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- <li><strong>nixio.File</strong></li>
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-
-<!-- File list -->
-
-
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-
-
-</div><!-- id="navigation" -->
-
-<div id="content">
-
-<h1>Object Instance <code>nixio.File</code></h1>
-
-<p>
- Large File Object.
- Large file operations are supported up to 52 bits if the Lua number type is
- double (default).</p>
-
-
-
-
-
-
-
-<h2>Functions</h2>
-<table class="function_list">
-
- <tr>
- <td class="name" nowrap><a href="#File.close">File:close</a>&nbsp;()</td>
- <td class="summary">
- Close the file descriptor.</td>
- </tr>
-
- <tr>
- <td class="name" nowrap><a href="#File.fileno">File:fileno</a>&nbsp;()</td>
- <td class="summary">
- Get the number of the filedescriptor.</td>
- </tr>
-
- <tr>
- <td class="name" nowrap><a href="#File.lock">File:lock</a>&nbsp;(command, length)</td>
- <td class="summary">
- Apply or test a lock on the file.</td>
- </tr>
-
- <tr>
- <td class="name" nowrap><a href="#File.read">File:read</a>&nbsp;(length)</td>
- <td class="summary">
- Read from a file descriptor.</td>
- </tr>
-
- <tr>
- <td class="name" nowrap><a href="#File.seek">File:seek</a>&nbsp;(offset, whence)</td>
- <td class="summary">
- Reposition read / write offset of the file descriptor.</td>
- </tr>
-
- <tr>
- <td class="name" nowrap><a href="#File.setblocking">File:setblocking</a>&nbsp;(blocking)</td>
- <td class="summary">
- (POSIX) Set the blocking mode of the file descriptor.</td>
- </tr>
-
- <tr>
- <td class="name" nowrap><a href="#File.stat">File:stat</a>&nbsp;(field)</td>
- <td class="summary">
- Get file status and attributes.</td>
- </tr>
-
- <tr>
- <td class="name" nowrap><a href="#File.sync">File:sync</a>&nbsp;(data_only)</td>
- <td class="summary">
- Synchronizes the file with the storage device.</td>
- </tr>
-
- <tr>
- <td class="name" nowrap><a href="#File.tell">File:tell</a>&nbsp;()</td>
- <td class="summary">
- Return the current read / write offset of the file descriptor.</td>
- </tr>
-
- <tr>
- <td class="name" nowrap><a href="#File.write">File:write</a>&nbsp;(buffer, offset, length)</td>
- <td class="summary">
- Write to the file descriptor.</td>
- </tr>
-
-</table>
-
-
-
-
-
-
-<br/>
-<br/>
-
-
-<h2><a name="functions"></a>Functions</h2>
-<dl class="function">
-
-
-
-<dt><a name="File.close"></a><strong>File:close</strong>&nbsp;()</dt>
-<dd>
-
- Close the file descriptor.
-
-
-
-
-
-
-
-<h3>Return value:</h3>
-true
-
-
-
-</dd>
-
-
-
-
-<dt><a name="File.fileno"></a><strong>File:fileno</strong>&nbsp;()</dt>
-<dd>
-
- Get the number of the filedescriptor.
-
-
-
-
-
-
-
-<h3>Return value:</h3>
-file descriptor number
-
-
-
-</dd>
-
-
-
-
-<dt><a name="File.lock"></a><strong>File:lock</strong>&nbsp;(command, length)</dt>
-<dd>
-
- Apply or test a lock on the file.
-
-
-<h3>Parameters</h3>
-<ul>
-
- <li>
- command: Locking Command ["lock", "tlock", "ulock", "test"]
- </li>
-
- <li>
- length: Amount of Bytes to lock from current offset (optional)
- </li>
-
-</ul>
-
-
-
-
-<h3>Usage</h3>
-<ul>
-
- <li>This function calls lockf() on POSIX and _locking() on Windows.
-
- <li>The "lock" command is blocking, "tlock" is non-blocking,
- "ulock" unlocks and "test" only tests for the lock.
-
- <li>The "test" command is not available on Windows.
-
- <li>Locks are by default advisory on POSIX, but mandatory on Windows.
-
-</ul>
-
-
-
-<h3>Return value:</h3>
-true
-
-
-
-</dd>
-
-
-
-
-<dt><a name="File.read"></a><strong>File:read</strong>&nbsp;(length)</dt>
-<dd>
-
- Read from a file descriptor.
-
-
-<h3>Parameters</h3>
-<ul>
-
- <li>
- length: Amount of data to read (in Bytes).
- </li>
-
-</ul>
-
-
-
-
-<h3>Usage</h3>
-<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)
- nixio buffersize which is <em>nixio.const.buffersize</em> (8192 by default).
- Any read request greater than that will be safely truncated to this value.
-
-</ul>
-
-
-
-<h3>Return value:</h3>
-buffer containing data successfully read
-
-
-
-</dd>
-
-
-
-
-<dt><a name="File.seek"></a><strong>File:seek</strong>&nbsp;(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
- </li>
-
- <li>
- 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>&nbsp;(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>&nbsp;(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>&nbsp;(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>&nbsp;()</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>&nbsp;(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" -->
-
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- <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>
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