On Tue, Jul 5, 2011 at 9:15 AM, Bond <jamesbond.2k.g@xxxxxxxxx> wrote:
This is an interview question.
I had written device driver for a char device so I know that code
structure looks like this
struct file_operations something {
.owner=my_device_open;
.read=my_device_read;
.close=my_device_close;
.write=my_device_write;
}
When the device driver is active then in
/dev/mydevice
you can actually read and write into it. But what I was not clear is
how an application will read or write to this device. I know insmod
will insert the module to kernel,and register_chrdev(); will register
the driver in kernel but how will application program communicate with
this driver.
My answer was
In unix it simply opens the device node as a file and sends/receives
data and commands from it.
But he was expecting some thing more complex.
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Hi,
Not in touch with low level stuff for some time but do check ioctl() and sysfs on wikipedia or man pages.
Take care.
--
Shahbaz Khan
R&D Engineer,
Tactical Engineering and Consultancy.
http://shazkhan.wordpress.com/
http://pk.linkedin.com/pub/shahbaz-khan/20/116/b49
http://imsciences.edu.pk/serg/
http://csrdu.org/
+92-91-332-9915828
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