linux28学习 进程结束演示

signal.c++

#include <stdio.h>
#include <signal.h>
#include<unistd.h>
void handler(int sig)
{   printf("catch a sig : %d\n", sig);
}
int main()
{   while(1){sleep(1);printf("进程号：%d\n",getpid());}return 0;
}

 mykill.c++

 

#include<iostream>
#include<string>
#include<unistd.h>
#include<signal.h>
#include<sys/types.h>static void usage(const std::string& prog)
{std::cerr << "Usage: " << prog << " <pid>" << std::endl;exit(1);
}int main(int argc, char* argv[])
{if(argc != 3)usage(argv[0]);pid_t pid = std::stoi(argv[1]);int signal = std::stoi(argv[2]);if(pid <= 0)usage(argv[0]);std::cout << "kill " << pid << std::endl;int n =kill(pid, signal);if(n!=0){std::cerr << "kill failed" << std::endl;exit(1);}return 0;
}