/*
 * Copyright 2014 MongoDB, Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */


#ifndef MONGOC_IOVEC_H
#define MONGOC_IOVEC_H


#include <bson.h>

#ifdef _WIN32
# include <stddef.h>
#else
# include <sys/uio.h>
#endif

BSON_BEGIN_DECLS


#ifdef _WIN32
typedef struct
{
   u_long  iov_len;
   char   *iov_base;
} mongoc_iovec_t;

BSON_STATIC_ASSERT(sizeof(mongoc_iovec_t) == sizeof(WSABUF));
BSON_STATIC_ASSERT(offsetof(mongoc_iovec_t, iov_base) == offsetof(WSABUF, buf));
BSON_STATIC_ASSERT(offsetof(mongoc_iovec_t, iov_len) == offsetof(WSABUF, len));

#else
typedef struct iovec mongoc_iovec_t;
#endif


BSON_END_DECLS


#endif /* MONGOC_IOVEC_H */

/*
 * Copyright 2014 MongoDB, Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */


#ifndef MONGOC_IOVEC_H
#define MONGOC_IOVEC_H


#include <bson.h>

#ifndef _WIN32
# include <sys/uio.h>
#endif


BSON_BEGIN_DECLS


#ifdef _WIN32
typedef struct
{
   u_long  iov_len;
   char   *iov_base;
} mongoc_iovec_t;
#else
typedef struct iovec mongoc_iovec_t;
#endif


BSON_END_DECLS


#endif /* MONGOC_IOVEC_H */

--- 
+++ 
@@ -21,10 +21,11 @@
 
 #include <bson.h>
 
-#ifndef _WIN32
+#ifdef _WIN32
+# include <stddef.h>
+#else
 # include <sys/uio.h>
 #endif
-
 
 BSON_BEGIN_DECLS
 
@@ -35,6 +36,11 @@
    u_long  iov_len;
    char   *iov_base;
 } mongoc_iovec_t;
+
+BSON_STATIC_ASSERT(sizeof(mongoc_iovec_t) == sizeof(WSABUF));
+BSON_STATIC_ASSERT(offsetof(mongoc_iovec_t, iov_base) == offsetof(WSABUF, buf));
+BSON_STATIC_ASSERT(offsetof(mongoc_iovec_t, iov_len) == offsetof(WSABUF, len));
+
 #else
 typedef struct iovec mongoc_iovec_t;
 #endif
CDRIVER-756: Make sure our iovec abstraction is compatible with Windows WSABUF

We cast mongoc_iovec_t to LPWSABUF in our sendmsg() wrapper
