On Tue, Feb 11, 2025 at 2:00 AM Kian Karas (KK) <k...@thrane.eu> wrote:
> Hi community > > I have a question related to the implementation of poll() in the kernel > and drivers. I am implementing a driver with poll support (through > file_operations::poll) and have observed that "teardown" of the pollfds is > not performed if the task is killed (while task is blocked on a call to > poll()). Is this intended behavior? > > it's impossible to recover reliably before file reference count( https://github.com/apache/nuttx/pull/13296) is implemented. > As file_operations::close is called it seems possible to find and remove > the FD, but I cannot find any driver doing that. This patch was merged recently, that's why you can't find the driver handle close with active poll spreadly. > Since close is actually called on the driver, I would assume the intention > is to clean up the driver, but I find it a little inconsistent that > cleaning up the pollfds does not happen. > > Yes, https://github.com/apache/nuttx/pull/15809 is an example demo on how to handle close with the active poll correctly. > I am using the "flat" build configuration. The beavior may be different in > "protected" builds? > > Regards > Kian >
