close
root@debian60:~/exercise# cd chardev
root@debian60:~/exercise/chardev# vi chardev.c
root@debian60:~/exercise/chardev# make -C /lib/modules/2.6.32/build M=`pwd` modules
make: Entering directory `/usr/src/linux-source-2.6.32'
CC [M] /root/exercise/chardev/chardev.o
Building modules, stage 2.
MODPOST 1 modules
CC /root/exercise/chardev/chardev.mod.o
LD [M] /root/exercise/chardev/chardev.ko
make: Leaving directory `/usr/src/linux-source-2.6.32'
root@debian60:~/exercise/chardev# rmmod chardev
root@debian60:~/exercise/chardev# insmod ./chardev.ko
root@debian60:~/exercise/chardev# cd test/
root@debian60:~/exercise/chardev/test# ls
Makefile test.c
root@debian60:~/exercise/chardev/test# vi test.c
root@debian60:~/exercise/chardev/test# make
gcc test.c -o test
test.c: In function ‘main’:
test.c:15: warning: incompatible implicit declaration of built-in function ‘printf’
test.c:16: warning: incompatible implicit declaration of built-in function ‘exit’
test.c:22: warning: incompatible implicit declaration of built-in function ‘printf’
test.c:23: warning: incompatible implicit declaration of built-in function ‘exit’
test.c:26: warning: incompatible implicit declaration of built-in function ‘printf’
root@debian60:~/exercise/chardev/test# vi test.c
root@debian60:~/exercise/chardev/test# vi test.c
root@debian60:~/exercise/chardev/test# make
gcc test.c -o test
root@debian60:~/exercise/chardev/test# cat /proc/devices
Character devices:
1 mem
4 /dev/vc/0
4 tty
5 /dev/tty
5 /dev/console
5 /dev/ptmx
7 vcs
10 misc
13 input
14 sound/midi
14 sound/dmmidi
21 sg
29 fb
116 alsa
128 ptm
136 pts
180 usb
189 usb_device
252 chardev
253 bsg
254 rtc
Block devices:
2 fd
259 blkext
7 loop
8 sd
11 sr
65 sd
66 sd
67 sd
68 sd
69 sd
70 sd
71 sd
128 sd
129 sd
130 sd
131 sd
132 sd
133 sd
134 sd
135 sd
root@debian60:~/exercise/chardev/test# mknod /dev/hello c 252
mknod: missing operand after `252'
Try `mknod --help' for more information.
root@debian60:~/exercise/chardev/test# mknod /dev/hello c 252 0
root@debian60:~/exercise/chardev/test# cat /dev/hello
I already told you 0 times hello world
root@debian60:~/exercise/chardev/test# echo "hi niki" > /dev/hello
-bash: echo: write error: Invalid argument
root@debian60:~/exercise/chardev/test#
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