Changes from 1.1.18 to 1.1.19

These changes are archived on ftp.crynwr.com:pub/kchanges and http://www.crynwr.com/kchanges. I cannot answer questions about Linux -- I merely summarize the kernel patches after reading them. I try to make them useful to everyone, but kernel hackers should take them with a grain of salt and read the patches themselves. The patch file is patch19.gz

• Check added to keyboard.c to make sure the tty was a real tty.
• The PTY buffer size is now half a page, and it shared across all ptys.
• Code added to serial.c to check for lost interrupts.
• New ioctl added to serial device: TIOCSERGSTRUCT
• New call added to slip/ppp.c to check for receive room (which currently always says yes, there is room).

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