Leftovers: BSD
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BSD Mag: Understanding Unikernels by Russell Pavlicek
The number of tasks which lend themselves to being unikernels is larger than you might think. In 2015, Martin Lucina announced the successful creation of a “RAMP” stack. A variant of the common “LAMP” stack (Linux. Apache, MySQL, PHP/Python), the “RAMP” stack employs NGINX, MySQL, and PHP each built on Rumprun. Rumprun is an instance of a Rump kernel, which is a unikernel system based on the modular operating system functions found in the NetBSD project. So even this very common solution stack can be successfully converted into unikernels.
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Summary of the preliminary LLDB support project
Operating systems can be called monitors as they handle system calls from userland processes. A similar task is performed by debuggers as they implement monitors for traced applications and interpret various events that occurred in tracees and are messaged usually with signals to their tracers. During this month I have started a new Process Plugin within LLDB to incept NativeProcessNetBSD - copied from NativeProcessLinux - implementing basic functionality and handling all the needed events in the MonitorCallback() function. To achieve these tasks, I had to add a bunch of new ptrace(2) interfaces in the kernel to cover all that is required by LLDB monitors. The current Process Plugin for NetBSD is capable to start a process, catch all the needed events correctly and if applicable resume or step the process.
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NetBSD Making Progress On LLDB Debugger Support
NetBSD developers have been implementing the relevant interfaces needed for the LLVM debugger to effectively monitor and work on the operating system. As part of that they have also improved some of their own documentation, provided new ptrace interfaces, and more.
Those interested in LLDB and/or NetBSD can learn more about this debugging work via this NetBSD.org blog post.
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