ubuntu上进程生成并且调用子进程执行不同的任务

#include <sys/types.h>
main()
{
        pid_t pid;
        printf("\n[%d]not fork pid=%d\n",getpid(),pid);
        pid=fork();
        printf("\n[%d]forked pid=%d\n",getpid(),pid);
        if(pid<0)
        {
                printf("error in fork!\n");
                getchar();
                exit(1);
        }
        else if(pid==0)
                printf("\n[%d]in child process,p_id=%d\n",getpid(),getpid());
        else
        {
                printf("\n[%d]in parent process,my pid=%d\n",getpid(),pid);
                printf("\n[%d]in parent process,my getpid=%d\n",getpid(),getpid());

        }
}