The TTY layer
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tty layer - Exercise
The point of this exercise is to write a memory-based tty_driver. The
hardware output should be provided by a memory buffer. Therefore the driver
write() function that sends the user data on the output port should copy the
data on this buffer. A timer can be used to emulate a delay in the transmission
of the data. In a real situation there would be an interrupt raised by the
hardware when data arrive, and the timer tasklet would push the data to the line
disipline, so that they can be delivered to the user read() function.
[more description of the example]
You can now experiment changing the device settings and observing how
changes the call to the read/write functions. For example, by turning ECHO on,
the line discipline will echo all the characters from the flip buffer to the
write() function.
Code: href="http://www.geocities.com/marco_corvi/games/lkpe/tty/mem_tty.c">mem_tty.c,
memeory-based tty driver; href="http://www.geocities.com/marco_corvi/games/lkpe/tty/mem_read.c">mem_read.c,
tty driver read test; href="http://www.geocities.com/marco_corvi/games/lkpe/tty/mem_write.c">mem_write.c,
tty driver write test; href="http://www.geocities.com/marco_corvi/games/lkpe/tty/Makefile.txt">Makefile,
tty driver write test;Marco Corvi -
2003
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