On Sat, Sep 25, 2010 at 11:50 PM, Bond <jamesbond.2k.g@xxxxxxxxx> wrote:
Read my post first. And see for yourself as to who cannot make out . These were the steps I told you to do.
1) insmod <MODULE.ko>
2) cat /proc/devices |grep <DEVICENAME> This will fetch you a number. Use it in step 3
3) mknod /dev/<DEVICENAME> c <Number from step 2> 0
4) echo -n "whatever" > /dev/<DEVICENAME>
5) cat /dev/<DEVICENAME>
Are these 5 steps so difficult for you to even reproduce. I think even a 1st grader can do this better than you.
It updates the file pointer.
On Sun, Sep 26, 2010 at 12:10 PM, Venkatram Tummala <venkatram867@xxxxxxxxx> wrote:
Yes, it is possible to pass in 0 for register_chrdev. Please be clear what you want to achieve, from your subject line & the post. The subject line & the first few lines of the post indicates thatThat is not my fault if you do not read the thread for one character even I was able to make it.
Read my post first. And see for yourself as to who cannot make out . These were the steps I told you to do.
1) insmod <MODULE.ko>
2) cat /proc/devices |grep <DEVICENAME> This will fetch you a number. Use it in step 3
3) mknod /dev/<DEVICENAME> c <Number from step 2> 0
4) echo -n "whatever" > /dev/<DEVICENAME>
5) cat /dev/<DEVICENAME>
Are these 5 steps so difficult for you to even reproduce. I think even a 1st grader can do this better than you.
Your code is giving me some erroryou need something which prints only the last character. And you go on creating a rucus around here.Who is creating rucus me or people giving me non sensical lecture to read malloc they hide their incompetency by giving lecture to Google.
I have updated the code & attached it. This can only read & write 10 characters. Now, please dont tell us that it is not you wanted or it doesn't work. Please spare us.
I did
Step 1) mknod /dev/bond c 0 0
Why & how the hell did you do this step before inserting the module. Do a cat /proc/devices|grep <DEVICENAME>. This will get you the number. Then do "mknod /dev/bond" c <NUMBER in /proc/devices> 0 . zero in register_chrdev(..) is not the device number. It indicates a dynamic number.
Step 2) chmod 666 /dev/bond
I didn't tell you to do this step.
Step 3) insmod bond.ko
Step 4) root@bond:~# lsmod | grep bond
bond 2031 0
Step5) echo -n abcde > /dev/bond
gives me error
bash: /dev/bond: No such device or address
Step 6) where as I can see ls -l /dev/bond
crw-rw-rw- 1 root root 0, 0 2010-09-26 12:14 /dev/bond
in your code you have done in memory_read
*f_pos = *f_pos + count;
why have you done this?
What purpose it serves?
It updates the file pointer.
