如何产生10个僵尸进程

#include<stdio.h>
#include<stdlib.h>
#include<unistd.h>
#include<string.h>

int main(void)
{
pid_t child;
int i;
for(i = 0;i < 10;i++)
{     
        child = fork();
        if(child > 0)
        {
//            wait(NULL);
while(1)
{
    setsid();
    printf("this is comzes=[%d]\n",getppid());
    sleep(1);
}
        }else if(child == 0)
        {
printf("this is child=[%d]\n",getpid());
exit(-1);
    }   

}
return 0;

}
求指教。。