In a multi-tasking operating system, each CPU (or CPU core) can work on one process at a single point in time. The parent, which is signalled awake when the child exits, cleans the remaining structure and continues with executing its own program code. ![]() On exiting, the child process closes or discards its resources and environment the remainder is referred to as a zombie. ![]() Normally, a parent process sleeps while the child process runs, setting a request (wait) to be signalled when the child process completes. A child process may then execute its own program code. Through the for routine, a child process inherits security identities, the previous and current file descriptors, port and resource privileges, environment variables and program code. All processes are descendants of the first system process, which is systemd in the case of the Red Hat Enterprise Linux 7 system. Any process may create its own child process. ![]() The PID and parent process (PPID) are elements of a new process environment. Every new process has a unique process ID (PID) for tracking and for security. Allocated system resources, such as file descriptors and network portsĪn existing process duplicates its own address space (fork) to create a new (child) process structure.
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