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::{close, open, unlink, write, OpenFlags};

// 教学目标：
// 反复 open/write/close/unlink，验证文件资源回收与目录项一致性。
/// 测试大量 open/unlink，输出 Test mass open/unlink OK! 就算正确。

#[unsafe(no_mangle)]
extern "C" fn main() -> i32 {
    let test_str = "some random long long long long long long long long string";
    let fname = "fname3\0";
    for i in 0..10 {
        let fd = open(fname, OpenFlags::CREATE | OpenFlags::WRONLY);
        if fd == -1 {
            panic!("failed to create file");
        }
        let fd = fd as usize;
        for _ in 0..50 {
            write(fd, test_str.as_bytes());
        }
        close(fd);
        assert_eq!(unlink(fname), 0);
        let fd = open(fname, OpenFlags::RDONLY);
        assert!(fd < 0);
        println!("test iteration {}", i)
    }
    println!("Test mass open/unlink OK!");
    0
}