git.m6w6.name Git - m6w6/libmemcached/blob - libmemcached/do.cc

   1 /* LibMemcached
   2  * Copyright (C) 2006-2010 Brian Aker
   3  * All rights reserved.
   4  *
   5  * Use and distribution licensed under the BSD license.  See
   6  * the COPYING file in the parent directory for full text.
   7  *
   8  * Summary:
   9  *
  10  */
  11
  12 #include <libmemcached/common.h>
  13
  14 static memcached_return_t _vdo_udp(org::libmemcached::Instance* instance,
  15                                    libmemcached_io_vector_st vector[],
  16                                    const size_t count)
  17 {
  18 #ifndef __MINGW32__
  19   if (vector[0].buffer or vector[0].length)
  20   {
  21     return memcached_set_error(*instance->root, MEMCACHED_NOT_SUPPORTED, MEMCACHED_AT,
  22                                memcached_literal_param("UDP messages was attempted, but vector was not setup for it"));
  23   }
  24
  25   struct msghdr msg;
  26   memset(&msg, 0, sizeof(msg));
  27
  28   increment_udp_message_id(instance);
  29   vector[0].buffer= instance->write_buffer;
  30   vector[0].length= UDP_DATAGRAM_HEADER_LENGTH;
  31
  32   msg.msg_iov= (struct iovec*)vector;
  33 #if defined(TARGET_OS_OSX) && TARGET_OS_OSX
  34   msg.msg_iovlen= int(count);
  35 #else
  36   msg.msg_iovlen= count;
  37 #endif
  38
  39   uint32_t retry= 5;
  40   while (--retry)
  41   {
  42     ssize_t sendmsg_length= ::sendmsg(instance->fd, &msg, 0);
  43     if (sendmsg_length > 0)
  44     {
  45       break;
  46     }
  47     else if (sendmsg_length < 0)
  48     {
  49       if (errno == EMSGSIZE)
  50       {
  51         return memcached_set_error(*instance, MEMCACHED_WRITE_FAILURE, MEMCACHED_AT);
  52       }
  53
  54       return memcached_set_errno(*instance, errno, MEMCACHED_AT);
  55     }
  56   }
  57
  58   return MEMCACHED_SUCCESS;
  59 #else
  60   return MEMCACHED_FAILURE;
  61 #endif
  62 }
  63
  64 memcached_return_t memcached_vdo(org::libmemcached::Instance* instance,
  65                                  libmemcached_io_vector_st vector[],
  66                                  const size_t count,
  67                                  const bool with_flush)
  68 {
  69   memcached_return_t rc;
  70
  71   assert_msg(vector, "Invalid vector passed");
  72
  73   if (memcached_failed(rc= memcached_connect(instance)))
  74   {
  75     WATCHPOINT_ERROR(rc);
  76     assert_msg(instance->error_messages, "memcached_connect() returned an error but the Instance showed none.");
  77     return rc;
  78   }
  79
  80   /*
  81   ** Since non buffering ops in UDP mode dont check to make sure they will fit
  82   ** before they start writing, if there is any data in buffer, clear it out,
  83   ** otherwise we might get a partial write.
  84   **/
  85   if (memcached_is_udp(instance->root))
  86   {
  87     return _vdo_udp(instance, vector, count);
  88   }
  89
  90   bool sent_success= memcached_io_writev(instance, vector, count, with_flush);
  91   if (sent_success == false)
  92   {
  93     assert(memcached_last_error(instance->root) == MEMCACHED_SUCCESS);
  94     if (memcached_last_error(instance->root) == MEMCACHED_SUCCESS)
  95     {
  96       assert(memcached_last_error(instance->root) != MEMCACHED_SUCCESS);
  97       return memcached_set_error(*instance, MEMCACHED_WRITE_FAILURE, MEMCACHED_AT);
  98     }
  99     else
 100     {
 101       rc= memcached_last_error(instance->root);
 102     }
 103   }
 104   else if (memcached_is_replying(instance->root))
 105   {
 106     memcached_server_response_increment(instance);
 107   }
 108
 109   return rc;
 110 }