CS 100 - signals - hw3

Features

This is a C++ program properly handle

1. the cd command: cd , cd, cd -
2. prompt displays the current working dir
3. ^C
4. ^Z, fg, bg
5. home folder to "~"

Folders

signals.script is in tests folder.

How to use

Run the following commands

$ git clone https://github.com/Renee7547/rshell.git
$ cd rshell
$ git checkout hw3
$ make
$ bin/rshell

Test cases

They are in rshell/tests

Issues

1. In real bash, we run "cat", "^Z", "bg", "pwd"(any command) in order, the "pwd"(any cmd) run without "cat" running; But in my program, "cat" and "pwd"(any command) run at the same time.

Bugs have been solved

1. when multiple processes were sent to the background, we should use "fg" to run them one by one. So we should reserve the pid(s) to a list, and the stoped pid(s) to another list.
2. when "bg" was used, I could still run "^C" and "^Z" to modify the bg process, while they are not supposed to influence the background process. So I ignore SIGINT and SIGTSTP in child process.