I needed to add a custom System Request (Sys Req or SysRq) to a linux kernel some time ago. While doing so, I dug deep into how it works and I thought I’d make a quick post about it. Here is a good SuperUser answer about what a SysRq is. You may also know about SysRq via REISUB. This post has three parts: how to raise a SysRq, how SysRq works (looking into kernel code), and how to add your own SysRq.
    • jet@hackertalks.comEnglish
      7·
      2 years ago

      https://lwn.net/Articles/296738/

      Unix internals is a great book! If you haven’t had an occasion to read it, I can’t recommend it highly enough. Similar to design of the BSD operating system, it goes into the internal data structures, but most importantly the rationale

        • jet@hackertalks.comEnglish
          4·
          2 years ago

          The design of the BSD operating system is more narrative friendly, easier to read just for fun

          Unix internals keeps getting updates, but is far more technically applied. And probably easier to become outdated.

          From a philosophy perspective both books are great but if you could only read one I would recommend the BSD book. I know the Linux kernel and the BSD kernel have divergent development, but as far as posix structures are concerned they’re pretty similar

            • A Basil Plant@lemmy.world
              4·
              2 years ago

              Operating Systems: Three Easy Pieces by Remzi H. Arpaci-Dusseau & Andrea C. Arpaci-Dusseau (University of Wisconsin-Madison) is an excellent book and used by many universities worldwide. Extremely well written and it’s one of the only textbooks I’ve ever completed from start to end.

              It’s also completely free: https://pages.cs.wisc.edu/~remzi/OSTEP/

                • jet@hackertalks.comEnglish
                  3·
                  2 years ago

                  100% I’m in the same boat.

                  I looked into various print on demand services with binding, but they always were more hassle than just printing everything at home

            • jet@hackertalks.comEnglish
              3·
              2 years ago

              Yes that’s the book, though I read a older version initially.

              I haven’t read the free BSD version, I wonder if there’s a Linux version? That would be interesting too

            • UlrikHD@programming.devEnglish
              5·
              2 years ago

              Please refrain from harassing our users, keep whatever argument you have contained to the thread it started. Following and harassing users across communities/instances is not tolerated.

              You will only be given a temporary ban of one week from our instance, but if it continues after that it will changed to a permanent ban.