Lab 2 Design Doc

Overview

In-depth Analysis and Implementation

fork (EXAMPLE):

• A new process needs to be created through kernel/proc.c:proc_init
• Parent must copy its memory to the child via kernel/mm/vm.c:as_copy_as
• All the opened files must be duplicated in the new process (make sure to call fs_reopen_file)
• Create a new thread to run the process and add new process to process table (see example in proc_spawn)
• Duplicate current thread (parent process)’s trapframe in the new thread (child process) (recall that assigning one struct to another results in a copy)
• Set up trapframe to return 0 in the child via kernel/trap.c:tf_set_return, while returning the child’s pid in the parent

Risk Analysis