父进程等待子进程退出

先会运行子进程 检测到了exit(3)返回参数3
再运行父进程
子进程会变成僵尸进程

#include<stdio.h>
#include<sys/types.h>
#include<unistd.h>
#include<stdlib.h>
int main(){
    
    
        pid_t pid;
        int cnt = 0;
        int status = 10;
        pid = fork();
        if(pid > 0){
    
    
                wait(&status);//返回exit(3)的参数
                printf("child quit,child staus = %d\n",WEXITSTATUS(status));
                while(1){
    
    
                        printf("cnt = %d\n",cnt);
                        printf("father pid = %d\n",getpid());
                        sleep(1);
                }

        }else if(pid == 0){
    
    
                while(1){
    
    
                        printf("child pid = %d\n",getpid());
                        sleep(1);
                        cnt++;
                        if(cnt == 3){
    
    
                                exit(3);
                        }
                }
        }
}