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 189
 190   <div class="section" id="working-with-statistical-information-from-a-server">
 191 <h1>Working with statistical information from a server<a class="headerlink" href="#working-with-statistical-information-from-a-server" title="Permalink to this headline">¶</a></h1>
 192 <p>Get memcached statistics</p>
 193 <div class="section" id="synopsis">
 194 <span id="index-0"></span><h2>SYNOPSIS<a class="headerlink" href="#synopsis" title="Permalink to this headline">¶</a></h2>
 195 <dl class="docutils">
 196 <dt>#include &lt;libmemcached/memcached.h&gt;</dt>
 197 <dd>Compile and link with -lmemcached</dd>
 198 </dl>
 199 <dl class="type">
 200 <dt id="_CPPv417memcached_stat_st">
 201 <span id="_CPPv317memcached_stat_st"></span><span id="_CPPv217memcached_stat_st"></span><span id="memcached_stat_st"></span><em class="property">typedef </em><em class="property">struct</em> <a class="reference internal" href="#_CPPv417memcached_stat_st" title="memcached_stat_st">memcached_stat_st</a> <code class="descname">memcached_stat_st</code><a class="headerlink" href="#_CPPv417memcached_stat_st" title="Permalink to this definition">¶</a><br /></dt>
 202 <dd></dd></dl>
 203
 204 <dl class="type">
 205 <dt id="_CPPv417memcached_stat_fn">
 206 <span id="_CPPv317memcached_stat_fn"></span><span id="_CPPv217memcached_stat_fn"></span><span id="memcached_stat_fn"></span><em class="property">typedef </em><a class="reference internal" href="memcached_return_t.html#_CPPv418memcached_return_t" title="memcached_return_t">memcached_return_t</a> (*<code class="descname">memcached_stat_fn</code>)<span class="sig-paren">(</span><em class="property">const</em> memcached_instance_st *server, <em class="property">const</em> char *key, size_t key_length, <em class="property">const</em> char *value, size_t value_length, void *context<span class="sig-paren">)</span><a class="headerlink" href="#_CPPv417memcached_stat_fn" title="Permalink to this definition">¶</a><br /></dt>
 207 <dd><table class="docutils field-list" frame="void" rules="none">
 208 <col class="field-name" />
 209 <col class="field-body" />
 210 <tbody valign="top">
 211 <tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
 212 <li><strong>server</strong> -- pointer to the <code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">memcached_instance_st</span></code> being stat'ed</li>
 213 <li><strong>key</strong> -- the current key</li>
 214 <li><strong>key_length</strong> -- the length of the <code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">key</span></code> without any terminating zero</li>
 215 <li><strong>value</strong> -- the value read</li>
 216 <li><strong>value_length</strong> -- the length of the value without any terminating zero</li>
 217 <li><strong>context</strong> -- pointer to the user supplied context</li>
 218 </ul>
 219 </td>
 220 </tr>
 221 <tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first last"><a class="reference internal" href="memcached_return_t.html#_CPPv418memcached_return_t" title="memcached_return_t"><code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">memcached_return_t</span></code></a> indicating success</p>
 222 </td>
 223 </tr>
 224 </tbody>
 225 </table>
 226 </dd></dl>
 227
 228 <dl class="function">
 229 <dt id="_CPPv414memcached_statP12memcached_stPcP18memcached_return_t">
 230 <span id="_CPPv314memcached_statP12memcached_stPcP18memcached_return_t"></span><span id="_CPPv214memcached_statP12memcached_stPcP18memcached_return_t"></span><span id="memcached_stat__memcached_stP.cP.memcached_return_tP"></span><a class="reference internal" href="#_CPPv417memcached_stat_st" title="memcached_stat_st">memcached_stat_st</a> *<code class="descname">memcached_stat</code><span class="sig-paren">(</span><a class="reference internal" href="memcached_create.html#_CPPv412memcached_st" title="memcached_st">memcached_st</a> *<em>ptr</em>, char *<em>args</em>, <a class="reference internal" href="memcached_return_t.html#_CPPv418memcached_return_t" title="memcached_return_t">memcached_return_t</a> *<em>error</em><span class="sig-paren">)</span><a class="headerlink" href="#_CPPv414memcached_statP12memcached_stPcP18memcached_return_t" title="Permalink to this definition">¶</a><br /></dt>
 231 <dd><table class="docutils field-list" frame="void" rules="none">
 232 <col class="field-name" />
 233 <col class="field-body" />
 234 <tbody valign="top">
 235 <tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
 236 <li><strong>ptr</strong> -- pointer to an initialized <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> struct</li>
 237 <li><strong>args</strong> -- particular state object to query</li>
 238 <li><strong>error</strong> -- pointer to <a class="reference internal" href="memcached_return_t.html#_CPPv418memcached_return_t" title="memcached_return_t"><code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">memcached_return_t</span></code></a> indicating success</li>
 239 </ul>
 240 </td>
 241 </tr>
 242 <tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first last">array of <a class="reference internal" href="#_CPPv417memcached_stat_st" title="memcached_stat_st"><code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">memcached_stat_st</span></code></a> objects for all available servers</p>
 243 </td>
 244 </tr>
 245 </tbody>
 246 </table>
 247 </dd></dl>
 248
 249 <dl class="function">
 250 <dt id="_CPPv425memcached_stat_servernameP17memcached_stat_stPcPKc9in_port_t">
 251 <span id="_CPPv325memcached_stat_servernameP17memcached_stat_stPcPKc9in_port_t"></span><span id="_CPPv225memcached_stat_servernameP17memcached_stat_stPcPKc9in_port_t"></span><span id="memcached_stat_servername__memcached_stat_stP.cP.cCP.in_port_t"></span><a class="reference internal" href="memcached_return_t.html#_CPPv418memcached_return_t" title="memcached_return_t">memcached_return_t</a> <code class="descname">memcached_stat_servername</code><span class="sig-paren">(</span><a class="reference internal" href="#_CPPv417memcached_stat_st" title="memcached_stat_st">memcached_stat_st</a> *<em>stat</em>, char *<em>args</em>, <em class="property">const</em> char *<em>hostname</em>, in_port_t <em>port</em><span class="sig-paren">)</span><a class="headerlink" href="#_CPPv425memcached_stat_servernameP17memcached_stat_stPcPKc9in_port_t" title="Permalink to this definition">¶</a><br /></dt>
 252 <dd><table class="docutils field-list" frame="void" rules="none">
 253 <col class="field-name" />
 254 <col class="field-body" />
 255 <tbody valign="top">
 256 <tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
 257 <li><strong>stat</strong> -- pointer to a <a class="reference internal" href="#_CPPv417memcached_stat_st" title="memcached_stat_st"><code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">memcached_stat_st</span></code></a> struct to fill</li>
 258 <li><strong>args</strong> -- particular state object to query</li>
 259 <li><strong>hostname</strong> -- the hostname or IP address of the server to stat</li>
 260 <li><strong>port</strong> -- the port of the server to stat</li>
 261 </ul>
 262 </td>
 263 </tr>
 264 <tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first last"><a class="reference internal" href="memcached_return_t.html#_CPPv418memcached_return_t" title="memcached_return_t"><code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">memcached_return_t</span></code></a> indicating success</p>
 265 </td>
 266 </tr>
 267 </tbody>
 268 </table>
 269 </dd></dl>
 270
 271 <dl class="function">
 272 <dt id="_CPPv424memcached_stat_get_valueP12memcached_stP17memcached_stat_stPKcP18memcached_return_t">
 273 <span id="_CPPv324memcached_stat_get_valueP12memcached_stP17memcached_stat_stPKcP18memcached_return_t"></span><span id="_CPPv224memcached_stat_get_valueP12memcached_stP17memcached_stat_stPKcP18memcached_return_t"></span><span id="memcached_stat_get_value__memcached_stP.memcached_stat_stP.cCP.memcached_return_tP"></span>char *<code class="descname">memcached_stat_get_value</code><span class="sig-paren">(</span><a class="reference internal" href="memcached_create.html#_CPPv412memcached_st" title="memcached_st">memcached_st</a> *<em>ptr</em>, <a class="reference internal" href="#_CPPv417memcached_stat_st" title="memcached_stat_st">memcached_stat_st</a> *<em>stat</em>, <em class="property">const</em> char *<em>key</em>, <a class="reference internal" href="memcached_return_t.html#_CPPv418memcached_return_t" title="memcached_return_t">memcached_return_t</a> *<em>error</em><span class="sig-paren">)</span><a class="headerlink" href="#_CPPv424memcached_stat_get_valueP12memcached_stP17memcached_stat_stPKcP18memcached_return_t" title="Permalink to this definition">¶</a><br /></dt>
 274 <dd><table class="docutils field-list" frame="void" rules="none">
 275 <col class="field-name" />
 276 <col class="field-body" />
 277 <tbody valign="top">
 278 <tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
 279 <li><strong>ptr</strong> -- pointer to initialized <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> struct</li>
 280 <li><strong>stat</strong> -- pointer to initialized <a class="reference internal" href="#_CPPv417memcached_stat_st" title="memcached_stat_st"><code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">memcached_stat_st</span></code></a> struct</li>
 281 <li><strong>key</strong> -- the statistic to query</li>
 282 <li><strong>error</strong> -- pointer to <a class="reference internal" href="memcached_return_t.html#_CPPv418memcached_return_t" title="memcached_return_t"><code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">memcached_return_t</span></code></a> indicating success</li>
 283 </ul>
 284 </td>
 285 </tr>
 286 <tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first last">string value of the statistic</p>
 287 </td>
 288 </tr>
 289 </tbody>
 290 </table>
 291 </dd></dl>
 292
 293 <dl class="function">
 294 <dt id="_CPPv423memcached_stat_get_keysP12memcached_stP17memcached_stat_stP18memcached_return_t">
 295 <span id="_CPPv323memcached_stat_get_keysP12memcached_stP17memcached_stat_stP18memcached_return_t"></span><span id="_CPPv223memcached_stat_get_keysP12memcached_stP17memcached_stat_stP18memcached_return_t"></span><span id="memcached_stat_get_keys__memcached_stP.memcached_stat_stP.memcached_return_tP"></span>char **<code class="descname">memcached_stat_get_keys</code><span class="sig-paren">(</span><a class="reference internal" href="memcached_create.html#_CPPv412memcached_st" title="memcached_st">memcached_st</a> *<em>ptr</em>, <a class="reference internal" href="#_CPPv417memcached_stat_st" title="memcached_stat_st">memcached_stat_st</a> *<em>stat</em>, <a class="reference internal" href="memcached_return_t.html#_CPPv418memcached_return_t" title="memcached_return_t">memcached_return_t</a> *<em>error</em><span class="sig-paren">)</span><a class="headerlink" href="#_CPPv423memcached_stat_get_keysP12memcached_stP17memcached_stat_stP18memcached_return_t" title="Permalink to this definition">¶</a><br /></dt>
 296 <dd><table class="docutils field-list" frame="void" rules="none">
 297 <col class="field-name" />
 298 <col class="field-body" />
 299 <tbody valign="top">
 300 <tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
 301 <li><strong>ptr</strong> -- pointer to initialized <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> struct</li>
 302 <li><strong>stat</strong> -- pointer to initialized <a class="reference internal" href="#_CPPv417memcached_stat_st" title="memcached_stat_st"><code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">memcached_stat_st</span></code></a> struct</li>
 303 <li><strong>error</strong> -- pointer to <a class="reference internal" href="memcached_return_t.html#_CPPv418memcached_return_t" title="memcached_return_t"><code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">memcached_return_t</span></code></a> indicating success</li>
 304 </ul>
 305 </td>
 306 </tr>
 307 <tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first last">array of default keys probably available in the statistics</p>
 308 </td>
 309 </tr>
 310 </tbody>
 311 </table>
 312 </dd></dl>
 313
 314 <dl class="function">
 315 <dt id="_CPPv422memcached_stat_executeP12memcached_stPKc17memcached_stat_fnPv">
 316 <span id="_CPPv322memcached_stat_executeP12memcached_stPKc17memcached_stat_fnPv"></span><span id="_CPPv222memcached_stat_executeP12memcached_stPKc17memcached_stat_fnPv"></span><span id="memcached_stat_execute__memcached_stP.cCP.memcached_stat_fn.voidP"></span><a class="reference internal" href="memcached_return_t.html#_CPPv418memcached_return_t" title="memcached_return_t">memcached_return_t</a> <code class="descname">memcached_stat_execute</code><span class="sig-paren">(</span><a class="reference internal" href="memcached_create.html#_CPPv412memcached_st" title="memcached_st">memcached_st</a> *<em>ptr</em>, <em class="property">const</em> char *<em>args</em>, <a class="reference internal" href="#_CPPv417memcached_stat_fn" title="memcached_stat_fn">memcached_stat_fn</a> <em>func</em>, void *<em>context</em><span class="sig-paren">)</span><a class="headerlink" href="#_CPPv422memcached_stat_executeP12memcached_stPKc17memcached_stat_fnPv" title="Permalink to this definition">¶</a><br /></dt>
 317 <dd><table class="docutils field-list" frame="void" rules="none">
 318 <col class="field-name" />
 319 <col class="field-body" />
 320 <tbody valign="top">
 321 <tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
 322 <li><strong>ptr</strong> -- pointer to initialized <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> struct</li>
 323 <li><strong>args</strong> -- particular state object to query</li>
 324 <li><strong>func</strong> -- <a class="reference internal" href="#_CPPv417memcached_stat_fn" title="memcached_stat_fn"><code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">memcached_stat_fn</span></code></a> callback</li>
 325 <li><strong>context</strong> -- pointer to user supplied context</li>
 326 </ul>
 327 </td>
 328 </tr>
 329 <tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first last"><a class="reference internal" href="memcached_return_t.html#_CPPv418memcached_return_t" title="memcached_return_t"><code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">memcached_return_t</span></code></a> indication success</p>
 330 </td>
 331 </tr>
 332 </tbody>
 333 </table>
 334 </dd></dl>
 335
 336 </div>
 337 <div class="section" id="description">
 338 <h2>DESCRIPTION<a class="headerlink" href="#description" title="Permalink to this headline">¶</a></h2>
 339 <p><code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">libmemcached</span></code> has the ability to query a <em class="manpage"><a class="manpage reference external" href="https://linux.die.net/man/1/memcached">memcached(1)</a></em> server (or
 340 collection of servers) for their current state. Queries to find state return a
 341 <a class="reference internal" href="#_CPPv417memcached_stat_st" title="memcached_stat_st"><code class="xref cpp cpp-type docutils literal notranslate"><span class="pre">memcached_stat_st</span></code></a> structure. You are responsible for freeing this
 342 structure. While it is possible to access the structure directly it is not
 343 advisable. <a class="reference internal" href="#_CPPv424memcached_stat_get_valueP12memcached_stP17memcached_stat_stPKcP18memcached_return_t" title="memcached_stat_get_value"><code class="xref cpp cpp-func docutils literal notranslate"><span class="pre">memcached_stat_get_value()</span></code></a> has been provided to query the structure.</p>
 344 <p><a class="reference internal" href="#_CPPv422memcached_stat_executeP12memcached_stPKc17memcached_stat_fnPv" title="memcached_stat_execute"><code class="xref cpp cpp-func docutils literal notranslate"><span class="pre">memcached_stat_execute()</span></code></a> uses the servers found in <a class="reference internal" href="#_CPPv417memcached_stat_st" title="memcached_stat_st"><code class="xref cpp cpp-type docutils literal notranslate"><span class="pre">memcached_stat_st</span></code></a>
 345 and executes a &quot;stat&quot; command on each server. args is an optional argument that
 346 can be passed in to modify the behavior of &quot;stats&quot;. You will need to supply a
 347 callback function that will be supplied each pair of values returned by
 348 the memcached server.</p>
 349 <p><a class="reference internal" href="#_CPPv414memcached_statP12memcached_stPcP18memcached_return_t" title="memcached_stat"><code class="xref cpp cpp-func docutils literal notranslate"><span class="pre">memcached_stat()</span></code></a> fetches an array of <a class="reference internal" href="#_CPPv417memcached_stat_st" title="memcached_stat_st"><code class="xref cpp cpp-type docutils literal notranslate"><span class="pre">memcached_stat_st</span></code></a> structures
 350 containing the state of all available memcached servers. The return value must
 351 be freed by the calling application. If called with the
 352 <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> behavior set, a NULL value is returned and the
 353 error parameter is set to <a class="reference internal" href="memcached_return_t.html#_CPPv4N18memcached_return_t23MEMCACHED_NOT_SUPPORTEDE" title="MEMCACHED_NOT_SUPPORTED"><code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">MEMCACHED_NOT_SUPPORTED</span></code></a>.</p>
 354 <p><a class="reference internal" href="#_CPPv425memcached_stat_servernameP17memcached_stat_stPcPKc9in_port_t" title="memcached_stat_servername"><code class="xref cpp cpp-func docutils literal notranslate"><span class="pre">memcached_stat_servername()</span></code></a> can be used standalone without a
 355 <a class="reference internal" href="memcached_create.html#_CPPv412memcached_st" title="memcached_st"><code class="xref cpp cpp-type docutils literal notranslate"><span class="pre">memcached_st</span></code></a> to obtain the state of a particular server.  &quot;args&quot; is used
 356 to define a particular state object (a list of these are not provided for by either
 357 the <a class="reference internal" href="#_CPPv423memcached_stat_get_keysP12memcached_stP17memcached_stat_stP18memcached_return_t" title="memcached_stat_get_keys"><code class="xref cpp cpp-func docutils literal notranslate"><span class="pre">memcached_stat_get_keys()</span></code></a> call nor are they defined in the memcached
 358 protocol). You must specify the hostname and port of the server you want to
 359 obtain information on.</p>
 360 <p><a class="reference internal" href="#_CPPv424memcached_stat_get_valueP12memcached_stP17memcached_stat_stPKcP18memcached_return_t" title="memcached_stat_get_value"><code class="xref cpp cpp-func docutils literal notranslate"><span class="pre">memcached_stat_get_value()</span></code></a> returns the value of a particular state key.
 361 You specify the key you wish to obtain.  The key must be null terminated.</p>
 362 <p><a class="reference internal" href="#_CPPv423memcached_stat_get_keysP12memcached_stP17memcached_stat_stP18memcached_return_t" title="memcached_stat_get_keys"><code class="xref cpp cpp-func docutils literal notranslate"><span class="pre">memcached_stat_get_keys()</span></code></a> returns a list of keys that the server has state
 363 objects on. You are responsible for freeing this list.</p>
 364 <p>A command line tool, <code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">memstat</span></code>, is provided so that you do not have to write
 365 an application to do this.</p>
 366 </div>
 367 <div class="section" id="return-value">
 368 <h2>RETURN VALUE<a class="headerlink" href="#return-value" title="Permalink to this headline">¶</a></h2>
 369 <p>Varies, see particular functions.</p>
 370 <p>Any method returning a <a class="reference internal" href="#_CPPv417memcached_stat_st" title="memcached_stat_st"><code class="xref cpp cpp-type docutils literal notranslate"><span class="pre">memcached_stat_st</span></code></a> expects you to free the
 371 memory allocated for it.</p>
 372 </div>
 373 <div class="section" id="see-also">
 374 <h2>SEE ALSO<a class="headerlink" href="#see-also" title="Permalink to this headline">¶</a></h2>
 375 <ul class="simple">
 376 <li><em class="manpage"><a class="manpage reference external" href="https://linux.die.net/man/1/memcached">memcached(1)</a></em></li>
 377 <li><a class="reference internal" href="../libmemcached.html"><span class="doc">C/C++ Client Library for memcached</span></a></li>
 378 <li><a class="reference internal" href="memcached_strerror.html"><span class="doc">Converting Error Codes to Messages</span></a></li>
 379 </ul>
 380 </div>
 381 </div>
 382
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