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Takashi Yano 3ad0891b1c Cygwin: pty: Prevent potential errno overwriting.
- In push_to_pcon_screenbuffer(), open() and ioctl() are called.
  Since push_to_pcon_screenbuffer() is called in read() and write(),
  errno which is set in read() and write() code may be overwritten
  in open() or ioctl() call. This patch prevent this situation.
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