static Status OpenFile(const OsPath& pathname, int oflag, HANDLE& hFile)
{
WinScopedPreserveLastError s;
const DWORD access = DesiredAccess(oflag);
const DWORD share = ShareMode(oflag);
const DWORD create = CreationDisposition(oflag);
const DWORD flags = FlagsAndAttributes();
hFile = CreateFileW(OsString(pathname).c_str(), access, share, 0, create, flags, 0);
if(hFile == INVALID_HANDLE_VALUE)
WARN_RETURN(StatusFromWin());
return INFO::OK;
}
Status sys_cursor_free(sys_cursor cursor)
{
// bail now to prevent potential confusion below; there's nothing to do.
if(!cursor)
return INFO::OK;
// if the cursor being freed is active, restore the default arrow
// (just for safety).
if(cursor_from_HCURSOR(GetCursor()) == cursor)
WARN_IF_ERR(sys_cursor_set(0));
if(!DestroyIcon(HICON_from_cursor(cursor)))
WARN_RETURN(StatusFromWin());
return INFO::OK;
}
Status PollCompletionPort(HANDLE hIOCP, DWORD timeout, DWORD& bytesTransferred, ULONG_PTR& key, OVERLAPPED*& ovl)
{
if(hIOCP == 0)
return ERR::INVALID_HANDLE; // NOWARN (happens if called before the first Attach)
WinScopedPreserveLastError s;
bytesTransferred = 0;
key = 0;
ovl = 0;
if(GetQueuedCompletionStatus(hIOCP, &bytesTransferred, &key, &ovl, timeout))
return INFO::OK;
const Status ret = StatusFromWin();
if(ret == ERR::AGAIN || ret == ERR::ABORTED) // avoid polluting last error
SetLastError(0);
return ret; // NOWARN (let caller decide what to do)
}
