进程链进程扇

进程链
#include <stdio.h>
#include <sys/types.h>
#include <unistd.h>

int main(void)
{
    pid_t pid;
    int i;
    //printf("pid = %d\n",getpid());
    for(i = 0; i< 5;i++ ){
        pid = fork();
        if(0 == pid){
            printf("child pid = %d\n",getpid());
        }else if(pid > 0){
            break;
        }else{
            printf("error\n");
        }
    }
    printf("pid = %d,ppid = %d\n",getpid(),getppid());
    sleep(3);
    return 0;
}

进程扇
int main(void)
{
    pid_t pid;
    int i;
    //printf("pid = %d\n",getpid());
    for(i = 0; i< 5;i++ ){
        pid = fork();
        if(0 == pid){
            break;//子进程退出循环
        }else if(pid > 0){
            printf("father pid = %d\n",getpid());
        }else{
            printf("error\n");
        }
    }
    printf("pid = %d,ppid = %d\n",getpid(),getppid());
    sleep(3);
    return 0;
}