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Posted to commits@mynewt.apache.org by ad...@apache.org on 2016/06/20 21:42:23 UTC

[21/51] [partial] incubator-mynewt-site git commit: generated two versions of docs - develop and v0_9_0

http://git-wip-us.apache.org/repos/asf/incubator-mynewt-site/blob/d18c34dd/develop/os/core_os/mbuf/os_mbuf_dup/index.html
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+<!DOCTYPE html>
+<html lang="en">
+    <head>
+        <meta charset="utf-8">
+        <meta http-equiv="X-UA-Compatible" content="IE=edge">
+        <meta name="viewport" content="width=device-width, initial-scale=1.0">
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+        <link rel="shortcut icon" href="../../../../img/favicon.ico">
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+	<title>os_mbuf_dup - Apache Mynewt</title>
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+        <link href="../../../../css/bootstrap-3.0.3.min.css" rel="stylesheet">
+        <link href="../../../../css/font-awesome-4.0.3.css" rel="stylesheet">
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+        <!--[if lt IE 9]>
+            <script src="https://oss.maxcdn.com/libs/html5shiv/3.7.0/html5shiv.js"></script>
+            <script src="https://oss.maxcdn.com/libs/respond.js/1.3.0/respond.min.js"></script>
+        <![endif]-->
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+                ga('send', 'pageview');
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+        
+    </head>
+
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+    <body class="os_mbuf_dup">
+
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+        
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+    <li ><a href="../../mutex/mutex/">Mutexes</a>
+  
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+    <li ><a href="../../memory_pool/memory_pool/">Memory Pools</a>
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+  
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+
+">Memory Buffers</a>
+  
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+    <ul>
+          
+              
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+  
+    <li ><a href="../mbuf/">Mbuf</a>
+  
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+    <ul>
+          
+              
+          
+              
+                
+  
+  
+    <li><a href="
+  ../OS_MBUF_PKTHDR/
+">Functions/Macros</a>
+  
+  
+    <ul>
+          
+              
+                
+    <li >
+      <a href="../OS_MBUF_PKTHDR/">OS_MBUF_PKTHDR</a>
+    </li>
+
+              
+          
+              
+                
+    <li >
+      <a href="../OS_MBUF_PKTHDR_TO_MBUF/">OS_MBUF_PKTHDR_TO_MBUF</a>
+    </li>
+
+              
+          
+              
+                
+    <li >
+      <a href="../OS_MBUF_PKTLEN/">OS_MBUF_PKTLEN</a>
+    </li>
+
+              
+          
+              
+                
+    <li >
+      <a href="../OS_MBUF_DATA/">OS_MBUF_DATA</a>
+    </li>
+
+              
+          
+              
+                
+    <li >
+      <a href="../OS_MBUF_USRHDR/">OS_MBUF_USRHDR</a>
+    </li>
+
+              
+          
+              
+                
+    <li >
+      <a href="../OS_MBUF_USRHDR_LEN/">OS_MBUF_USRHDR_LEN</a>
+    </li>
+
+              
+          
+              
+                
+    <li >
+      <a href="../OS_MBUF_LEADINGSPACE/">OS_MBUF_LEADINGSPACE</a>
+    </li>
+
+              
+          
+              
+                
+    <li >
+      <a href="../OS_MBUF_TRAILINGSPACE/">OS_MBUF_TRAILINGSPACE</a>
+    </li>
+
+              
+          
+              
+                
+    <li >
+      <a href="../os_mbuf_adj/">os_mbuf_adj</a>
+    </li>
+
+              
+          
+              
+                
+    <li >
+      <a href="../os_mbuf_append/">os_mbuf_append</a>
+    </li>
+
+              
+          
+              
+                
+    <li >
+      <a href="../os_mbuf_concat/">os_mbuf_concat</a>
+    </li>
+
+              
+          
+              
+                
+    <li >
+      <a href="../os_mbuf_copydata/">os_mbuf_copydata</a>
+    </li>
+
+              
+          
+              
+                
+    <li >
+      <a href="../os_mbuf_copyinto/">os_mbuf_copyinto</a>
+    </li>
+
+              
+          
+              
+                
+    <li class="active">
+      <a href="./">os_mbuf_dup</a>
+    </li>
+
+              
+          
+              
+                
+    <li >
+      <a href="../os_mbuf_extend/">os_mbuf_extend</a>
+    </li>
+
+              
+          
+              
+                
+    <li >
+      <a href="../os_mbuf_free_chain/">os_mbuf_free_chain</a>
+    </li>
+
+              
+          
+              
+                
+    <li >
+      <a href="../os_mbuf_get/">os_mbuf_get</a>
+    </li>
+
+              
+          
+              
+                
+    <li >
+      <a href="../os_mbuf_get_pkthdr/">os_mbuf_get_pkthdr</a>
+    </li>
+
+              
+          
+              
+                
+    <li >
+      <a href="../os_mbuf_memcmp/">os_mbuf_memcmp</a>
+    </li>
+
+              
+          
+              
+                
+    <li >
+      <a href="../os_mbuf_off/">os_mbuf_off</a>
+    </li>
+
+              
+          
+              
+                
+    <li >
+      <a href="../os_mbuf_pool_init/">os_mbuf_pool_init</a>
+    </li>
+
+              
+          
+              
+                
+    <li >
+      <a href="../os_mbuf_prepend/">os_mbuf_prepend</a>
+    </li>
+
+              
+          
+              
+                
+    <li >
+      <a href="../os_mbuf_pullup/">os_mbuf_pullup</a>
+    </li>
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+  
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+  ../../../../faq/how_to_edit_docs/
+">Appendix</a>
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+    <li><a href="/develop/os/introduction">Docs</a></li>
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+        
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+      
+        <li>&raquo; os_mbuf_dup</li>
+      
+    
+    
+  </ul>
+</div>
+                            </div>
+                        </div>
+                        
+                            <h2 id="os_mbuf_dup"><font color="#F2853F" style="font-size:24pt"> os_mbuf_dup</font></h2>
+<div class="codehilite" style="background: #ffffff"><pre style="line-height: 125%"><span style="color: #A90D91">struct</span> <span style="color: #000000">os_mbuf</span> <span style="color: #000000">*os_mbuf_dup</span>(<span style="color: #A90D91">struct</span> <span style="color: #000000">os_mbuf</span> <span style="color: #000000">*om</span>)
+</pre></div>
+
+
+<p>Duplicate a chain of mbufs.  Return the start of the duplicated chain.</p>
+<p><br></p>
+<h4 id="arguments">Arguments</h4>
+<table>
+<thead>
+<tr>
+<th>Arguments</th>
+<th>Description</th>
+</tr>
+</thead>
+<tbody>
+<tr>
+<td>om</td>
+<td>Pointer to mbuf chain to duplicate</td>
+</tr>
+</tbody>
+</table>
+<p><br></p>
+<h4 id="returned-values">Returned values</h4>
+<p>Pointer to the duplicated chain or NULL if not enough mbufs were available to duplicate the chain.</p>
+<p><br></p>
+<h4 id="example">Example</h4>
+<div class="codehilite" style="background: #ffffff"><pre style="line-height: 125%">    <span style="color: #A90D91">struct</span> <span style="color: #000000">os_mbuf</span> <span style="color: #000000">*om</span>;
+    <span style="color: #A90D91">struct</span> <span style="color: #000000">os_mbuf</span> <span style="color: #000000">*new_om</span>;
+
+    <span style="color: #177500">/* Make a copy of om, returning -1 if not able to duplicate om */</span>
+    <span style="color: #000000">new_om</span> <span style="color: #000000">=</span> <span style="color: #000000">os_mbuf_dup</span>(<span style="color: #000000">om</span>);
+    <span style="color: #A90D91">if</span> (<span style="color: #000000">!new_om</span>) {
+        <span style="color: #A90D91">return</span> <span style="color: #000000">-</span><span style="color: #1C01CE">1</span>;
+    }
+</pre></div>
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+      <a href="../os_mbuf_dup/">os_mbuf_dup</a>
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+      <a href="./">os_mbuf_extend</a>
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+      <a href="../os_mbuf_free_chain/">os_mbuf_free_chain</a>
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+                        
+                            <h2 id="os_mbuf_extend"><font color="#F2853F" style="font-size:24pt"> os_mbuf_extend</font></h2>
+<div class="codehilite" style="background: #ffffff"><pre style="line-height: 125%"><span style="color: #A90D91">void</span> <span style="color: #000000">*os_mbuf_extend</span>(<span style="color: #A90D91">struct</span> <span style="color: #000000">os_mbuf</span> <span style="color: #000000">*om</span>, <span style="color: #A90D91">uint16_t</span> <span style="color: #000000">len</span>);
+</pre></div>
+
+
+<p>Increases the length of an mbuf chain by the specified amount.  If there is not sufficient room in the last buffer, a new buffer is allocated and appended to the chain.  It is an error to request more data than can fit in a single buffer.</p>
+<p><br></p>
+<h4 id="arguments">Arguments</h4>
+<table>
+<thead>
+<tr>
+<th>Arguments</th>
+<th>Description</th>
+</tr>
+</thead>
+<tbody>
+<tr>
+<td>om</td>
+<td>Pointer to mbuf chain</td>
+</tr>
+<tr>
+<td>len</td>
+<td>Number of bytes to increase packet header</td>
+</tr>
+</tbody>
+</table>
+<p><br></p>
+<h4 id="returned-values">Returned values</h4>
+<p>Pointer to start of extended data. Caller is guaranteed that there are at least <em>len</em> bytes from this pointer to the end of the mbuf.</p>
+<p>Returns NULL if extension fails due to insufficient mbufs or <em>len</em> too large.
+<br></p>
+<h4 id="example">Example</h4>
+<div class="codehilite" style="background: #ffffff"><pre style="line-height: 125%">    <span style="color: #A90D91">uint8_t</span> <span style="color: #000000">*dptr</span>;
+    <span style="color: #A90D91">struct</span> <span style="color: #000000">os_mbuf</span> <span style="color: #000000">*om</span>;
+    <span style="color: #A90D91">struct</span> <span style="color: #000000">my_data_struct</span> <span style="color: #000000">my_data</span>;  
+
+    <span style="color: #177500">/* Obtain enough room to add &quot;my_data&quot; to an mbuf chain */</span>
+    <span style="color: #000000">dptr</span> <span style="color: #000000">=</span> <span style="color: #000000">os_mbuf_extend</span>(<span style="color: #000000">om</span>, <span style="color: #A90D91">sizeof</span>(<span style="color: #A90D91">struct</span> <span style="color: #000000">my_data_struct</span>));
+    <span style="color: #A90D91">if</span> (<span style="color: #000000">dptr</span>) {
+        <span style="color: #000000">memcpy</span>(<span style="color: #000000">dptr</span>, <span style="color: #000000">&amp;my_data</span>, <span style="color: #A90D91">sizeof</span>(<span style="color: #A90D91">struct</span> <span style="color: #000000">my_data_struct</span>));
+    }
+</pre></div>
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+    <li><a href="/develop/os/introduction">Docs</a></li>
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+                        
+                            <h2 id="os_mbuf_free_chain"><font color="#F2853F" style="font-size:24pt"> os_mbuf_free_chain</font></h2>
+<div class="codehilite" style="background: #ffffff"><pre style="line-height: 125%"><span style="color: #A90D91">int</span> <span style="color: #000000">os_mbuf_free_chain</span>(<span style="color: #A90D91">struct</span> <span style="color: #000000">os_mbuf</span> <span style="color: #000000">*om</span>);
+</pre></div>
+
+
+<p>Frees a chain of mbufs</p>
+<p><br></p>
+<h4 id="arguments">Arguments</h4>
+<table>
+<thead>
+<tr>
+<th>Arguments</th>
+<th>Description</th>
+</tr>
+</thead>
+<tbody>
+<tr>
+<td>om</td>
+<td>Pointer to mbuf chain</td>
+</tr>
+</tbody>
+</table>
+<p><br></p>
+<h4 id="returned-values">Returned values</h4>
+<p>0: success<br />
+Any other value indicates error</p>
+<p><br></p>
+<h4 id="notes">Notes</h4>
+<p>Note that for each mbuf in the chain, <code>os_mbuf_free()</code> is called.</p>
+<p><br></p>
+<h4 id="example">Example</h4>
+<div class="codehilite" style="background: #ffffff"><pre style="line-height: 125%">    <span style="color: #A90D91">int</span> <span style="color: #000000">rc</span>;
+    <span style="color: #A90D91">struct</span> <span style="color: #000000">os_mbuf</span> <span style="color: #000000">*om</span>;
+
+    <span style="color: #177500">/* Free mbuf chain */</span>
+    <span style="color: #000000">rc</span> <span style="color: #000000">=</span> <span style="color: #000000">os_mbuf_free_chain</span>(<span style="color: #000000">om</span>);
+    <span style="color: #000000">assert</span>(<span style="color: #000000">rc</span> <span style="color: #000000">==</span> <span style="color: #1C01CE">0</span>);
+</pre></div>
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+      <a href="../OS_MBUF_PKTLEN/">OS_MBUF_PKTLEN</a>
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+      <a href="../os_mbuf_get_pkthdr/">os_mbuf_get_pkthdr</a>
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+                        
+                            <h2 id="os_mbuf_get"><font color="#F2853F" style="font-size:24pt">os_mbuf_get</font></h2>
+<div class="codehilite" style="background: #ffffff"><pre style="line-height: 125%"><span style="color: #A90D91">struct</span> <span style="color: #000000">os_mbuf</span> <span style="color: #000000">*os_mbuf_get</span>(<span style="color: #A90D91">struct</span> <span style="color: #000000">os_mbuf_pool</span> <span style="color: #000000">*omp</span>, <span style="color: #A90D91">uint16_t</span> <span style="color: #000000">leadingspace</span>)
+</pre></div>
+
+
+<p>Get an mbuf from the mbuf pool. The mbuf is allocated, and initialized prior to being returned. The <em>leadingspace</em> parameter allows the user to specify the amount of leading space in the allocated mbuf.</p>
+<p><br></p>
+<h4 id="arguments">Arguments</h4>
+<table>
+<thead>
+<tr>
+<th>Arguments</th>
+<th>Description</th>
+</tr>
+</thead>
+<tbody>
+<tr>
+<td>om</td>
+<td>Pointer to mbuf pool from which to allocate mbuf</td>
+</tr>
+<tr>
+<td>leadingspace</td>
+<td>Amount of leading space in allocated mbuf. Request cannot exceed the mbuf data buffer size.</td>
+</tr>
+</tbody>
+</table>
+<p><br></p>
+<h4 id="returned-values">Returned values</h4>
+<p>Returns a pointer to the allocated mbuf or NULL if there are no mbufs available or <em>leadingspace</em> was too large.
+<br></p>
+<h4 id="notes">Notes</h4>
+<p>In most typical applications, the application developer does not need to call <code>os_mbuf_get()</code>; the other API will do this automatically. However, this API is provided for convenience as mbufs can also be a simple way to allocate temporary chunks of memory.</p>
+<p><br></p>
+<h4 id="example">Example</h4>
+<div class="codehilite" style="background: #ffffff"><pre style="line-height: 125%">    <span style="color: #A90D91">struct</span> <span style="color: #000000">os_mbuf</span> <span style="color: #000000">*om</span>;
+
+    <span style="color: #177500">/* Get an mbuf */</span>
+    <span style="color: #000000">om</span> <span style="color: #000000">=</span> <span style="color: #000000">os_mbuf_get</span>(<span style="color: #000000">&amp;g_mbuf_pool</span>, <span style="color: #1C01CE">0</span>);
+    <span style="color: #A90D91">if</span> (<span style="color: #000000">om</span>) {
+        <span style="color: #177500">/* we have allocated an mbuf from the pool */</span>
+    }
+</pre></div>
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+        <script src="../../../../js/base.js"></script>
+        <script src="../../../../js/custom.js"></script>
+
+    </body>
+</html>
\ No newline at end of file