https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=7947581905637b837558ae9a2f1d35b8ab433e90
commit 7947581905637b837558ae9a2f1d35b8ab433e90 Author: Corinna Vinschen <[email protected]> Date: Mon Mar 16 10:20:16 2020 +0100 Cygwin: serial: wait for CancelIo completion Per https://devblogs.microsoft.com/oldnewthing/20110202-00/?p=11613 GetOverlappedResult must be called blocking, waiting for the overlapped operation to complete. Signed-off-by: Corinna Vinschen <[email protected]> Diff: --- winsup/cygwin/fhandler_serial.cc | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/winsup/cygwin/fhandler_serial.cc b/winsup/cygwin/fhandler_serial.cc index f92fc7039..f729765e0 100644 --- a/winsup/cygwin/fhandler_serial.cc +++ b/winsup/cygwin/fhandler_serial.cc @@ -135,7 +135,7 @@ fhandler_serial::raw_read (void *ptr, size_t& ulen) PurgeComm apparently discards in-flight bytes while CancelIo only stops the overlapped IO routine. */ CancelIo (get_handle ()); - if (GetOverlappedResult (get_handle (), &io_status, &n, FALSE)) + if (GetOverlappedResult (get_handle (), &io_status, &n, TRUE)) tot = n; else if (GetLastError () != ERROR_OPERATION_ABORTED) goto err;
