The POSIX-compatibility component of VM/CMS (OpenExtensions) provides a very limited implementation of fork, in which the parent is suspended while the child executes, and the child and the parent share the same address space.
VM/CMS（OpenExtensions）的POSIX兼容组件提供了一个非常有限的fork实现，其中的父进程在子进程执行时被暂停，并且子与父共享同一地址空间。