763 lines
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763 lines
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<li><strong>nixio.UnifiedIO</strong></li>
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<a href="../modules/nixio.bin.html">nixio.bin</a>
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<div id="content">
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<h1>Object Instance <code>nixio.UnifiedIO</code></h1>
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<p>
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Unified high-level I/O utility API for Files, Sockets and TLS-Sockets.
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These functions are added to the object function tables by doing <strong>
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require "nixio.util"</strong>, can be used on all nixio IO Descriptors and
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are based on the shared low-level read() and write() functions.</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="#UnifiedIO.blocksource">UnifiedIO:blocksource</a> (blocksize, limit)</td>
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<td class="summary">
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Create a block-based iterator.</td>
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</tr>
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<tr>
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<td class="name" nowrap><a href="#UnifiedIO.close">UnifiedIO:close</a> ()</td>
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<td class="summary">
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Close the descriptor.</td>
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</tr>
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<tr>
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<td class="name" nowrap><a href="#UnifiedIO.copy">UnifiedIO:copy</a> (fdout, size)</td>
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<td class="summary">
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Copy data from the current descriptor to another one.</td>
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</tr>
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<tr>
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<td class="name" nowrap><a href="#UnifiedIO.copyz">UnifiedIO:copyz</a> (fdout, size)</td>
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<td class="summary">
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Copy data from the current descriptor to another one using kernel-space
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copying if possible.</td>
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</tr>
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<tr>
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<td class="name" nowrap><a href="#UnifiedIO.is_file">UnifiedIO:is_file</a> ()</td>
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<td class="summary">
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Test whether the I/O-Descriptor is a file.</td>
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</tr>
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<tr>
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<td class="name" nowrap><a href="#UnifiedIO.is_socket">UnifiedIO:is_socket</a> ()</td>
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<td class="summary">
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Test whether the I/O-Descriptor is a socket.</td>
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</tr>
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<tr>
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<td class="name" nowrap><a href="#UnifiedIO.is_tls_socket">UnifiedIO:is_tls_socket</a> ()</td>
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<td class="summary">
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Test whether the I/O-Descriptor is a TLS socket.</td>
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</tr>
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<tr>
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<td class="name" nowrap><a href="#UnifiedIO.linesource">UnifiedIO:linesource</a> (limit)</td>
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<td class="summary">
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Create a line-based iterator.</td>
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</tr>
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<tr>
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<td class="name" nowrap><a href="#UnifiedIO.readall">UnifiedIO:readall</a> (length)</td>
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<td class="summary">
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Read a block of data and wait until all data is available.</td>
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</tr>
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<tr>
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<td class="name" nowrap><a href="#UnifiedIO.sink">UnifiedIO:sink</a> (close_when_done)</td>
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<td class="summary">
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Create a sink.</td>
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</tr>
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<tr>
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<td class="name" nowrap><a href="#UnifiedIO.writeall">UnifiedIO:writeall</a> (block)</td>
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<td class="summary">
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Write a block of data and wait until all data is written.</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="UnifiedIO.blocksource"></a><strong>UnifiedIO:blocksource</strong> (blocksize, limit)</dt>
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<dd>
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Create a block-based iterator.
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<h3>Parameters</h3>
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<ul>
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<li>
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blocksize: Advisory blocksize (optional)
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</li>
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<li>
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limit: Amount of data to consume (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 uses the low-level read function of the descriptor.
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<li>The blocksize given is only advisory and to be seen as an upper limit,
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if an underlying read returns less bytes the chunk is nevertheless returned.
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<li>If the limit parameter is omitted, the iterator returns data
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until an end-of-file, end-of-stream, connection shutdown or similar happens.
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<li>The iterator will not buffer so it is safe to mix with calls to read.
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<li>If the descriptor is non-blocking the iterator may fail with EAGAIN.
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<li>The iterator can be used as an LTN12 source.
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</ul>
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<h3>Return value:</h3>
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Block-based Iterator
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</dd>
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<dt><a name="UnifiedIO.close"></a><strong>UnifiedIO:close</strong> ()</dt>
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<dd>
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Close the descriptor.
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<h3>Usage:</h3>
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If the descriptor is a TLS-socket the underlying descriptor is
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closed without touching the TLS connection.
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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="UnifiedIO.copy"></a><strong>UnifiedIO:copy</strong> (fdout, size)</dt>
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<dd>
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Copy data from the current descriptor to another one.
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<h3>Parameters</h3>
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<ul>
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<li>
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fdout: Target Descriptor
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</li>
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<li>
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size: Bytes to copy (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 uses the blocksource function of the source descriptor
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and the sink function of the target descriptor.
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<li>If the limit parameter is omitted, data is copied
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until an end-of-file, end-of-stream, connection shutdown or similar happens.
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<li>If the descriptor is non-blocking the function may fail with EAGAIN.
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</ul>
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<h3>Return values:</h3>
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<ol>
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<li>bytes that were successfully written if no error occurred
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<li>- reserved for error code -
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<li>- reserved for error message -
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<li>bytes that were successfully written even if an error occurred
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</ol>
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</dd>
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<dt><a name="UnifiedIO.copyz"></a><strong>UnifiedIO:copyz</strong> (fdout, size)</dt>
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<dd>
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Copy data from the current descriptor to another one using kernel-space
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copying if possible.
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<h3>Parameters</h3>
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<ul>
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<li>
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fdout: Target Descriptor
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</li>
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<li>
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size: Bytes to copy (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 uses the sendfile() syscall to copy the data or the
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blocksource function of the source descriptor and the sink function
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of the target descriptor as a fallback mechanism.
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<li>If the limit parameter is omitted, data is copied
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until an end-of-file, end-of-stream, connection shutdown or similar happens.
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<li>If the descriptor is non-blocking the function may fail with EAGAIN.
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</ul>
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<h3>Return values:</h3>
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<ol>
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<li>bytes that were successfully written if no error occurred
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<li>- reserved for error code -
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<li>- reserved for error message -
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<li>bytes that were successfully written even if an error occurred
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</ol>
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</dd>
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<dt><a name="UnifiedIO.is_file"></a><strong>UnifiedIO:is_file</strong> ()</dt>
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<dd>
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Test whether the I/O-Descriptor is a file.
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<h3>Return value:</h3>
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boolean
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</dd>
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<dt><a name="UnifiedIO.is_socket"></a><strong>UnifiedIO:is_socket</strong> ()</dt>
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<dd>
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Test whether the I/O-Descriptor is a socket.
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<h3>Return value:</h3>
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boolean
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</dd>
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<dt><a name="UnifiedIO.is_tls_socket"></a><strong>UnifiedIO:is_tls_socket</strong> ()</dt>
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<dd>
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Test whether the I/O-Descriptor is a TLS socket.
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<h3>Return value:</h3>
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boolean
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</dd>
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<dt><a name="UnifiedIO.linesource"></a><strong>UnifiedIO:linesource</strong> (limit)</dt>
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<dd>
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Create a line-based iterator.
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Lines may end with either \n or \r\n, these control chars are not included
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in the return value.
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<h3>Parameters</h3>
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<ul>
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<li>
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limit: Line limit
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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 uses the low-level read function of the descriptor.
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<li><strong>Note:</strong> This function uses an internal buffer to read
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ahead. Do NOT mix calls to read(all) and the returned iterator. If you want
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to stop reading line-based and want to use the read(all) functions instead
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you can pass "true" to the iterator which will flush the buffer
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and return the bufferd data.
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<li>If the limit parameter is omitted, this function uses the nixio
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buffersize (8192B by default).
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<li>If the descriptor is non-blocking the iterator may fail with EAGAIN.
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<li>The iterator can be used as an LTN12 source.
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</ul>
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<h3>Return value:</h3>
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Line-based Iterator
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</dd>
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<dt><a name="UnifiedIO.readall"></a><strong>UnifiedIO:readall</strong> (length)</dt>
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<dd>
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Read a block of data and wait until all data is available.
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<h3>Parameters</h3>
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<ul>
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<li>
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length: Bytes to read (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 uses the low-level read function of the descriptor.
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<li>If the length parameter is omitted, this function returns all data
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that can be read before an end-of-file, end-of-stream, connection shutdown
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or similar happens.
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<li>If the descriptor is non-blocking this function may fail with EAGAIN.
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</ul>
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<h3>Return values:</h3>
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<ol>
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<li>data that was successfully read if no error occurred
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<li>- reserved for error code -
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<li>- reserved for error message -
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<li>data that was successfully read even if an error occurred
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</ol>
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</dd>
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<dt><a name="UnifiedIO.sink"></a><strong>UnifiedIO:sink</strong> (close_when_done)</dt>
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<dd>
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|
|
Create a sink.
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|
This sink will simply write all data that it receives and optionally
|
|
close the descriptor afterwards.
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|
|
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|
|
<h3>Parameters</h3>
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|
<ul>
|
|
|
|
<li>
|
|
close_when_done: (optional, boolean)
|
|
</li>
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|
</ul>
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|
|
|
|
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|
|
<h3>Usage</h3>
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|
<ul>
|
|
|
|
<li>This function uses the writeall function of the descriptor.
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|
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|
<li>If the descriptor is non-blocking the sink may fail with EAGAIN.
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|
|
<li>The iterator can be used as an LTN12 sink.
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</ul>
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<h3>Return value:</h3>
|
|
Sink
|
|
|
|
|
|
|
|
</dd>
|
|
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|
|
|
|
|
|
|
<dt><a name="UnifiedIO.writeall"></a><strong>UnifiedIO:writeall</strong> (block)</dt>
|
|
<dd>
|
|
|
|
Write a block of data and wait until all data is written.
|
|
|
|
|
|
<h3>Parameters</h3>
|
|
<ul>
|
|
|
|
<li>
|
|
block: Bytes to write
|
|
</li>
|
|
|
|
</ul>
|
|
|
|
|
|
|
|
|
|
<h3>Usage</h3>
|
|
<ul>
|
|
|
|
<li>This function uses the low-level write function of the descriptor.
|
|
|
|
<li>If the descriptor is non-blocking this function may fail with EAGAIN.
|
|
|
|
</ul>
|
|
|
|
|
|
|
|
<h3>Return values:</h3>
|
|
<ol>
|
|
|
|
<li>bytes that were successfully written if no error occurred
|
|
|
|
<li>- reserved for error code -
|
|
|
|
<li>- reserved for error message -
|
|
|
|
<li>bytes that were successfully written even if an error occurred
|
|
|
|
</ol>
|
|
|
|
|
|
|
|
</dd>
|
|
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