Sysctl

Дерево переменных
 * kern: High kernel, proc, limits &c
 * vm: Virtual memory
 * net: Network, (see socket.h)
 * debug: Debugging
 * hw: hardware
 * machdep: machine dependent
 * user: user-level
 * p1003_1b: p1003_1b, (see p1003_1b.h) - POSIX message queues (?)
 * security: Security
 * compat: Compatibility code
 * dev