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/*-
* Copyright (c) 2014-2020 MongoDB, Inc.
* Copyright (c) 2008-2014 WiredTiger, Inc.
* All rights reserved.
*
* See the file LICENSE for redistribution information.
*/
#include "wt_internal.h"
/*
* __wt_win_map --
* Map a file into memory.
*/
int
__wt_win_map(WT_FILE_HANDLE *file_handle, WT_SESSION *wt_session, void *mapped_regionp,
size_t *lenp, void *mapped_cookiep)
{
WT_DECL_RET;
WT_FILE_HANDLE_WIN *win_fh;
WT_SESSION_IMPL *session;
wt_off_t file_size;
DWORD windows_error;
size_t len;
void *map, *mapped_cookie;
win_fh = (WT_FILE_HANDLE_WIN *)file_handle;
session = (WT_SESSION_IMPL *)wt_session;
/*
* There's no locking here to prevent the underlying file from changing underneath us, our
* caller needs to ensure consistency of the mapped region vs. any other file activity.
*/
WT_RET(__wt_win_fs_size(file_handle->file_system, wt_session, file_handle->name, &file_size));
len = (size_t)file_size;
__wt_verbose(session, WT_VERB_HANDLEOPS, "%s: memory-map: %" WT_SIZET_FMT " bytes",
file_handle->name, len);
mapped_cookie = CreateFileMappingW(win_fh->filehandle, NULL, PAGE_READONLY, 0, 0, NULL);
if (mapped_cookie == NULL) {
windows_error = __wt_getlasterror();
ret = __wt_map_windows_error(windows_error);
__wt_err(session, ret, "%s: memory-map: CreateFileMappingW: %s", file_handle->name,
__wt_formatmessage(session, windows_error));
return (ret);
}
if ((map = MapViewOfFile(mapped_cookie, FILE_MAP_READ, 0, 0, len)) == NULL) {
/* Retrieve the error before cleaning up. */
windows_error = __wt_getlasterror();
ret = __wt_map_windows_error(windows_error);
(void)CloseHandle(mapped_cookie);
__wt_err(session, ret, "%s: memory-map: MapViewOfFile: %s", file_handle->name,
__wt_formatmessage(session, windows_error));
return (ret);
}
*(void **)mapped_cookiep = mapped_cookie;
*(void **)mapped_regionp = map;
*lenp = len;
return (0);
}
/*
* __wt_win_unmap --
* Remove a memory mapping.
*/
int
__wt_win_unmap(WT_FILE_HANDLE *file_handle, WT_SESSION *wt_session, void *mapped_region,
size_t length, void *mapped_cookie)
{
WT_DECL_RET;
WT_FILE_HANDLE_WIN *win_fh;
WT_SESSION_IMPL *session;
DWORD windows_error;
win_fh = (WT_FILE_HANDLE_WIN *)file_handle;
session = (WT_SESSION_IMPL *)wt_session;
__wt_verbose(session, WT_VERB_HANDLEOPS, "%s: memory-unmap: %" WT_SIZET_FMT " bytes",
file_handle->name, length);
if (UnmapViewOfFile(mapped_region) == 0) {
windows_error = __wt_getlasterror();
ret = __wt_map_windows_error(windows_error);
__wt_err(session, ret, "%s: memory-unmap: UnmapViewOfFile: %s", file_handle->name,
__wt_formatmessage(session, windows_error));
}
if (CloseHandle(*(void **)mapped_cookie) == 0) {
windows_error = __wt_getlasterror();
ret = __wt_map_windows_error(windows_error);
__wt_err(session, ret, "%s: memory-unmap: CloseHandle: %s", file_handle->name,
__wt_formatmessage(session, windows_error));
}
return (ret);
}
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