git.m6w6.name Git - m6w6/libmemcached/blob - libmemcached/util/ping.cc

   1 /*  vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
   2  *
   3  *  Libmemcached library
   4  *
   5  *  Copyright (C) 2011 Data Differential, http://datadifferential.com/
   6  *  Copyright (C) 2010 Brian Aker All rights reserved.
   7  *
   8  *  Redistribution and use in source and binary forms, with or without
   9  *  modification, are permitted provided that the following conditions are
  10  *  met:
  11  *
  12  *      * Redistributions of source code must retain the above copyright
  13  *  notice, this list of conditions and the following disclaimer.
  14  *
  15  *      * Redistributions in binary form must reproduce the above
  16  *  copyright notice, this list of conditions and the following disclaimer
  17  *  in the documentation and/or other materials provided with the
  18  *  distribution.
  19  *
  20  *      * The names of its contributors may not be used to endorse or
  21  *  promote products derived from this software without specific prior
  22  *  written permission.
  23  *
  24  *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  25  *  "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  26  *  LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  27  *  A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  28  *  OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  29  *  SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  30  *  LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  31  *  DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  32  *  THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  33  *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  34  *  OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  35  *
  36  * Summary: connects to a host, and makes sure it is alive.
  37  *
  38  */
  39
  40 #include <libmemcached/common.h>
  41 #include <libmemcached/memcached_util.h>
  42
  43
  44 bool libmemcached_util_ping(const char *hostname, in_port_t port, memcached_return_t *ret)
  45 {
  46   memcached_return_t unused;
  47   if (not ret)
  48     ret= &unused;
  49
  50   memcached_st *memc_ptr= memcached_create(NULL);
  51   if (not memc_ptr)
  52   {
  53     *ret= MEMCACHED_MEMORY_ALLOCATION_FAILURE;
  54     return false;
  55   }
  56
  57   memcached_return_t rc= memcached_server_add(memc_ptr, hostname, port);
  58   if (memcached_success(rc))
  59   {
  60     rc= memcached_version(memc_ptr);
  61   }
  62
  63   if (memcached_failed(rc) and rc == MEMCACHED_SOME_ERRORS)
  64   {
  65     memcached_server_instance_st instance=
  66       memcached_server_instance_by_position(memc_ptr, 0);
  67
  68     if (instance and instance->error_messages)
  69     {
  70       rc= memcached_server_error_return(instance);
  71     }
  72   }
  73   memcached_free(memc_ptr);
  74
  75   *ret= rc;
  76
  77   return memcached_success(rc);
  78 }