Hi Lokesh On Wed, Nov 12, 2014 at 6:42 PM, lokesh kumar <lokeshkumar.222@gmail.com> wrote:
Hi,
I have a question regarding open systemcall
"open(dev_name, O_RDWR, 0)" -->userspace
suppose devname is /dev/my_device
Now when we look into open file operation, we have prototype "int (*open) (struct inode *, struct file *);"
could anyone tell me how inode and file structure pointer are filled.
I think logic is written in fs/open.c
but i got confused in callbacks used in it.could anyone please tell me which topics should i cover to understand open system call.
You should probably first understand how the file is located. See the role of lookup.
Thanks.
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