int uv_fs_event_init(uv_loop_t* loop, uv_fs_event_t* handle,
const char* filename, uv_fs_event_cb cb) {
int name_size;
DWORD attr, last_error;
wchar_t* dir = NULL, *dir_to_watch, *filenamew;
wchar_t short_path[MAX_PATH];
uv_fs_event_init_handle(loop, handle, filename, cb);
/* Convert name to UTF16. */
name_size = uv_utf8_to_utf16(filename, NULL, 0) * sizeof(wchar_t);
filenamew = (wchar_t*)malloc(name_size);
if (!filenamew) {
uv_fatal_error(ERROR_OUTOFMEMORY, "malloc");
}
if (!uv_utf8_to_utf16(filename, filenamew,
name_size / sizeof(wchar_t))) {
uv__set_sys_error(loop, GetLastError());
return -1;
}
/* Determine whether filename is a file or a directory. */
attr = GetFileAttributesW(filenamew);
if (attr == INVALID_FILE_ATTRIBUTES) {
last_error = GetLastError();
goto error;
}
handle->is_path_dir = (attr & FILE_ATTRIBUTE_DIRECTORY) ? 1 : 0;
if (handle->is_path_dir) {
/* filename is a directory, so that's the directory that we will watch. */
dir_to_watch = filenamew;
} else {
/*
* filename is a file. So we split filename into dir & file parts, and
* watch the dir directory.
*/
/* Convert to short path. */
if (!GetShortPathNameW(filenamew, short_path, COUNTOF(short_path))) {
last_error = GetLastError();
goto error;
}
if (uv_split_path(filenamew, &dir, &handle->filew) != 0) {
last_error = GetLastError();
goto error;
}
if (uv_split_path(short_path, NULL, &handle->short_filew) != 0) {
last_error = GetLastError();
goto error;
}
dir_to_watch = dir;
}
handle->dir_handle = CreateFileW(dir_to_watch,
FILE_LIST_DIRECTORY,
FILE_SHARE_READ | FILE_SHARE_DELETE |
FILE_SHARE_WRITE,
NULL,
OPEN_EXISTING,
FILE_FLAG_BACKUP_SEMANTICS |
FILE_FLAG_OVERLAPPED,
NULL);
if (dir) {
free(dir);
dir = NULL;
}
if (handle->dir_handle == INVALID_HANDLE_VALUE) {
last_error = GetLastError();
goto error;
}
if (CreateIoCompletionPort(handle->dir_handle,
loop->iocp,
(ULONG_PTR)handle,
0) == NULL) {
last_error = GetLastError();
goto error;
}
handle->buffer = (char*)_aligned_malloc(uv_directory_watcher_buffer_size,
sizeof(DWORD));
if (!handle->buffer) {
uv_fatal_error(ERROR_OUTOFMEMORY, "malloc");
}
memset(&(handle->req.overlapped), 0, sizeof(handle->req.overlapped));
if (!ReadDirectoryChangesW(handle->dir_handle,
handle->buffer,
uv_directory_watcher_buffer_size,
FALSE,
FILE_NOTIFY_CHANGE_FILE_NAME |
FILE_NOTIFY_CHANGE_DIR_NAME |
FILE_NOTIFY_CHANGE_ATTRIBUTES |
FILE_NOTIFY_CHANGE_SIZE |
FILE_NOTIFY_CHANGE_LAST_WRITE |
FILE_NOTIFY_CHANGE_LAST_ACCESS |
FILE_NOTIFY_CHANGE_CREATION |
FILE_NOTIFY_CHANGE_SECURITY,
NULL,
&handle->req.overlapped,
NULL)) {
last_error = GetLastError();
goto error;
}
handle->req_pending = 1;
return 0;
error:
if (handle->filename) {
free(handle->filename);
handle->filename = NULL;
}
if (handle->filew) {
free(handle->filew);
handle->filew = NULL;
}
if (handle->short_filew) {
free(handle->short_filew);
handle->short_filew = NULL;
}
if (handle->dir_handle != INVALID_HANDLE_VALUE) {
CloseHandle(handle->dir_handle);
handle->dir_handle = INVALID_HANDLE_VALUE;
}
if (handle->buffer) {
_aligned_free(handle->buffer);
handle->buffer = NULL;
}
uv__set_sys_error(loop, last_error);
return -1;
}
int uv_fs_event_start(uv_fs_event_t* handle,
uv_fs_event_cb cb,
const char* path,
unsigned int flags) {
int name_size, is_path_dir;
DWORD attr, last_error;
WCHAR* dir = NULL, *dir_to_watch, *pathw = NULL;
WCHAR short_path[MAX_PATH];
if (uv__is_active(handle))
return UV_EINVAL;
handle->cb = cb;
handle->path = uv__strdup(path);
if (!handle->path) {
uv_fatal_error(ERROR_OUTOFMEMORY, "uv__malloc");
}
uv__handle_start(handle);
/* Convert name to UTF16. */
name_size = uv_utf8_to_utf16(path, NULL, 0) * sizeof(WCHAR);
pathw = (WCHAR*)uv__malloc(name_size);
if (!pathw) {
uv_fatal_error(ERROR_OUTOFMEMORY, "uv__malloc");
}
if (!uv_utf8_to_utf16(path, pathw,
name_size / sizeof(WCHAR))) {
return uv_translate_sys_error(GetLastError());
}
/* Determine whether path is a file or a directory. */
attr = GetFileAttributesW(pathw);
if (attr == INVALID_FILE_ATTRIBUTES) {
last_error = GetLastError();
goto error;
}
is_path_dir = (attr & FILE_ATTRIBUTE_DIRECTORY) ? 1 : 0;
if (is_path_dir) {
/* path is a directory, so that's the directory that we will watch. */
handle->dirw = pathw;
dir_to_watch = pathw;
} else {
/*
* path is a file. So we split path into dir & file parts, and
* watch the dir directory.
*/
/* Convert to short path. */
if (!GetShortPathNameW(pathw, short_path, ARRAY_SIZE(short_path))) {
last_error = GetLastError();
goto error;
}
if (uv_split_path(pathw, &dir, &handle->filew) != 0) {
last_error = GetLastError();
goto error;
}
if (uv_split_path(short_path, NULL, &handle->short_filew) != 0) {
last_error = GetLastError();
goto error;
}
dir_to_watch = dir;
uv__free(pathw);
pathw = NULL;
}
handle->dir_handle = CreateFileW(dir_to_watch,
FILE_LIST_DIRECTORY,
FILE_SHARE_READ | FILE_SHARE_DELETE |
FILE_SHARE_WRITE,
NULL,
OPEN_EXISTING,
FILE_FLAG_BACKUP_SEMANTICS |
FILE_FLAG_OVERLAPPED,
NULL);
if (dir) {
uv__free(dir);
dir = NULL;
}
if (handle->dir_handle == INVALID_HANDLE_VALUE) {
last_error = GetLastError();
goto error;
}
if (CreateIoCompletionPort(handle->dir_handle,
handle->loop->iocp,
(ULONG_PTR)handle,
0) == NULL) {
last_error = GetLastError();
goto error;
}
if (!handle->buffer) {
handle->buffer = (char*)uv__malloc(uv_directory_watcher_buffer_size);
}
if (!handle->buffer) {
uv_fatal_error(ERROR_OUTOFMEMORY, "uv__malloc");
}
memset(&(handle->req.u.io.overlapped), 0,
sizeof(handle->req.u.io.overlapped));
if (!ReadDirectoryChangesW(handle->dir_handle,
handle->buffer,
uv_directory_watcher_buffer_size,
(flags & UV_FS_EVENT_RECURSIVE) ? TRUE : FALSE,
FILE_NOTIFY_CHANGE_FILE_NAME |
FILE_NOTIFY_CHANGE_DIR_NAME |
FILE_NOTIFY_CHANGE_ATTRIBUTES |
FILE_NOTIFY_CHANGE_SIZE |
FILE_NOTIFY_CHANGE_LAST_WRITE |
FILE_NOTIFY_CHANGE_LAST_ACCESS |
FILE_NOTIFY_CHANGE_CREATION |
FILE_NOTIFY_CHANGE_SECURITY,
NULL,
&handle->req.u.io.overlapped,
NULL)) {
last_error = GetLastError();
goto error;
}
handle->req_pending = 1;
return 0;
error:
if (handle->path) {
uv__free(handle->path);
handle->path = NULL;
}
if (handle->filew) {
uv__free(handle->filew);
handle->filew = NULL;
}
if (handle->short_filew) {
uv__free(handle->short_filew);
handle->short_filew = NULL;
}
uv__free(pathw);
if (handle->dir_handle != INVALID_HANDLE_VALUE) {
CloseHandle(handle->dir_handle);
handle->dir_handle = INVALID_HANDLE_VALUE;
}
if (handle->buffer) {
uv__free(handle->buffer);
handle->buffer = NULL;
}
return uv_translate_sys_error(last_error);
}
void uv_process_fs_event_req(uv_loop_t* loop, uv_req_t* req,
uv_fs_event_t* handle) {
FILE_NOTIFY_INFORMATION* file_info;
int sizew, size, result;
char* filename = NULL;
wchar_t* filenamew, *long_filenamew = NULL;
DWORD offset = 0;
assert(req->type == UV_FS_EVENT_REQ);
assert(handle->req_pending);
handle->req_pending = 0;
/* If we're closing, don't report any callbacks, and just push the handle */
/* onto the endgame queue. */
if (handle->flags & UV_HANDLE_CLOSING) {
uv_want_endgame(loop, (uv_handle_t*) handle);
return;
};
file_info = (FILE_NOTIFY_INFORMATION*)(handle->buffer + offset);
if (REQ_SUCCESS(req)) {
if (req->overlapped.InternalHigh > 0) {
do {
file_info = (FILE_NOTIFY_INFORMATION*)((char*)file_info + offset);
assert(!filename);
assert(!long_filenamew);
/*
* Fire the event only if we were asked to watch a directory,
* or if the filename filter matches.
*/
if (handle->dirw ||
_wcsnicmp(handle->filew, file_info->FileName,
file_info->FileNameLength / sizeof(wchar_t)) == 0 ||
_wcsnicmp(handle->short_filew, file_info->FileName,
file_info->FileNameLength / sizeof(wchar_t)) == 0) {
if (handle->dirw) {
/*
* We attempt to convert the file name to its long form for
* events that still point to valid files on disk.
* For removed and renamed events, we do not provide the file name.
*/
if (file_info->Action != FILE_ACTION_REMOVED &&
file_info->Action != FILE_ACTION_RENAMED_OLD_NAME) {
/* Construct a full path to the file. */
size = wcslen(handle->dirw) +
file_info->FileNameLength / sizeof(wchar_t) + 2;
filenamew = (wchar_t*)malloc(size * sizeof(wchar_t));
if (!filenamew) {
uv_fatal_error(ERROR_OUTOFMEMORY, "malloc");
}
_snwprintf(filenamew, size, L"%s\\%s", handle->dirw,
file_info->FileName);
filenamew[size - 1] = L'\0';
/* Convert to long name. */
size = GetLongPathNameW(filenamew, NULL, 0);
if (size) {
long_filenamew = (wchar_t*)malloc(size * sizeof(wchar_t));
if (!long_filenamew) {
uv_fatal_error(ERROR_OUTOFMEMORY, "malloc");
}
size = GetLongPathNameW(filenamew, long_filenamew, size);
if (size) {
long_filenamew[size] = '\0';
} else {
free(long_filenamew);
long_filenamew = NULL;
}
}
free(filenamew);
if (long_filenamew) {
/* Get the file name out of the long path. */
result = uv_split_path(long_filenamew, NULL, &filenamew);
free(long_filenamew);
if (result == 0) {
long_filenamew = filenamew;
sizew = -1;
} else {
long_filenamew = NULL;
}
}
/*
* If we couldn't get the long name - just use the name
* provided by ReadDirectoryChangesW.
*/
if (!long_filenamew) {
filenamew = file_info->FileName;
sizew = file_info->FileNameLength / sizeof(wchar_t);
}
} else {
/* Removed or renamed callbacks don't provide filename. */
filenamew = NULL;
}
} else {
/* We already have the long name of the file, so just use it. */
filenamew = handle->filew;
sizew = -1;
}
if (filenamew) {
/* Convert the filename to utf8. */
size = uv_utf16_to_utf8(filenamew,
sizew,
NULL,
0);
if (size) {
filename = (char*)malloc(size + 1);
if (!filename) {
uv_fatal_error(ERROR_OUTOFMEMORY, "malloc");
}
size = uv_utf16_to_utf8(filenamew,
sizew,
filename,
size);
if (size) {
filename[size] = '\0';
} else {
free(filename);
filename = NULL;
}
}
}
switch (file_info->Action) {
case FILE_ACTION_ADDED:
case FILE_ACTION_REMOVED:
case FILE_ACTION_RENAMED_OLD_NAME:
case FILE_ACTION_RENAMED_NEW_NAME:
handle->cb(handle, filename, UV_RENAME, 0);
break;
case FILE_ACTION_MODIFIED:
handle->cb(handle, filename, UV_CHANGE, 0);
break;
}
free(filename);
filename = NULL;
free(long_filenamew);
long_filenamew = NULL;
}
offset = file_info->NextEntryOffset;
} while (offset && !(handle->flags & UV_HANDLE_CLOSING));
} else {
handle->cb(handle, NULL, UV_CHANGE, 0);
}
} else {
uv__set_sys_error(loop, GET_REQ_ERROR(req));
handle->cb(handle, NULL, 0, -1);
}
if (!(handle->flags & UV_HANDLE_CLOSING)) {
uv_fs_event_queue_readdirchanges(loop, handle);
} else {
uv_want_endgame(loop, (uv_handle_t*)handle);
}
}