Ed Schouten a15ec0a5e4 Backport two small fixes from the MPSAFE TTY branch in Perforce:
- Implement IMAXBEL. It turned out the IMAXBEL termios switch was marked
  as supported, while it had not been implemented.

- Don't go into the high watermark when in canonical mode, no data has
  been canonicalized and the input buffer is full. This caused the
  terminal to lock up. This prevented users from pressing
  backspace/^U/etc in such cases.

  This could easily be simulated by pasting a very big amount of data in
  a shell with sh(1) in canonical mode.

Obtained from:	//depot/projects/mpsafetty/...
2008-08-29 15:02:50 +00:00
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