The difference between clone and fork

Fork () is all replication vfork () is a shared memory clone () is a parent process resource that can be selectively copied to a child process, and the data structure that is not replicated is shared by the child process through the replication of the pointer, specifically what resources are copied to the child process, as determined by the clone_flags in the parameter list. In addition, clone () returns the PID of the child process.

Clone is an upgraded version of fork that not only creates a process or thread, but also specifies the creation of a new namespace (namespace), a selective memory that inherits the parent process, or even a sibling process that can turn the created process into a parent process, and so on.