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by koakuma-chan 437 days ago
> You are wrong about that. The code is just sending packed structures back and forth.

Among other things, this would only work if your client is written in a language that supports C structures.

> Do yourself a favor and stop responding. You have no idea what you are saying and it is immensely evident to anyone who has a clue about software engineering.

Says the one who didn't know how to use non-blocking sockets.

> That is correct. There is no other way to handle SIGUSR1 in a sane way if you are not using SIGIO. At least, there was no other way until signalfd was invented, but that is not cross platform. epoll isn't either.

```

use std::io;

use tokio::{

    net::UnixListener,

    select,

    signal::unix::{SignalKind, signal},
};

#[tokio::main(flavor = "current_thread")]

async fn main() -> io::Result<()> {

    let mut signal = signal(SignalKind::user_defined1())?;

    let listener = UnixListener::bind("./hi")?;

    loop {
        select! {
            _ = signal.recv() => {
                todo!();
            }

            _ = listener.accept() => {
                todo!();
            }
        }
    }
}

```
1 comments
ryao 436 days ago
> Among other things, this would only work if your client is written in a language that supports C structures.

Such languages are used at both ends. Otherwise, this would not have been working in production for ~13 years.

> Says the one who didn't know how to use non-blocking sockets.

Neither did you until you learned it. If you successfully begin a career in software engineering and years later, have the humility to admit the mistakes you made when starting out for the benefit of others, you will deserve to have an incompetent know it all deride you for having been so kind to admit them, just like you are doing to me here.

Anyone with a modicum of programming knowledge can write code snippets free from mistakes immediately after being told about the mistakes that would be made when given a simplified explanation of one thing that is done in production software. The problem with software engineering is that nobody tells you everything you can do wrong before you do it, and you are not writing code snippets, but production software.

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koakuma-chan 436 days ago
> If you successfully begin a career in software engineering and years later, have the humility to admit the mistakes you made when starting out for the benefit of others, you will deserve to have an incompetent know it all deride you for having been so kind to admit them, just like you are doing to me here.

I wouldn't "deride" you if you weren't acting arrogant and calling me incompetent or whatever.

> The problem with software engineering is that nobody tells you everything you can do wrong before you do it

Maybe, but the docs definitely tell you about EAGAIN and freeing memory after you're done using it. In Rust many kinds of logical errors you could potentially have made are eliminated by the type system though. For example I wrote a news scraper in Rust and ran it locally a couple times to see that it works, and it's been running for half a year now on a VPS and I never had to touch it or restart anything.

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