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bb46627871
Don't set the write end of the pipe to non-blocking mode if the FIFO is opened in blocking mode. In fhandler_fifo::raw_write in blocking mode, wait for the write to complete rather than returning -1 with EAGAIN. If the amount to write is large, write in smaller chunks (of size determined by a new data member max_atomic_write), as in fhandler_base_overlapped. For convenience, add two new NTSTATUS codes, STATUS_THREAD_SIGNALED and STATUS_THREAD_CANCELED, to ntdll.h.
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