最近在写一个有栈协程库https://github.com/acl-dev/open-coroutine，其中用到了hook技术。

用户代码

use open_coroutine::{co, Yielder};
use std::os::raw::c_void;
use std::time::Duration;

extern "C" fn f1(
    _yielder: &Yielder<Option<&'static mut c_void>, (), Option<&'static mut c_void>>,
    _input: Option<&'static mut c_void>,
) -> Option<&'static mut c_void> {
    println!("[coroutine1] launched");
    None
}

extern "C" fn f2(
    _yielder: &Yielder<Option<&'static mut c_void>, (), Option<&'static mut c_void>>,
    _input: Option<&'static mut c_void>,
) -> Option<&'static mut c_void> {
    println!("[coroutine2] launched");
    None
}

fn main() {
    co(f1, None, 4096);
    co(f2, None, 4096);
    std::thread::sleep(Duration::from_millis(1));
    println!("scheduler finished successfully!");
}

正常输出

[coroutine1] launched
[coroutine2] launched
scheduler finished successfully!

我把std::thread::sleep(Duration::from_millis(1))的底层系统调用nanosleep hook了，使得它重定向到了新的实现open-coroutine/libhook/unix.rs

在我继续尝试hook其他系统函数时，出现了问题：通过CI构建出的新动态链接库，无法获取原始系统函数nanosleep，也许这是rust的bug？

构建动态链接库的命令为cargo build --release -p libhook

代码改动见https://github.com/acl-dev/open-coroutine/pull/46

CI失败的页面：https://github.com/acl-dev/open-coroutine/actions/runs/3780190082/jobs/6426067579

向大佬们求助。