僵尸进程(Zombie process)通俗来说指那些虽然已经终止的进程，但仍然保留一些信息，等待其父进程为其收尸。也就是说父进程没有结束，但是子进程结束了，父进程没死，没办法给子进程收尸，真的是只有父进程死了才能收尸，哈哈，同时也没有显示的调用wait/waitpid给其子进程收尸。当然，父进程提前死亡，子进程会交给init进程，所以收尸的问题就交给init进程了。
一，在linux下生成一个僵尸进程的c代码
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <signal.h>
#include <linux/wait.h>
int main(int argc,char **argv)
{
int i=0;
pid_t pid=fork();
if(pid==-1) return 0;
else if(pid==0)
{
printf("son pid is %dn",getpid());
while(1)
{
printf("son---i=%dn",i);
i++;
sleep(1);
if(i==5)
break;
}
printf("son is over!n");
}else if(pid>0)
{
printf("parent pid is %dn",getpid());
while(1) sleep(100);
}
return 0;
}
这样就是在子进程已经结束，但是父进程永远也不会结束，也没有调用wait/waitpid。那么子进程就成为僵尸进程。
编译，gcc makeDefunct.c -o makeDefunct
我的文件名是makeDefunct.c 运行./makeDefunct
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二、如何查看僵尸进程
可以利用top命令，效果如下，上文中创建的僵尸进程
可以发现我的服务器下只有一个僵尸进程。
也可以用 ps -aux |grep Z 来查看僵尸进程，效果如下：
僵尸进程的状态显示的是Z
三、如何杀死僵尸进程
从僵尸进程的概念可以看出，父进程没有结束导致的，我们把父进程杀死，父进程就会寻找他自己创建的子进程，从而杀死僵尸进程。所以我们要杀死父进程就可以。所以第一步要找到父进程 ps -ef | grep defunct_process_pid（僵尸进程pid） 然后执行，kill -s 9 父进程的pid。演示如下：
可以看出，先找到僵尸进程的pid，我这里使用ps -aux |grep make 是因为我的c文件是make开头的。然后在找到僵尸进程的父进程的pid 11781
然后杀死 kill -s 9 11781
检查一下是否杀死了僵尸进程
执行top后得到的结果如下图：
没有僵尸进程了已经被杀死了。
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