APIs get removed from Linux all the time. Off the top of my head, here's one: https://man7.org/linux/man-pages/man2/sysctl.2.html https://man7.org/linux/man-pag

APIs get removed from Linux all the time. Off the top of my head, here's one: https://man7.org/linux/man-pages/man2/sysctl.2.html https://man7.org/linux/man-pages/man2/sysctl.2.html > This system call no longer exists on current kernels! See NOTES.