如何在c++中用kill函数杀死一个进程

Question

我正在Linux中学习流程。我需要编写一个操作流程(创建、终止、更改细节和挂起(的任务。我已经写了那个程序，但kill和suspend不起作用。为了修复这个问题，我以超级用户的身份启动了那个程序，但这对我没有帮助。我需要做什么来修复这个错误？

#include <iostream>
#include <sys/types.h>
#include <sys/wait.h>
#include <cstring>
#include <unistd.h>
#include <sys/resource.h>
using namespace std;
int main(){
float l,r;
//  system("gnome-terminal -e 'sh -c " /home/neo/Desktop/OSLab8/childprocess/a.out 1 2 3"'");
cout<<"Enter left and right side of the loopn";
cin>>l>>r;
int n;
cout<<"Enter number of processesn";
cin>>n;
//   cout<<"Process 0";
int currentPid;
string cmd;
double s = l;
double step = (r-l)/n;
cout<<"Father id "<<getpid()<<endl;
int mode;
cout<<"Enter 1 to time measure mode, 2 - demo moden";
cin>>mode;
for(int i=0;i<n;i++) // loop will run n times (n=5)
{
switch(currentPid = fork()){
case 0:
cmd = "gnome-terminal -e 'sh -c " /home/neo/Desktop/OSLab8/childprocess/a.out "+to_string(s)+" "+to_string(s+step)+" "+((mode==1)?"":"1 ")+""'";
system(cmd.c_str());
return 0;
case -1:
printf("Error when forkingn");
break;
default:
break;
}
cout<<"Son process id - "<<currentPid<<endl;
s+=step;
}
if(mode==1){}
else{
int choise;
do{
cout<<"1 Set priority of processes "<<endl;
cout<<"2 Kill processes "<<endl;
cout<<"3 Suspend:"<<endl;
cout<<"4 Exit";
cout<<"Your command: ";
cin>>choise;
switch(choise)
{
case 1:
{
cout << "Enter ID of the process: ";
int id; cin >> id;
cout << "Enter the priority (from -20 up to 19): ";
int prior; cin >> prior;
setpriority(PRIO_PROCESS,id,prior);
break;
}
case 2: 
{
cout << "Enter ID of the process: ";
pid_t id; cin >> id;
kill(id,9);
break;
}
case 3: 
{
cout << "Enter ID of the process: ";
int id; cin >> id;
kill(id,SIGSTOP);
break;
}
case 4: 
{
cout << "Enter ID of the process: ";
int id; cin >> id;
kill(id,SIGCONT);
break;
}
}
}while(choise!=4);
}
}

Answer 1

我消除了不相关的"东西"；并提出了这个：

#include <iostream>
#include <sys/types.h>
#include <sys/wait.h>
#include <cstring>
#include <unistd.h>
#include <sys/resource.h>
#include <stdlib.h>
#include <string>
int main(int argc, char **argv) {
if (argc != 2) { 
std::cerr << "Usage: kil <process IDn";
return EXIT_FAILURE;
}
pid_t process = std::stoi(argv[1]);
if (kill(process, 9)) {
std::cerr << strerror(errno) << 'n';
return EXIT_FAILURE;
}
}

我做了一个快速测试，扼杀了几个过程，它似乎工作正常。如果你想进一步扼杀这个过程。。。您可能需要使用kill(process, SIGINT)。