linux下用c语言创建进程树答:int main(void) { int p,p11,p12,p13,p21,p22;while ((p=fork())==-1);if (!p) { printf("Parent with pid %d, parent pid %d.\n",getpid(),getppid());while ((p11=fork())==-1);if (!p11) { printf("child11 with pid %d, parent pid %d.\n",getpid(),getppid())...