如何杀死一个进程，其PID不断变化？ [英] How to kill a process whose pid keeps changing?

问题描述

我知道我可以使用的伎俩如果（叉（））​​出口（0）; 来改变当前进程的PID。所以，下面的程序将有一个PID变化非常快。如何杀死这样一个过程？有一些不是执行了很多 killall PROCNAME ，直到一赠能跑杀（）更好的方法之前它叉？我知道这是不是一个'过程'，但是，对于一个几微秒运行多个进程的每个

I know I can use the trick if (fork()) exit(0); to change the pid of the current process. So, the following program would have a pid changing very quickly. How to kill a process like this? Is there some better method than executing a lot of killall procname until one get able to run kill() before it forks? I know it is not a 'process', but many processes that run for a few microseconds each.

#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>

int main()
{
    pid_t self = getpid();
    while (1)
    {
        if (fork()) exit(0);
        if (self + 10000 < getpid()) break; // Just to kill it after some time
        usleep(1000);
    }
    return 0;
}

此外，我发现列出进程执行的唯一途径 PS -A | grep的PROCNAME 几次，直到有表现出一定的输出。为什么没有这个过程始终上市？

Also the only way I found to list the process was executing ps -A | grep procname a few times until one showed some output. Why isn't the process always listed?

推荐答案

这样的方法是由系统管理员称为彗星

Such a process is called a "comet" by systems administrators.

进程组ID（PGID）不会改变叉子，这样你就可以通过发送信号到进程组杀它（或 SIGSTOP 吧）（您传递否定PGID，而不是一个PID为杀）。

The process group ID (PGID) doesn't change on fork, so you can kill it (or SIGSTOP it) by sending a signal to the process group (you pass a negated PGID instead of a PID to kill).

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