[PATCH] 230.4Kbps support for serial port

[Troy Curtiss]

Hi,
   Attached is a patch that enables cygwin to talk at 230400 bps on serial 
ports that support the higher rate.  It also does the necessary 
error-checking to confirm whether or not a given port is capable of 
extended bitrates.  I added B230400 (for Posix) and CBR_230400 (for Win32) 
definitions to the appropriate header files (termios.h and winbase.h, 
respectively).  I've been testing for a couple days now and it appears to 
work as designed.  (We use a lot of extended bitrate devices at work, 
mostly with Win32 code - so this simply brings the paradigm across to the 
posix side of the house.)

Question:  Upon failure (ie. trying to configure a non-230.4K capable port 
to talk 230.4K), I simply return -1...  I'm not sure whether POSIX would 
set errno = EINVAL or not... either way is fine.

   Let me know if you have any questions, otherwise it sure would be nice 
to roll this in if possible :)  Thanks,

-Troy


Changelog entry:

2003-01-06  Troy Curtiss <troyc@usa.net>

  * fhandler_serial.cc (fhandler_serial::tcsetattr):
      Add support and capability checking for B230400 bitrate
  * fhandler_serial.cc (fhandler_serial::tcgetattr):
      Add support for B230400 bitrate
  * /cvs/src/src/winsup/w32api/include/winbase.h:
      Add CBR_230400 definition for Win32 support of 230.4Kbps
  * /cvs/src/src/winsup/cygwin/include/sys/termios.h:
      Add B230400 definition for Posix support of 230.4Kbps 
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