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109 <li class="toctree-l1"><a class="reference internal" href="../libmemcachedutil.html">Introduction</a></li>
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111 <li class="toctree-l2"><a class="reference internal" href="../libmemcachedutil/memcached_pool.html">Working with memcached pools</a></li>
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126 <p class="caption"><span class="caption-text">Client Applications</span></p>
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128 <li class="toctree-l1"><a class="reference internal" href="../bin/index.html">Client Applications</a><ul>
129 <li class="toctree-l2"><a class="reference internal" href="../bin/memcapable.html">memcapable - Checking a Memcached server capabilities and compatibility</a></li>
130 <li class="toctree-l2"><a class="reference internal" href="../bin/memcat.html">memcat - “cat” data from a server</a></li>
131 <li class="toctree-l2"><a class="reference internal" href="../bin/memcp.html">memcp - Copy data to a server</a></li>
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133 <li class="toctree-l2"><a class="reference internal" href="../bin/memerror.html">memerror - translate an error code to a string</a></li>
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136 <li class="toctree-l2"><a class="reference internal" href="../bin/memslap.html">memslap - Load testing and benchmarking a server</a></li>
137 <li class="toctree-l2"><a class="reference internal" href="../bin/memaslap.html">memaslap - Load testing and benchmarking a server</a></li>
138 <li class="toctree-l2"><a class="reference internal" href="../bin/memstat.html">memstat - Gather statistics from a server</a></li>
139 <li class="toctree-l2"><a class="reference internal" href="../bin/memexist.html">memexist - Check for the existence of a key</a></li>
140 <li class="toctree-l2"><a class="reference internal" href="../bin/memparse.html">memparse - Parse an option string</a></li>
141 <li class="toctree-l2"><a class="reference internal" href="../bin/memping.html">memping - Test to see if a server is available.</a></li>
142 <li class="toctree-l2"><a class="reference internal" href="../bin/memtouch.html">memtouch - Touches a key.</a></li>
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209 <div class="section" id="libmemcached-configuration">
210 <h1>libmemcached Configuration<a class="headerlink" href="#libmemcached-configuration" title="Permalink to this headline"></a></h1>
211 <div class="section" id="synopsis">
212 <h2>SYNOPSIS<a class="headerlink" href="#synopsis" title="Permalink to this headline"></a></h2>
213 <dl class="simple">
214 <dt>#include &lt;libmemcached-1.0/memcached.h&gt;</dt><dd><p>Compile and link with -lmemcached</p>
215 </dd>
216 </dl>
217 <dl class="function">
218 <dt id="_CPPv49memcachedPKc6size_t">
219 <span id="_CPPv39memcachedPKc6size_t"></span><span id="_CPPv29memcachedPKc6size_t"></span><span id="memcached__cCP.s"></span><a class="reference internal" href="memcached_create.html#_CPPv412memcached_st" title="memcached_st">memcached_st</a> *<code class="sig-name descname">memcached</code><span class="sig-paren">(</span><em class="property">const</em> char *<em>string</em>, size_t <em>string_length</em><span class="sig-paren">)</span><a class="headerlink" href="#_CPPv49memcachedPKc6size_t" title="Permalink to this definition"></a><br /></dt>
220 <dd></dd></dl>
221
222 <dl class="function">
223 <dt id="_CPPv432libmemcached_check_configurationPKc6size_tPc6size_t">
224 <span id="_CPPv332libmemcached_check_configurationPKc6size_tPc6size_t"></span><span id="_CPPv232libmemcached_check_configurationPKc6size_tPc6size_t"></span><span id="libmemcached_check_configuration__cCP.s.cP.s"></span><a class="reference internal" href="memcached_return_t.html#_CPPv418memcached_return_t" title="memcached_return_t">memcached_return_t</a> <code class="sig-name descname">libmemcached_check_configuration</code><span class="sig-paren">(</span><em class="property">const</em> char *<em>option_string</em>, size_t <em>length</em>, char *<em>error_buffer</em>, size_t <em>error_buffer_size</em><span class="sig-paren">)</span><a class="headerlink" href="#_CPPv432libmemcached_check_configurationPKc6size_tPc6size_t" title="Permalink to this definition"></a><br /></dt>
225 <dd></dd></dl>
226
227 </div>
228 <div class="section" id="description">
229 <h2>DESCRIPTION<a class="headerlink" href="#description" title="Permalink to this headline"></a></h2>
230 <p><code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">libmemcached</span></code> implements a custom language for configuring and modifying
231 servers. By passing in an option string you can generate a <a class="reference internal" href="memcached_create.html#_CPPv412memcached_st" title="memcached_st"><code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">memcached_st</span></code></a> object
232 that you can use in your application directly.</p>
233 <div class="section" id="general-options">
234 <h3>General Options:<a class="headerlink" href="#general-options" title="Permalink to this headline"></a></h3>
235 <dl class="describe">
236 <dt>
237 <code class="sig-name descname">--SERVER=&lt;servername&gt;:&lt;optional_port&gt;/?&lt;optional_weight&gt;</code></dt>
238 <dd><p>Provide a servername to be used by the client.</p>
239 <p>Providing a weight will cause weighting to occur with all hosts with each
240 server getting a default weight of 1.</p>
241 </dd></dl>
242
243 <dl class="describe">
244 <dt>
245 <code class="sig-name descname">--SOCKET=&quot;&lt;filepath&gt;/?&lt;optional_weight&gt;&quot;</code></dt>
246 <dd><p>Provide a filepath to a UNIX socket file. Providing a weight will cause
247 weighting to occur with all hosts with each server getting a default weight
248 of 1.</p>
249 </dd></dl>
250
251 <dl class="describe">
252 <dt>
253 <code class="sig-name descname">--VERIFY-KEY</code></dt>
254 <dd><p>Verify that keys that are being used fit within the design of the protocol
255 being used.</p>
256 </dd></dl>
257
258 <dl class="describe">
259 <dt>
260 <code class="sig-name descname">--REMOVE_FAILED_SERVERS</code></dt>
261 <dd><p>Enable the behavior <a class="reference internal" href="memcached_behavior.html#_CPPv4N20memcached_behavior_t40MEMCACHED_BEHAVIOR_REMOVE_FAILED_SERVERSE" title="MEMCACHED_BEHAVIOR_REMOVE_FAILED_SERVERS"><code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">MEMCACHED_BEHAVIOR_REMOVE_FAILED_SERVERS</span></code></a>.</p>
262 </dd></dl>
263
264 <dl class="describe">
265 <dt>
266 <code class="sig-name descname">--BINARY-PROTOCOL</code></dt>
267 <dd><p>Force all connections to use the binary protocol.</p>
268 </dd></dl>
269
270 <dl class="describe">
271 <dt>
272 <code class="sig-name descname">--BUFFER-REQUESTS</code></dt>
273 <dd><p>Please see <a class="reference internal" href="memcached_behavior.html#_CPPv4N20memcached_behavior_t34MEMCACHED_BEHAVIOR_BUFFER_REQUESTSE" title="MEMCACHED_BEHAVIOR_BUFFER_REQUESTS"><code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">MEMCACHED_BEHAVIOR_BUFFER_REQUESTS</span></code></a>.</p>
274 </dd></dl>
275
276 <dl class="describe">
277 <dt>
278 <code class="sig-name descname">--CONFIGURE-FILE=</code></dt>
279 <dd><p>Provide a configuration file to be used to load requests. Beware that by
280 using a configuration file <code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">libmemcached</span></code> will reset <a class="reference internal" href="memcached_create.html#_CPPv412memcached_st" title="memcached_st"><code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">memcached_st</span></code></a> based
281 on information only contained in the file.</p>
282 </dd></dl>
283
284 <dl class="describe">
285 <dt>
286 <code class="sig-name descname">--CONNECT-TIMEOUT=</code></dt>
287 <dd><p>See <a class="reference internal" href="memcached_behavior.html#_CPPv422memcached_behavior_setP12memcached_st20memcached_behavior_t8uint64_t" title="memcached_behavior_set"><code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">memcached_behavior_set()</span></code></a> for <a class="reference internal" href="memcached_behavior.html#_CPPv4N20memcached_behavior_t34MEMCACHED_BEHAVIOR_CONNECT_TIMEOUTE" title="MEMCACHED_BEHAVIOR_CONNECT_TIMEOUT"><code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">MEMCACHED_BEHAVIOR_CONNECT_TIMEOUT</span></code></a>.</p>
288 </dd></dl>
289
290 <dl class="describe">
291 <dt>
292 <code class="sig-name descname">--DISTRIBUTION=</code></dt>
293 <dd><p>Set the distribution model used by the client.
294 See <a class="reference internal" href="memcached_behavior.html#_CPPv422memcached_behavior_setP12memcached_st20memcached_behavior_t8uint64_t" title="memcached_behavior_set"><code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">memcached_behavior_set()</span></code></a> for more details.</p>
295 </dd></dl>
296
297 <dl class="describe">
298 <dt>
299 <code class="sig-name descname">--HASH=</code></dt>
300 <dd><p>Set the hashing algorithm used for placing keys on servers.</p>
301 </dd></dl>
302
303 <dl class="describe">
304 <dt>
305 <code class="sig-name descname">--HASH-WITH-NAMESPACE</code></dt>
306 <dd><p>When enabled the prefix key will be added to the key when determining which
307 server to store the data in.</p>
308 </dd></dl>
309
310 <dl class="describe">
311 <dt>
312 <code class="sig-name descname">--NOREPLY</code></dt>
313 <dd><p>Enable “no reply” for all calls that support this. It is highly recommended
314 that you use this option with the binary protocol only.</p>
315 </dd></dl>
316
317 <dl class="describe">
318 <dt>
319 <code class="sig-name descname">--NUMBER-OF-REPLICAS=</code></dt>
320 <dd><p>Set the number of servers that keys will be replicated to.</p>
321 </dd></dl>
322
323 <dl class="describe">
324 <dt>
325 <code class="sig-name descname">--RANDOMIZE-REPLICA-READ</code></dt>
326 <dd><p>Select randomly the server within the replication pool to read from.</p>
327 </dd></dl>
328
329 <dl class="describe">
330 <dt>
331 <code class="sig-name descname">--SORT-HOSTS</code></dt>
332 <dd><p>When adding new servers always calculate their distribution based on sorted
333 naming order.</p>
334 </dd></dl>
335
336 <dl class="describe">
337 <dt>
338 <code class="sig-name descname">--SUPPORT-CAS</code></dt>
339 <dd><p>See <a class="reference internal" href="memcached_behavior.html#_CPPv422memcached_behavior_setP12memcached_st20memcached_behavior_t8uint64_t" title="memcached_behavior_set"><code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">memcached_behavior_set()</span></code></a> for <a class="reference internal" href="memcached_behavior.html#_CPPv4N20memcached_behavior_t30MEMCACHED_BEHAVIOR_SUPPORT_CASE" title="MEMCACHED_BEHAVIOR_SUPPORT_CAS"><code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">MEMCACHED_BEHAVIOR_SUPPORT_CAS</span></code></a></p>
340 </dd></dl>
341
342 <dl class="describe">
343 <dt>
344 <code class="sig-name descname">--USE-UDP</code></dt>
345 <dd><p>See <a class="reference internal" href="memcached_behavior.html#_CPPv422memcached_behavior_setP12memcached_st20memcached_behavior_t8uint64_t" title="memcached_behavior_set"><code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">memcached_behavior_set()</span></code></a> for <a class="reference internal" href="memcached_behavior.html#_CPPv4N20memcached_behavior_t26MEMCACHED_BEHAVIOR_USE_UDPE" title="MEMCACHED_BEHAVIOR_USE_UDP"><code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">MEMCACHED_BEHAVIOR_USE_UDP</span></code></a></p>
346 </dd></dl>
347
348 <dl class="describe">
349 <dt>
350 <code class="sig-name descname">--NAMESPACE=</code></dt>
351 <dd><p>A namespace is a container that provides context for keys, only other
352 requests that know the namespace can access these values. This is
353 accomplished by prepending the namespace value to all keys.</p>
354 </dd></dl>
355
356 </div>
357 <div class="section" id="memcached-pool-options">
358 <h3>Memcached Pool Options:<a class="headerlink" href="#memcached-pool-options" title="Permalink to this headline"></a></h3>
359 <dl class="describe">
360 <dt>
361 <code class="sig-name descname">--POOL-MIN</code></dt>
362 <dd><p>Initial size of pool.</p>
363 </dd></dl>
364
365 <dl class="describe">
366 <dt>
367 <code class="sig-name descname">--POOL-MAX</code></dt>
368 <dd><p>Maximize size of the pool.</p>
369 </dd></dl>
370
371 </div>
372 <div class="section" id="i-o-options">
373 <h3>I/O Options:<a class="headerlink" href="#i-o-options" title="Permalink to this headline"></a></h3>
374 <dl class="describe">
375 <dt>
376 <code class="sig-name descname">--TCP-NODELAY</code></dt>
377 <dd><p>See <a class="reference internal" href="memcached_behavior.html#_CPPv422memcached_behavior_setP12memcached_st20memcached_behavior_t8uint64_t" title="memcached_behavior_set"><code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">memcached_behavior_set()</span></code></a> for <a class="reference internal" href="memcached_behavior.html#_CPPv4N20memcached_behavior_t30MEMCACHED_BEHAVIOR_TCP_NODELAYE" title="MEMCACHED_BEHAVIOR_TCP_NODELAY"><code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">MEMCACHED_BEHAVIOR_TCP_NODELAY</span></code></a></p>
378 </dd></dl>
379
380 <dl class="describe">
381 <dt>
382 <code class="sig-name descname">--TCP-KEEPALIVE</code></dt>
383 <dd><p>See <a class="reference internal" href="memcached_behavior.html#_CPPv422memcached_behavior_setP12memcached_st20memcached_behavior_t8uint64_t" title="memcached_behavior_set"><code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">memcached_behavior_set()</span></code></a> for <code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">MEMCACHED_BEHAVIOR_TCP_KEEPALIVE</span></code></p>
384 </dd></dl>
385
386 <dl class="describe">
387 <dt>
388 <code class="sig-name descname">--RETRY-TIMEOUT=</code></dt>
389 <dd><p>See <a class="reference internal" href="memcached_behavior.html#_CPPv422memcached_behavior_setP12memcached_st20memcached_behavior_t8uint64_t" title="memcached_behavior_set"><code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">memcached_behavior_set()</span></code></a> for <a class="reference internal" href="memcached_behavior.html#_CPPv4N20memcached_behavior_t32MEMCACHED_BEHAVIOR_RETRY_TIMEOUTE" title="MEMCACHED_BEHAVIOR_RETRY_TIMEOUT"><code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">MEMCACHED_BEHAVIOR_RETRY_TIMEOUT</span></code></a></p>
390 </dd></dl>
391
392 <dl class="describe">
393 <dt>
394 <code class="sig-name descname">--SERVER-FAILURE-LIMIT=</code></dt>
395 <dd><p>See <a class="reference internal" href="memcached_behavior.html#_CPPv422memcached_behavior_setP12memcached_st20memcached_behavior_t8uint64_t" title="memcached_behavior_set"><code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">memcached_behavior_set()</span></code></a> for <a class="reference internal" href="memcached_behavior.html#_CPPv4N20memcached_behavior_t39MEMCACHED_BEHAVIOR_SERVER_FAILURE_LIMITE" title="MEMCACHED_BEHAVIOR_SERVER_FAILURE_LIMIT"><code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">MEMCACHED_BEHAVIOR_SERVER_FAILURE_LIMIT</span></code></a></p>
396 </dd></dl>
397
398 <dl class="describe">
399 <dt>
400 <code class="sig-name descname">--SND-TIMEOUT=</code></dt>
401 <dd><p>See <a class="reference internal" href="memcached_behavior.html#_CPPv422memcached_behavior_setP12memcached_st20memcached_behavior_t8uint64_t" title="memcached_behavior_set"><code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">memcached_behavior_set()</span></code></a> for <a class="reference internal" href="memcached_behavior.html#_CPPv4N20memcached_behavior_t30MEMCACHED_BEHAVIOR_SND_TIMEOUTE" title="MEMCACHED_BEHAVIOR_SND_TIMEOUT"><code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">MEMCACHED_BEHAVIOR_SND_TIMEOUT</span></code></a></p>
402 </dd></dl>
403
404 <dl class="describe">
405 <dt>
406 <code class="sig-name descname">--SOCKET-RECV-SIZE=</code></dt>
407 <dd><p>See <a class="reference internal" href="memcached_behavior.html#_CPPv422memcached_behavior_setP12memcached_st20memcached_behavior_t8uint64_t" title="memcached_behavior_set"><code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">memcached_behavior_set()</span></code></a> for <a class="reference internal" href="memcached_behavior.html#_CPPv4N20memcached_behavior_t35MEMCACHED_BEHAVIOR_SOCKET_RECV_SIZEE" title="MEMCACHED_BEHAVIOR_SOCKET_RECV_SIZE"><code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">MEMCACHED_BEHAVIOR_SOCKET_RECV_SIZE</span></code></a></p>
408 </dd></dl>
409
410 <dl class="describe">
411 <dt>
412 <code class="sig-name descname">--SOCKET-SEND-SIZE=</code></dt>
413 <dd><p>See <a class="reference internal" href="memcached_behavior.html#_CPPv422memcached_behavior_setP12memcached_st20memcached_behavior_t8uint64_t" title="memcached_behavior_set"><code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">memcached_behavior_set()</span></code></a> for <a class="reference internal" href="memcached_behavior.html#_CPPv4N20memcached_behavior_t35MEMCACHED_BEHAVIOR_SOCKET_SEND_SIZEE" title="MEMCACHED_BEHAVIOR_SOCKET_SEND_SIZE"><code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">MEMCACHED_BEHAVIOR_SOCKET_SEND_SIZE</span></code></a></p>
414 </dd></dl>
415
416 <dl class="describe">
417 <dt>
418 <code class="sig-name descname">--POLL-TIMEOUT=</code></dt>
419 <dd><p>Set the timeout used by <em class="manpage"><a class="manpage reference external" href="http://man7.org/linux/man-pages/man3/poll.3.html">poll(3)</a></em>.</p>
420 </dd></dl>
421
422 <dl class="describe">
423 <dt>
424 <code class="sig-name descname">--IO-BYTES-WATERMARK=</code></dt>
425 <dd></dd></dl>
426
427 <dl class="describe">
428 <dt>
429 <code class="sig-name descname">--IO-KEY-PREFETCH=</code></dt>
430 <dd></dd></dl>
431
432 <dl class="describe">
433 <dt>
434 <code class="sig-name descname">--IO-MSG-WATERMARK=</code></dt>
435 <dd></dd></dl>
436
437 <dl class="describe">
438 <dt>
439 <code class="sig-name descname">--TCP-KEEPIDLE</code></dt>
440 <dd></dd></dl>
441
442 <dl class="describe">
443 <dt>
444 <code class="sig-name descname">--RCV-TIMEOUT=</code></dt>
445 <dd></dd></dl>
446
447 </div>
448 <div class="section" id="other-options">
449 <h3>Other Options:<a class="headerlink" href="#other-options" title="Permalink to this headline"></a></h3>
450 <dl class="describe">
451 <dt>
452 <code class="sig-name descname">INCLUDE</code></dt>
453 <dd><p>Include a file in configuration.
454 Unlike –CONFIGURE-FILE= this will not reset <a class="reference internal" href="memcached_create.html#_CPPv412memcached_st" title="memcached_st"><code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">memcached_st</span></code></a>.</p>
455 </dd></dl>
456
457 <dl class="describe">
458 <dt>
459 <code class="sig-name descname">RESET</code></dt>
460 <dd><p>Reset <a class="reference internal" href="memcached_create.html#_CPPv412memcached_st" title="memcached_st"><code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">memcached_st</span></code></a> and continue to process.</p>
461 </dd></dl>
462
463 <dl class="describe">
464 <dt>
465 <code class="sig-name descname">END</code></dt>
466 <dd><p>End configuration processing.</p>
467 </dd></dl>
468
469 <dl class="describe">
470 <dt>
471 <code class="sig-name descname">ERROR</code></dt>
472 <dd><p>End configuration processing and throw an error.</p>
473 </dd></dl>
474
475 </div>
476 </div>
477 <div class="section" id="environment">
478 <h2>ENVIRONMENT<a class="headerlink" href="#environment" title="Permalink to this headline"></a></h2>
479 <dl class="envvar">
480 <dt id="envvar-LIBMEMCACHED">
481 <code class="sig-name descname">LIBMEMCACHED</code><a class="headerlink" href="#envvar-LIBMEMCACHED" title="Permalink to this definition"></a></dt>
482 <dd></dd></dl>
483
484 </div>
485 <div class="section" id="return-value">
486 <h2>RETURN VALUE<a class="headerlink" href="#return-value" title="Permalink to this headline"></a></h2>
487 <p><a class="reference internal" href="#_CPPv49memcachedPKc6size_t" title="memcached"><code class="xref cpp cpp-func docutils literal notranslate"><span class="pre">memcached()</span></code></a> returns a pointer to the memcached_st that was
488 created (or initialized). On an allocation failure, it returns NULL.</p>
489 </div>
490 <div class="section" id="example">
491 <h2>EXAMPLE<a class="headerlink" href="#example" title="Permalink to this headline"></a></h2>
492 <div class="highlight-c notranslate"><div class="highlight"><pre><span></span><span class="k">const</span> <span class="kt">char</span> <span class="o">*</span><span class="n">config_string</span><span class="o">=</span>
493 <span class="s">&quot;--SERVER=host10.example.com &quot;</span>
494 <span class="s">&quot;--SERVER=host11.example.com &quot;</span>
495 <span class="s">&quot;--SERVER=host10.example.com&quot;</span><span class="p">;</span>
496 <span class="n">memcached_st</span> <span class="o">*</span><span class="n">memc</span><span class="o">=</span> <span class="n">memcached</span><span class="p">(</span><span class="n">config_string</span><span class="p">,</span> <span class="n">strlen</span><span class="p">(</span><span class="n">config_string</span><span class="p">));</span>
497 <span class="p">{</span>
498 <span class="c1">// ...</span>
499 <span class="p">}</span>
500 <span class="n">memcached_free</span><span class="p">(</span><span class="n">memc</span><span class="p">);</span>
501 </pre></div>
502 </div>
503 </div>
504 <div class="section" id="see-also">
505 <h2>SEE ALSO<a class="headerlink" href="#see-also" title="Permalink to this headline"></a></h2>
506 <ul class="simple">
507 <li><p><em class="manpage"><a class="manpage reference external" href="http://man7.org/linux/man-pages/man1/memcached.1.html">memcached(1)</a></em></p></li>
508 <li><p><a class="reference internal" href="../libmemcached.html"><span class="doc">C/C++ Client Library for memcached</span></a></p></li>
509 <li><p><a class="reference internal" href="memcached_strerror.html"><span class="doc">Converting Error Codes to Messages</span></a></p></li>
510 </ul>
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