95 lines
5.7 KiB
HTML
95 lines
5.7 KiB
HTML
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<meta name="DC.Title" content="Using standard attributes" />
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<meta name="abstract" content="Learn about automatically generated directory attributes of the optical file system." />
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<title>Using standard attributes</title>
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<body id="standardattributes"><a name="standardattributes"><!-- --></a>
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<!-- Java sync-link --><script language="Javascript" src="../rzahg/synch.js" type="text/javascript"></script>
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<h1 class="topictitle1">Using standard attributes</h1>
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<div><p>Learn about automatically generated directory attributes of the
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optical file system.</p>
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<div class="section"><p>Directory entries for files and directories have information that
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is associated with them called <em>attributes</em>. Each attribute consists
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of a name and a value. Some attributes generate automatically when creating
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the directory or file. These attributes are called <em>standard attributes</em>.
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Standard attributes start with the letter Q for ease of identification. All
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file systems use standard attributes. Several receive unique interpretation
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by the optical file system. LAN-attached optical devices have a different
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interpretation of standard attributes than directly-attached optical devices.
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The following is a basic definition of the standard attributes and their meaning
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with respect to optical support.</p>
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</div>
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<div class="section"><h4 class="sectiontitle">QALCSIZE attribute</h4><p>As an output field, QALCSIZE
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is the number of bytes allocated on optical disk by the file. It will always
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be 0 for directories.</p>
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<p>When the QALCSIZE attribute is specified on the
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Open Stream File during a write request, the media is checked to see if there
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is enough space available to allocate the amount specified. If there is not
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enough space available on the optical volume, message CPF1F61, <span class="uicontrol">No
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free space available on media</span>, is issued. For more information
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about using this attribute, see <a href="capacitythreshold.htm">Media
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Capacity and volume threshold</a>. </p>
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</div>
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<div class="section"><h4 class="sectiontitle">QACCDTTM attribute</h4><p>This attribute is not supported
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by the optical file system. It is always the same as the file creation date
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and time (QCRTDTTM).</p>
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</div>
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<div class="section"><h4 class="sectiontitle">QCRTDTTM attribute</h4><p>This attribute indicates the
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creation date of a file or directory.</p>
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</div>
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<div class="section"><h4 class="sectiontitle">QWRTDTTM attribute</h4><p>This attribute indicates the
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last date and time that data was written to an optical file. It does not
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reflect the date and time that the file attributes were last written.</p>
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</div>
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<div class="section"><h4 class="sectiontitle">QFILATTR attribute</h4><div class="p">Support of this attribute is
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only by directly-attached optical support devices. The optical interpretation
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of the file flags is as follows: <ul><li><strong>Read-only file</strong>: i5/OS™ provides full support of this attribute through
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the optical file system. When setting this attribute to on (1), you cannot
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delete or overwrite the file.</li>
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<li><strong>Hidden file</strong>: i5/OS maintains this attribute for the user application
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to manage, but does not fully support it by the optical file system. When
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setting this attribute to ON (1), the optical file system does not recognize
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the file as hidden. User applications require no special access to files with
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this attribute on.</li>
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<li><strong>System file</strong>: i5/OS maintains this attribute for the user application
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to manage; but does not fully support it by the optical file system. When
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setting this attribute to ON (1), the optical file system does not recognize
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the file as a system file. User applications require no special access to
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files with this attribute on.</li>
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<li><strong>Changed file</strong>: i5/OS supports this attribute by the optical file system.
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It is automatically set on (1) when a file is created or written to. You
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can only set it off(0) by using the Change Directory Entry Attributes (QHFCHGAT)
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API.</li>
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</ul>
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</div>
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</div>
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</div>
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<div>
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<div class="familylinks">
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<div class="parentlink"><strong>Parent topic:</strong> <a href="hfs.htm" title="Read this topic collection to learn how to program with the hierarchical file system (HFS).">Hierarchical file system (HFS) programming</a></div>
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</div>
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</div>
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</body>
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