Added FIFO for old kernel task

[LevchenkoDmitry]

Решение заключается в том, что просто создаем очередь, в которую помещаем по одной строке.

[AblakatovMikhail]

Драйвер вмещает слишком мало сообщений. Возможно, это связано с размером буфера? Можно ли сделать его динамическим?

Запись:

# for i in  $(seq 1 1024) ; do echo "Message $i with some additional text to inc
rease its size" > /dev/dummy ; done
[  104.926591] [OPENING] It has been opened 1 times
[  104.927446] [CLOSING] It has been closed 1 times
[  104.927874] [OPENING] It has been opened 2 times
[  104.928234] [CLOSING] It has been closed 2 times
[  104.928620] [OPENING] It has been opened 3 times





^C[  127.386324] [CLOSING] It has been closed 3 times

# for i in  $(seq 1 8) ; do echo "Message $i with some additional text to increa
se its size" > /dev/dummy ; done
[  136.539992] [OPENING] It has been opened 4 times


^C[  154.797660] [CLOSING] It has been closed 4 times

Чтение:

# while (true) ; do read_msg=$(cat /dev/dummy) ; if [ -z $read_msg ] ; then brea
k ; fi ; echo $read_msg ; done
[  349.362942] [OPENING] It has been opened 5 times
[  349.387248] [CLOSING] It has been closed 5 times
sh: 1: unknown operand
Message 1 with some additional text to increase its size Message 2 with some additional text to increase its size Message 3 with
[  349.410893] [OPENING] It has been opened 6 times
[  349.411277] [CLOSING] It has been closed 6 times