hi there,

I am a newbie in Linux kernel and I have a Debian 2.6.4 installed. I have compiled hello.c module, and I can install and uninstall the driver. I then create a simple character driver. I can compile it, load the module and remove the module and I can see the debug message using printk. I can write to the module using echo and then read it using cat. The problem is that open, release, read, and write functions are not called. I cannot see any debug message from these functions. Any pointer? Thanks in advance.

Xinren

i too have the same problem if you have any soultions pls to let me know

i believe u have mapped them properly in struct file operations
also do the following
# mknod node c major no minor no(wen u dmesg u get these major and minor no)
..........make an application like app.c and call read and write in it
then compile the application gc app.c
# ./a.out node ...........
it will work