Adds asio library and Storage Module

lib/asio-1.18.0/doc/asio/overview/posix/stream_descriptor.html

@@ -0,0 +1,86 @@
+<html>
+<head>
+<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
+<title>Stream-Oriented File Descriptors</title>
+<link rel="stylesheet" href="../../../boostbook.css" type="text/css">
+<meta name="generator" content="DocBook XSL Stylesheets V1.75.2">
+<link rel="home" href="../../../index.html" title="Asio">
+<link rel="up" href="../posix.html" title="POSIX-Specific Functionality">
+<link rel="prev" href="local.html" title="UNIX Domain Sockets">
+<link rel="next" href="fork.html" title="Fork">
+</head>
+<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
+<table cellpadding="2" width="100%"><tr><td valign="top"><img alt="asio C++ library" width="250" height="60" src="../../../asio.png"></td></tr></table>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="local.html"><img src="../../../prev.png" alt="Prev"></a><a accesskey="u" href="../posix.html"><img src="../../../up.png" alt="Up"></a><a accesskey="h" href="../../../index.html"><img src="../../../home.png" alt="Home"></a><a accesskey="n" href="fork.html"><img src="../../../next.png" alt="Next"></a>
+</div>
+<div class="section">
+<div class="titlepage"><div><div><h4 class="title">
+<a name="asio.overview.posix.stream_descriptor"></a><a class="link" href="stream_descriptor.html" title="Stream-Oriented File Descriptors">Stream-Oriented
+        File Descriptors</a>
+</h4></div></div></div>
+<p>
+          Asio includes classes added to permit synchronous and asynchronous read
+          and write operations to be performed on POSIX file descriptors, such as
+          pipes, standard input and output, and various devices.
+        </p>
+<p>
+          These classes also provide limited support for regular files. This support
+          assumes that the underlying read and write operations provided by the operating
+          system never fail with <code class="computeroutput">EAGAIN</code> or <code class="computeroutput">EWOULDBLOCK</code>.
+          (This assumption normally holds for buffered file I/O.) Synchronous and
+          asynchronous read and write operations on file descriptors will succeed
+          but the I/O will always be performed immediately. Wait operations, and
+          operations involving <code class="computeroutput">asio::null_buffers</code>, are not portably
+          supported.
+        </p>
+<p>
+          For example, to perform read and write operations on standard input and
+          output, the following objects may be created:
+        </p>
+<pre class="programlisting">posix::stream_descriptor in(my_io_context, ::dup(STDIN_FILENO));
+posix::stream_descriptor out(my_io_context, ::dup(STDOUT_FILENO));
+</pre>
+<p>
+          These are then used as synchronous or asynchronous read and write streams.
+          This means the objects can be used with any of the <a class="link" href="../../reference/read.html" title="read">read()</a>,
+          <a class="link" href="../../reference/async_read.html" title="async_read">async_read()</a>, <a class="link" href="../../reference/write.html" title="write">write()</a>,
+          <a class="link" href="../../reference/async_write.html" title="async_write">async_write()</a>, <a class="link" href="../../reference/read_until.html" title="read_until">read_until()</a> or <a class="link" href="../../reference/async_read_until.html" title="async_read_until">async_read_until()</a>
+          free functions.
+        </p>
+<h6>
+<a name="asio.overview.posix.stream_descriptor.h0"></a>
+          <span><a name="asio.overview.posix.stream_descriptor.see_also"></a></span><a class="link" href="stream_descriptor.html#asio.overview.posix.stream_descriptor.see_also">See
+          Also</a>
+        </h6>
+<p>
+          <a class="link" href="../../reference/posix__stream_descriptor.html" title="posix::stream_descriptor">posix::stream_descriptor</a>,
+          <a class="link" href="../../examples/cpp03_examples.html#asio.examples.cpp03_examples.chat">Chat example (C++03)</a>,
+          <a class="link" href="../../examples/cpp11_examples.html#asio.examples.cpp11_examples.chat">Chat example (C++11)</a>.
+        </p>
+<h6>
+<a name="asio.overview.posix.stream_descriptor.h1"></a>
+          <span><a name="asio.overview.posix.stream_descriptor.notes"></a></span><a class="link" href="stream_descriptor.html#asio.overview.posix.stream_descriptor.notes">Notes</a>
+        </h6>
+<p>
+          POSIX stream descriptors are only available at compile time if supported
+          by the target operating system. A program may test for the macro <code class="computeroutput">ASIO_HAS_POSIX_STREAM_DESCRIPTOR</code>
+          to determine whether they are supported.
+        </p>
+</div>
+<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
+<td align="left"></td>
+<td align="right"><div class="copyright-footer">Copyright © 2003-2020 Christopher M.
+      Kohlhoff<p>
+        Distributed under the Boost Software License, Version 1.0. (See accompanying
+        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
+      </p>
+</div></td>
+</tr></table>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="local.html"><img src="../../../prev.png" alt="Prev"></a><a accesskey="u" href="../posix.html"><img src="../../../up.png" alt="Up"></a><a accesskey="h" href="../../../index.html"><img src="../../../home.png" alt="Home"></a><a accesskey="n" href="fork.html"><img src="../../../next.png" alt="Next"></a>
+</div>
+</body>
+</html>