3.5 When a process creates a new process using the fork() operation, which of the following state is shared between the parent process and the child process?

　　a. Stack　　b.Heap　　c.Shared memory segments

答案:c.Shared memory segments.

解析：fork一个新的子进程时， 子进程会得到和父进程用户级虚拟地址空间相同的一份拷贝， 包括文本， 数据和bss段， 堆以及用户栈。 所以他们只有shared memory segments 会在他们之间共享。