
><P
>Consolidate whitespace in the results of a
          <CODE
CLASS="option"
>--data-path</CODE
> query.  The default is not to do so,
          which faithfully reproduces all text in the raw <ACRONYM
CLASS="acronym"
>XML</ACRONYM
> data.</P
><P
>With this option enabled, leading and trailing whitespace
          is removed, and any consecutive internal whitespaces are
          compressed to a single space character.</P
></DD
></DL
></DIV
></DIV
><DIV
CLASS="refsect1"
><A
NAME="d1-rs-bus-selection"
></A
><H2
>Selecting Buses</H2
><P
><TT
CLASS="filename"
>discover.conf</TT
> defines two lists of system
    buses: one to scan by default (used by the <B
CLASS="command"
>discover</B
>
    command), and one never to scan (used by the <SPAN
CLASS="application"
>Discover</SPAN
> library).</P
><P
>You can override and/or extend the list of default buses with
    <CODE
CLASS="option"
>--disable-bus</CODE
> and <CODE
CLASS="option"
>--enable-bus</CODE
>.
    The list of buses <EM
>not</EM
> to scan cannot be overridden
    without changing <TT
CLASS="filename"
>discover.conf</TT
>, so that list
    should be used only for buses that may be dangerous to probe.</P
><P
>Both arguments take the string <SPAN
CLASS="QUOTE"
>"all"</SPAN
> as a
    value.</P
><P
>If a bus summary is being performed, which is indicated
    either by the presence of <CODE
CLASS="option"
>--bus-summary</CODE
> or
    the absence of <CODE
CLASS="option"
>--type-summary</CODE
> and
    <CODE
CLASS="option"
>--data-path</CODE
>, any unattached arguments on the
    command line will be interpreted as the only buses to scan.
    This is equivalent to using <CODE
CLASS="option"
>--disable-bus
    all</CODE
> before invoking <CODE
CLASS="option"
>--enable-bus</CODE
>
    for the buses of interest.</P
><P
>The following buses are currently supported by <SPAN
CLASS="application"
>Discover</SPAN
>:
    



<P
></P
><UL
><LI
><P
><TT
CLASS="literal"
>ata</TT
></P
></LI
><LI
><P
><TT
CLASS="literal"
>pci</TT
></P
></LI
><LI
><P
><TT
CLASS="literal"
>pcmcia</TT
></P
></LI
><LI
><P
><TT
CLASS="literal"
>scsi</TT
></P
></LI
><LI
><P
><TT
CLASS="literal"
>usb</TT
></P
></LI
></UL
>

    </P
></DIV
><DIV
CLASS="refsect1"
><A
NAME="d1-rs-device-types"
></A
><H2
>Device Types</H2
><P
><SPAN
CLASS="application"
>Discover</SPAN
> defines its own device types, to which the
    device types used by each bus are mapped.  <SPAN
CLASS="application"
>Discover</SPAN
>
    currently recognizes the following device types:
    



<P
></P
><UL
><LI
><P
><TT
CLASS="literal"
>audio</TT
></P
><P
>A device capable of producing an analog or digital
    sound signal is an <I
CLASS="firstterm"
>audio</I
> device.
    Typically, any device commonly referred to as a
    <SPAN
CLASS="QUOTE"
>"sound card"</SPAN
> is classified by <SPAN
CLASS="application"
>Discover</SPAN
> as
    an audio device.</P
></LI
><LI
><P
><TT
CLASS="literal"
>bridge</TT
></P
><P
>A device that provides access to devices of a
    different type, commonly on a different bus, is a
    <I
CLASS="firstterm"
>bridge</I
> device.  For instance, consumer
    <ACRONYM
CLASS="acronym"
>PCI</ACRONYM
> chipsets often feature a bridge to <ACRONYM
CLASS="acronym"
>ATA</ACRONYM
> (also
    known as IDE) devices.</P
></LI
><LI
><P
><TT
CLASS="literal"
>broadband</TT
></P
><P
>An interface device to a computer communications
    network implemented on top of a technology not explicitly
    designed for that purpose is a <I
CLASS="firstterm"
>broadband</I
>
    device.  Examples include ISDN terminal adapters as well
    as DSL and cable <SPAN
CLASS="QUOTE"
>"modems"</SPAN
>; analog
    phone-line modems are not included in this classification
    (see <SPAN
CLASS="QUOTE"
>"modem"</SPAN
> below).</P
></LI
><LI
><P
><TT
CLASS="literal"
>display</TT
></P
><P
>A device controlled by the host machine's CPU and
    capable of producing an analog or digital video signal
    for output purposes is a <I
CLASS="firstterm"
>display</I
> device.
    Typically, any device commonly referred to as a
    <SPAN
CLASS="QUOTE"
>"video card"</SPAN
> is classified by <SPAN
CLASS="application"
>Discover</SPAN
> as
    a display device.</P
></LI
><LI
><P
><TT
CLASS="literal"
>fixeddisk</TT
></P
><P
>A high-speed, fixed magnetic storage device such as
    a hard disk drive is a <I
CLASS="firstterm"
>fixeddisk</I
> device.
    Removable media devices such as floppy disk drives,
    CD-ROM drives, magneto-optical devices, tape drives, and
    Compact Flash card readers are not included in this
    classification.</P
></LI
><LI
><P
><TT
CLASS="literal"
>humaninput</TT
></P
><P
>A device that receives tactile input from a person
    for the purpose of directing a computer's activity is a
    <I
CLASS="firstterm"
>humaninput</I
> device.  Examples include
    keyboards, mice, trackballs, joysticks, gamepads, digital
    tablets manipulated with a stylus or finger, and so
    forth.  Input devices that rely upon non-tactile means of
    determining a person's intent, such as speech-recognition
    devices or cameras, are not included in this
    classification.</P
></LI
><LI
><P
><TT
CLASS="literal"
>imaging</TT
></P
><P
>A device that captures still images for input
    purposes is an <I
CLASS="firstterm"
>imaging</I
> device.  Scanners
    and digital cameras are examples of imaging
    devices.  Motion-capture devices such as television tuner
    cards, webcams, and digital video cameras are not
    included in this classification.</P
></LI
><LI
><P
><TT
CLASS="literal"
>miscellaneous</TT
></P
><P
>Any device that cannot logically be classified as
    another device type is a <I
CLASS="firstterm"
>miscellaneous</I
>
    device.</P
></LI
><LI
><P
><TT
CLASS="literal"
>modem</TT
></P
><P
>An analog phone-line modulator/demodulator
    (modem) is classified by <SPAN
CLASS="application"
>Discover</SPAN
> as a
    <I
CLASS="firstterm"
>modem</I
> device.  No other kind of device is
    so classified.</P
></LI
><LI
><P
><TT
CLASS="literal"
>network</TT
></P
><P
>An interface device to a conventional computer
    data communications network that does not require the use of a terminal
    adapter is a <I
CLASS="firstterm"
>network</I
> device.  For example,
    Ethernet and Token Ring network interface cards are network
    devices.  Analog phone-line modems; terminal adapters
    for technologies such as ISDN and DSL; and <SPAN
CLASS="QUOTE"
>"cable modems"</SPAN
>
    are not <SPAN
CLASS="QUOTE"
>"network"</SPAN
> devices.</P
></LI
><LI
><P
><TT
CLASS="literal"
>optical</TT
></P
><P
>An optical-technology storage device, often using
    read-only media, is an <I
CLASS="firstterm"
>optical</I
> device.  By
    far the most common examples of these devices are CD-ROM
    and DVD-ROM drives, including versions of these drives
    that can <SPAN
CLASS="QUOTE"
>"burn"</SPAN
> (write to) optical
    discs.</P
></LI
><LI
><P
><TT
CLASS="literal"
>printer</TT
></P
><P
>A device that renders visual output in a permanent
    or semi-permanent manner to a physical medium is a
    <I
CLASS="firstterm"
>printer</I
>.  Typically, any device
    colloquially referred to as a <SPAN
CLASS="QUOTE"
>"printer"</SPAN
> is
    also classified by <SPAN
CLASS="application"
>Discover</SPAN
> as a
    printer.</P
></LI
><LI
><P
><TT
CLASS="literal"
>removabledisk</TT
></P
><P
>Storage devices that feature removable media using
    just about any technology except that of magnetic tape,
    CD-ROM, and DVD-ROM drives are
    <I
CLASS="firstterm"
>removabledisk</I
> devices.  Examples include
    floppy disk drives, magneto-optical drives, and Compact
    Flash card readers.</P
></LI
><LI
><P
><TT
CLASS="literal"
>tape</TT
></P
><P
>A sequential-access mass storage device using
    magnetic tape is a <I
CLASS="firstterm"
>tape</I
> device.  Commonly
    used for archival and backup purposes, DAT drives are
    examples of tape devices.</P
></LI
><LI
><P
><TT
CLASS="literal"
>video</TT
></P
><P
>A device that produces a real-time digital video
    signal for input purposes is a <I
CLASS="firstterm"
>video</I
>
    device.  Webcams, digital video cameras, and television
    tuners are examples of video
    devices.  Note that still digital cameras with
    <SPAN
CLASS="QUOTE"
>"movie"</SPAN
> capability are
    <EM
>not</EM
> considered video
    devices unless they can transmit the live video signal to
    the host in real time.</P
></LI
></UL
>

    </P
></DIV
><DIV
CLASS="refsect1"
><A
NAME="d1-rs-examples"
></A
><H2
>Examples</H2
><DIV
CLASS="example"
><A
NAME="d1-ex-scan-buses"
></A
><P
><B
>Example 9-1. Scan the local buses</B
></P
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
WIDTH="100%"
><TR
><TD
><FONT
COLOR="#000000"
><PRE
CLASS="screen"
># discover
Intel Corporation 82815 Chipset Host Bridge and Memory Controller Hub
unknown unknown
unknown unknown
unknown unknown
Intel Corporation 82815 Chipset IDE controller
Intel Corporation 82815 Chipset USB (A)
Intel Corporation 82815 System Management bus controller
ATI Technologies, Inc. Rage 128 Pro GL [PF]
3Com Corporation 3c905C-TX [Fast Etherlink]
Ensoniq ES1371 [AudioPCI-97]
unknown unknown</PRE
></FONT
></TD
></TR
></TABLE
></DIV
><DIV
CLASS="example"
><A
NAME="d1-ex-view-video-cards"
></A
><P
><B
>Example 9-2. View PCI video cards</B
></P
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
WIDTH="100%"
><TR
><TD
><FONT
COLOR="#000000"
><PRE
CLASS="screen"
># discover -v --type-summary --disable-bus all --enable-bus pci display
Disabled pci
Disabled pcmcia
Disabled scsi
Disabled usb
Enabled pci
Loading XML data... pci Done
Scanning buses... pci Done
ATI Technologies, Inc. Rage 128 Pro GL [PF]</PRE
></FONT
></TD
></TR
></TABLE
></DIV
><DIV
CLASS="example"
><A
NAME="d1-ex-query-xfree86"
></A
><P
><B
>Example 9-3. Query for the driver module for
      XFree86 server version 4.2.0</B
></P
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
WIDTH="100%"
><TR
><TD
><FONT
COLOR="#000000"
><PRE
CLASS="screen"
># discover --data-path=xfree86/server/device/driver --data-version=4.2.0 display
ati</PRE
></FONT
></TD
></TR
></TABLE
></DIV
><DIV
CLASS="example"
><A
NAME="d1-ex-type-summary"
></A
><P
><B
>Example 9-4. Get model and vendor
      information by type</B
></P
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
WIDTH="100%"
><TR
><TD
><FONT
COLOR="#000000"
><PRE
CLASS="screen"
>$ discover -t --no-model
Intel Corporation
NVIDIA Corporation
3Com Corporation
$ discover -t --no-vendor
82815 System Management bus controller
Vanta [NV6]
3c905C-TX [Fast Etherlink]</PRE
></FONT
></TD
></TR
></TABLE
></DIV
></DIV
><DIV
CLASS="refsect1"
><A
NAME="d1-rs-files"
></A
><H2
>Files</H2
><P
></P
><DIV
CLASS="variablelist"
><DL
><DT
><TT
CLASS="filename"
>/etc/discover.conf.d</TT
></DT
><DD
><P
>The directory containing configuration files that control 
          the default behavior for both the <B
CLASS="command"
>discover</B
> tool and 
          the <SPAN
CLASS="application"
>Discover</SPAN
> library.
          </P
></DD
><DT
><TT
CLASS="filename"
>file:///lib/discover/list.xml</TT
></DT
><DD
><P
>An <ACRONYM
CLASS="acronym"
>XML</ACRONYM
> file containing <ACRONYM
CLASS="acronym"
>URL</ACRONYM
>s with
            hardware information. This list can be extended with
            <CODE
CLASS="option"
>--append-url</CODE
> and
            <CODE
CLASS="option"
>--extend-url</CODE
>.
          </P
></DD
></DL
></DIV
></DIV
><DIV
CLASS="refsect1"
><A
NAME="d1-rs-authors"
></A
><H2
>Authors</H2
><P
>Josh Bressers, John R. Daily, and
    G. Branden Robinson developed the current implementation of
    <SPAN
CLASS="application"
>Discover</SPAN
> for Progeny Linux Systems.</P
><P
>The Linux implementation of the system-dependent interfaces is
    derived from <B
CLASS="command"
>detect</B
>, by MandrakeSoft SA.</P
></DIV
><DIV
CLASS="refsect1"
><A
NAME="d1-rs-see-also"
></A
><H2
>See Also</H2
><P
>discover.conf(5), discover-modprobe(8)</P
></DIV
></DIV
><DIV
CLASS="chapter"
><HR><H1
><A
NAME="ch-discover-conf_manpage"
></A
>Chapter 10. <TT
CLASS="filename"
>discover.conf</TT
> Manual Page</H1
><H1
><A
NAME="AEN1223"
></A
>discover.conf</H1
><DIV
CLASS="refnamediv"
><A
NAME="AEN1237"
></A
><H2
>Name</H2
>discover.conf&nbsp;--&nbsp;configuration file format for discover(1)</DIV
><DIV
CLASS="refsect1"
><A
NAME="dc5-rs-description"
></A
><H2
>Description</H2
><P
><SPAN
CLASS="application"
>Discover</SPAN
> looks for configuration files in a configuration
    directory, containing a number of files.  These define the 
    system buses that should be scanned by default, those that should 
    never be scanned, and the <ACRONYM
CLASS="acronym"
>URL</ACRONYM
>s for hardware data 
    files beyond the local copy provided with the software.</P
><P
>The file format is <ACRONYM
CLASS="acronym"
>XML</ACRONYM
>; the <A
HREF="#ap-discover_conf_dtd"
><ACRONYM
CLASS="acronym"
>DTD</ACRONYM
></A
>
    is provided with the <SPAN
CLASS="application"
>Discover</SPAN
> software, and can be used for
    informational or validation purposes.</P
></DIV
><DIV
CLASS="refsect1"
><A
NAME="dc5-rs-examples"
></A
><H2
>Examples</H2
><DIV
CLASS="example"
><A
NAME="AEN1252"
></A
><P
><B
>Example 10-1. Establishing default buses to scan</B
></P
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
WIDTH="100%"
><TR
><TD
><FONT
COLOR="#000000"
><PRE
CLASS="programlisting"
>&#13;&#60;?xml version="1.0"?&#62;

&#60;!DOCTYPE conffile SYSTEM "conffile.dtd"&#62;

&#60;conffile&#62;
  &#60;busscan scan="default"&#62;
    &#60;bus name="ata"/&#62;
    &#60;bus name="pci"/&#62;
    &#60;bus name="pcmcia"/&#62;
    &#60;bus name="scsi"/&#62;
    &#60;bus name="usb"/&#62;
  &#60;/busscan&#62;
&#60;/conffile&#62;

</PRE
></FONT
></TD
></TR
></TABLE
></DIV
><DIV
CLASS="example"
><A
NAME="AEN1255"
></A
><P
><B
>Example 10-2. A more complex example</B
></P
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
WIDTH="100%"
><TR
><TD
><FONT
COLOR="#000000"
><PRE
CLASS="programlisting"
>&#13;&#60;?xml version="1.0"?&#62;

&#60;!DOCTYPE conffile SYSTEM "conffile.dtd"&#62;

&#60;conffile&#62;
  &#60;busscan scan="default"&#62;
    &#60;bus name="ata"/&#62;
    &#60;bus name="pci"/&#62;
    &#60;bus name="pcmcia"/&#62;
    &#60;bus name="usb"/&#62;
  &#60;/busscan&#62;
  &#60;!-- My ancient SCSI card locks up when probed --&#62;
  &#60;busscan scan="never"&#62;
    &#60;bus name="scsi"/&#62;
  &#60;/busscan&#62;
  &#60;data-sources&#62;
    &#60;data-source url="http://www.example.com/discover/xfree86.xml"
                 label="Updated XFree86 hardware information"&#62;
  &#60;/data-sources&#62;
&#60;/conffile&#62;

</PRE
></FONT
></TD
></TR
></TABLE
></DIV
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN1258"
></A
><H2
>Authors</H2
><P
>Josh Bressers, John R. Daily, and
    G. Branden Robinson developed the current implementation of
    <SPAN
CLASS="application"
>Discover</SPAN
> for Progeny Linux Systems.</P
><P
>The Linux implementation of the system-dependent interfaces is
    derived from <B
CLASS="command"
>detect</B
>, by MandrakeSoft SA.</P
></DIV
><DIV
CLASS="refsect1"
><A
NAME="dc5-rs-see-also"
></A
><H2
>See Also</H2
><P
>discover(1)</P
></DIV
></DIV
><DIV
CLASS="chapter"
><HR><H1
><A
NAME="ch-discover-modprobe_manpage"
></A
>Chapter 11. <B
CLASS="command"
>discover-modprobe</B
>
      Manual Page</H1
><H1
><A
NAME="AEN1270"
></A
>discover-modprobe</H1
><DIV
CLASS="refnamediv"
><A
NAME="AEN1284"
></A
><H2
>Name</H2
>discover-modprobe&nbsp;--&nbsp;kernel module loading using discover(1)</DIV
><DIV
CLASS="refsynopsisdiv"
><A
NAME="AEN1287"
></A
><H2
>Synopsis</H2
><P
><B
CLASS="command"
>discover-modprobe</B
>  [-n] [-v]</P
></DIV
><DIV
CLASS="refsect1"
><A
NAME="dm8-rs-description"
></A
><H2
>Description</H2
><P
><B
CLASS="command"
>discover-modprobe</B
> loads kernel modules
    identified by <B
CLASS="command"
>discover</B
>. It will typically be invoked
    automatically at boot time.</P
></DIV
><DIV
CLASS="refsect1"
><A
NAME="dm8-rs-options"
></A
><H2
>Options</H2
><P
></P
><DIV
CLASS="variablelist"
><DL
><DT
><CODE
CLASS="option"
>-n</CODE
></DT
><DD
><P
>Echo the <B
CLASS="command"
>modprobe</B
> invocations instead of
          running them.</P
></DD
><DT
><CODE
CLASS="option"
>-v</CODE
></DT
><DD
><P
>Be verbose.</P
></DD
></DL
></DIV
></DIV
><DIV
CLASS="refsect1"
><A
NAME="dm8-rs-files"
></A
><H2
>Files</H2
><P
></P
><DIV
CLASS="variablelist"
><DL
><DT
><TT
CLASS="filename"
>/etc/discover-modprobe.conf</TT
></DT
><DD
><P
>This configuration file defines the types of modules
          to load by default, and specific modules
          <EM
>not</EM
> to load.</P
></DD
><DT
><TT
CLASS="filename"
>/var/lib/discover/crash</TT
></DT
><DD
><P
>A crash file written and erased each time
    <B
CLASS="command"
>discover-modprobe</B
> attempts to load a
    module. If the file lingers, the computer is assumed to have
    crashed while loading that module, and the module name is added
      to <TT
CLASS="filename"
>discover-modprobe.conf</TT
> as a module to
    skip in the future.
    </P
></DD
></DL
></DIV
></DIV
><DIV
CLASS="refsect1"
><A
NAME="dm8-rs-see-also"
></A
><H2
>See Also</H2
><P
>discover-modprobe.conf(5), modprobe(8), discover(1)</P
></DIV
></DIV
><DIV
CLASS="chapter"
><HR><H1
><A
NAME="ch-discover-modprobe-conf_manpage"
></A
>Chapter 12. <TT
CLASS="filename"
>discover-modprobe.conf</TT
>
      Manual Page</H1
><H1
><A
NAME="AEN1333"
></A
>discover-modprobe.conf</H1
><DIV
CLASS="refnamediv"
><A
NAME="AEN1347"
></A
><H2
>Name</H2
>discover-modprobe.conf&nbsp;--&nbsp;configuration file for discover-modprobe(5)</DIV
><DIV
CLASS="refsect1"
><A
NAME="dmc5-rs-description"
></A
><H2
>Description</H2
><P
><TT
CLASS="filename"
>discover-modprobe.conf</TT
> is the configuration
      file for <B
CLASS="command"
>discover-modprobe</B
>, which is responsible
      for retrieving and loading kernel modules.</P
><DIV
CLASS="warning"
><P
></P
><TABLE
CLASS="warning"
WIDTH="100%"
BORDER="0"
><TR
><TD
WIDTH="25"
ALIGN="CENTER"
VALIGN="TOP"
><IMG
SRC="http://www.progeny.com/images/utility/warning.png"
HSPACE="5"
ALT="Warning"></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
><P
>This file is a shell script, and
      as such is subject to a string variable assignment syntax. No space
      is allowed between the variable name, the equal (=) sign, and the
      value(s) assigned. If multiple values are to be assigned, the list
      must be space-delimited with surrounding quotes.</P
></TD
></TR
></TABLE
></DIV
><P
>Two directives can be used in this file:
      <TT
CLASS="literal"
>types</TT
> and <TT
CLASS="literal"
>skip</TT
>. Both can be
      defined multiple times.</P
><P
></P
><DIV
CLASS="variablelist"
><DL
><DT
><TT
CLASS="literal"
>types</TT
></DT
><DD
><P
>This describes the classes of hardware that should be
            scanned and queried.</P
></DD
><DT
><TT
CLASS="literal"
>skip</TT
></DT
><DD
><P
>These modules should never be loaded. See the
            <SPAN
CLASS="QUOTE"
>"Files"</SPAN
> section for details on the mechanism for
            generating these entries automatically.</P
></DD
></DL
></DIV
></DIV
><DIV
CLASS="refsect1"
><A
NAME="dmc5-rs-files"
></A
><H2
>Files</H2
><P
></P
><DIV
CLASS="variablelist"
><DL
><DT
><TT
CLASS="filename"
>/var/lib/discover/crash</TT
></DT
><DD
><P
>A crash file written and erased each time
    <B
CLASS="command"
>discover-modprobe</B
> attempts to load a
    module. If the file lingers, the computer is assumed to have
    crashed while loading that module, and the module name is added
      to <TT
CLASS="filename"
>discover-modprobe.conf</TT
> as a module to
    skip in the future.
    </P
></DD
></DL
></DIV
></DIV
><DIV
CLASS="refsect1"
><A
NAME="dmc5-rs-see-also"
></A
><H2
>See Also</H2
><P
>discover-modprobe(8), modprobe(8), discover(1)</P
></DIV
></DIV
></DIV
><DIV
CLASS="PART"
><A
NAME="pt-library"
></A
><DIV
CLASS="TITLEPAGE"
><H1
CLASS="title"
>IV. Library</H1
><DIV
CLASS="TOC"
><DL
><DT
><B
>Table of Contents</B
></DT
><DT
>13. <A
HREF="#ch-discover_library"
>The <SPAN
CLASS="application"
>Discover</SPAN
> Library</A
></DT
><DD
><DL
><DT
>13.1. <A
HREF="#sc-library_design_principles"
>Library Design
        Principles</A
></DT
><DT
>13.2. <A
HREF="#sc-discover_data_sources"
><SPAN
CLASS="application"
>Discover</SPAN
> Data
        Sources</A
></DT
><DT
>13.3. <A
HREF="#sc-bus_map"
>The Bus Map</A
></DT
><DT
>13.4. <A
HREF="#sc-scanning_system"
>Scanning the System</A
></DT
><DT
>13.5. <A
HREF="#sc-using_discover_device_t_structures"
>Using
        <SPAN
CLASS="type"
>discover_device_t</SPAN
> Structures</A
></DT
></DL
></DD
><DT
>14. <A
HREF="#ch-sysdeps"
>System Dependencies</A
></DT
><DD
><DL
><DT
>14.1. <A
HREF="#sc-sysdeps_api"
><ACRONYM
CLASS="acronym"
>API</ACRONYM
></A
></DT
></DL
></DD
></DL
></DIV
></DIV
><DIV
CLASS="chapter"
><HR><H1
><A
NAME="ch-discover_library"
></A
>Chapter 13. The <SPAN
CLASS="application"
>Discover</SPAN
> Library</H1
><DIV
CLASS="section"
><H2
CLASS="section"
><A
NAME="sc-library_design_principles"
>13.1. Library Design
        Principles</A
></H2
><P
>Lazy allocation is used throughout <SPAN
CLASS="application"
>Discover</SPAN
>.  This means
        that there are no <SPAN
CLASS="QUOTE"
>"init"</SPAN
> functions, and no functions
        to scan the bus.  Instead, retrieval functions scan or initialize
        as necessary. Each of these retrieval functions has an equivalent
        function for freeing the allocated memory.  This is valuable to
        long-lived processes to aid in memory management, but even
        short-lived processes may want to use them to force reloading of
        the information.</P
></DIV
><DIV
CLASS="section"
><HR><H2
CLASS="section"
><A
NAME="sc-discover_data_sources"
>13.2. <SPAN
CLASS="application"
>Discover</SPAN
> Data
        Sources</A
></H2
><P
><SPAN
CLASS="application"
>Discover</SPAN
> knows about one data source by default: the local
        data from the <TT
CLASS="literal"
>discover-data</TT
> package.  Additional
        sources can be added with the
        <CODE
CLASS="function"
>discover_conf_append_url</CODE
> and
        <CODE
CLASS="function"
>discover_conf_insert_url</CODE
> functions.  As their
        names suggest, they append or insert <ACRONYM
CLASS="acronym"
>URL</ACRONYM
>s on the data source
        list.  Earlier data overrides later data; to override
        the local data sources, insert <ACRONYM
CLASS="acronym"
>URL</ACRONYM
>s.</P
></DIV
><DIV
CLASS="section"
><HR><H2
CLASS="section"
><A
NAME="sc-bus_map"
>13.3. The Bus Map</A
></H2
><P
>Most high-level operations begin at the bus map.  Bus maps
        (<A
HREF="api-reference/group__types.html#a2"
TARGET="_top"
><SPAN
CLASS="type"
>discover_bus_map_t</SPAN
></A
>)
        are retrieved with calls to
        <CODE
CLASS="function"
>discover_conf_get_bus_map</CODE
> or
        <CODE
CLASS="function"
>discover_conf_get_bus_map_by_name</CODE
>.
        <CODE
CLASS="function"
>discover_conf_get_bus_map</CODE
> returns an array of
        maps, one for each supported bus, with the last element being all
        0s. <CODE
CLASS="function"
>discover_conf_get_bus_map_by_name</CODE
> returns
        the map for the named bus.  The map contains pointers to all the
        functions that operate on the bus, as well as the
        <CODE
CLASS="varname"
>scan_default</CODE
> variable, which determines whether
        the bus is scanned by default.  There is also a
        <CODE
CLASS="varname"
>scan_never</CODE
> variable, but it is for internal use
        only.  The name of the bus is stored in the
        <CODE
CLASS="varname"
>name</CODE
> variable.</P
><P
>The following functions are available in the bus map.  The
        <SPAN
CLASS="QUOTE"
>"get"</SPAN
> functions take a single <A
HREF="api-reference/group__types.html#a1"
TARGET="_top"
><SPAN
CLASS="type"
>discover_error_t</SPAN
></A
>
        argument and return a list of <A
HREF="api-reference/group__types.html#a3"
TARGET="_top"
><SPAN
CLASS="type"
>discover_device_t</SPAN
></A
>
        structures, while the <SPAN
CLASS="QUOTE"
>"free"</SPAN
> functions take no
        arguments and return no value.</P
><P
></P
><DIV
CLASS="variablelist"
><DL
><DT
><CODE
CLASS="function"
>get_devices</CODE
></DT
><DD
><P
>Retrieve the list of devices found on this bus.
              Returns NULL if the bus is not present on the
              system, or if no devices are attached to it.</P
></DD
><DT
><CODE
CLASS="function"
>xml_get_busclasses</CODE
></DT
><DD
><P
>Retrieve the list of busclasses for this bus (from
              the <ACRONYM
CLASS="acronym"
>XML</ACRONYM
> data sources).</P
></DD
><DT
><CODE
CLASS="function"
>xml_get_devices</CODE
></DT
><DD
><P
>Retrieve the list of devices for this bus (from
              the <ACRONYM
CLASS="acronym"
>XML</ACRONYM
> data sources).  Note that this is the list of
              devices that <SPAN
CLASS="application"
>Discover</SPAN
> knows about, not the list of devices
              present on the system.</P
></DD
><DT
><CODE
CLASS="function"
>xml_get_vendors</CODE
></DT
><DD
><P
>Retrieve the list of vendors for this bus (from
              the <ACRONYM
CLASS="acronym"
>XML</ACRONYM
> data sources).</P
></DD
><DT
><CODE
CLASS="function"
>xml_get_busclass_urls</CODE
></DT
><DD
><P
>Retrieve the list of <ACRONYM
CLASS="acronym"
>URL</ACRONYM
>s from which busclass data
              is retrieved.  This function is probably not useful to
              most clients.</P
></DD
><DT
><CODE
CLASS="function"
>xml_get_device_urls</CODE
></DT
><DD
><P
>Retrieve the list of <ACRONYM
CLASS="acronym"
>URL</ACRONYM
>s from which device data
              is retrieved.  This function is probably not useful to
              most clients.</P
></DD
><DT
><CODE
CLASS="function"
>xml_get_vendor_urls</CODE
></DT
><DD
><P
>Retrieve the list of <ACRONYM
CLASS="acronym"
>URL</ACRONYM
>s from which vendor data
              is retrieved.  This function is probably not useful to
              most clients.</P
></DD
><DT
><CODE
CLASS="function"
>free_devices</CODE
></DT
><DD
><P
>Free the list of devices.</P
></DD
><DT
><CODE
CLASS="function"
>xml_free_busclasses</CODE
></DT
><DD
><P
>Free the list of busclasses.</P
></DD
><DT
><CODE
CLASS="function"
>xml_free_devices</CODE
></DT
><DD
><P
>Free the list of devices (the <ACRONYM
CLASS="acronym"
>XML</ACRONYM
> data, not the
              list of devices found on the system).</P
></DD
><DT
><CODE
CLASS="function"
>xml_free_vendors</CODE
></DT
><DD
><P
>Free the list of vendors.</P
></DD
><DT
><CODE
CLASS="function"
>xml_free_busclass_urls</CODE
></DT
><DD
><P
>Free the list of busclass <ACRONYM
CLASS="acronym"
>URL</ACRONYM
>s.</P
></DD
><DT
><CODE
CLASS="function"
>xml_free_device_urls</CODE
></DT
><DD
><P
>Free the list of device <ACRONYM
CLASS="acronym"
>URL</ACRONYM
>s.</P
></DD
><DT
><CODE
CLASS="function"
>xml_free_vendor_urls</CODE
></DT
><DD
><P
>Free the list of vendor <ACRONYM
CLASS="acronym"
>URL</ACRONYM
>s.</P
></DD
></DL
></DIV
></DIV
><DIV
CLASS="section"
><HR><H2
CLASS="section"
><A
NAME="sc-scanning_system"
>13.4. Scanning the System</A
></H2
><P
><SPAN
CLASS="application"
>Discover</SPAN
> provides a few ways to scan the system for
        information.</P
><P
>You can walk the bus map:</P
><DIV
CLASS="informalexample"
><P
></P
><A
NAME="AEN1511"
></A
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
WIDTH="100%"
><TR
><TD
><FONT
COLOR="#000000"
><PRE
CLASS="programlisting"
>for (i = 0; busmap[i].name; i++) {
    if (busmap[i].scan == DISCOVER_SCAN_DEFAULT) {
        devices = busmap[i].get_devices(&#38;status);
        check_status(status);
        do_something_cool(devices);
    }
}</PRE
></FONT
></TD
></TR
></TABLE
><P
></P
></DIV
><P
>You can scan a specific bus:</P
><DIV
CLASS="informalexample"
><P
></P
><A
NAME="AEN1514"
></A
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
WIDTH="100%"
><TR
><TD
><FONT
COLOR="#000000"
><PRE
CLASS="programlisting"
>devices = discover_get_pci_devices(&#38;status);
check_status(status);
do_something_cool(devices);</PRE
></FONT
></TD
></TR
></TABLE
><P
></P
></DIV
><P
>Perhaps most usefully, you can scan for devices
        of a specific type:</P
><DIV
CLASS="informalexample"
><P
></P
><A
NAME="AEN1517"
></A
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
WIDTH="100%"
><TR
><TD
><FONT
COLOR="#000000"
><PRE
CLASS="programlisting"
>devices = discover_device_find("video", &#38;status);
check_status(status);
do_something_video(devices);</PRE
></FONT
></TD
></TR
></TABLE
><P
></P
></DIV
></DIV
><DIV
CLASS="section"
><HR><H2
CLASS="section"
><A
NAME="sc-using_discover_device_t_structures"
>13.5. Using
        <SPAN
CLASS="type"
>discover_device_t</SPAN
> Structures</A
></H2
><P
>Now that you have some device structures, what can you
        do with them?  The most interesting operation is retrieving
        data with <CODE
CLASS="function"
>discover_device_get_data</CODE
>.  Also
        available are
        <CODE
CLASS="function"
>discover_device_get_vendor_name</CODE
>,
        <CODE
CLASS="function"
>discover_device_get_model_name</CODE
>,
        <CODE
CLASS="function"
>discover_device_get_model_id</CODE
>, and
        <CODE
CLASS="function"
>discover_device_get_vendor_id</CODE
>.</P
><P
><CODE
CLASS="function"
>discover_device_get_data</CODE
> takes a
        <A
HREF="#sc-accessing_device_data"
>data path</A
> and a
        <A
HREF="#sc-data_element_version_attribute"
>version
        number</A
> and searches for the first data structure that
        matches.</P
><P
><CODE
CLASS="function"
>discover_device_get_vendor_name</CODE
>
        returns the human-readable name for the device's
        vendor.</P
><P
><CODE
CLASS="function"
>discover_device_get_model_name</CODE
>
        returns the human-readable name for the device's model.</P
><P
><CODE
CLASS="function"
>discover_device_get_model_id</CODE
>
        returns the bus-specific ID for the device model.</P
><P
><CODE
CLASS="function"
>discover_device_get_vendor_id</CODE
>
        returns the bus-specific ID for the device vendor.</P
></DIV
></DIV
><DIV
CLASS="chapter"
><HR><H1
><A
NAME="ch-sysdeps"
></A
>Chapter 14. System Dependencies</H1
><DIV
CLASS="section"
><H2
CLASS="section"
><A
NAME="sc-sysdeps_api"
>14.1. <ACRONYM
CLASS="acronym"
>API</ACRONYM
></A
></H2
><P
>The system-dependent code (<I
CLASS="firstterm"
>sysdeps</I
>)
        that must be custom-written for each operating system conforms to a
        very simple <ACRONYM
CLASS="acronym"
>API</ACRONYM
>.  <SPAN
CLASS="application"
>Discover</SPAN
> invokes
        <CODE
CLASS="function"
>_discover_get_<TT
CLASS="replaceable"
><I
>busname</I
></TT
>_raw()</CODE
>
        with no arguments, and expects a linked list of
        <A
HREF="api-reference/sysdep_8h.html#a0"
TARGET="_top"
><SPAN
CLASS="type"
>discover_sysdep_data_t</SPAN
></A
> structures in return.</P
><P
>The <A
HREF="api-reference/sysdep_8h.html#a0"
TARGET="_top"
><SPAN
CLASS="type"
>discover_sysdep_data_t</SPAN
></A
> structures should
        contain as much descriptive information as they can regarding the
        devices discovered.  Specifically, the three pieces of information
        desired are the <A
HREF="#ch-busclass_lists"
>busclass</A
> (device
        type), <A
HREF="#ch-vendor_lists"
>vendor
        identifier</A
>, and model identifier, which is a unique
        identification string that the vendor has provided for the given
        piece of hardware.</P
><DIV
CLASS="example"
><A
NAME="AEN1558"
></A
><P
><B
>Example 14-1. Linux <ACRONYM
CLASS="acronym"
>PCI</ACRONYM
> sysdep code</B
></P
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
WIDTH="100%"
><TR
><TD
><FONT
COLOR="#000000"
><PRE
CLASS="programlisting"
>#include &#60;config.h&#62;

#include &#60;stdio.h&#62;
#include &#60;stdlib.h&#62;

#include &#60;sysdep.h&#62;

discover_sysdep_data_t *
_discover_get_pci_raw(void)
{
    FILE *f;
    char *line = NULL;
    size_t len = 0;
    discover_sysdep_data_t *head = NULL, *node, *last = NULL;
    unsigned int id;

    if ((f = fopen(PATH_PROC_PCI, "r"))) {
        while (getline(&#38;line, &#38;len, f) &#62;= 0) {
            if (line[0] == '\n' || line[0] == '#') {
                continue;
            }

            node = _discover_sysdep_data_new();
            sscanf(line, "%*04x\t%08x", &#38;id);
            node-&#62;vendor = (id &#62;&#62; 16);
            node-&#62;model = id &#38; 0xffff;

            if (head == NULL) {
                head = node;
                last = head;
            } else {
                last-&#62;next = node;
                last = node;
            }
        }
        free(line);
        fclose(f);
    }
    return head;
}
</PRE
></FONT
></TD
></TR
></TABLE
></DIV
></DIV
></DIV
></DIV
><DIV
CLASS="appendix"
><HR><H1
><A
NAME="ap-discover_api_reference"
></A
>Appendix A. <SPAN
CLASS="application"
>Discover</SPAN
> <ACRONYM
CLASS="acronym"
>API</ACRONYM
> Reference</H1
><P
>The <ACRONYM
CLASS="acronym"
>API</ACRONYM
> reference is <A
HREF="api-reference/index.html"
TARGET="_top"
>here</A
>.</P
></DIV
><DIV
CLASS="appendix"
><HR><H1
><A
NAME="ap-discover_dtd"
></A
>Appendix B. <SPAN
CLASS="application"
>Discover</SPAN
> <ACRONYM
CLASS="acronym"
>DTD</ACRONYM
></H1
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
WIDTH="100%"
><TR
><TD
><FONT
COLOR="#000000"
><PRE
CLASS="programlisting"
>&#13;&#60;!-- $Progeny$ --&#62;

&#60;!ELEMENT discover-data (location)*&#62;

&#60;!ELEMENT location EMPTY&#62;
&#60;!ATTLIST location bus          NMTOKEN #REQUIRED
                   type         NMTOKEN #REQUIRED
                   url          CDATA   #REQUIRED&#62;

&#60;!ELEMENT busclass_list (busclass)*&#62;
&#60;!ATTLIST busclass_list bus NMTOKEN #REQUIRED&#62;

&#60;!ELEMENT busclass EMPTY&#62;
&#60;!ATTLIST busclass id           NMTOKEN #REQUIRED
                   name         NMTOKEN #REQUIRED&#62;

&#60;!ELEMENT vendor_list (vendor)*&#62;
&#60;!ATTLIST vendor_list bus NMTOKEN #REQUIRED&#62;

&#60;!ELEMENT vendor EMPTY&#62;
&#60;!ATTLIST vendor id             CDATA #REQUIRED
                 name           CDATA #REQUIRED&#62;

&#60;!ELEMENT device_list (device)*&#62;
&#60;!ATTLIST device_list bus NMTOKEN #REQUIRED&#62;

&#60;!ELEMENT device (data)*&#62;
&#60;!ATTLIST device busclass       NMTOKEN #REQUIRED
                 model          CDATA #DEFAULT default
                 model_name     CDATA   #REQUIRED
                 vendor         CDATA #REQUIRED&#62;

&#60;!ELEMENT data (#PCDATA|data)*&#62;
&#60;!ATTLIST data class		NMTOKEN	#REQUIRED
               version		CDATA	#IMPLIED&#62;

&#60;!-- vim:set ai et sts=8 sw=8 tw=0: --&#62;

    </PRE
></FONT
></TD
></TR
></TABLE
></DIV
><DIV
CLASS="appendix"
><HR><H1
><A
NAME="ap-discover_conf_dtd"
></A
>Appendix C. <SPAN
CLASS="application"
>Discover</SPAN
> Configuration File <ACRONYM
CLASS="acronym"
>DTD</ACRONYM
></H1
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
WIDTH="100%"
><TR
><TD
><FONT
COLOR="#000000"
><PRE
CLASS="programlisting"
>&#13;&#60;!-- $Progeny$ --&#62;

&#60;!ELEMENT conffile (busscan*,data-sources?)&#62;

&#60;!ELEMENT data-sources (data-source)*&#62;
&#60;!ELEMENT data-source EMPTY&#62;
&#60;!ATTLIST data-source url          CDATA #REQUIRED
                      label        CDATA #IMPLIED
                      place        NMTOKEN #IMPLIED&#62;

&#60;!ELEMENT busscan (bus)*&#62;

&#60;!-- The attributes will likely be handled by different parts of        --&#62;
&#60;!-- Discover. If there is a list of buses never to scan, the library   --&#62;
&#60;!-- should be aware of it. If there is a list of buses to scan by      --&#62;
&#60;!-- default, that will be of interest to the client tool.              --&#62;
&#60;!ATTLIST busscan scan (default|never) #REQUIRED&#62;

&#60;!ELEMENT bus EMPTY&#62;
&#60;!ATTLIST bus name              NMTOKEN #REQUIRED&#62;

    </PRE
></FONT
></TD
></TR
></TABLE
></DIV
><DIV
CLASS="appendix"
><HR><H1
><A
NAME="ap-licensing_issue_linux_sysdeps"
></A
>Appendix D. Licensing Issue on the Linux Sysdeps</H1
><P
>It should be noted that the Linux-specific files in the
    <TT
CLASS="filename"
>sysdeps/linux</TT
> directory of the source distribution
    are derived from code written for the <SPAN
CLASS="application"
>Detect</SPAN
>
    library by MandrakeSoft SA, and are licensed under the
    <ACRONYM
CLASS="acronym"
>GNU</ACRONYM
> Project's <A
HREF="http://www.gnu.org/copyleft/gpl.html"
TARGET="_top"
>General Public
    License</A
> (<ACRONYM
CLASS="acronym"
>GPL</ACRONYM
>).</P
><P
>Note that section 2 of the <ACRONYM
CLASS="acronym"
>GPL</ACRONYM
> places
    requirements on derived works that prevent licensees from exercising
    some of the permissions granted under the license on the rest of
    <SPAN
CLASS="application"
>Discover</SPAN
>.  However, not everyone who modifies or distributes
    <SPAN
CLASS="application"
>Discover</SPAN
> will necessarily be subject to the terms of the
    <ACRONYM
CLASS="acronym"
>GPL</ACRONYM
>.  If you do not compile, use, or distribute the
    Linux sysdeps (for instance, if you are building <SPAN
CLASS="application"
>Discover</SPAN
> for
    FreeBSD), then the license terms on them do not attach.</P
><P
>We realize, however, that it is desirable that all of <SPAN
CLASS="application"
>Discover</SPAN
>
    be under the the same license terms.  There are a few possible
    solutions to this problem:</P
><P
></P
><UL
><LI
><P
>If you do not need the Linux sysdeps, you can delete them
        from your copy of <SPAN
CLASS="application"
>Discover</SPAN
>.</P
></LI
><LI
><P
>You can rewrite the Linux sysdeps.  The resulting code will
        be your work, so the only limitations on you will be those imposed
        by <SPAN
CLASS="application"
>Discover</SPAN
>'s license.  If you do so, we encourage you to license
        your rewrite under the same terms as the rest of <SPAN
CLASS="application"
>Discover</SPAN
> &#8212;
        in that event, Progeny will be happy to incorporate your code into
        a future release of <SPAN
CLASS="application"
>Discover</SPAN
>.</P
></LI
><LI
><P
>You can contact MandrakeSoft SA and negotiate a different
        license to their code that is used in the Linux sysdeps.</P
></LI
><LI
><P
>You can contact MandrakeSoft SA and attempt to persuade them
        to relicense their code that is used in the Linux sydeps
        under the terms used by the rest of <SPAN
CLASS="application"
>Discover</SPAN
>. (MandrakeSoft SA
        would not have to abandon or assign their copyright.)  If you
        succeed in this effort, please let Progeny know and we will update
        the license terms on our copy of the MandrakeSoft SA code.</P
></LI
><LI
><P
>You can wait; eventually Progeny employees, or some
        volunteer, will rewrite the Linux sysdeps and license them under
        the terms that the rest of <SPAN
CLASS="application"
>Discover</SPAN
> uses.</P
></LI
></UL
><DIV
CLASS="note"
><P
></P
><TABLE
CLASS="note"
WIDTH="100%"
BORDER="0"
><TR
><TD
WIDTH="25"
ALIGN="CENTER"
VALIGN="TOP"
><IMG
SRC="http://www.progeny.com/images/utility/note.png"
HSPACE="5"
ALT="Note"></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
><P
>The foregoing discussing is not legal advice and makes no claim
      to be such.  It is a layperson's understanding of the licensing
      issues from a software developer's perspective.  Progeny makes no
      warranties or guarantees as to the accuracy of the above
      analysis in a legal context.  If you require a professional legal
      opinion, consult attorneys specializing in copyright and licensed to
      practice in the jurisdictions of interest to you or to your
      organization.</P
></TD
></TR
></TABLE
></DIV
></DIV
></DIV
><H3
CLASS="FOOTNOTES"
>Notes</H3
><TABLE
BORDER="0"
CLASS="FOOTNOTES"
WIDTH="100%"
><TR
><TD
ALIGN="LEFT"
VALIGN="TOP"
WIDTH="5%"
><A
NAME="FTN.AEN53"
HREF="#AEN53"
><SPAN
CLASS="footnote"
>[1]</SPAN
></A
></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
WIDTH="95%"
><P
>Other
        protocols such as <ACRONYM
CLASS="acronym"
>FTP</ACRONYM
> are available but deprecated; <SPAN
CLASS="application"
>Discover</SPAN
>
        uses integrity verification mechanisms such as
        <ACRONYM
CLASS="acronym"
>MD5</ACRONYM
> checksums in the <ACRONYM
CLASS="acronym"
>HTTP</ACRONYM
>
        protocol.</P
></TD
></TR
><TR
><TD
ALIGN="LEFT"
VALIGN="TOP"
WIDTH="5%"
><A
NAME="FTN.AEN779"
HREF="#AEN779"
><SPAN
CLASS="footnote"
>[2]</SPAN
></A
></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
WIDTH="95%"
><P
>We would say
        <TT
CLASS="literal"
>[2.2,2.3)</TT
> instead, but, like many Free Software
        projects, the Linux kernel uses odd minor version numbers to
        denote unstable, development series of the software, and even minor
        version numbers to denote stable, production series of the
        software. In the example, then, we arbitrarily treat all 2.3 series
        kernels the same as 2.2 kernels.</P
></TD
></TR
></TABLE
></BODY
></HTML
>
libdiscover2 2.1.2-7.1+deb9u1 / usr / share / doc / discover / guide.html
