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<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> ()</td>
<td class="summary">
Close the file descriptor.</td>
</tr>
<tr>
<td class="name" nowrap><a href="#File.fileno">File:fileno</a> ()</td>
<td class="summary">
Get the number of the filedescriptor.</td>
</tr>
<tr>
<td class="name" nowrap><a href="#File.lock">File:lock</a> (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> (length)</td>
<td class="summary">
Read from a file descriptor.</td>
</tr>
<tr>
<td class="name" nowrap><a href="#File.seek">File:seek</a> (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> (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> (field)</td>
<td class="summary">
Get file status and attributes.</td>
</tr>
<tr>
<td class="name" nowrap><a href="#File.sync">File:sync</a> (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> ()</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> (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> ()</dt>
<dd>
Close the file descriptor.
<h3>Return value:</h3>
true
</dd>
<dt><a name="File.fileno"></a><strong>File:fileno</strong> ()</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> (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> (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> (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> (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>
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