static void CALLBACK ReadDirectoryChangesNotification(DWORD errCode,
DWORD bytesTransfered, LPOVERLAPPED overlapped)
{
ScopedCritSec cs(&g_threadCritSec);
OverlappedEx *over = (OverlappedEx*)overlapped;
WatchedDir* wd = (WatchedDir*)over->data;
lf(L"ReadDirectoryChangesNotification() dir: %s, numBytes: %d", wd->dirPath, (int)bytesTransfered);
CrashIf(wd != wd->overlapped.data);
if (errCode == ERROR_OPERATION_ABORTED) {
lf(" ERROR_OPERATION_ABORTED");
DeleteWatchedDir(wd);
InterlockedDecrement(&gRemovalsPending);
return;
}
// This might mean overflow? Not sure.
if (!bytesTransfered)
return;
FILE_NOTIFY_INFORMATION *notify = (FILE_NOTIFY_INFORMATION*)wd->buf;
// collect files that changed, removing duplicates
WStrVec changedFiles;
for (;;) {
ScopedMem<WCHAR> fileName(str::DupN(notify->FileName, notify->FileNameLength / sizeof(WCHAR)));
// files can get updated either by writing to them directly or
// by writing to a .tmp file first and then moving that file in place
// (the latter only yields a RENAMED action with the expected file name)
if (notify->Action == FILE_ACTION_MODIFIED || notify->Action == FILE_ACTION_RENAMED_NEW_NAME) {
if (!changedFiles.Contains(fileName)) {
lf(L"ReadDirectoryChangesNotification() FILE_ACTION_MODIFIED, for '%s'", fileName);
changedFiles.Append(fileName.StealData());
} else {
lf(L"ReadDirectoryChangesNotification() eliminating duplicate notification for '%s'", fileName);
}
} else {
lf(L"ReadDirectoryChangesNotification() action=%d, for '%s'", (int)notify->Action, fileName);
}
// step to the next entry if there is one
DWORD nextOff = notify->NextEntryOffset;
if (!nextOff)
break;
notify = (FILE_NOTIFY_INFORMATION *)((char*)notify + nextOff);
}
StartMonitoringDirForChanges(wd);
for (const WCHAR *f : changedFiles) {
NotifyAboutFile(wd, f);
}
}
static void CALLBACK ReadDirectoryChangesNotification(DWORD errCode,
DWORD bytesTransfered, LPOVERLAPPED overlapped)
{
ScopedCritSec cs(&g_threadCritSec);
OverlappedEx *over = (OverlappedEx*)overlapped;
WatchedDir* wd = (WatchedDir*)over->data;
lf(L"ReadDirectoryChangesNotification() dir: %s, numBytes: %d", wd->dirPath, (int)bytesTransfered);
CrashIf(wd != wd->overlapped.data);
if (errCode == ERROR_OPERATION_ABORTED) {
lf(" ERROR_OPERATION_ABORTED");
DeleteWatchedDir(wd);
return;
}
// This might mean overflow? Not sure.
if (!bytesTransfered)
return;
FILE_NOTIFY_INFORMATION *notify = (FILE_NOTIFY_INFORMATION*)wd->buf;
// collect files that changed, removing duplicates
WStrVec changedFiles;
for (;;) {
WCHAR *fileName = str::DupN(notify->FileName, notify->FileNameLength / sizeof(WCHAR));
if (notify->Action == FILE_ACTION_MODIFIED) {
if (!changedFiles.Contains(fileName)) {
lf(L"ReadDirectoryChangesNotification() FILE_ACTION_MODIFIED, for '%s'", fileName);
changedFiles.Append(fileName);
fileName = NULL;
} else {
lf(L"ReadDirectoryChangesNotification() eliminating duplicate notification for '%s'", fileName);
}
} else {
lf(L"ReadDirectoryChangesNotification() action=%d, for '%s'", (int)notify->Action, fileName);
}
free(fileName);
// step to the next entry if there is one
DWORD nextOff = notify->NextEntryOffset;
if (!nextOff)
break;
notify = (FILE_NOTIFY_INFORMATION *)((char*)notify + nextOff);
}
StartMonitoringDirForChanges(wd);
for (WCHAR **f = changedFiles.IterStart(); f; f = changedFiles.IterNext()) {
NotifyAboutFile(wd, *f);
}
}
static void RemoveWatchedDirIfNotReferenced(WatchedDir *wd)
{
if (IsWatchedDirReferenced(wd))
return;
WatchedDir **currPtr = &g_firstDir;
WatchedDir *curr;
for (;;) {
curr = *currPtr;
CrashAlwaysIf(!curr);
if (curr == wd)
break;
currPtr = &(curr->next);
}
WatchedDir *toRemove = curr;
*currPtr = toRemove->next;
DeleteWatchedDir(toRemove);
}
static WatchedDir *NewWatchedDir(const WCHAR *dirPath)
{
WatchedDir *wd = AllocStruct<WatchedDir>();
wd->dirPath = str::Dup(dirPath);
wd->hDir = CreateFile(
dirPath, FILE_LIST_DIRECTORY,
FILE_SHARE_READ|FILE_SHARE_DELETE|FILE_SHARE_WRITE,
NULL, OPEN_EXISTING,
FILE_FLAG_BACKUP_SEMANTICS | FILE_FLAG_OVERLAPPED, NULL);
if (!wd->hDir)
goto Failed;
wd->overlapped.hEvent = CreateEvent(NULL, FALSE, FALSE, NULL);
if (!wd->overlapped.hEvent)
goto Failed;
// start watching the directory
wd->currBuffer = 0;
ReadDirectoryChangesW(
wd->hDir,
&wd->buffer[wd->currBuffer], /* read results buffer */
sizeof(wd->buffer[wd->currBuffer]), /* length of buffer */
FALSE, /* monitoring option */
FILE_NOTIFY_CHANGE_LAST_WRITE, /* filter conditions */
NULL, /* bytes returned */
&wd->overlapped, /* overlapped buffer */
NULL); /* completion routine */
wd->next = g_firstDir;
g_firstDir = wd;
return wd;
Failed:
DeleteWatchedDir(wd);
return NULL;
}
