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<div class="titlepage"><div><div><h3 class="title">
<a name="asio.reference.SerialPortService"></a><a class="link" href="SerialPortService.html" title="Serial port service requirements"> Serial port service
requirements</a>
</h3></div></div></div>
<p>
A serial port service must meet the requirements for an <a class="link" href="IoObjectService.html" title="I/O object service requirements">I/O
object service</a>, as well as the additional requirements listed below.
</p>
<p>
In the table below, <code class="computeroutput"><span class="identifier">X</span></code> denotes
a serial port service class, <code class="computeroutput"><span class="identifier">a</span></code>
denotes a value of type <code class="computeroutput"><span class="identifier">X</span></code>,
<code class="computeroutput"><span class="identifier">d</span></code> denotes a serial port device
name of type <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span></code>, <code class="computeroutput"><span class="identifier">b</span></code>
denotes a value of type <code class="computeroutput"><span class="identifier">X</span><span class="special">::</span><span class="identifier">implementation_type</span></code>,
<code class="computeroutput"><span class="identifier">n</span></code> denotes a value of type
<code class="computeroutput"><span class="identifier">X</span><span class="special">::</span><span class="identifier">native_type</span></code>, <code class="computeroutput"><span class="identifier">ec</span></code>
denotes a value of type <code class="computeroutput"><span class="identifier">error_code</span></code>,
<code class="computeroutput"><span class="identifier">s</span></code> denotes a value meeting
<a class="link" href="SettableSerialPortOption.html" title="Settable serial port option requirements"><code class="computeroutput"><span class="identifier">SettableSerialPortOption</span></code></a>
requirements, <code class="computeroutput"><span class="identifier">g</span></code> denotes a
value meeting <a class="link" href="GettableSerialPortOption.html" title="Gettable serial port option requirements"><code class="computeroutput"><span class="identifier">GettableSerialPortOption</span></code></a> requirements,
<code class="computeroutput"><span class="identifier">mb</span></code> denotes a value satisfying
<a class="link" href="MutableBufferSequence.html" title="Mutable buffer sequence requirements">mutable buffer sequence</a>
requirements, <code class="computeroutput"><span class="identifier">rh</span></code> denotes
a value meeting <a class="link" href="ReadHandler.html" title="Read handler requirements"><code class="computeroutput"><span class="identifier">ReadHandler</span></code></a> requirements, <code class="computeroutput"><span class="identifier">cb</span></code> denotes a value satisfying <a class="link" href="ConstBufferSequence.html" title="Constant buffer sequence requirements">constant
buffer sequence</a> requirements, and <code class="computeroutput"><span class="identifier">wh</span></code>
denotes a value meeting <a class="link" href="WriteHandler.html" title="Write handler requirements"><code class="computeroutput"><span class="identifier">WriteHandler</span></code></a> requirements. and
<code class="computeroutput"><span class="identifier">u</span></code> and <code class="computeroutput"><span class="identifier">v</span></code>
denote identifiers.
</p>
<div class="table">
<a name="id556244"></a><p class="title"><b>Table 23. SerialPortService requirements</b></p>
<div class="table-contents"><table class="table" summary="SerialPortService requirements">
<colgroup>
<col>
<col>
<col>
</colgroup>
<thead><tr>
<th>
<p>
expression
</p>
</th>
<th>
<p>
return type
</p>
</th>
<th>
<p>
assertion/note<br> pre/post-condition
</p>
</th>
</tr></thead>
<tbody>
<tr>
<td>
<p>
<code class="computeroutput"><span class="identifier">X</span><span class="special">::</span><span class="identifier">native_type</span></code>
</p>
</td>
<td>
<p>
</p>
</td>
<td>
<p>
The implementation-defined native representation of a serial port.
Must satisfy the requirements of <code class="computeroutput"><span class="identifier">CopyConstructible</span></code>
types (C++ Std, 20.1.3), and the requirements of <code class="computeroutput"><span class="identifier">Assignable</span></code>
types (C++ Std, 23.1).
</p>
</td>
</tr>
<tr>
<td>
<p>
<code class="computeroutput"><span class="identifier">a</span><span class="special">.</span><span class="identifier">construct</span><span class="special">(</span><span class="identifier">b</span><span class="special">);</span></code>
</p>
</td>
<td>
<p>
</p>
</td>
<td>
<p>
From <a class="link" href="IoObjectService.html" title="I/O object service requirements">IoObjectService</a>
requirements.<br> post: <code class="computeroutput"><span class="special">!</span><span class="identifier">a</span><span class="special">.</span><span class="identifier">is_open</span><span class="special">(</span><span class="identifier">b</span><span class="special">)</span></code>.
</p>
</td>
</tr>
<tr>
<td>
<p>
<code class="computeroutput"><span class="identifier">a</span><span class="special">.</span><span class="identifier">destroy</span><span class="special">(</span><span class="identifier">b</span><span class="special">);</span></code>
</p>
</td>
<td>
<p>
</p>
</td>
<td>
<p>
From <a class="link" href="IoObjectService.html" title="I/O object service requirements">IoObjectService</a>
requirements. Implicitly cancels asynchronous operations, as if by
calling <code class="computeroutput"><span class="identifier">a</span><span class="special">.</span><span class="identifier">close</span><span class="special">(</span><span class="identifier">b</span><span class="special">,</span> <span class="identifier">ec</span><span class="special">)</span></code>.
</p>
</td>
</tr>
<tr>
<td>
<p>
</p>
<pre class="programlisting"><span class="keyword">const</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span><span class="special">&</span> <span class="identifier">u</span> <span class="special">=</span> <span class="identifier">d</span><span class="special">;</span>
<span class="identifier">a</span><span class="special">.</span><span class="identifier">open</span><span class="special">(</span><span class="identifier">b</span><span class="special">,</span> <span class="identifier">u</span><span class="special">,</span> <span class="identifier">ec</span><span class="special">);</span>
</pre>
<p>
</p>
</td>
<td>
<p>
<code class="computeroutput"><span class="identifier">error_code</span></code>
</p>
</td>
<td>
<p>
pre: <code class="computeroutput"><span class="special">!</span><span class="identifier">a</span><span class="special">.</span><span class="identifier">is_open</span><span class="special">(</span><span class="identifier">b</span><span class="special">)</span></code>.<br> post: <code class="computeroutput"><span class="special">!!</span><span class="identifier">ec</span> <span class="special">||</span> <span class="identifier">a</span><span class="special">.</span><span class="identifier">is_open</span><span class="special">(</span><span class="identifier">b</span><span class="special">)</span></code>.
</p>
</td>
</tr>
<tr>
<td>
<p>
</p>
<pre class="programlisting"><span class="identifier">a</span><span class="special">.</span><span class="identifier">assign</span><span class="special">(</span><span class="identifier">b</span><span class="special">,</span> <span class="identifier">n</span><span class="special">,</span> <span class="identifier">ec</span><span class="special">);</span>
</pre>
<p>
</p>
</td>
<td>
<p>
<code class="computeroutput"><span class="identifier">error_code</span></code>
</p>
</td>
<td>
<p>
pre: <code class="computeroutput"><span class="special">!</span><span class="identifier">a</span><span class="special">.</span><span class="identifier">is_open</span><span class="special">(</span><span class="identifier">b</span><span class="special">)</span></code>.<br> post: <code class="computeroutput"><span class="special">!!</span><span class="identifier">ec</span> <span class="special">||</span> <span class="identifier">a</span><span class="special">.</span><span class="identifier">is_open</span><span class="special">(</span><span class="identifier">b</span><span class="special">)</span></code>.
</p>
</td>
</tr>
<tr>
<td>
<p>
</p>
<pre class="programlisting"><span class="identifier">a</span><span class="special">.</span><span class="identifier">is_open</span><span class="special">(</span><span class="identifier">b</span><span class="special">);</span>
</pre>
<p>
</p>
</td>
<td>
<p>
<code class="computeroutput"><span class="keyword">bool</span></code>
</p>
</td>
<td>
<p>
</p>
</td>
</tr>
<tr>
<td>
<p>
</p>
<pre class="programlisting"><span class="keyword">const</span> <span class="identifier">X</span><span class="special">&</span> <span class="identifier">u</span> <span class="special">=</span> <span class="identifier">a</span><span class="special">;</span>
<span class="keyword">const</span> <span class="identifier">X</span><span class="special">::</span><span class="identifier">implementation_type</span><span class="special">&</span> <span class="identifier">v</span> <span class="special">=</span> <span class="identifier">b</span><span class="special">;</span>
<span class="identifier">u</span><span class="special">.</span><span class="identifier">is_open</span><span class="special">(</span><span class="identifier">v</span><span class="special">);</span>
</pre>
<p>
</p>
</td>
<td>
<p>
<code class="computeroutput"><span class="keyword">bool</span></code>
</p>
</td>
<td>
<p>
</p>
</td>
</tr>
<tr>
<td>
<p>
</p>
<pre class="programlisting"><span class="identifier">a</span><span class="special">.</span><span class="identifier">close</span><span class="special">(</span><span class="identifier">b</span><span class="special">,</span> <span class="identifier">ec</span><span class="special">);</span>
</pre>
<p>
</p>
</td>
<td>
<p>
<code class="computeroutput"><span class="identifier">error_code</span></code>
</p>
</td>
<td>
<p>
If <code class="computeroutput"><span class="identifier">a</span><span class="special">.</span><span class="identifier">is_open</span><span class="special">()</span></code>
is true, causes any outstanding asynchronous operations to complete
as soon as possible. Handlers for cancelled operations shall be passed
the error code <code class="computeroutput"><span class="identifier">error</span><span class="special">::</span><span class="identifier">operation_aborted</span></code>.<br>
post: <code class="computeroutput"><span class="special">!</span><span class="identifier">a</span><span class="special">.</span><span class="identifier">is_open</span><span class="special">(</span><span class="identifier">b</span><span class="special">)</span></code>.
</p>
</td>
</tr>
<tr>
<td>
<p>
</p>
<pre class="programlisting"><span class="identifier">a</span><span class="special">.</span><span class="identifier">native</span><span class="special">(</span><span class="identifier">b</span><span class="special">);</span>
</pre>
<p>
</p>
</td>
<td>
<p>
<code class="computeroutput"><span class="identifier">X</span><span class="special">::</span><span class="identifier">native_type</span></code>
</p>
</td>
<td>
<p>
</p>
</td>
</tr>
<tr>
<td>
<p>
</p>
<pre class="programlisting"><span class="identifier">a</span><span class="special">.</span><span class="identifier">cancel</span><span class="special">(</span><span class="identifier">b</span><span class="special">,</span> <span class="identifier">ec</span><span class="special">);</span>
</pre>
<p>
</p>
</td>
<td>
<p>
<code class="computeroutput"><span class="identifier">error_code</span></code>
</p>
</td>
<td>
<p>
pre: <code class="computeroutput"><span class="identifier">a</span><span class="special">.</span><span class="identifier">is_open</span><span class="special">(</span><span class="identifier">b</span><span class="special">)</span></code>.<br>
Causes any outstanding asynchronous operations to complete as soon
as possible. Handlers for cancelled operations shall be passed the
error code <code class="computeroutput"><span class="identifier">error</span><span class="special">::</span><span class="identifier">operation_aborted</span></code>.
</p>
</td>
</tr>
<tr>
<td>
<p>
</p>
<pre class="programlisting"><span class="identifier">a</span><span class="special">.</span><span class="identifier">set_option</span><span class="special">(</span><span class="identifier">b</span><span class="special">,</span> <span class="identifier">s</span><span class="special">,</span> <span class="identifier">ec</span><span class="special">);</span>
</pre>
<p>
</p>
</td>
<td>
<p>
<code class="computeroutput"><span class="identifier">error_code</span></code>
</p>
</td>
<td>
<p>
pre: <code class="computeroutput"><span class="identifier">a</span><span class="special">.</span><span class="identifier">is_open</span><span class="special">(</span><span class="identifier">b</span><span class="special">)</span></code>.
</p>
</td>
</tr>
<tr>
<td>
<p>
</p>
<pre class="programlisting"><span class="identifier">a</span><span class="special">.</span><span class="identifier">get_option</span><span class="special">(</span><span class="identifier">b</span><span class="special">,</span> <span class="identifier">g</span><span class="special">,</span> <span class="identifier">ec</span><span class="special">);</span>
</pre>
<p>
</p>
</td>
<td>
<p>
<code class="computeroutput"><span class="identifier">error_code</span></code>
</p>
</td>
<td>
<p>
pre: <code class="computeroutput"><span class="identifier">a</span><span class="special">.</span><span class="identifier">is_open</span><span class="special">(</span><span class="identifier">b</span><span class="special">)</span></code>.
</p>
</td>
</tr>
<tr>
<td>
<p>
</p>
<pre class="programlisting"><span class="keyword">const</span> <span class="identifier">X</span><span class="special">&</span> <span class="identifier">u</span> <span class="special">=</span> <span class="identifier">a</span><span class="special">;</span>
<span class="keyword">const</span> <span class="identifier">X</span><span class="special">::</span><span class="identifier">implementation_type</span><span class="special">&</span> <span class="identifier">v</span> <span class="special">=</span> <span class="identifier">b</span><span class="special">;</span>
<span class="identifier">u</span><span class="special">.</span><span class="identifier">get_option</span><span class="special">(</span><span class="identifier">v</span><span class="special">,</span> <span class="identifier">g</span><span class="special">,</span> <span class="identifier">ec</span><span class="special">);</span>
</pre>
<p>
</p>
</td>
<td>
<p>
<code class="computeroutput"><span class="identifier">error_code</span></code>
</p>
</td>
<td>
<p>
pre: <code class="computeroutput"><span class="identifier">a</span><span class="special">.</span><span class="identifier">is_open</span><span class="special">(</span><span class="identifier">b</span><span class="special">)</span></code>.
</p>
</td>
</tr>
<tr>
<td>
<p>
</p>
<pre class="programlisting"><span class="identifier">a</span><span class="special">.</span><span class="identifier">send_break</span><span class="special">(</span><span class="identifier">b</span><span class="special">,</span> <span class="identifier">ec</span><span class="special">);</span>
</pre>
<p>
</p>
</td>
<td>
<p>
<code class="computeroutput"><span class="identifier">error_code</span></code>
</p>
</td>
<td>
<p>
pre: <code class="computeroutput"><span class="identifier">a</span><span class="special">.</span><span class="identifier">is_open</span><span class="special">(</span><span class="identifier">b</span><span class="special">)</span></code>.
</p>
</td>
</tr>
<tr>
<td>
<p>
<code class="computeroutput"><span class="identifier">a</span><span class="special">.</span><span class="identifier">read_some</span><span class="special">(</span><span class="identifier">b</span><span class="special">,</span> <span class="identifier">mb</span><span class="special">,</span> <span class="identifier">ec</span><span class="special">);</span></code>
</p>
</td>
<td>
<p>
<code class="computeroutput"><span class="identifier">size_t</span></code>
</p>
</td>
<td>
<p>
pre: <code class="computeroutput"><span class="identifier">a</span><span class="special">.</span><span class="identifier">is_open</span><span class="special">(</span><span class="identifier">b</span><span class="special">)</span></code>.<br>
<br> Reads one or more bytes of data from a serial port <code class="computeroutput"><span class="identifier">b</span></code>.<br> <br> The mutable buffer
sequence <code class="computeroutput"><span class="identifier">mb</span></code> specifies
memory where the data should be placed. The operation shall always
fill a buffer in the sequence completely before proceeding to the next.<br>
<br> If successful, returns the number of bytes read. Otherwise returns
<code class="computeroutput"><span class="number">0</span></code>. If the total size of
all buffers in the sequence <code class="computeroutput"><span class="identifier">mb</span></code>
is <code class="computeroutput"><span class="number">0</span></code>, the function shall
return <code class="computeroutput"><span class="number">0</span></code> immediately.<br>
<br> If the operation completes due to graceful connection closure
by the peer, the operation shall fail with <code class="computeroutput"><span class="identifier">error</span><span class="special">::</span><span class="identifier">eof</span></code>.
</p>
</td>
</tr>
<tr>
<td>
<p>
<code class="computeroutput"><span class="identifier">a</span><span class="special">.</span><span class="identifier">async_read_some</span><span class="special">(</span><span class="identifier">b</span><span class="special">,</span> <span class="identifier">mb</span><span class="special">,</span> <span class="identifier">rh</span><span class="special">);</span></code>
</p>
</td>
<td>
<p>
<code class="computeroutput"><span class="keyword">void</span></code>
</p>
</td>
<td>
<p>
pre: <code class="computeroutput"><span class="identifier">a</span><span class="special">.</span><span class="identifier">is_open</span><span class="special">(</span><span class="identifier">b</span><span class="special">)</span></code>.<br>
<br> Initiates an asynchronous operation to read one or more bytes
of data from a serial port <code class="computeroutput"><span class="identifier">b</span></code>.
The operation is performed via the <code class="computeroutput"><span class="identifier">io_service</span></code>
object <code class="computeroutput"><span class="identifier">a</span><span class="special">.</span><span class="identifier">get_io_service</span><span class="special">()</span></code>
and behaves according to <a class="link" href="asynchronous_operations.html" title="Requirements on asynchronous operations">asynchronous
operation</a> requirements.<br> <br> The mutable buffer sequence
<code class="computeroutput"><span class="identifier">mb</span></code> specifies memory
where the data should be placed. The operation shall always fill a
buffer in the sequence completely before proceeding to the next.<br>
<br> The implementation shall maintain one or more copies of <code class="computeroutput"><span class="identifier">mb</span></code> until such time as the read operation
no longer requires access to the memory specified by the buffers in
the sequence. The program must ensure the memory is valid until:<br>
<br> — the last copy of <code class="computeroutput"><span class="identifier">mb</span></code>
is destroyed, or<br> <br> — the handler for the asynchronous operation
is invoked,<br> <br> whichever comes first. If the total size of
all buffers in the sequence <code class="computeroutput"><span class="identifier">mb</span></code>
is <code class="computeroutput"><span class="number">0</span></code>, the asynchronous
read operation shall complete immediately and pass <code class="computeroutput"><span class="number">0</span></code>
as the argument to the handler that specifies the number of bytes read.<br>
<br> If the operation completes due to graceful connection closure
by the peer, the operation shall fail with <code class="computeroutput"><span class="identifier">error</span><span class="special">::</span><span class="identifier">eof</span></code>.<br>
<br> If the operation completes successfully, the <code class="computeroutput"><span class="identifier">ReadHandler</span></code>
object <code class="computeroutput"><span class="identifier">rh</span></code> is invoked
with the number of bytes transferred. Otherwise it is invoked with
<code class="computeroutput"><span class="number">0</span></code>.
</p>
</td>
</tr>
<tr>
<td>
<p>
<code class="computeroutput"><span class="identifier">a</span><span class="special">.</span><span class="identifier">write_some</span><span class="special">(</span><span class="identifier">b</span><span class="special">,</span> <span class="identifier">cb</span><span class="special">,</span> <span class="identifier">ec</span><span class="special">);</span></code>
</p>
</td>
<td>
<p>
<code class="computeroutput"><span class="identifier">size_t</span></code>
</p>
</td>
<td>
<p>
pre: <code class="computeroutput"><span class="identifier">a</span><span class="special">.</span><span class="identifier">is_open</span><span class="special">(</span><span class="identifier">b</span><span class="special">)</span></code>.<br>
<br> Writes one or more bytes of data to a serial port <code class="computeroutput"><span class="identifier">b</span></code>.<br> <br> The constant buffer
sequence <code class="computeroutput"><span class="identifier">cb</span></code> specifies
memory where the data to be written is located. The operation shall
always write a buffer in the sequence completely before proceeding
to the next.<br> <br> If successful, returns the number of bytes
written. Otherwise returns <code class="computeroutput"><span class="number">0</span></code>.
If the total size of all buffers in the sequence <code class="computeroutput"><span class="identifier">cb</span></code>
is <code class="computeroutput"><span class="number">0</span></code>, the function shall
return <code class="computeroutput"><span class="number">0</span></code> immediately.
</p>
</td>
</tr>
<tr>
<td>
<p>
<code class="computeroutput"><span class="identifier">a</span><span class="special">.</span><span class="identifier">async_write_some</span><span class="special">(</span><span class="identifier">b</span><span class="special">,</span> <span class="identifier">cb</span><span class="special">,</span> <span class="identifier">wh</span><span class="special">);</span></code>
</p>
</td>
<td>
<p>
<code class="computeroutput"><span class="keyword">void</span></code>
</p>
</td>
<td>
<p>
pre: <code class="computeroutput"><span class="identifier">a</span><span class="special">.</span><span class="identifier">is_open</span><span class="special">(</span><span class="identifier">b</span><span class="special">)</span></code>.<br>
<br> Initiates an asynchronous operation to write one or more bytes
of data to a serial port <code class="computeroutput"><span class="identifier">b</span></code>.
The operation is performed via the <code class="computeroutput"><span class="identifier">io_service</span></code>
object <code class="computeroutput"><span class="identifier">a</span><span class="special">.</span><span class="identifier">get_io_service</span><span class="special">()</span></code>
and behaves according to <a class="link" href="asynchronous_operations.html" title="Requirements on asynchronous operations">asynchronous
operation</a> requirements.<br> <br> The constant buffer sequence
<code class="computeroutput"><span class="identifier">cb</span></code> specifies memory
where the data to be written is located. The operation shall always
write a buffer in the sequence completely before proceeding to the
next.<br> <br> The implementation shall maintain one or more copies
of <code class="computeroutput"><span class="identifier">cb</span></code> until such time
as the write operation no longer requires access to the memory specified
by the buffers in the sequence. The program must ensure the memory
is valid until:<br> <br> — the last copy of <code class="computeroutput"><span class="identifier">cb</span></code>
is destroyed, or<br> <br> — the handler for the asynchronous operation
is invoked,<br> <br> whichever comes first. If the total size of
all buffers in the sequence <code class="computeroutput"><span class="identifier">cb</span></code>
is <code class="computeroutput"><span class="number">0</span></code>, the asynchronous
operation shall complete immediately and pass <code class="computeroutput"><span class="number">0</span></code>
as the argument to the handler that specifies the number of bytes read.<br>
<br> If the operation completes successfully, the <code class="computeroutput"><span class="identifier">WriteHandler</span></code>
object <code class="computeroutput"><span class="identifier">wh</span></code> is invoked
with the number of bytes transferred. Otherwise it is invoked with
<code class="computeroutput"><span class="number">0</span></code>.
</p>
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<td align="right"><div class="copyright-footer">Copyright © 2003 - 2010 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>)
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