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<li class="toctree-l2"><a class="reference internal" href="nghttp2_session_get_stream_effective_recv_data_length.html">nghttp2_session_get_stream_effective_recv_data_length</a></li>
<li class="toctree-l2"><a class="reference internal" href="nghttp2_session_get_stream_local_close.html">nghttp2_session_get_stream_local_close</a></li>
<li class="toctree-l2"><a class="reference internal" href="nghttp2_session_get_stream_local_window_size.html">nghttp2_session_get_stream_local_window_size</a></li>
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<li class="toctree-l2"><a class="reference internal" href="nghttp2_session_get_stream_remote_window_size.html">nghttp2_session_get_stream_remote_window_size</a></li>
<li class="toctree-l2"><a class="reference internal" href="nghttp2_session_get_stream_user_data.html">nghttp2_session_get_stream_user_data</a></li>
<li class="toctree-l2"><a class="reference internal" href="nghttp2_session_mem_recv.html">nghttp2_session_mem_recv</a></li>
<li class="toctree-l2 current"><a class="current reference internal" href="#">nghttp2_session_mem_send</a><ul>
<li class="toctree-l3"><a class="reference internal" href="#synopsis">Synopsis</a></li>
</ul>
</li>
<li class="toctree-l2"><a class="reference internal" href="nghttp2_session_recv.html">nghttp2_session_recv</a></li>
<li class="toctree-l2"><a class="reference internal" href="nghttp2_session_resume_data.html">nghttp2_session_resume_data</a></li>
<li class="toctree-l2"><a class="reference internal" href="nghttp2_session_send.html">nghttp2_session_send</a></li>
<li class="toctree-l2"><a class="reference internal" href="nghttp2_session_server_new.html">nghttp2_session_server_new</a></li>
<li class="toctree-l2"><a class="reference internal" href="nghttp2_session_server_new2.html">nghttp2_session_server_new2</a></li>
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<li class="toctree-l2"><a class="reference internal" href="nghttp2_session_set_next_stream_id.html">nghttp2_session_set_next_stream_id</a></li>
<li class="toctree-l2"><a class="reference internal" href="nghttp2_session_set_stream_user_data.html">nghttp2_session_set_stream_user_data</a></li>
<li class="toctree-l2"><a class="reference internal" href="nghttp2_session_set_user_data.html">nghttp2_session_set_user_data</a></li>
<li class="toctree-l2"><a class="reference internal" href="nghttp2_session_terminate_session.html">nghttp2_session_terminate_session</a></li>
<li class="toctree-l2"><a class="reference internal" href="nghttp2_session_terminate_session2.html">nghttp2_session_terminate_session2</a></li>
<li class="toctree-l2"><a class="reference internal" href="nghttp2_session_upgrade.html">nghttp2_session_upgrade</a></li>
<li class="toctree-l2"><a class="reference internal" href="nghttp2_session_upgrade2.html">nghttp2_session_upgrade2</a></li>
<li class="toctree-l2"><a class="reference internal" href="nghttp2_session_want_read.html">nghttp2_session_want_read</a></li>
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<div class="section" id="nghttp2-session-mem-send">
<h1>nghttp2_session_mem_send<a class="headerlink" href="#nghttp2-session-mem-send" title="Permalink to this headline">¶</a></h1>
<div class="section" id="synopsis">
<h2>Synopsis<a class="headerlink" href="#synopsis" title="Permalink to this headline">¶</a></h2>
<p><em>#include <nghttp2/nghttp2.h></em></p>
<dl class="function">
<dt id="c.nghttp2_session_mem_send">
ssize_t <code class="descname">nghttp2_session_mem_send</code><span class="sig-paren">(</span><a class="reference internal" href="types.html#c.nghttp2_session" title="nghttp2_session">nghttp2_session</a><em> *session</em>, const uint8_t<em> **data_ptr</em><span class="sig-paren">)</span><a class="headerlink" href="#c.nghttp2_session_mem_send" title="Permalink to this definition">¶</a></dt>
<dd><p>Returns the serialized data to send.</p>
<p>This function behaves like <a class="reference internal" href="nghttp2_session_send.html#c.nghttp2_session_send" title="nghttp2_session_send"><code class="xref c c-func docutils literal notranslate"><span class="pre">nghttp2_session_send()</span></code></a> except that it
does not use <a class="reference internal" href="types.html#c.nghttp2_send_callback" title="nghttp2_send_callback"><code class="xref c c-type docutils literal notranslate"><span class="pre">nghttp2_send_callback</span></code></a> to transmit data.
Instead, it assigns the pointer to the serialized data to the
<em>*data_ptr</em> and returns its length. The other callbacks are called
in the same way as they are in <a class="reference internal" href="nghttp2_session_send.html#c.nghttp2_session_send" title="nghttp2_session_send"><code class="xref c c-func docutils literal notranslate"><span class="pre">nghttp2_session_send()</span></code></a>.</p>
<p>If no data is available to send, this function returns 0.</p>
<p>This function may not return all serialized data in one invocation.
To get all data, call this function repeatedly until it returns 0
or one of negative error codes.</p>
<p>The assigned <em>*data_ptr</em> is valid until the next call of
<a class="reference internal" href="#c.nghttp2_session_mem_send" title="nghttp2_session_mem_send"><code class="xref c c-func docutils literal notranslate"><span class="pre">nghttp2_session_mem_send()</span></code></a> or <a class="reference internal" href="nghttp2_session_send.html#c.nghttp2_session_send" title="nghttp2_session_send"><code class="xref c c-func docutils literal notranslate"><span class="pre">nghttp2_session_send()</span></code></a>.</p>
<p>The caller must send all data before sending the next chunk of
data.</p>
<p>This function returns the length of the data pointed by the
<em>*data_ptr</em> if it succeeds, or one of the following negative error
codes:</p>
<dl class="docutils">
<dt><a class="reference internal" href="enums.html#c.NGHTTP2_ERR_NOMEM" title="NGHTTP2_ERR_NOMEM"><code class="xref c c-macro docutils literal notranslate"><span class="pre">NGHTTP2_ERR_NOMEM</span></code></a></dt>
<dd>Out of memory.</dd>
</dl>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p class="last">This function may produce very small byte string. If that is the
case, and application disables Nagle algorithm (<code class="docutils literal notranslate"><span class="pre">TCP_NODELAY</span></code>),
then writing this small chunk leads to very small packet, and it
is very inefficient. An application should be responsible to
buffer up small chunks of data as necessary to avoid this
situation.</p>
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