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| e842803a MB |
22 | <a href="../libudev/index.html">gudev </a><span style="float:right">systemd 215</span><hr><div class="refentry"><a name="sd-readahead"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>sd-readahead — Reference implementation of APIs for |
| 23 | controlling boot-time read-ahead</p></div><div class="refsynopsisdiv"><h2>Synopsis</h2><div class="funcsynopsis"><pre class="funcsynopsisinfo">#include "sd-readahead.h"</pre></div></div><div class="refsect1"><a name="idm214198772224"></a><h2 id="Description">Description<a class="headerlink" title="Permalink to this headline" href="#Description">¶</a></h2><p><code class="filename">sd-readahead.c</code> and | |
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24 | <code class="filename">sd-readahead.h</code> provide a |
| 25 | reference implementation for APIs for controlling boot-time | |
| 26 | read-ahead, as implemented by the read-ahead subsystem | |
| 27 | of the | |
| 28 | <a href="systemd.html"><span class="citerefentry"><span class="refentrytitle">systemd</span>(1)</span></a> | |
| 29 | init system.</p><p>See | |
| 30 | <a href="sd_readahead.html"><span class="citerefentry"><span class="refentrytitle">sd_readahead</span>(3)</span></a> | |
| 31 | for more information about the function | |
| e842803a | 32 | implemented.</p></div><div class="refsect1"><a name="idm214198767552"></a><h2 id="Notes">Notes<a class="headerlink" title="Permalink to this headline" href="#Notes">¶</a></h2><p>This interface is provided by the reference |
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33 | implementation of APIs for controlling boot-time |
| 34 | read-ahead and distributed with the systemd | |
| 35 | package. The algorithms it implements are simple, and | |
| 36 | can easily be reimplemented in daemons if it is | |
| 37 | important to support this interface without using the | |
| 38 | reference implementation. See the respective function | |
| 60f067b4 | 39 | man pages for details.</p><p>In addition, for details about the algorithms, |
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40 | check the liberally licensed reference implementation |
| 41 | sources: | |
| 42 | <a class="ulink" href="http://cgit.freedesktop.org/systemd/systemd/plain/src/readahead/sd-readahead.c" target="_top">http://cgit.freedesktop.org/systemd/systemd/plain/src/readahead/sd-readahead.c</a> | |
| 43 | and <a class="ulink" href="http://cgit.freedesktop.org/systemd/systemd/plain/src/systemd/sd-readahead.h" target="_top">http://cgit.freedesktop.org/systemd/systemd/plain/src/systemd/sd-readahead.h</a></p><p>These APIs are implemented in the reference | |
| 44 | implementation's drop-in | |
| 45 | <code class="filename">sd-readahead.c</code> and | |
| 46 | <code class="filename">sd-readahead.h</code> files. It is | |
| 47 | recommended that applications consuming these APIs copy | |
| 48 | the implementation into their source tree, either | |
| 49 | verbatim or in excerpts. These interfaces are | |
| 50 | currently not available in a dynamic library.</p><p>The functions provided by this interface become | |
| 51 | NOPs when -DDISABLE_SYSTEMD is set during | |
| 52 | compilation. In addition, if | |
| 53 | <code class="filename">sd-readhead.c</code> is compiled on | |
| e842803a | 54 | non-Linux systems it becomes NOPs.</p></div><div class="refsect1"><a name="idm214198760976"></a><h2 id="See Also">See Also<a class="headerlink" title="Permalink to this headline" href="#See%20Also">¶</a></h2><p> |
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55 | <a href="systemd.html"><span class="citerefentry"><span class="refentrytitle">systemd</span>(1)</span></a>, |
| 56 | <a href="sd_readahead.html"><span class="citerefentry"><span class="refentrytitle">sd_readahead</span>(3)</span></a>, | |
| 57 | <a href="sd-daemon.html"><span class="citerefentry"><span class="refentrytitle">sd-daemon</span>(3)</span></a> | |
| 58 | </p></div></div></body></html> |