2015-09-01 10:19:27 +00:00
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<li><a href="../index.html">Index</a></li>
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<!-- Module list -->
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<h1>Modules</h1>
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<ul>
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<li>
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<a href="../modules/luci.dispatcher.html">luci.dispatcher</a>
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</li>
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2015-09-01 14:44:59 +00:00
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<li>
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<a href="../modules/luci.http.html">luci.http</a>
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</li>
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2015-09-01 10:19:27 +00:00
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<li>
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2018-04-30 12:45:25 +00:00
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<a href="../modules/luci.http.conditionals.html">luci.http.conditionals</a>
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2015-09-01 10:19:27 +00:00
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</li>
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<li>
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2018-04-30 12:45:25 +00:00
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<a href="../modules/luci.http.date.html">luci.http.date</a>
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2015-09-01 10:19:27 +00:00
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</li>
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<li>
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2018-04-30 12:45:25 +00:00
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<a href="../modules/luci.http.mime.html">luci.http.mime</a>
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2015-09-01 10:19:27 +00:00
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</li>
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<li>
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<a href="../modules/luci.i18n.html">luci.i18n</a>
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<a href="../modules/luci.ip.html">luci.ip</a>
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<a href="../modules/luci.ip.cidr.html">luci.ip.cidr</a>
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2015-09-01 14:44:59 +00:00
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<li>
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<a href="../modules/luci.json.html">luci.json</a>
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2015-09-01 10:19:27 +00:00
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<li>
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<a href="../modules/luci.jsonc.html">luci.jsonc</a>
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</li>
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<li>
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<a href="../modules/luci.jsonc.parser.html">luci.jsonc.parser</a>
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2015-09-01 14:44:59 +00:00
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<li>
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<a href="../modules/luci.model.ipkg.html">luci.model.ipkg</a>
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<a href="../modules/luci.model.uci.html">luci.model.uci</a>
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<a href="../modules/luci.rpcc.html">luci.rpcc</a>
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<a href="../modules/luci.rpcc.ruci.html">luci.rpcc.ruci</a>
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<a href="../modules/luci.sys.html">luci.sys</a>
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2015-09-01 10:19:27 +00:00
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<li>
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<a href="../modules/luci.sys.init.html">luci.sys.init</a>
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<a href="../modules/luci.sys.iptparser.html">luci.sys.iptparser</a>
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<a href="../modules/luci.sys.net.html">luci.sys.net</a>
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<a href="../modules/luci.sys.process.html">luci.sys.process</a>
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<a href="../modules/luci.sys.user.html">luci.sys.user</a>
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<li>
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<a href="../modules/luci.sys.wifi.html">luci.sys.wifi</a>
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2015-09-01 14:44:59 +00:00
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<li>
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<a href="../modules/luci.util.html">luci.util</a>
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</li>
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2019-07-06 12:18:15 +00:00
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<li>
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<a href="../modules/luci.xml.html">luci.xml</a>
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</li>
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2015-09-01 10:19:27 +00:00
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<li>
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<a href="../modules/nixio.html">nixio</a>
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</li>
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<li>
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<a href="../modules/nixio.CHANGELOG.html">nixio.CHANGELOG</a>
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</li>
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<li>
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<a href="../modules/nixio.CryptoHash.html">nixio.CryptoHash</a>
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</li>
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<li><strong>nixio.File</strong></li>
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<li>
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<a href="../modules/nixio.README.html">nixio.README</a>
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</li>
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<li>
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<a href="../modules/nixio.Socket.html">nixio.Socket</a>
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</li>
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<li>
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<a href="../modules/nixio.TLSContext.html">nixio.TLSContext</a>
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</li>
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<li>
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<a href="../modules/nixio.TLSSocket.html">nixio.TLSSocket</a>
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</li>
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<li>
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<a href="../modules/nixio.UnifiedIO.html">nixio.UnifiedIO</a>
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</li>
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<li>
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<a href="../modules/nixio.bin.html">nixio.bin</a>
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</li>
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<li>
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<a href="../modules/nixio.bit.html">nixio.bit</a>
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</li>
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<li>
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<a href="../modules/nixio.crypto.html">nixio.crypto</a>
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</li>
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<li>
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<a href="../modules/nixio.fs.html">nixio.fs</a>
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</li>
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</ul>
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<!-- File list -->
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</div><!-- id="navigation" -->
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<div id="content">
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<h1>Object Instance <code>nixio.File</code></h1>
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<p>
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Large File Object.
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Large file operations are supported up to 52 bits if the Lua number type is
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double (default).</p>
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<h2>Functions</h2>
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<table class="function_list">
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<tr>
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<td class="name" nowrap><a href="#File.close">File:close</a> ()</td>
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<td class="summary">
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Close the file descriptor.</td>
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</tr>
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<tr>
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<td class="name" nowrap><a href="#File.fileno">File:fileno</a> ()</td>
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<td class="summary">
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Get the number of the filedescriptor.</td>
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</tr>
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<tr>
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<td class="name" nowrap><a href="#File.lock">File:lock</a> (command, length)</td>
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<td class="summary">
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Apply or test a lock on the file.</td>
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</tr>
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<tr>
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<td class="name" nowrap><a href="#File.read">File:read</a> (length)</td>
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<td class="summary">
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Read from a file descriptor.</td>
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</tr>
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<tr>
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<td class="name" nowrap><a href="#File.seek">File:seek</a> (offset, whence)</td>
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<td class="summary">
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Reposition read / write offset of the file descriptor.</td>
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</tr>
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<tr>
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<td class="name" nowrap><a href="#File.setblocking">File:setblocking</a> (blocking)</td>
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<td class="summary">
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(POSIX) Set the blocking mode of the file descriptor.</td>
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</tr>
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<tr>
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<td class="name" nowrap><a href="#File.stat">File:stat</a> (field)</td>
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<td class="summary">
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Get file status and attributes.</td>
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</tr>
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<tr>
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<td class="name" nowrap><a href="#File.sync">File:sync</a> (data_only)</td>
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<td class="summary">
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Synchronizes the file with the storage device.</td>
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</tr>
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<tr>
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<td class="name" nowrap><a href="#File.tell">File:tell</a> ()</td>
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<td class="summary">
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Return the current read / write offset of the file descriptor.</td>
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</tr>
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<tr>
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<td class="name" nowrap><a href="#File.write">File:write</a> (buffer, offset, length)</td>
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<td class="summary">
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Write to the file descriptor.</td>
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</tr>
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</table>
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<br/>
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<br/>
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<h2><a name="functions"></a>Functions</h2>
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<dl class="function">
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<dt><a name="File.close"></a><strong>File:close</strong> ()</dt>
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<dd>
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Close the file descriptor.
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<h3>Return value:</h3>
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true
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</dd>
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<dt><a name="File.fileno"></a><strong>File:fileno</strong> ()</dt>
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<dd>
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Get the number of the filedescriptor.
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<h3>Return value:</h3>
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file descriptor number
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</dd>
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<dt><a name="File.lock"></a><strong>File:lock</strong> (command, length)</dt>
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<dd>
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Apply or test a lock on the file.
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<h3>Parameters</h3>
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<ul>
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<li>
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command: Locking Command ["lock", "tlock", "ulock", "test"]
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</li>
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<li>
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length: Amount of Bytes to lock from current offset (optional)
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</li>
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</ul>
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<h3>Usage</h3>
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<ul>
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<li>This function calls lockf() on POSIX and _locking() on Windows.
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|
<li>The "lock" command is blocking, "tlock" is non-blocking,
|
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|
|
"ulock" unlocks and "test" only tests for the lock.
|
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|
<li>The "test" command is not available on Windows.
|
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|
|
<li>Locks are by default advisory on POSIX, but mandatory on Windows.
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|
|
</ul>
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|
|
<h3>Return value:</h3>
|
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|
|
true
|
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|
|
</dd>
|
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|
<dt><a name="File.read"></a><strong>File:read</strong> (length)</dt>
|
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|
<dd>
|
|
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|
|
Read from a file descriptor.
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|
|
<h3>Parameters</h3>
|
|
|
|
|
<ul>
|
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|
|
|
|
|
|
|
|
<li>
|
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|
|
length: Amount of data to read (in Bytes).
|
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|
|
</li>
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|
|
</ul>
|
|
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|
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|
|
<h3>Usage</h3>
|
|
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|
|
<ul>
|
|
|
|
|
|
|
|
|
|
<li><strong>Warning:</strong> It is not guaranteed that all requested data
|
|
|
|
|
is read at once especially when dealing with pipes.
|
|
|
|
|
You have to check the return value - the length of the buffer actually read -
|
|
|
|
|
or use the safe IO functions in the high-level IO utility module.
|
|
|
|
|
|
|
|
|
|
<li>The length of the return buffer is limited by the (compile time)
|
|
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|
|
nixio buffersize which is <em>nixio.const.buffersize</em> (8192 by default).
|
|
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|
|
Any read request greater than that will be safely truncated to this value.
|
|
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|
|
|
|
|
|
</ul>
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|
|
<h3>Return value:</h3>
|
|
|
|
|
buffer containing data successfully read
|
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|
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|
|
</dd>
|
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|
|
<dt><a name="File.seek"></a><strong>File:seek</strong> (offset, whence)</dt>
|
|
|
|
|
<dd>
|
|
|
|
|
|
|
|
|
|
Reposition read / write offset of the file descriptor.
|
|
|
|
|
The seek will be done either from the beginning of the file or relative
|
|
|
|
|
to the current position or relative to the end.
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
<h3>Parameters</h3>
|
|
|
|
|
<ul>
|
|
|
|
|
|
|
|
|
|
<li>
|
|
|
|
|
offset: File Offset
|
|
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|
|
</li>
|
|
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|
|
|
|
|
|
|
<li>
|
|
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|
|
whence: Starting point [<strong>"set"</strong>, "cur", "end"]
|
|
|
|
|
</li>
|
|
|
|
|
|
|
|
|
|
</ul>
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
<h3>Usage:</h3>
|
|
|
|
|
This function calls lseek().
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
<h3>Return value:</h3>
|
|
|
|
|
new (absolute) offset position
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
</dd>
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
<dt><a name="File.setblocking"></a><strong>File:setblocking</strong> (blocking)</dt>
|
|
|
|
|
<dd>
|
|
|
|
|
|
|
|
|
|
(POSIX) Set the blocking mode of the file descriptor.
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
<h3>Parameters</h3>
|
|
|
|
|
<ul>
|
|
|
|
|
|
|
|
|
|
<li>
|
|
|
|
|
blocking: (boolean)
|
|
|
|
|
</li>
|
|
|
|
|
|
|
|
|
|
</ul>
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
<h3>Return value:</h3>
|
|
|
|
|
true
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
</dd>
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
<dt><a name="File.stat"></a><strong>File:stat</strong> (field)</dt>
|
|
|
|
|
<dd>
|
|
|
|
|
|
|
|
|
|
Get file status and attributes.
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
<h3>Parameters</h3>
|
|
|
|
|
<ul>
|
|
|
|
|
|
|
|
|
|
<li>
|
|
|
|
|
field: Only return a specific field, not the whole table (optional)
|
|
|
|
|
</li>
|
|
|
|
|
|
|
|
|
|
</ul>
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
<h3>Usage:</h3>
|
|
|
|
|
This function calls fstat().
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
<h3>Return value:</h3>
|
|
|
|
|
Table containing: <ul>
|
|
|
|
|
<li>atime = Last access timestamp</li>
|
|
|
|
|
<li>blksize = Blocksize (POSIX only)</li>
|
|
|
|
|
<li>blocks = Blocks used (POSIX only)</li>
|
|
|
|
|
<li>ctime = Creation timestamp</li>
|
|
|
|
|
<li>dev = Device ID</li>
|
|
|
|
|
<li>gid = Group ID</li>
|
|
|
|
|
<li>ino = Inode</li>
|
|
|
|
|
<li>modedec = Mode converted into a decimal number</li>
|
|
|
|
|
<li>modestr = Mode as string as returned by <code>ls -l</code></li>
|
|
|
|
|
<li>mtime = Last modification timestamp</li>
|
|
|
|
|
<li>nlink = Number of links</li>
|
|
|
|
|
<li>rdev = Device ID (if special file)</li>
|
|
|
|
|
<li>size = Size in bytes</li>
|
|
|
|
|
<li>type = ["reg", "dir", "chr", "blk", "fifo", "lnk", "sock"]</li>
|
|
|
|
|
<li>uid = User ID</li>
|
|
|
|
|
</ul>
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
</dd>
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
<dt><a name="File.sync"></a><strong>File:sync</strong> (data_only)</dt>
|
|
|
|
|
<dd>
|
|
|
|
|
|
|
|
|
|
Synchronizes the file with the storage device.
|
|
|
|
|
Returns when the file is successfully written to the disk.
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
<h3>Parameters</h3>
|
|
|
|
|
<ul>
|
|
|
|
|
|
|
|
|
|
<li>
|
|
|
|
|
data_only: Do not synchronize the metadata. (optional, boolean)
|
|
|
|
|
</li>
|
|
|
|
|
|
|
|
|
|
</ul>
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
<h3>Usage</h3>
|
|
|
|
|
<ul>
|
|
|
|
|
|
|
|
|
|
<li>This function calls fsync() when data_only equals false
|
|
|
|
|
otherwise fdatasync(), on Windows _commit() is used instead.
|
|
|
|
|
|
|
|
|
|
<li>fdatasync() is only supported by Linux and Solaris. For other systems
|
|
|
|
|
the <em>data_only</em> parameter is ignored and fsync() is always called.
|
|
|
|
|
|
|
|
|
|
</ul>
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
<h3>Return value:</h3>
|
|
|
|
|
true
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
</dd>
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
<dt><a name="File.tell"></a><strong>File:tell</strong> ()</dt>
|
|
|
|
|
<dd>
|
|
|
|
|
|
|
|
|
|
Return the current read / write offset of the file descriptor.
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
<h3>Usage:</h3>
|
|
|
|
|
This function calls lseek() with offset 0 from the current position.
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
<h3>Return value:</h3>
|
|
|
|
|
offset position
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
</dd>
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
<dt><a name="File.write"></a><strong>File:write</strong> (buffer, offset, length)</dt>
|
|
|
|
|
<dd>
|
|
|
|
|
|
|
|
|
|
Write to the file descriptor.
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
<h3>Parameters</h3>
|
|
|
|
|
<ul>
|
|
|
|
|
|
|
|
|
|
<li>
|
|
|
|
|
buffer: Buffer holding the data to be written.
|
|
|
|
|
</li>
|
|
|
|
|
|
|
|
|
|
<li>
|
|
|
|
|
offset: Offset to start reading the buffer from. (optional)
|
|
|
|
|
</li>
|
|
|
|
|
|
|
|
|
|
<li>
|
|
|
|
|
length: Length of chunk to read from the buffer. (optional)
|
|
|
|
|
</li>
|
|
|
|
|
|
|
|
|
|
</ul>
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
<h3>Usage</h3>
|
|
|
|
|
<ul>
|
|
|
|
|
|
|
|
|
|
<li><strong>Warning:</strong> It is not guaranteed that all data
|
|
|
|
|
in the buffer is written at once especially when dealing with pipes.
|
|
|
|
|
You have to check the return value - the number of bytes actually written -
|
|
|
|
|
or use the safe IO functions in the high-level IO utility module.
|
|
|
|
|
|
|
|
|
|
<li>Unlike standard Lua indexing the lowest offset and default is 0.
|
|
|
|
|
|
|
|
|
|
</ul>
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
<h3>Return value:</h3>
|
|
|
|
|
number of bytes written
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
</dd>
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
</dl>
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
</div> <!-- id="content" -->
|
|
|
|
|
|
|
|
|
|
</div> <!-- id="main" -->
|
|
|
|
|
|
|
|
|
|
<div id="about">
|
|
|
|
|
<p><a href="http://validator.w3.org/check?uri=referer"><img src="http://www.w3.org/Icons/valid-xhtml10" alt="Valid XHTML 1.0!" height="31" width="88" /></a></p>
|
|
|
|
|
</div> <!-- id="about" -->
|
|
|
|
|
|
|
|
|
|
</div> <!-- id="container" -->
|
|
|
|
|
</body>
|
|
|
|
|
</html>
|
