如果父进程没有对僵尸子进程进行wait操作，僵尸进程在内核空间留下的信息谁来清除

zhuhefang2006

The kernel keeps a small amount of information for every terminating process, so that the information is available when the parent of the terminating process calls wait or waitpid. Minimally, this information consists of the process ID, the termination status of the process, and the amount of CPU time taken by the process. The kernel can discard all the memory used by the process and close its open files.

如果父进程对僵尸进程进行wait，这些信息的清除（红色部分标识）是在执行wait过程中吗

如果没有进行wait，是父进程返回内核以后由内核代码清除的吗

alexhappy

init进程变成它们的父进程，所以是由它来清除的

zhuhefang2006

还准备问应该不会被init进程收养让init来清除呢
没想到楼上这么快就否定了我的想法 ：）

在apue有这么一段话
What normally happens is that whenever a process terminates, the kernel goes through all active processes to see whether the terminating process is the parent of any process that still exists. If so, the parent process ID of the surviving process is changed to be 1 (the process ID of init). This way, we're guaranteed that every process has a parent.

难道成为僵尸的子进程也属于any process that still exists？

cugb_cat

父进程退出后，子进程有init收养

eveson

原帖由 cugb_cat 于 2008-12-31 13:20 发表
父进程退出后，子进程有init收养

正解

zhuhefang2006

如果首先子进程成为了僵尸进程，然后父进程退出，僵尸子进程也由init收养？

samon_fu

在进程的父子关系上面是init进程收养。

cugb_cat

原帖由 zhuhefang2006 于 2009-1-3 14:03 发表
如果首先子进程成为了僵尸进程，然后父进程退出，僵尸子进程也由init收养？

是

cjaizss

那么僵尸将与父进程"共生死",父进程不挂,僵尸就不挂;父进程挂了,init收养僵尸并给它收尸