Question

1. Describe the differences between a child process, an orphaned process, and a zombie process. Who adopts an orphaned process? ( no copy right)

Answer 1

A child process in computing is a process created by another process (the parent process). This technique pertains to multitasking operating systems, and is sometimes called a subprocess or traditionally a subtask.

The orphan process is one whose parent process has been terminated however child process is still running. In Linux, for any process whose parent is dead re-parenting happens and the child gets adopted by init(PID = 1) process however its state is still shown as an orphan as original parent process is dead.

A zombie process or defunct process is a process that has completed execution but still has an entry in the process table.

An orphan process is a computer process whose parent process has finished or terminated, though it remains running itself. In a Unix-like operating system any orphaned process will be immediately adopted by the special init system process. This operation is called re-parenting and occurs automatically.