CS444 hw1 Expected Behavior under testio.sh (grading script)

testio.sh (see other side) arranges via mtip to input 0123456789012345678901… at a slow rate, to testio.lnx, while running testio.lnx 

The little box shows where “hi!” is output in the original supplied hw1. The output shows before the kprintf of “write of 4 returned 4” because the supplied ttywrite code has used polling output to output the chars one by one.

Key:

italics: kprintf output, or other polling output

Plain text: output from interrupt-driven write

Underlined text: echoes from input to interrupt-driven reads

Bold text: echoes from input to polling reads

testio.sh <system number> OS-handled read, so interrupt-driven

… reboot output

Tutor> ~downloading testio.lnx “Tutor”, etc. is output using polling

.........Done. but “downloading…” is mtip/OS output

Download done, setting EIP to 100100.

Tutor> GO 100100

Running with console device TTY1 kprintf output from testio

                                     ioinit();

Trying simple write...               write(ldev,"hi!\n",4);

write of 4 returned 4                (write returns with all 4 chars still in queue)

<doing delay>

hi!                                  (output during delay loop)

Trying longer write                  write(ldev, "abcdefghi", 9)

abcwrite of 9 returned 9             (abc out, write returns with full queue, 6 chars)

<doing delay>                       

defghi                               (last queue-full output during delay loop)

Trying write of 80-char string...    got = write(ldev, buf, BUFLEN);

AABBCCDDEEFFGGHHIIJJKKLLMMNNOOPPQQRRSSTTUUVVWWXXYYZZ[[\\]]^^__``aabbccddee

write returned 80

<doing delay>                       

ffgghh012                            (finish output during delay loop, 012 input/echoed)

Type some input to test typeahead while looping for delay...  got = read(ldev, buf, 10);

<doing delay>

3456789                              (finish input, echo of requested 10 chars)

Got 10 chars into buf. Trying write of buf... write(ldev, buf, got);

0123

Trying another read right away... got = read(ldev, buf, 10);

4567890123456789

Got 10 chars on second read write(ldev, buf, got);

0123

Now turning echo off-- control(ldev, ECHOCONTROL, 0);

Type some input, note lack of echoes... got = read(ldev, buf, 20);

<doing delay>

456789____________________          (input of 012345678901234567890, no echoes)

Trying write of buf...              write(ldev, buf, got);

01234567890123

Asked for 20 characters; got 20

Exception 3 at EIP=00100110: Breakpoint

Tutor> ~q OS-handled read, so interrupt-driven

Quit handler: OS-handled write, so interrupt-driven

killing process 8291 Leaving board …

testio.sh, available in $cs444/hw1:

#!/bin/sh

# sapc.script used for hw1 grading

# Usage: testio.sh 5   to use system 5, etc.

# shell file to test hw1 through mtip

#  ~S for longer wait, ~s for shorter wait

#  use 20 secs for reset, then CR, then 1 sec, then ~d, 10 secs for download

mtip -b $1 -f testio.lnx << MRK

~r~S~S

~s~S~d~S~SGO 100100

~S~s0~s~s1~s~s2~s~s3~s~s4~s~s5~s~s6~s~s7~s~s8~s~s9~s~s0~s~s1~s~s2~s~s3~s~s4~s~s5~s~s6~s~s7~s~

s8~s~s9~s~s0~s~s1~s~s2~s~s3~s~s4~s~s5~s~s6~s~s7~s~s8~s~s9~s~s0~s~s1~s~s2~s~s3~s~s4~s~s5~s~s6~

s~s7~s~s8~s~s9~s~q

MRK

Dataflow in TTY driver: you add echo dataflow as shown in class

read ttyread : “program” code, dequeues from input Q

               input Q

         input interrupt handler: enqueues into input Q

 write ttywrite: “program” code, enqueues to output Q

               output Q echo Q

         output interrupt handler: dequeues from output Q