fork() 系统调用可以创建进程。然后查看进程ID和父进程ID使用getpid()和getppid()函数.

使用C语言描述:

#include 
     
      #include 
      
       int main (int argc, char *argv[]){    pid_t child = -1;        if ((child = fork()) == 0) {        fprintf(stderr, "1: child pid is %u\n", getpid());        fprintf(stderr, "2: his parent is %u\n", getppid());    } else {        fprintf(stderr, "3: parent pid is %u\n", getpid());    }    return 0;}
      
     

运行结果: