如何从Rust写入特定的原始文件描述符? [英] How do I write to a specific raw file descriptor from Rust?

问题描述

我需要写文件描述符3.我一直在搜索它，但是文档却很差.我发现的唯一一件事就是使用了libc库和fdopen方法，但是我还没有找到任何有关如何使用它或在上面写东西的示例.

I need to write to file descriptor 3. I have been searching for it but the documentation is quite poor. The only thing that I have found is the use of libc library and the fdopen method, but I haven't found any example about how to use it or write on it.

任何人都可以给我提供一个在Rust中写入文件描述符的示例吗?

Can anyone provide me an example of writing to a file descriptor in Rust?

推荐答案

您可以使用 File 来自特定的文件描述符，但仅在类似UNIX的操作系统上:

You can use FromRawFd to create a File from a specific file descriptor, but only on UNIX-like operating systems:

use std::{
    fs::File,
    io::{self, Write},
    os::unix::io::FromRawFd,
};

fn main() -> io::Result<()> {
    let mut f = unsafe { File::from_raw_fd(3) };
    write!(&mut f, "Hello, world!")?;
    Ok(())
}

$ target/debug/example 3> /tmp/output
$ cat /tmp/output
Hello, world!

from_raw_fd是不安全的，因为不能保证文件描述符有效或由谁真正负责该文件描述符.

from_raw_fd is unsafe because there's no guarantee that the file descriptor is valid or who is actually responsible for that file descriptor.

创建的File将承担文件描述符的所有权:当File超出范围时，文件描述符将被关闭.您可以通过使用 IntoRawFd 或 mem::forget .

The created File will assume ownership of the file descriptor: when the File goes out of scope, the file descriptor will be closed. You can avoid this by using either IntoRawFd or mem::forget.

另请参阅:

• 如何在Rust中读取特定的原始文件描述符?

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