git.m6w6.name Git - awesomized/libmemcached/blob - libmemcached/util/pid.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 determines what its pid is
  37  *
  38  */
  39
  40 #include <libmemcached/common.h>
  41 #include <libmemcached/memcached_util.h>
  42
  43
  44 // Never look at the stat object directly.
  45
  46
  47 pid_t libmemcached_util_getpid(const char *hostname, in_port_t port, memcached_return_t *ret)
  48 {
  49   pid_t pid= -1;
  50
  51   memcached_return_t unused;
  52   if (not ret)
  53     ret= &unused;
  54
  55   memcached_st *memc_ptr= memcached_create(NULL);
  56   if (not memc_ptr)
  57   {
  58     *ret= MEMCACHED_MEMORY_ALLOCATION_FAILURE;
  59     return -1;
  60   }
  61
  62   memcached_return_t rc= memcached_server_add(memc_ptr, hostname, port);
  63   if (memcached_success(rc))
  64   {
  65     memcached_stat_st *stat= memcached_stat(memc_ptr, NULL, &rc);
  66     if (memcached_success(rc) and stat and stat->pid != -1)
  67     {
  68       pid= stat->pid;
  69     }
  70     else if (memcached_success(rc))
  71     {
  72       rc= MEMCACHED_UNKNOWN_STAT_KEY; // Something went wrong if this happens
  73     }
  74     else if (rc == MEMCACHED_SOME_ERRORS) // Generic answer, we will now find the specific reason (if one exists)
  75     {
  76       memcached_server_instance_st instance=
  77         memcached_server_instance_by_position(memc_ptr, 0);
  78
  79       assert_msg(instance and instance->error_messages, " ");
  80       if (instance and instance->error_messages)
  81       {
  82         rc= memcached_server_error_return(instance);
  83       }
  84     }
  85
  86     memcached_stat_free(memc_ptr, stat);
  87   }
  88   memcached_free(memc_ptr);
  89
  90   *ret= rc;
  91
  92   return pid;
  93 }
  94