FW: wrapper device driver

[Malte Vesper]

________________________________________
From: Malte Vesper
Sent: 02 February 2015 21:43
To: riya khanna
Subject: RE: wrapper device driver

Why don't you implement your wrapper as a userspace library?
________________________________________
From: kernelnewbies-bounces at kernelnewbies.org [kernelnewbies-bounces at kernelnewbies.org] on behalf of riya khanna [riyakhanna1983 at gmail.com]
Sent: 02 February 2015 21:24
To: kernelnewbies
Subject: wrapper device driver

Hi,

I'm writing a device driver to to provide a wrapper device around a
real device. Is it acceptable to do the following:

wrapper_dev_open(flags) {
   // do additional bookkeeping
   real_dev_filp = filp_open(real_device_node_path, flags);
}

wrapper_dev_mmap(mmap_parameters) {
   // do additional checks
   return real_dev_filp->f_op->mmap(mmap_parameters);
}

wrapper_dev_ioctl(ioctl_parameters) {
   // do additional checks
   return real_dev_filp->f_op->ioctl(ioctl_parameters);
}

Is it safe to do something like this? what would be the caveats? Given
a good use case, would the maintainers be willing to mainstream
something like this? Thanks!

-Riya

_______________________________________________
Kernelnewbies mailing list
Kernelnewbies at kernelnewbies.org
http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies