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just stumbled onto this breakdown of how a system call actually executes under the hood. it uses a tiny c snippet that runs

clock_gettime()

three times and then writes five bytes to stdout to demonstrate the process. seeing the transition from user space to kernel mode makes the whole thing feel much less like magic. it is pretty wild how much work happens just to output a few characters. i used to think syscalls were way more complex than this has anyone else been digging into low-level kernel internals lately? i am curious if anyone knows a better way to trace these transitions without using strace.

article: https://www.freecodecamp.org/news/how-a-system-call-actually-works-in-linux/