Windows System Software -- Consulting, Training, Development -- Unique Expertise, Guaranteed Results


Before Posting...

Please check out the Community Guidelines in the Announcements and Administration Category.

More Info on Driver Writing and Debugging

The free OSR Learning Library has more than 50 articles on a wide variety of topics about writing and debugging device drivers and Minifilters. From introductory level to advanced. All the articles have been recently reviewed and updated, and are written using the clear and definitive style you've come to expect from OSR over the years.

Check out The OSR Learning Library at:

Best practice for running I/O operations from a minifilter

LeHackermanLeHackerman Member Posts: 12

I am writing a minifilter to log all the operations happening on the filesystem. To do so, I'm planning on writing the logs to a serial port which outputs to a file on my host machine (The minifilter is planned to run on a VM). I read on the forum that when using KMDF it's better to use the Wdfioxxx APIs rather than the Zwxxx APIs to avoid failures when running on IRQL>PASSIVE_LEVEL. So, I wanted to ask, does the same idea apply for minifilters or can I use the Zwxxx APIs with no risk ?


Sign In or Register to comment.

Howdy, Stranger!

It looks like you're new here. Sign in or register to get started.

Upcoming OSR Seminars
OSR has suspended in-person seminars due to the Covid-19 outbreak. But, don't miss your training! Attend via the internet instead!
Kernel Debugging 16-20 October 2023 Live, Online
Developing Minifilters 13-17 November 2023 Live, Online
Internals & Software Drivers 4-8 Dec 2023 Live, Online
Writing WDF Drivers 10-14 July 2023 Live, Online