Overview

The goal of this assignment is to…

In-depth analysis and implementation

fork (EXAMPLE):

• A new process needs to be created through kernel/proc.c:proc_init.

• The parent must copy its memory to the child via kernel/mm/vm.c:as_copy_as.

• All opened files must be duplicated in the new process (make sure to call fs_reopen_file).

• A new thread needs to be created to run the process, and a new process needs to be added to the process table (see the example in proc_spawn).

• The current thread (parent’s process)’s trapframe needs to be duplicated in the new thread (child process). (Recall that assigning one struct to another results in a copy.)

• The call to fork() has two different return values; the trapframe needs to be set up to return 0 in the child via kernel/trap.c:tf_set_return, while returning the child’s pid in the parent.

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Risk analysis

Unanswered questions

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Staging of work

We plan to implement the work in this lab as follows:

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Time estimation

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