linux主进程退出时，结束子进程

主进程创建p1, p2两个进程，在主进程结束同时也让子进程结束！

#include 
#include 
#include 
#include 
#include 
#include 

pid_t p1, p2;

void my_handler(int s){
  switch(s){
  case SIGINT:
    printf("caught:%dn", s);
    exit(1);
    break;
  case SIGTERM:
    printf("caught:%dn", s);
    kill(p1, 9);
    kill(p2, 9);
    waitpid(p1, NULL, 0);
    waitpid(p2, NULL, 0);
    exit(1);
    break;
  }
}

int main(){
  struct sigaction sigHandler;
  sigHandler.sa_handler = my_handler;
  sigemptyset(&sigHandler.sa_mask);
  sigHandler.sa_flags = 0;

//捕获ctrl+c信号
  sigaction(SIGINT, &sigHandler, NULL);
  //捕获kill pid信号
  sigaction(SIGTERM, &sigHandler, NULL);


  //  pid_t p1, p2;

  if((p1 = fork()) == 0){
  //进程1
    while(1){
      printf("%dn", getpid());
      sleep(3);
    }
  }else if((p2 = fork()) == 0){
  //进程2
    while(1){
      printf("%dn", getpid());
      sleep(3);
    }

  }
  //主进程
  while(1){
    printf("hello %d n", getpid());
    sleep(2);
  }
  
  return 0;
}

注意：此方式在kill 子进程的时候，主进程也同时结束了！！！