tg-rcore-tutorial-user 0.4.10

User-space apps for rCore Tutorial chapters (subset for ch2).
Documentation 
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#![no_std]
#![no_main]

#[macro_use]
extern crate user_lib;

use user_lib::{fork, getpid, wait};

// 教学目标：
// 用最小案例验证 fork 后父子分支、wait 返回值与子进程退出码传递。

#[unsafe(no_mangle)]
pub extern "C" fn main() -> i32 {
    assert_eq!(wait(&mut 0i32), -1);
    println!("sys_wait without child process test passed!");
    println!("parent start, pid = {}!", getpid());
    let pid = fork();
    if pid == 0 {
        // child process
        println!("hello child process!");
        100
    } else {
        // parent process
        let mut exit_code: i32 = 0;
        println!("ready waiting on parent process!");
        assert_eq!(pid, wait(&mut exit_code));
        assert_eq!(exit_code, 100);
        println!("child process pid = {}, exit code = {}", pid, exit_code);
        0
    }
}