Parent Faults before fork()

Question Text

What causes the page faults that occur between the first and second steps?

Question Answers

• Calling fork() duplicates the pages previously allocated by the parent

• Demand paging makes the pages in the p array to be mapped to frames only when written

• The OS duplicates the parent’s pages in preparation for fork()

• mmap() sets the pages to be mapped at a later time, decided by the OS