Fork如何使用PID杀死进程 [英] Fork How to Kill A process with PID

问题描述

我只需要使用c ++运行一个二进制文件并杀死它.

Hi all I have to run a binary file using c++ and kill it.

我的代码看起来像

static int PROCESS_PID=0;

void startService(bool startservice){

if(startservice==true){
 pid_t PID = fork();
 if(PID == 0) {
   PROCESS_PID = getpid();
   printf("the child's pid is: %d\n", PROCESS_PID);
   system("./process");
 }
}

else{
 kill(PROCESS_PID, SIGUSR1); //kill process inside child process
 }

}

但是当我终止进程时，整个程序都会退出.任何想法 ?我的代码有什么问题吗?

But when I kill the process the entire program get exited. Any Idea ? Is there anything wrong with my code ?

谢谢....

推荐答案

当您调用 system()时，您将启动第三进程-您没有pid的进程.改用 exec().

When you call system() you are starting a third process -- one which you do not have the pid for. Use exec() instead.

不过，更糟糕的是，仅在 startservice！= true 的情况下进行您的 kill()调用，在这种情况下，此调用 PROCESS_PID == 0 ...所以您要杀死进程0(它将信号发送到当前进程组中的所有进程).

Worse though, your kill() call is only made in the case that startservice!=true, and in this case PROCESS_PID==0... so you're killing process 0 (which will send the signal to all processes in your current process group).

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