________________________________________
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@xxxxxxxxxxxxxxxxx [kernelnewbies-bounces@xxxxxxxxxxxxxxxxx] on behalf of riya khanna [riyakhanna1983@xxxxxxxxx]
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
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