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  54             <a href="index.html" class="icon icon-home"> libmemcached
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  63               <div class="version">
  64                 1.0
  65               </div>
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  88               <p class="caption"><span class="caption-text">Basics</span></p>
  89 <ul>
  90 <li class="toctree-l1"><a class="reference internal" href="libmemcached.html">Introducing the C Client Library for memcached</a><ul>
  91 <li class="toctree-l2"><a class="reference internal" href="libmemcached.html#synopsis">SYNOPSIS</a></li>
  92 <li class="toctree-l2"><a class="reference internal" href="libmemcached.html#description">DESCRIPTION</a></li>
  93 <li class="toctree-l2"><a class="reference internal" href="libmemcached.html#constants">CONSTANTS</a></li>
  94 <li class="toctree-l2"><a class="reference internal" href="libmemcached.html#threads-and-processes">THREADS AND PROCESSES</a></li>
  95 <li class="toctree-l2"><a class="reference internal" href="libmemcached.html#see-also">SEE ALSO</a></li>
  96 </ul>
  97 </li>
  98 <li class="toctree-l1"><a class="reference internal" href="versioning.html">Versioning</a></li>
  99 <li class="toctree-l1"><a class="reference internal" href="memcached_create.html">Creating and destroying a memcached_st</a><ul>
 100 <li class="toctree-l2"><a class="reference internal" href="memcached_create.html#synopsis">SYNOPSIS</a></li>
 101 <li class="toctree-l2"><a class="reference internal" href="memcached_create.html#description">DESCRIPTION</a></li>
 102 <li class="toctree-l2"><a class="reference internal" href="memcached_create.html#return">RETURN</a></li>
 103 <li class="toctree-l2"><a class="reference internal" href="memcached_create.html#see-also">SEE ALSO</a></li>
 104 </ul>
 105 </li>
 106 <li class="toctree-l1"><a class="reference internal" href="libmemcached_examples.html">Examples</a><ul>
 107 <li class="toctree-l2"><a class="reference internal" href="libmemcached_examples.html#description">DESCRIPTION</a></li>
 108 <li class="toctree-l2"><a class="reference internal" href="libmemcached_examples.html#connecting-to-servers">Connecting to servers</a></li>
 109 <li class="toctree-l2"><a class="reference internal" href="libmemcached_examples.html#creating-a-pool-of-servers">Creating a pool of servers</a></li>
 110 <li class="toctree-l2"><a class="reference internal" href="libmemcached_examples.html#adding-a-value-to-the-server">Adding a value to the server</a></li>
 111 <li class="toctree-l2"><a class="reference internal" href="libmemcached_examples.html#fetching-multiple-values">Fetching multiple values</a></li>
 112 <li class="toctree-l2"><a class="reference internal" href="libmemcached_examples.html#see-also">SEE ALSO</a></li>
 113 </ul>
 114 </li>
 115 <li class="toctree-l1"><a class="reference internal" href="libmemcached_configuration.html">Configuring Libmemcached</a><ul>
 116 <li class="toctree-l2"><a class="reference internal" href="libmemcached_configuration.html#synopsis">SYNOPSIS</a></li>
 117 <li class="toctree-l2"><a class="reference internal" href="libmemcached_configuration.html#description">DESCRIPTION</a></li>
 118 <li class="toctree-l2"><a class="reference internal" href="libmemcached_configuration.html#environment">ENVIRONMENT</a></li>
 119 <li class="toctree-l2"><a class="reference internal" href="libmemcached_configuration.html#return">RETURN</a></li>
 120 <li class="toctree-l2"><a class="reference internal" href="libmemcached_configuration.html#example">EXAMPLE</a></li>
 121 <li class="toctree-l2"><a class="reference internal" href="libmemcached_configuration.html#see-also">SEE ALSO</a></li>
 122 </ul>
 123 </li>
 124 <li class="toctree-l1"><a class="reference internal" href="libmemcached/memcached_last_error_message.html">Retrieving errors</a><ul>
 125 <li class="toctree-l2"><a class="reference internal" href="libmemcached/memcached_last_error_message.html#synopsis">SYNOPSIS</a></li>
 126 <li class="toctree-l2"><a class="reference internal" href="libmemcached/memcached_last_error_message.html#description">DESCRIPTION</a></li>
 127 <li class="toctree-l2"><a class="reference internal" href="libmemcached/memcached_last_error_message.html#return">RETURN</a></li>
 128 <li class="toctree-l2"><a class="reference internal" href="libmemcached/memcached_last_error_message.html#see-also">SEE ALSO</a></li>
 129 </ul>
 130 </li>
 131 </ul>
 132 <p class="caption"><span class="caption-text">Working with Data</span></p>
 133 <ul class="current">
 134 <li class="toctree-l1"><a class="reference internal" href="memcached_auto.html">Incrementing and Decrementing Values</a><ul>
 135 <li class="toctree-l2"><a class="reference internal" href="memcached_auto.html#synopsis">SYNOPSIS</a></li>
 136 <li class="toctree-l2"><a class="reference internal" href="memcached_auto.html#description">DESCRIPTION</a></li>
 137 <li class="toctree-l2"><a class="reference internal" href="memcached_auto.html#return">RETURN</a></li>
 138 <li class="toctree-l2"><a class="reference internal" href="memcached_auto.html#see-also">SEE ALSO</a></li>
 139 </ul>
 140 </li>
 141 <li class="toctree-l1"><a class="reference internal" href="memcached_delete.html">Deleting data from a server</a><ul>
 142 <li class="toctree-l2"><a class="reference internal" href="memcached_delete.html#synopsis">SYNOPSIS</a></li>
 143 <li class="toctree-l2"><a class="reference internal" href="memcached_delete.html#description">DESCRIPTION</a></li>
 144 <li class="toctree-l2"><a class="reference internal" href="memcached_delete.html#return">RETURN</a></li>
 145 <li class="toctree-l2"><a class="reference internal" href="memcached_delete.html#see-also">SEE ALSO</a></li>
 146 </ul>
 147 </li>
 148 <li class="toctree-l1"><a class="reference internal" href="libmemcached/memcached_exist.html">Determine if a keys exists.</a><ul>
 149 <li class="toctree-l2"><a class="reference internal" href="libmemcached/memcached_exist.html#synopsis">SYNOPSIS</a></li>
 150 <li class="toctree-l2"><a class="reference internal" href="libmemcached/memcached_exist.html#description">DESCRIPTION</a></li>
 151 <li class="toctree-l2"><a class="reference internal" href="libmemcached/memcached_exist.html#return">RETURN</a></li>
 152 <li class="toctree-l2"><a class="reference internal" href="libmemcached/memcached_exist.html#see-also">SEE ALSO</a></li>
 153 </ul>
 154 </li>
 155 <li class="toctree-l1"><a class="reference internal" href="memcached_flush_buffers.html">Flushing client buffers</a><ul>
 156 <li class="toctree-l2"><a class="reference internal" href="memcached_flush_buffers.html#synopsis">SYNOPSIS</a></li>
 157 <li class="toctree-l2"><a class="reference internal" href="memcached_flush_buffers.html#description">DESCRIPTION</a></li>
 158 <li class="toctree-l2"><a class="reference internal" href="memcached_flush_buffers.html#return">RETURN</a></li>
 159 <li class="toctree-l2"><a class="reference internal" href="memcached_flush_buffers.html#see-also">SEE ALSO</a></li>
 160 </ul>
 161 </li>
 162 <li class="toctree-l1"><a class="reference internal" href="memcached_flush.html">Wiping clean the contents of a server</a><ul>
 163 <li class="toctree-l2"><a class="reference internal" href="memcached_flush.html#synopsis">SYNOPSIS</a></li>
 164 <li class="toctree-l2"><a class="reference internal" href="memcached_flush.html#description">DESCRIPTION</a></li>
 165 <li class="toctree-l2"><a class="reference internal" href="memcached_flush.html#return">RETURN</a></li>
 166 <li class="toctree-l2"><a class="reference internal" href="memcached_flush.html#see-also">SEE ALSO</a></li>
 167 </ul>
 168 </li>
 169 <li class="toctree-l1"><a class="reference internal" href="memcached_get.html">Retrieving data from the server</a><ul>
 170 <li class="toctree-l2"><a class="reference internal" href="memcached_get.html#synopsis">SYNOPSIS</a></li>
 171 <li class="toctree-l2"><a class="reference internal" href="memcached_get.html#description">DESCRIPTION</a></li>
 172 <li class="toctree-l2"><a class="reference internal" href="memcached_get.html#return">RETURN</a></li>
 173 <li class="toctree-l2"><a class="reference internal" href="memcached_get.html#see-also">SEE ALSO</a></li>
 174 </ul>
 175 </li>
 176 <li class="toctree-l1"><a class="reference internal" href="memcached_result_st.html">Working with result sets</a><ul>
 177 <li class="toctree-l2"><a class="reference internal" href="memcached_result_st.html#synopsis">SYNOPSIS</a></li>
 178 <li class="toctree-l2"><a class="reference internal" href="memcached_result_st.html#description">DESCRIPTION</a></li>
 179 <li class="toctree-l2"><a class="reference internal" href="memcached_result_st.html#return">RETURN</a></li>
 180 <li class="toctree-l2"><a class="reference internal" href="memcached_result_st.html#see-also">SEE ALSO</a></li>
 181 </ul>
 182 </li>
 183 <li class="toctree-l1 current"><a class="current reference internal" href="#">Store, replace, add, or atomically add data to the server</a><ul>
 184 <li class="toctree-l2"><a class="reference internal" href="#synopsis">SYNOPSIS</a></li>
 185 <li class="toctree-l2"><a class="reference internal" href="#description">DESCRIPTION</a></li>
 186 <li class="toctree-l2"><a class="reference internal" href="#return">RETURN</a></li>
 187 <li class="toctree-l2"><a class="reference internal" href="#see-also">SEE ALSO</a></li>
 188 </ul>
 189 </li>
 190 <li class="toctree-l1"><a class="reference internal" href="memcached_append.html">Appending or Prepending to data on the server</a><ul>
 191 <li class="toctree-l2"><a class="reference internal" href="memcached_append.html#synopsis">SYNOPSIS</a></li>
 192 <li class="toctree-l2"><a class="reference internal" href="memcached_append.html#description">DESCRIPTION</a></li>
 193 <li class="toctree-l2"><a class="reference internal" href="memcached_append.html#return">RETURN</a></li>
 194 <li class="toctree-l2"><a class="reference internal" href="memcached_append.html#see-also">SEE ALSO</a></li>
 195 </ul>
 196 </li>
 197 <li class="toctree-l1"><a class="reference internal" href="memcached_cas.html">Working with data on the server in an atomic fashion</a><ul>
 198 <li class="toctree-l2"><a class="reference internal" href="memcached_cas.html#synopsis">SYNOPSIS</a></li>
 199 <li class="toctree-l2"><a class="reference internal" href="memcached_cas.html#description">DESCRIPTION</a></li>
 200 <li class="toctree-l2"><a class="reference internal" href="memcached_cas.html#return">RETURN</a></li>
 201 <li class="toctree-l2"><a class="reference internal" href="memcached_cas.html#see-also">SEE ALSO</a></li>
 202 </ul>
 203 </li>
 204 </ul>
 205 <p class="caption"><span class="caption-text">Advanced Topics</span></p>
 206 <ul>
 207 <li class="toctree-l1"><a class="reference internal" href="libmemcached-1.0/memcached_set_encoding_key.html">Set encryption key</a><ul>
 208 <li class="toctree-l2"><a class="reference internal" href="libmemcached-1.0/memcached_set_encoding_key.html#synopsis">SYNOPSIS</a></li>
 209 <li class="toctree-l2"><a class="reference internal" href="libmemcached-1.0/memcached_set_encoding_key.html#description">DESCRIPTION</a></li>
 210 <li class="toctree-l2"><a class="reference internal" href="libmemcached-1.0/memcached_set_encoding_key.html#return">RETURN</a></li>
 211 <li class="toctree-l2"><a class="reference internal" href="libmemcached-1.0/memcached_set_encoding_key.html#see-also">SEE ALSO</a></li>
 212 </ul>
 213 </li>
 214 <li class="toctree-l1"><a class="reference internal" href="memcached_behavior.html">Modifying how the driver behaves</a><ul>
 215 <li class="toctree-l2"><a class="reference internal" href="memcached_behavior.html#synopsis">SYNOPSIS</a></li>
 216 <li class="toctree-l2"><a class="reference internal" href="memcached_behavior.html#description">DESCRIPTION</a></li>
 217 <li class="toctree-l2"><a class="reference internal" href="memcached_behavior.html#return">RETURN</a></li>
 218 <li class="toctree-l2"><a class="reference internal" href="memcached_behavior.html#notes">NOTES</a></li>
 219 <li class="toctree-l2"><a class="reference internal" href="memcached_behavior.html#see-also">SEE ALSO</a></li>
 220 </ul>
 221 </li>
 222 <li class="toctree-l1"><a class="reference internal" href="memcached_callback.html">Setting callbacks</a><ul>
 223 <li class="toctree-l2"><a class="reference internal" href="memcached_callback.html#synopsis">SYNOPSIS</a></li>
 224 <li class="toctree-l2"><a class="reference internal" href="memcached_callback.html#description">DESCRIPTION</a></li>
 225 <li class="toctree-l2"><a class="reference internal" href="memcached_callback.html#return">RETURN</a></li>
 226 <li class="toctree-l2"><a class="reference internal" href="memcached_callback.html#see-also">SEE ALSO</a></li>
 227 </ul>
 228 </li>
 229 <li class="toctree-l1"><a class="reference internal" href="memcached_dump.html">Dumping data from a server</a><ul>
 230 <li class="toctree-l2"><a class="reference internal" href="memcached_dump.html#synopsis">SYNOPSIS</a></li>
 231 <li class="toctree-l2"><a class="reference internal" href="memcached_dump.html#description">DESCRIPTION</a></li>
 232 <li class="toctree-l2"><a class="reference internal" href="memcached_dump.html#return">RETURN</a></li>
 233 <li class="toctree-l2"><a class="reference internal" href="memcached_dump.html#see-also">SEE ALSO</a></li>
 234 </ul>
 235 </li>
 236 <li class="toctree-l1"><a class="reference internal" href="memcached_generate_hash_value.html">Generating hash values directly</a><ul>
 237 <li class="toctree-l2"><a class="reference internal" href="memcached_generate_hash_value.html#synopsis">SYNOPSIS</a></li>
 238 <li class="toctree-l2"><a class="reference internal" href="memcached_generate_hash_value.html#description">DESCRIPTION</a></li>
 239 <li class="toctree-l2"><a class="reference internal" href="memcached_generate_hash_value.html#return">RETURN</a></li>
 240 <li class="toctree-l2"><a class="reference internal" href="memcached_generate_hash_value.html#see-also">SEE ALSO</a></li>
 241 </ul>
 242 </li>
 243 <li class="toctree-l1"><a class="reference internal" href="memcached_memory_allocators.html">Use custom allocators for embedded usage</a><ul>
 244 <li class="toctree-l2"><a class="reference internal" href="memcached_memory_allocators.html#synopsis">SYNOPSIS</a></li>
 245 <li class="toctree-l2"><a class="reference internal" href="memcached_memory_allocators.html#description">DESCRIPTION</a></li>
 246 <li class="toctree-l2"><a class="reference internal" href="memcached_memory_allocators.html#notes">NOTES</a></li>
 247 <li class="toctree-l2"><a class="reference internal" href="memcached_memory_allocators.html#return">RETURN</a></li>
 248 <li class="toctree-l2"><a class="reference internal" href="memcached_memory_allocators.html#see-also">SEE ALSO</a></li>
 249 </ul>
 250 </li>
 251 <li class="toctree-l1"><a class="reference internal" href="memcached_quit.html">Disconnecting a client from a server</a><ul>
 252 <li class="toctree-l2"><a class="reference internal" href="memcached_quit.html#synopsis">SYNOPSIS</a></li>
 253 <li class="toctree-l2"><a class="reference internal" href="memcached_quit.html#description">DESCRIPTION</a></li>
 254 <li class="toctree-l2"><a class="reference internal" href="memcached_quit.html#return">RETURN</a></li>
 255 <li class="toctree-l2"><a class="reference internal" href="memcached_quit.html#see-also">SEE ALSO</a></li>
 256 </ul>
 257 </li>
 258 <li class="toctree-l1"><a class="reference internal" href="libmemcached/memcached_return_t.html">Error Codes (memcached_return_t)</a><ul>
 259 <li class="toctree-l2"><a class="reference internal" href="libmemcached/memcached_return_t.html#synopsis">SYNOPSIS</a></li>
 260 <li class="toctree-l2"><a class="reference internal" href="libmemcached/memcached_return_t.html#see-also">SEE ALSO</a></li>
 261 </ul>
 262 </li>
 263 <li class="toctree-l1"><a class="reference internal" href="memcached_sasl.html">SASL support</a><ul>
 264 <li class="toctree-l2"><a class="reference internal" href="memcached_sasl.html#synopsis">SYNOPSIS</a></li>
 265 <li class="toctree-l2"><a class="reference internal" href="memcached_sasl.html#description">DESCRIPTION</a></li>
 266 <li class="toctree-l2"><a class="reference internal" href="memcached_sasl.html#return">RETURN</a></li>
 267 <li class="toctree-l2"><a class="reference internal" href="memcached_sasl.html#see-also">SEE ALSO</a></li>
 268 </ul>
 269 </li>
 270 <li class="toctree-l1"><a class="reference internal" href="memcached_server_st.html">Managing lists of servers</a><ul>
 271 <li class="toctree-l2"><a class="reference internal" href="memcached_server_st.html#synopsis">SYNOPSIS</a></li>
 272 <li class="toctree-l2"><a class="reference internal" href="memcached_server_st.html#description">DESCRIPTION</a></li>
 273 <li class="toctree-l2"><a class="reference internal" href="memcached_server_st.html#return">RETURN</a></li>
 274 <li class="toctree-l2"><a class="reference internal" href="memcached_server_st.html#see-also">SEE ALSO</a></li>
 275 </ul>
 276 </li>
 277 <li class="toctree-l1"><a class="reference internal" href="memcached_servers.html">Manipulate the server information stored in memcached_st</a><ul>
 278 <li class="toctree-l2"><a class="reference internal" href="memcached_servers.html#synopsis">SYNOPSIS</a></li>
 279 <li class="toctree-l2"><a class="reference internal" href="memcached_servers.html#description">DESCRIPTION</a></li>
 280 <li class="toctree-l2"><a class="reference internal" href="memcached_servers.html#return">RETURN</a></li>
 281 <li class="toctree-l2"><a class="reference internal" href="memcached_servers.html#see-also">SEE ALSO</a></li>
 282 </ul>
 283 </li>
 284 <li class="toctree-l1"><a class="reference internal" href="memcached_strerror.html">Converting Errors, memcached_return_t, to strings</a><ul>
 285 <li class="toctree-l2"><a class="reference internal" href="memcached_strerror.html#synopsis">SYNOPSIS</a></li>
 286 <li class="toctree-l2"><a class="reference internal" href="memcached_strerror.html#description">DESCRIPTION</a></li>
 287 <li class="toctree-l2"><a class="reference internal" href="memcached_strerror.html#return">RETURN</a></li>
 288 <li class="toctree-l2"><a class="reference internal" href="memcached_strerror.html#see-also">SEE ALSO</a></li>
 289 </ul>
 290 </li>
 291 <li class="toctree-l1"><a class="reference internal" href="error_messages.html">Client Error messages</a><ul>
 292 <li class="toctree-l2"><a class="reference internal" href="client_errors/MEMCACHED_AUTH_CONTINUE.html">MEMCACHED_AUTH_CONTINUE</a></li>
 293 <li class="toctree-l2"><a class="reference internal" href="client_errors/MEMCACHED_AUTH_FAILURE.html">MEMCACHED_AUTH_FAILURE</a></li>
 294 <li class="toctree-l2"><a class="reference internal" href="client_errors/MEMCACHED_AUTH_PROBLEM.html">MEMCACHED_AUTH_PROBLEM</a></li>
 295 <li class="toctree-l2"><a class="reference internal" href="client_errors/MEMCACHED_BAD_KEY_PROVIDED.html">MEMCACHED_BAD_KEY_PROVIDED</a></li>
 296 <li class="toctree-l2"><a class="reference internal" href="client_errors/MEMCACHED_BUFFERED.html">MEMCACHED_BUFFERED</a></li>
 297 <li class="toctree-l2"><a class="reference internal" href="client_errors/MEMCACHED_CLIENT_ERROR.html">MEMCACHED_CLIENT_ERROR</a></li>
 298 <li class="toctree-l2"><a class="reference internal" href="client_errors/MEMCACHED_CONNECTION_BIND_FAILURE.html">MEMCACHED_CONNECTION_BIND_FAILURE</a></li>
 299 <li class="toctree-l2"><a class="reference internal" href="client_errors/MEMCACHED_CONNECTION_FAILURE.html">MEMCACHED_CONNECTION_FAILURE</a></li>
 300 <li class="toctree-l2"><a class="reference internal" href="client_errors/MEMCACHED_CONNECTION_SOCKET_CREATE_FAILURE.html">MEMCACHED_CONNECTION_SOCKET_CREATE_FAILURE</a></li>
 301 <li class="toctree-l2"><a class="reference internal" href="client_errors/MEMCACHED_DATA_DOES_NOT_EXIST.html">MEMCACHED_DATA_DOES_NOT_EXIST</a></li>
 302 <li class="toctree-l2"><a class="reference internal" href="client_errors/MEMCACHED_DATA_EXISTS.html">MEMCACHED_DATA_EXISTS</a></li>
 303 <li class="toctree-l2"><a class="reference internal" href="client_errors/MEMCACHED_DELETED.html">MEMCACHED_DELETED</a></li>
 304 <li class="toctree-l2"><a class="reference internal" href="client_errors/MEMCACHED_DEPRECATED.html">MEMCACHED_DEPRECATED</a></li>
 305 <li class="toctree-l2"><a class="reference internal" href="client_errors/MEMCACHED_E2BIG.html">MEMCACHED_E2BIG</a></li>
 306 <li class="toctree-l2"><a class="reference internal" href="client_errors/MEMCACHED_END.html">MEMCACHED_END</a></li>
 307 <li class="toctree-l2"><a class="reference internal" href="client_errors/MEMCACHED_ERRNO.html">MEMCACHED_ERRNO</a></li>
 308 <li class="toctree-l2"><a class="reference internal" href="client_errors/MEMCACHED_FAILURE.html">MEMCACHED_FAILURE</a></li>
 309 <li class="toctree-l2"><a class="reference internal" href="client_errors/MEMCACHED_FAIL_UNIX_SOCKET.html">MEMCACHED_FAIL_UNIX_SOCKET</a></li>
 310 <li class="toctree-l2"><a class="reference internal" href="client_errors/MEMCACHED_FETCH_NOTFINISHED.html">MEMCACHED_FETCH_NOTFINISHED</a></li>
 311 <li class="toctree-l2"><a class="reference internal" href="client_errors/MEMCACHED_HOST_LOOKUP_FAILURE.html">MEMCACHED_HOST_LOOKUP_FAILURE</a></li>
 312 <li class="toctree-l2"><a class="reference internal" href="client_errors/MEMCACHED_INVALID_ARGUMENTS.html">MEMCACHED_INVALID_ARGUMENTS</a></li>
 313 <li class="toctree-l2"><a class="reference internal" href="client_errors/MEMCACHED_INVALID_HOST_PROTOCOL.html">MEMCACHED_INVALID_HOST_PROTOCOL</a></li>
 314 <li class="toctree-l2"><a class="reference internal" href="client_errors/MEMCACHED_ITEM.html">MEMCACHED_ITEM</a></li>
 315 <li class="toctree-l2"><a class="reference internal" href="client_errors/MEMCACHED_KEY_TOO_BIG.html">MEMCACHED_KEY_TOO_BIG</a></li>
 316 <li class="toctree-l2"><a class="reference internal" href="client_errors/MEMCACHED_MAXIMUM_RETURN.html">MEMCACHED_MAXIMUM_RETURN</a></li>
 317 <li class="toctree-l2"><a class="reference internal" href="client_errors/MEMCACHED_MEMORY_ALLOCATION_FAILURE.html">MEMCACHED_MEMORY_ALLOCATION_FAILURE</a></li>
 318 <li class="toctree-l2"><a class="reference internal" href="client_errors/MEMCACHED_NOTFOUND.html">MEMCACHED_NOTFOUND</a></li>
 319 <li class="toctree-l2"><a class="reference internal" href="client_errors/MEMCACHED_NOTSTORED.html">MEMCACHED_NOTSTORED</a></li>
 320 <li class="toctree-l2"><a class="reference internal" href="client_errors/MEMCACHED_NOT_SUPPORTED.html">MEMCACHED_NOT_SUPPORTED</a></li>
 321 <li class="toctree-l2"><a class="reference internal" href="client_errors/MEMCACHED_NO_KEY_PROVIDED.html">MEMCACHED_NO_KEY_PROVIDED</a></li>
 322 <li class="toctree-l2"><a class="reference internal" href="client_errors/MEMCACHED_NO_SERVERS.html">MEMCACHED_NO_SERVERS</a></li>
 323 <li class="toctree-l2"><a class="reference internal" href="client_errors/MEMCACHED_PARSE_ERROR.html">MEMCACHED_PARSE_ERROR</a></li>
 324 <li class="toctree-l2"><a class="reference internal" href="client_errors/MEMCACHED_PARSE_USER_ERROR.html">MEMCACHED_PARSE_USER_ERROR</a></li>
 325 <li class="toctree-l2"><a class="reference internal" href="client_errors/MEMCACHED_PARTIAL_READ.html">MEMCACHED_PARTIAL_READ</a></li>
 326 <li class="toctree-l2"><a class="reference internal" href="client_errors/MEMCACHED_PROTOCOL_ERROR.html">MEMCACHED_PROTOCOL_ERROR</a></li>
 327 <li class="toctree-l2"><a class="reference internal" href="client_errors/MEMCACHED_READ_FAILURE.html">MEMCACHED_READ_FAILURE</a></li>
 328 <li class="toctree-l2"><a class="reference internal" href="client_errors/MEMCACHED_SERVER_ERROR.html">MEMCACHED_SERVER_ERROR</a></li>
 329 <li class="toctree-l2"><a class="reference internal" href="client_errors/MEMCACHED_SERVER_MARKED_DEAD.html">MEMCACHED_SERVER_MARKED_DEAD</a></li>
 330 <li class="toctree-l2"><a class="reference internal" href="client_errors/MEMCACHED_SOME_ERRORS.html">MEMCACHED_SOME_ERRORS</a></li>
 331 <li class="toctree-l2"><a class="reference internal" href="client_errors/MEMCACHED_STAT.html">MEMCACHED_STAT</a></li>
 332 <li class="toctree-l2"><a class="reference internal" href="client_errors/MEMCACHED_STORED.html">MEMCACHED_STORED</a></li>
 333 <li class="toctree-l2"><a class="reference internal" href="client_errors/MEMCACHED_SUCCESS.html">MEMCACHED_SUCCESS</a></li>
 334 <li class="toctree-l2"><a class="reference internal" href="client_errors/MEMCACHED_TIMEOUT.html">MEMCACHED_TIMEOUT</a></li>
 335 <li class="toctree-l2"><a class="reference internal" href="client_errors/MEMCACHED_UNKNOWN_READ_FAILURE.html">MEMCACHED_UNKNOWN_READ_FAILURE</a></li>
 336 <li class="toctree-l2"><a class="reference internal" href="client_errors/MEMCACHED_UNKNOWN_STAT_KEY.html">MEMCACHED_UNKNOWN_STAT_KEY</a></li>
 337 <li class="toctree-l2"><a class="reference internal" href="client_errors/MEMCACHED_VALUE.html">MEMCACHED_VALUE</a></li>
 338 <li class="toctree-l2"><a class="reference internal" href="client_errors/MEMCACHED_WRITE_FAILURE.html">MEMCACHED_WRITE_FAILURE</a></li>
 339 </ul>
 340 </li>
 341 <li class="toctree-l1"><a class="reference internal" href="memcached_user_data.html">Storing custom user information in the client.</a><ul>
 342 <li class="toctree-l2"><a class="reference internal" href="memcached_user_data.html#library">LIBRARY</a></li>
 343 <li class="toctree-l2"><a class="reference internal" href="memcached_user_data.html#synopsis">SYNOPSIS</a></li>
 344 <li class="toctree-l2"><a class="reference internal" href="memcached_user_data.html#description">DESCRIPTION</a></li>
 345 <li class="toctree-l2"><a class="reference internal" href="memcached_user_data.html#return">RETURN</a></li>
 346 <li class="toctree-l2"><a class="reference internal" href="memcached_user_data.html#see-also">SEE ALSO</a></li>
 347 </ul>
 348 </li>
 349 <li class="toctree-l1"><a class="reference internal" href="memcached_verbosity.html">Setting the verbosity of a server</a><ul>
 350 <li class="toctree-l2"><a class="reference internal" href="memcached_verbosity.html#synopsis">SYNOPSIS</a></li>
 351 <li class="toctree-l2"><a class="reference internal" href="memcached_verbosity.html#description">DESCRIPTION</a></li>
 352 <li class="toctree-l2"><a class="reference internal" href="memcached_verbosity.html#return">RETURN</a></li>
 353 <li class="toctree-l2"><a class="reference internal" href="memcached_verbosity.html#see-also">SEE ALSO</a></li>
 354 </ul>
 355 </li>
 356 <li class="toctree-l1"><a class="reference internal" href="memcached_version.html">Getting version information about the client and server</a><ul>
 357 <li class="toctree-l2"><a class="reference internal" href="memcached_version.html#synopsis">SYNOPSIS</a></li>
 358 <li class="toctree-l2"><a class="reference internal" href="memcached_version.html#description">DESCRIPTION</a></li>
 359 <li class="toctree-l2"><a class="reference internal" href="memcached_version.html#return">RETURN</a></li>
 360 <li class="toctree-l2"><a class="reference internal" href="memcached_version.html#see-also">SEE ALSO</a></li>
 361 </ul>
 362 </li>
 363 <li class="toctree-l1"><a class="reference internal" href="libmemcached/defaults.html">DEFAULTS</a></li>
 364 </ul>
 365 <p class="caption"><span class="caption-text">Interface Versions</span></p>
 366 <ul>
 367 <li class="toctree-l1"><a class="reference internal" href="libmemcached-1.0/index.html">libmemcached 1.0 API</a><ul>
 368 <li class="toctree-l2"><a class="reference internal" href="libmemcached-1.0/memcached_touch.html">memcached_touch, memcached_touch_by_key</a></li>
 369 </ul>
 370 </li>
 371 <li class="toctree-l1"><a class="reference internal" href="libmemcached-1.1/index.html">libmemcached 1.1 API</a></li>
 372 </ul>
 373 <p class="caption"><span class="caption-text">Deprecated Functions</span></p>
 374 <ul>
 375 <li class="toctree-l1"><a class="reference internal" href="libmemcached/memcached_fetch.html">memcached_fetch</a></li>
 376 </ul>
 377 <p class="caption"><span class="caption-text">Platform Specifics</span></p>
 378 <ul>
 379 <li class="toctree-l1"><a class="reference internal" href="tap.html">Systemtap support</a></li>
 380 <li class="toctree-l1"><a class="reference internal" href="types.html">Required C types</a><ul>
 381 <li class="toctree-l2"><a class="reference internal" href="types.html#types">Types</a></li>
 382 <li class="toctree-l2"><a class="reference internal" href="types.html#c-types-used">C Types Used</a></li>
 383 </ul>
 384 </li>
 385 </ul>
 386 <p class="caption"><span class="caption-text">Deriving Statistics from a Server</span></p>
 387 <ul>
 388 <li class="toctree-l1"><a class="reference internal" href="memcached_analyze.html">Analyzing servers</a><ul>
 389 <li class="toctree-l2"><a class="reference internal" href="memcached_analyze.html#synopsis">SYNOPSIS</a></li>
 390 <li class="toctree-l2"><a class="reference internal" href="memcached_analyze.html#description">DESCRIPTION</a></li>
 391 <li class="toctree-l2"><a class="reference internal" href="memcached_analyze.html#return">RETURN</a></li>
 392 <li class="toctree-l2"><a class="reference internal" href="memcached_analyze.html#see-also">SEE ALSO</a></li>
 393 </ul>
 394 </li>
 395 <li class="toctree-l1"><a class="reference internal" href="memcached_stats.html">Working with statistical information from a server</a><ul>
 396 <li class="toctree-l2"><a class="reference internal" href="memcached_stats.html#synopsis">SYNOPSIS</a></li>
 397 <li class="toctree-l2"><a class="reference internal" href="memcached_stats.html#description">DESCRIPTION</a></li>
 398 <li class="toctree-l2"><a class="reference internal" href="memcached_stats.html#return">RETURN</a></li>
 399 <li class="toctree-l2"><a class="reference internal" href="memcached_stats.html#see-also">SEE ALSO</a></li>
 400 </ul>
 401 </li>
 402 </ul>
 403 <p class="caption"><span class="caption-text">Libmemcachedutil</span></p>
 404 <ul>
 405 <li class="toctree-l1"><a class="reference internal" href="libmemcachedutil.html">Introducing libmemcachedutil</a><ul>
 406 <li class="toctree-l2"><a class="reference internal" href="libmemcachedutil.html#synopsis">SYNOPSIS</a></li>
 407 <li class="toctree-l2"><a class="reference internal" href="libmemcachedutil.html#description">DESCRIPTION</a></li>
 408 <li class="toctree-l2"><a class="reference internal" href="libmemcachedutil.html#threads">THREADS</a></li>
 409 <li class="toctree-l2"><a class="reference internal" href="libmemcachedutil.html#see-also">SEE ALSO</a></li>
 410 </ul>
 411 </li>
 412 <li class="toctree-l1"><a class="reference internal" href="memcached_pool.html">Working with memcached pools</a><ul>
 413 <li class="toctree-l2"><a class="reference internal" href="memcached_pool.html#synopsis">SYNOPSIS</a></li>
 414 <li class="toctree-l2"><a class="reference internal" href="memcached_pool.html#description">DESCRIPTION</a></li>
 415 <li class="toctree-l2"><a class="reference internal" href="memcached_pool.html#return">RETURN</a></li>
 416 <li class="toctree-l2"><a class="reference internal" href="memcached_pool.html#see-also">SEE ALSO</a></li>
 417 </ul>
 418 </li>
 419 </ul>
 420 <p class="caption"><span class="caption-text">Client Applications</span></p>
 421 <ul>
 422 <li class="toctree-l1"><a class="reference internal" href="bin/memcapable.html">memcapable - Checking a Memcached server capabilities and compatibility</a><ul>
 423 <li class="toctree-l2"><a class="reference internal" href="bin/memcapable.html#synopsis">SYNOPSIS</a></li>
 424 <li class="toctree-l2"><a class="reference internal" href="bin/memcapable.html#description">DESCRIPTION</a></li>
 425 <li class="toctree-l2"><a class="reference internal" href="bin/memcapable.html#limitations">LIMITATIONS</a></li>
 426 <li class="toctree-l2"><a class="reference internal" href="bin/memcapable.html#options">OPTIONS</a></li>
 427 <li class="toctree-l2"><a class="reference internal" href="bin/memcapable.html#see-also">SEE ALSO</a></li>
 428 </ul>
 429 </li>
 430 <li class="toctree-l1"><a class="reference internal" href="bin/memcat.html">memcat - “cat” data from a server</a><ul>
 431 <li class="toctree-l2"><a class="reference internal" href="bin/memcat.html#synopsis">SYNOPSIS</a></li>
 432 <li class="toctree-l2"><a class="reference internal" href="bin/memcat.html#description">DESCRIPTION</a></li>
 433 <li class="toctree-l2"><a class="reference internal" href="bin/memcat.html#options">OPTIONS</a></li>
 434 <li class="toctree-l2"><a class="reference internal" href="bin/memcat.html#see-also">SEE ALSO</a></li>
 435 </ul>
 436 </li>
 437 <li class="toctree-l1"><a class="reference internal" href="bin/memcp.html">memcp - Copy data to a server</a><ul>
 438 <li class="toctree-l2"><a class="reference internal" href="bin/memcp.html#synopsis">SYNOPSIS</a></li>
 439 <li class="toctree-l2"><a class="reference internal" href="bin/memcp.html#description">DESCRIPTION</a></li>
 440 <li class="toctree-l2"><a class="reference internal" href="bin/memcp.html#options">OPTIONS</a></li>
 441 <li class="toctree-l2"><a class="reference internal" href="bin/memcp.html#see-also">SEE ALSO</a></li>
 442 </ul>
 443 </li>
 444 <li class="toctree-l1"><a class="reference internal" href="bin/memdump.html">memdump - Dumping your server</a><ul>
 445 <li class="toctree-l2"><a class="reference internal" href="bin/memdump.html#synopsis">SYNOPSIS</a></li>
 446 <li class="toctree-l2"><a class="reference internal" href="bin/memdump.html#description">DESCRIPTION</a></li>
 447 <li class="toctree-l2"><a class="reference internal" href="bin/memdump.html#options">OPTIONS</a></li>
 448 <li class="toctree-l2"><a class="reference internal" href="bin/memdump.html#see-also">SEE ALSO</a></li>
 449 </ul>
 450 </li>
 451 <li class="toctree-l1"><a class="reference internal" href="bin/memerror.html">memerror - translate an error code to a string</a><ul>
 452 <li class="toctree-l2"><a class="reference internal" href="bin/memerror.html#synopsis">SYNOPSIS</a></li>
 453 <li class="toctree-l2"><a class="reference internal" href="bin/memerror.html#description">DESCRIPTION</a></li>
 454 <li class="toctree-l2"><a class="reference internal" href="bin/memerror.html#options">OPTIONS</a></li>
 455 <li class="toctree-l2"><a class="reference internal" href="bin/memerror.html#see-also">SEE ALSO</a></li>
 456 </ul>
 457 </li>
 458 <li class="toctree-l1"><a class="reference internal" href="bin/memflush.html">memflush - flush all data from a server</a><ul>
 459 <li class="toctree-l2"><a class="reference internal" href="bin/memflush.html#synopsis">SYNOPSIS</a></li>
 460 <li class="toctree-l2"><a class="reference internal" href="bin/memflush.html#description">DESCRIPTION</a></li>
 461 <li class="toctree-l2"><a class="reference internal" href="bin/memflush.html#options">OPTIONS</a></li>
 462 <li class="toctree-l2"><a class="reference internal" href="bin/memflush.html#see-also">SEE ALSO</a></li>
 463 </ul>
 464 </li>
 465 <li class="toctree-l1"><a class="reference internal" href="bin/memrm.html">memrm - Remove data from a server</a><ul>
 466 <li class="toctree-l2"><a class="reference internal" href="bin/memrm.html#synopsis">SYNOPSIS</a></li>
 467 <li class="toctree-l2"><a class="reference internal" href="bin/memrm.html#description">DESCRIPTION</a></li>
 468 <li class="toctree-l2"><a class="reference internal" href="bin/memrm.html#options">OPTIONS</a></li>
 469 <li class="toctree-l2"><a class="reference internal" href="bin/memrm.html#see-also">SEE ALSO</a></li>
 470 </ul>
 471 </li>
 472 <li class="toctree-l1"><a class="reference internal" href="bin/memslap.html">memslap - Load testing  and benchmarking a server</a><ul>
 473 <li class="toctree-l2"><a class="reference internal" href="bin/memslap.html#synopsis">SYNOPSIS</a></li>
 474 <li class="toctree-l2"><a class="reference internal" href="bin/memslap.html#description">DESCRIPTION</a></li>
 475 <li class="toctree-l2"><a class="reference internal" href="bin/memslap.html#options">OPTIONS</a></li>
 476 <li class="toctree-l2"><a class="reference internal" href="bin/memslap.html#see-also">SEE ALSO</a></li>
 477 </ul>
 478 </li>
 479 <li class="toctree-l1"><a class="reference internal" href="bin/memaslap.html">memaslap - Load testing  and benchmarking a server</a><ul>
 480 <li class="toctree-l2"><a class="reference internal" href="bin/memaslap.html#synopsis">SYNOPSIS</a></li>
 481 <li class="toctree-l2"><a class="reference internal" href="bin/memaslap.html#description">DESCRIPTION</a></li>
 482 <li class="toctree-l2"><a class="reference internal" href="bin/memaslap.html#features">FEATURES</a></li>
 483 <li class="toctree-l2"><a class="reference internal" href="bin/memaslap.html#details">DETAILS</a></li>
 484 <li class="toctree-l2"><a class="reference internal" href="bin/memaslap.html#usage">USAGE</a></li>
 485 <li class="toctree-l2"><a class="reference internal" href="bin/memaslap.html#configuration-file">Configuration file</a></li>
 486 <li class="toctree-l2"><a class="reference internal" href="bin/memaslap.html#format-of-output">Format of output</a></li>
 487 <li class="toctree-l2"><a class="reference internal" href="bin/memaslap.html#options">OPTIONS</a></li>
 488 <li class="toctree-l2"><a class="reference internal" href="bin/memaslap.html#examples">EXAMPLES</a></li>
 489 <li class="toctree-l2"><a class="reference internal" href="bin/memaslap.html#see-also">SEE ALSO</a></li>
 490 </ul>
 491 </li>
 492 <li class="toctree-l1"><a class="reference internal" href="bin/memstat.html">memstat - Gather statistics from a server</a><ul>
 493 <li class="toctree-l2"><a class="reference internal" href="bin/memstat.html#synopsis">SYNOPSIS</a></li>
 494 <li class="toctree-l2"><a class="reference internal" href="bin/memstat.html#description">DESCRIPTION</a></li>
 495 <li class="toctree-l2"><a class="reference internal" href="bin/memstat.html#options">OPTIONS</a></li>
 496 <li class="toctree-l2"><a class="reference internal" href="bin/memstat.html#see-also">SEE ALSO</a></li>
 497 </ul>
 498 </li>
 499 <li class="toctree-l1"><a class="reference internal" href="bin/memexist.html">memexist - Check for the existence of a key</a><ul>
 500 <li class="toctree-l2"><a class="reference internal" href="bin/memexist.html#synopsis">SYNOPSIS</a></li>
 501 <li class="toctree-l2"><a class="reference internal" href="bin/memexist.html#description">DESCRIPTION</a></li>
 502 <li class="toctree-l2"><a class="reference internal" href="bin/memexist.html#options">OPTIONS</a></li>
 503 <li class="toctree-l2"><a class="reference internal" href="bin/memexist.html#see-also">SEE ALSO</a></li>
 504 </ul>
 505 </li>
 506 <li class="toctree-l1"><a class="reference internal" href="bin/memparse.html">memparse - Parse an option string</a><ul>
 507 <li class="toctree-l2"><a class="reference internal" href="bin/memparse.html#synopsis">SYNOPSIS</a></li>
 508 <li class="toctree-l2"><a class="reference internal" href="bin/memparse.html#description">DESCRIPTION</a></li>
 509 <li class="toctree-l2"><a class="reference internal" href="bin/memparse.html#options">OPTIONS</a></li>
 510 <li class="toctree-l2"><a class="reference internal" href="bin/memparse.html#see-also">SEE ALSO</a></li>
 511 </ul>
 512 </li>
 513 <li class="toctree-l1"><a class="reference internal" href="bin/memping.html">memping - Test to see if a server is available.</a><ul>
 514 <li class="toctree-l2"><a class="reference internal" href="bin/memping.html#synopsis">SYNOPSIS</a></li>
 515 <li class="toctree-l2"><a class="reference internal" href="bin/memping.html#description">DESCRIPTION</a></li>
 516 <li class="toctree-l2"><a class="reference internal" href="bin/memping.html#options">OPTIONS</a></li>
 517 <li class="toctree-l2"><a class="reference internal" href="bin/memping.html#see-also">SEE ALSO</a></li>
 518 </ul>
 519 </li>
 520 <li class="toctree-l1"><a class="reference internal" href="bin/memtouch.html">memtouch - Touches a key.</a><ul>
 521 <li class="toctree-l2"><a class="reference internal" href="bin/memtouch.html#synopsis">SYNOPSIS</a></li>
 522 <li class="toctree-l2"><a class="reference internal" href="bin/memtouch.html#description">DESCRIPTION</a></li>
 523 <li class="toctree-l2"><a class="reference internal" href="bin/memtouch.html#options">OPTIONS</a></li>
 524 <li class="toctree-l2"><a class="reference internal" href="bin/memtouch.html#see-also">SEE ALSO</a></li>
 525 </ul>
 526 </li>
 527 </ul>
 528 <p class="caption"><span class="caption-text">Libhashkit</span></p>
 529 <ul>
 530 <li class="toctree-l1"><a class="reference internal" href="libhashkit.html">Introducing libhashkit</a><ul>
 531 <li class="toctree-l2"><a class="reference internal" href="libhashkit.html#description">DESCRIPTION</a></li>
 532 <li class="toctree-l2"><a class="reference internal" href="libhashkit.html#see-also">SEE ALSO</a></li>
 533 </ul>
 534 </li>
 535 <li class="toctree-l1"><a class="reference internal" href="hashkit_create.html">Creating a hashkit structure</a><ul>
 536 <li class="toctree-l2"><a class="reference internal" href="hashkit_create.html#synopsis">SYNOPSIS</a></li>
 537 <li class="toctree-l2"><a class="reference internal" href="hashkit_create.html#description">DESCRIPTION</a></li>
 538 <li class="toctree-l2"><a class="reference internal" href="hashkit_create.html#return-value">RETURN VALUE</a></li>
 539 <li class="toctree-l2"><a class="reference internal" href="hashkit_create.html#see-also">SEE ALSO</a></li>
 540 </ul>
 541 </li>
 542 <li class="toctree-l1"><a class="reference internal" href="hashkit_functions.html">Available Hashes</a><ul>
 543 <li class="toctree-l2"><a class="reference internal" href="hashkit_functions.html#synopsis">SYNOPSIS</a></li>
 544 <li class="toctree-l2"><a class="reference internal" href="hashkit_functions.html#description">DESCRIPTION</a></li>
 545 <li class="toctree-l2"><a class="reference internal" href="hashkit_functions.html#return-value">RETURN VALUE</a></li>
 546 <li class="toctree-l2"><a class="reference internal" href="hashkit_functions.html#see-also">SEE ALSO</a></li>
 547 </ul>
 548 </li>
 549 <li class="toctree-l1"><a class="reference internal" href="hashkit_value.html">hashkit_value</a><ul>
 550 <li class="toctree-l2"><a class="reference internal" href="hashkit_value.html#synopsis">SYNOPSIS</a></li>
 551 <li class="toctree-l2"><a class="reference internal" href="hashkit_value.html#description">DESCRIPTION</a></li>
 552 <li class="toctree-l2"><a class="reference internal" href="hashkit_value.html#return-value">RETURN VALUE</a></li>
 553 <li class="toctree-l2"><a class="reference internal" href="hashkit_value.html#see-also">SEE ALSO</a></li>
 554 </ul>
 555 </li>
 556 </ul>
 557
 558
 559
 560         </div>
 561       </div>
 562     </nav>
 563
 564     <section data-toggle="wy-nav-shift" class="wy-nav-content-wrap">
 565
 566
 567       <nav class="wy-nav-top" aria-label="top navigation">
 568
 569           <i data-toggle="wy-nav-top" class="fa fa-bars"></i>
 570           <a href="index.html">libmemcached</a>
 571
 572       </nav>
 573
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 601       <li>Store, replace, add, or atomically add data to the server</li>
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 618   <div class="section" id="store-replace-add-or-atomically-add-data-to-the-server">
 619 <h1>Store, replace, add, or atomically add data to the server<a class="headerlink" href="#store-replace-add-or-atomically-add-data-to-the-server" title="Permalink to this headline">¶</a></h1>
 620 <div class="section" id="synopsis">
 621 <span id="index-0"></span><h2>SYNOPSIS<a class="headerlink" href="#synopsis" title="Permalink to this headline">¶</a></h2>
 622 <p>#include &lt;libmemcached/memcached.h&gt;</p>
 623 <dl class="function">
 624 <dt id="c.memcached_set">
 625 <a class="reference internal" href="libmemcached/memcached_return_t.html#c.memcached_return_t" title="memcached_return_t">memcached_return_t</a> <code class="sig-name descname">memcached_set</code><span class="sig-paren">(</span><a class="reference internal" href="memcached_create.html#c.memcached_st" title="memcached_st">memcached_st</a><em> *ptr</em>, const char<em> *key</em>, size_t<em> key_length</em>, const char<em> *value</em>, size_t<em> value_length</em>, time_t<em> expiration</em>, <a class="reference internal" href="types.html#c.uint32_t" title="uint32_t">uint32_t</a><em> flags</em><span class="sig-paren">)</span><a class="headerlink" href="#c.memcached_set" title="Permalink to this definition">¶</a></dt>
 626 <dd></dd></dl>
 627
 628 <dl class="function">
 629 <dt id="c.memcached_add">
 630 <a class="reference internal" href="libmemcached/memcached_return_t.html#c.memcached_return_t" title="memcached_return_t">memcached_return_t</a> <code class="sig-name descname">memcached_add</code><span class="sig-paren">(</span><a class="reference internal" href="memcached_create.html#c.memcached_st" title="memcached_st">memcached_st</a><em> *ptr</em>, const char<em> *key</em>, size_t<em> key_length</em>, const char<em> *value</em>, size_t<em> value_length</em>, time_t<em> expiration</em>, <a class="reference internal" href="types.html#c.uint32_t" title="uint32_t">uint32_t</a><em> flags</em><span class="sig-paren">)</span><a class="headerlink" href="#c.memcached_add" title="Permalink to this definition">¶</a></dt>
 631 <dd></dd></dl>
 632
 633 <dl class="function">
 634 <dt id="c.memcached_replace">
 635 <a class="reference internal" href="libmemcached/memcached_return_t.html#c.memcached_return_t" title="memcached_return_t">memcached_return_t</a> <code class="sig-name descname">memcached_replace</code><span class="sig-paren">(</span><a class="reference internal" href="memcached_create.html#c.memcached_st" title="memcached_st">memcached_st</a><em> *ptr</em>, const char<em> *key</em>, size_t<em> key_length</em>, const char<em> *value</em>, size_t<em> value_length</em>, time_t<em> expiration</em>, <a class="reference internal" href="types.html#c.uint32_t" title="uint32_t">uint32_t</a><em> flags</em><span class="sig-paren">)</span><a class="headerlink" href="#c.memcached_replace" title="Permalink to this definition">¶</a></dt>
 636 <dd></dd></dl>
 637
 638 <dl class="function">
 639 <dt id="c.memcached_set_by_key">
 640 <a class="reference internal" href="libmemcached/memcached_return_t.html#c.memcached_return_t" title="memcached_return_t">memcached_return_t</a> <code class="sig-name descname">memcached_set_by_key</code><span class="sig-paren">(</span><a class="reference internal" href="memcached_create.html#c.memcached_st" title="memcached_st">memcached_st</a><em> *ptr</em>, const char<em> *group_key</em>, size_t<em> group_key_length</em>, const char<em> *key</em>, size_t<em> key_length</em>, const char<em> *value</em>, size_t<em> value_length</em>, time_t<em> expiration</em>, <a class="reference internal" href="types.html#c.uint32_t" title="uint32_t">uint32_t</a><em> flags</em><span class="sig-paren">)</span><a class="headerlink" href="#c.memcached_set_by_key" title="Permalink to this definition">¶</a></dt>
 641 <dd></dd></dl>
 642
 643 <dl class="function">
 644 <dt id="c.memcached_add_by_key">
 645 <a class="reference internal" href="libmemcached/memcached_return_t.html#c.memcached_return_t" title="memcached_return_t">memcached_return_t</a> <code class="sig-name descname">memcached_add_by_key</code><span class="sig-paren">(</span><a class="reference internal" href="memcached_create.html#c.memcached_st" title="memcached_st">memcached_st</a><em> *ptr</em>, const char<em> *group_key</em>, size_t<em> group_key_length</em>, const char<em> *key</em>, size_t<em> key_length</em>, const char<em> *value</em>, size_t<em> value_length</em>, time_t<em> expiration</em>, <a class="reference internal" href="types.html#c.uint32_t" title="uint32_t">uint32_t</a><em> flags</em><span class="sig-paren">)</span><a class="headerlink" href="#c.memcached_add_by_key" title="Permalink to this definition">¶</a></dt>
 646 <dd></dd></dl>
 647
 648 <dl class="function">
 649 <dt id="c.memcached_replace_by_key">
 650 <a class="reference internal" href="libmemcached/memcached_return_t.html#c.memcached_return_t" title="memcached_return_t">memcached_return_t</a> <code class="sig-name descname">memcached_replace_by_key</code><span class="sig-paren">(</span><a class="reference internal" href="memcached_create.html#c.memcached_st" title="memcached_st">memcached_st</a><em> *ptr</em>, const char<em> *group_key</em>, size_t<em> group_key_length</em>, const char<em> *key</em>, size_t<em> key_length</em>, const char<em> *value</em>, size_t<em> value_length</em>, time_t<em> expiration</em>, <a class="reference internal" href="types.html#c.uint32_t" title="uint32_t">uint32_t</a><em> flags</em><span class="sig-paren">)</span><a class="headerlink" href="#c.memcached_replace_by_key" title="Permalink to this definition">¶</a></dt>
 651 <dd></dd></dl>
 652
 653 <p>Compile and link with -lmemcached</p>
 654 </div>
 655 <div class="section" id="description">
 656 <h2>DESCRIPTION<a class="headerlink" href="#description" title="Permalink to this headline">¶</a></h2>
 657 <p><a class="reference internal" href="#c.memcached_set" title="memcached_set"><code class="xref c c-func docutils literal notranslate"><span class="pre">memcached_set()</span></code></a>, <a class="reference internal" href="#c.memcached_add" title="memcached_add"><code class="xref c c-func docutils literal notranslate"><span class="pre">memcached_add()</span></code></a>, and <a class="reference internal" href="#c.memcached_replace" title="memcached_replace"><code class="xref c c-func docutils literal notranslate"><span class="pre">memcached_replace()</span></code></a> are all used to store information on the server. All methods take a key, and its length to store the object. Keys are currently limited to 250 characters when using either a version of memcached(1) which is 1.4 or below, or when using the text protocol. You must supply both a value and a length. Optionally you
 658 store the object. Keys are currently limited to 250 characters by the
 659 memcached(1) server. You must supply both a value and a length. Optionally you
 660 may test an expiration time for the object and a 16 byte value (it is meant to be used as a bitmap). “flags” is a 4byte space that is stored alongside of the main value. Many sub libraries make use of this field, so in most cases users should avoid making use of it.</p>
 661 <p><a class="reference internal" href="#c.memcached_set" title="memcached_set"><code class="xref c c-func docutils literal notranslate"><span class="pre">memcached_set()</span></code></a> will write an object to the server. If an object
 662 already exists it will overwrite what is in the server. If the object does not
 663 exist it will be written. If you are using the non-blocking mode this function
 664 will always return true unless a network error occurs.</p>
 665 <p><a class="reference internal" href="#c.memcached_replace" title="memcached_replace"><code class="xref c c-func docutils literal notranslate"><span class="pre">memcached_replace()</span></code></a> replaces an object on the server. If the object is not found on the server an error occurs.</p>
 666 <p><a class="reference internal" href="#c.memcached_add" title="memcached_add"><code class="xref c c-func docutils literal notranslate"><span class="pre">memcached_add()</span></code></a> adds an object to the server. If the object is found on the server an error occurs, otherwise the value is stored.</p>
 667 <p><a class="reference internal" href="memcached_cas.html#c.memcached_cas" title="memcached_cas"><code class="xref c c-func docutils literal notranslate"><span class="pre">memcached_cas()</span></code></a> overwrites data in the server as long as the “cas”
 668 value is still the same in the server. You can get the cas value of a result by
 669 calling <a class="reference internal" href="memcached_result_st.html#c.memcached_result_cas" title="memcached_result_cas"><code class="xref c c-func docutils literal notranslate"><span class="pre">memcached_result_cas()</span></code></a> on a memcached_result_st(3) structure. At the point
 670 that this note was written cas is still buggy in memcached. Turning on tests
 671 for it in libmemcached(3) is optional. Please see memcached_set for
 672 information on how to do this.</p>
 673 <p><a class="reference internal" href="#c.memcached_set_by_key" title="memcached_set_by_key"><code class="xref c c-func docutils literal notranslate"><span class="pre">memcached_set_by_key()</span></code></a>, <a class="reference internal" href="#c.memcached_add_by_key" title="memcached_add_by_key"><code class="xref c c-func docutils literal notranslate"><span class="pre">memcached_add_by_key()</span></code></a>, and <a class="reference internal" href="#c.memcached_replace_by_key" title="memcached_replace_by_key"><code class="xref c c-func docutils literal notranslate"><span class="pre">memcached_replace_by_key()</span></code></a> methods all behave in a similar method as the non
 674 key methods. The difference is that they use their group_key parameter to map
 675 objects to particular servers.</p>
 676 <p>If you are looking for performance, <a class="reference internal" href="#c.memcached_set" title="memcached_set"><code class="xref c c-func docutils literal notranslate"><span class="pre">memcached_set()</span></code></a> with non-blocking IO is the fastest way to store data on the server.</p>
 677 <p>All of the above functions are tested with the <a class="reference internal" href="memcached_behavior.html#c.MEMCACHED_BEHAVIOR_USE_UDP" title="MEMCACHED_BEHAVIOR_USE_UDP"><code class="xref c c-type docutils literal notranslate"><span class="pre">MEMCACHED_BEHAVIOR_USE_UDP</span></code></a> behavior enabled. However, when using these operations with this behavior
 678 on, there are limits to the size of the payload being sent to the server.
 679 The reason for these limits is that the Memcached Server does not allow
 680 multi-datagram requests and the current server implementation sets a datagram
 681 size to 1400 bytes. Due to protocol overhead, the actual limit of the user supplied data is less than 1400 bytes and depends on the protocol in use as, well as the operation being
 682 executed. When running with the binary protocol, <a class="reference internal" href="memcached_behavior.html#c.MEMCACHED_BEHAVIOR_BINARY_PROTOCOL" title="MEMCACHED_BEHAVIOR_BINARY_PROTOCOL"><code class="xref c c-type docutils literal notranslate"><span class="pre">MEMCACHED_BEHAVIOR_BINARY_PROTOCOL</span></code></a>, the size of the key,value, flags and expiry combined may not
 683 exceed 1368 bytes. When running with the ASCII protocol, the exact limit fluctuates depending on which function is being executed and whether the function is a cas operation or not. For non-cas ASCII set operations, there are at least
 684 1335 bytes available to split among the key, key_prefix, and value; for cas
 685 ASCII operations there are at least 1318 bytes available to split among the key, key_prefix and value. If the total size of the command, including overhead,
 686 exceeds 1400 bytes, a <a class="reference internal" href="client_errors/MEMCACHED_WRITE_FAILURE.html#c.MEMCACHED_WRITE_FAILURE" title="MEMCACHED_WRITE_FAILURE"><code class="xref c c-type docutils literal notranslate"><span class="pre">MEMCACHED_WRITE_FAILURE</span></code></a> will be returned.</p>
 687 </div>
 688 <div class="section" id="return">
 689 <h2>RETURN<a class="headerlink" href="#return" title="Permalink to this headline">¶</a></h2>
 690 <p>All methods return a value of type <a class="reference internal" href="libmemcached/memcached_return_t.html#c.memcached_return_t" title="memcached_return_t"><code class="xref c c-type docutils literal notranslate"><span class="pre">memcached_return_t</span></code></a>.
 691 On success the value will be <a class="reference internal" href="client_errors/MEMCACHED_SUCCESS.html#c.MEMCACHED_SUCCESS" title="MEMCACHED_SUCCESS"><code class="xref c c-type docutils literal notranslate"><span class="pre">MEMCACHED_SUCCESS</span></code></a>.
 692 Use <a class="reference internal" href="memcached_strerror.html#c.memcached_strerror" title="memcached_strerror"><code class="xref c c-func docutils literal notranslate"><span class="pre">memcached_strerror()</span></code></a> to translate this value to a printable string.</p>
 693 <p>For <a class="reference internal" href="#c.memcached_replace" title="memcached_replace"><code class="xref c c-func docutils literal notranslate"><span class="pre">memcached_replace()</span></code></a> and <a class="reference internal" href="#c.memcached_add" title="memcached_add"><code class="xref c c-func docutils literal notranslate"><span class="pre">memcached_add()</span></code></a>, <a class="reference internal" href="client_errors/MEMCACHED_NOTSTORED.html#c.MEMCACHED_NOTSTORED" title="MEMCACHED_NOTSTORED"><code class="xref c c-type docutils literal notranslate"><span class="pre">MEMCACHED_NOTSTORED</span></code></a> is a legitimate error in the case of a collision.</p>
 694 </div>
 695 <div class="section" id="see-also">
 696 <h2>SEE ALSO<a class="headerlink" href="#see-also" title="Permalink to this headline">¶</a></h2>
 697 <p><em class="manpage">memcached(1)</em> <em class="manpage">libmemcached(3)</em> <em class="manpage">memcached_strerror(3)</em> <em class="manpage">memcached_prepend(3)</em> <em class="manpage">memcached_cas(3)</em> <em class="manpage">memcached_append(3)</em></p>
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