git.m6w6.name Git - awesomized/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(memcached_server_write_instance_st 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   WATCHPOINT_ASSERT(count);
  22   WATCHPOINT_ASSERT(vector);
  23
  24   if (memcached_failed(rc= memcached_connect(instance)))
  25   {
  26     WATCHPOINT_ERROR(rc);
  27     assert_msg(instance->error_messages, "memcached_connect() returned an error but the memcached_server_write_instance_st showed none.");
  28     return rc;
  29   }
  30
  31   /*
  32   ** Since non buffering ops in UDP mode dont check to make sure they will fit
  33   ** before they start writing, if there is any data in buffer, clear it out,
  34   ** otherwise we might get a partial write.
  35   **/
  36   if (memcached_is_udp(instance->root))
  37   {
  38     if (vector->buffer or vector->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     size_t write_length= io_vector_total_size(vector, 11) +UDP_DATAGRAM_HEADER_LENGTH;
  45
  46     if (write_length > MAX_UDP_DATAGRAM_LENGTH - UDP_DATAGRAM_HEADER_LENGTH)
  47     {
  48       return MEMCACHED_WRITE_FAILURE;
  49     }
  50
  51     return MEMCACHED_NOT_SUPPORTED;
  52   }
  53
  54   ssize_t sent_length= memcached_io_writev(instance, vector, count, with_flush);
  55   size_t command_length= 0;
  56   for (uint32_t x= 0; x < count; ++x, vector++)
  57   {
  58     command_length+= vector->length;
  59   }
  60
  61   if (sent_length == -1 or size_t(sent_length) != command_length)
  62   {
  63     rc= MEMCACHED_WRITE_FAILURE;
  64     WATCHPOINT_ERROR(rc);
  65     WATCHPOINT_ERRNO(errno);
  66   }
  67   else if (memcached_is_replying(instance->root))
  68   {
  69     memcached_server_response_increment(instance);
  70   }
  71
  72   return rc;
  73 }