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