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Showing posts from March, 2019

Setting up a Windows VM for Kernel Debugging

If you search the web using the title of this post, you'll get many links to articles most of which explain how to set this up using a virtual COM port on the VM. Coming from driver background that goes back over 20 years, at first this seemed quite natural. But then I remembered that using WinDBG over COM port to be painfully slow. And recent adventures in OSX land using LLDB led me to wonder if WinDBG over network would to be possible? Well it turns out that WinDBG over Ethernet is indeed possible and is documented by Microsoft here . However, they miss out on certain key steps, which won't be obvious for the casual reader unless one reads the entire driver debugging documentation from the beginning. This post captures all the requisite steps as a quick reference guide. I used one of the freely available MSEdge on Windows 10 VM for   VirtualBox . It's only valid for 90 days, but 90 days was more than enough for my little excursion into the driver land. If you want a

Javascript Promises

While explaining Promises to a friend I remembered reading a blog post couple of years back that explained the concept very well and made it all clear to me. However, I never bookmarked and searching for it, I can't find the specific post. Then I thought why not recreate some of the samples that the blog author had used to explain the concepts. Here's what I came up with: // Function to convert setTimeout into a Promise based // abstraction function delaySeconds(seconds) { return new Promise((resolve, reject) => { setTimeout(resolve, seconds*1000); }); } /* * A simple function that converts clunky setTimeout * callback based interface to a promise based * abstraction. */ function delayAndReturn(seconds, retval) { return new Promise((resolve, reject) => { setTimeout(() => { resolve(retval); }, seconds*1000); }); } // example of how to use the above abstraction console.log("Calling delaySeconds with 10 seconds delay&q