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<div class="section" id="nghttp2-submit-window-update">
<h1>nghttp2_submit_window_update<a class="headerlink" href="#nghttp2-submit-window-update" 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_submit_window_update">
int <code class="descname">nghttp2_submit_window_update</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>, uint8_t<em> flags</em>, int32_t<em> stream_id</em>, int32_t<em> window_size_increment</em><span class="sig-paren">)</span><a class="headerlink" href="#c.nghttp2_submit_window_update" title="Permalink to this definition">¶</a></dt>
<dd><p>Submits WINDOW_UPDATE frame.</p>
<p>The <em>flags</em> is currently ignored and should be
<a class="reference internal" href="enums.html#c.NGHTTP2_FLAG_NONE" title="NGHTTP2_FLAG_NONE"><code class="xref c c-macro docutils literal notranslate"><span class="pre">NGHTTP2_FLAG_NONE</span></code></a>.</p>
<p>The <em>stream_id</em> is the stream ID to send this WINDOW_UPDATE. To
send connection level WINDOW_UPDATE, specify 0 to <em>stream_id</em>.</p>
<p>If the <em>window_size_increment</em> is positive, the WINDOW_UPDATE with
that value as window_size_increment is queued. If the
<em>window_size_increment</em> is larger than the received bytes from the
remote endpoint, the local window size is increased by that
difference. If the sole purpose is to increase the local window
size, consider to use <a class="reference internal" href="nghttp2_session_set_local_window_size.html#c.nghttp2_session_set_local_window_size" title="nghttp2_session_set_local_window_size"><code class="xref c c-func docutils literal notranslate"><span class="pre">nghttp2_session_set_local_window_size()</span></code></a>.</p>
<p>If the <em>window_size_increment</em> is negative, the local window size
is decreased by -<em>window_size_increment</em>. If automatic
WINDOW_UPDATE is enabled
(<a class="reference internal" href="nghttp2_option_set_no_auto_window_update.html#c.nghttp2_option_set_no_auto_window_update" title="nghttp2_option_set_no_auto_window_update"><code class="xref c c-func docutils literal notranslate"><span class="pre">nghttp2_option_set_no_auto_window_update()</span></code></a>), and the library
decided that the WINDOW_UPDATE should be submitted, then
WINDOW_UPDATE is queued with the current received bytes count. If
the sole purpose is to decrease the local window size, consider to
use <a class="reference internal" href="nghttp2_session_set_local_window_size.html#c.nghttp2_session_set_local_window_size" title="nghttp2_session_set_local_window_size"><code class="xref c c-func docutils literal notranslate"><span class="pre">nghttp2_session_set_local_window_size()</span></code></a>.</p>
<p>If the <em>window_size_increment</em> is 0, the function does nothing and
returns 0.</p>
<p>This function returns 0 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_FLOW_CONTROL" title="NGHTTP2_ERR_FLOW_CONTROL"><code class="xref c c-macro docutils literal notranslate"><span class="pre">NGHTTP2_ERR_FLOW_CONTROL</span></code></a></dt>
<dd>The local window size overflow or gets negative.</dd>
<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>
</dd></dl>
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