linux - Zombie vs Defunct 进程？

Question

僵尸进程和死进程有区别吗？我找到了维基百科文章，其中写道这两个是相同的。在那种情况下，为什么需要为同一过程设置 2 个不同的术语:

https://en.wikipedia.org/wiki/Zombie_process

Answer 1

对于 Linux，“defunct”和“zombie”进程是一样的。

来自 man ps :

Processes marked <defunct> are dead processes (so-called "zombies") that remain because their parent has not destroyed them properly. These processes will be destroyed by init(8) if the parent process exits.

PROCESS STATE CODES
    Here are the different values that the s, stat and state output specifiers (header "STAT" or "S") will display to describe the state of a process:
    D    uninterruptible sleep (usually IO)
    R    running or runnable (on run queue)
    S    interruptible sleep (waiting for an event to complete)
    T    stopped by job control signal
    t    stopped by debugger during the tracing
    W    paging (not valid since the 2.6.xx kernel)
    X    dead (should never be seen)
    Z    defunct ("zombie") process, terminated but not reaped by its parent