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/* LibMemcached
* Copyright (C) 2006-2010 Brian Aker
* All rights reserved.
*
* Use and distribution licensed under the BSD license. See
* the COPYING file in the parent directory for full text.
*
* Summary:
*
*/
#include <libmemcached/common.h>
memcached_return_t memcached_vdo(org::libmemcached::Instance* instance,
libmemcached_io_vector_st vector[],
const size_t count,
const bool with_flush)
{
memcached_return_t rc;
assert_msg(vector, "Invalid vector passed");
if (memcached_failed(rc= memcached_connect(instance)))
{
WATCHPOINT_ERROR(rc);
assert_msg(instance->error_messages, "memcached_connect() returned an error but the Instance showed none.");
return rc;
}
/*
** Since non buffering ops in UDP mode dont check to make sure they will fit
** before they start writing, if there is any data in buffer, clear it out,
** otherwise we might get a partial write.
**/
if (memcached_is_udp(instance->root))
{
if (vector[0].buffer or vector[0].length)
{
return memcached_set_error(*instance->root, MEMCACHED_NOT_SUPPORTED, MEMCACHED_AT,
memcached_literal_param("UDP messages was attempted, but vector was not setup for it"));
}
struct msghdr msg;
memset(&msg, 0, sizeof(msg));
increment_udp_message_id(instance);
vector[0].buffer= instance->write_buffer;
vector[0].length= UDP_DATAGRAM_HEADER_LENGTH;
msg.msg_iov= (struct iovec*)vector;
msg.msg_iovlen= count;
uint32_t retry= 5;
while (--retry)
{
ssize_t sendmsg_length= ::sendmsg(instance->fd, &msg, 0);
if (sendmsg_length > 0)
{
break;
}
else if (sendmsg_length < 0)
{
if (errno == EMSGSIZE)
{
return memcached_set_error(*instance, MEMCACHED_WRITE_FAILURE, MEMCACHED_AT);
}
return memcached_set_errno(*instance, errno, MEMCACHED_AT);
}
}
return MEMCACHED_SUCCESS;
}
bool sent_success= memcached_io_writev(instance, vector, count, with_flush);
if (sent_success == false)
{
if (memcached_last_error(instance->root) == MEMCACHED_SUCCESS)
{
return memcached_set_error(*instance, MEMCACHED_WRITE_FAILURE, MEMCACHED_AT);
}
else
{
rc= MEMCACHED_WRITE_FAILURE;
}
}
else if (memcached_is_replying(instance->root))
{
memcached_server_response_increment(instance);
}
return rc;
}
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