rsix 0.22.4

#![cfg(not(target_os = "wasi"))]
// This test interacts with `cargo test` in ways which causes failures on
// darwin; disable it until we have a better option.
#![cfg(not(any(target_os = "ios", target_os = "macos")))]

/// Use `dup2` to replace the stdin and stdout file descriptors.
#[test]
fn dup2_to_replace_stdio() {
    use io_lifetimes::AsFilelike;
    use rsix::io::{dup2, pipe};
    use std::io::{BufRead, BufReader, Write};
    use std::mem::forget;

    // This test is flaky under qemu.
    if std::env::vars().any(|var| var.0.starts_with("CARGO_TARGET_") && var.0.ends_with("_RUNNER"))
    {
        return;
    }

    let (reader, writer) = pipe().unwrap();
    let (stdin, stdout) = unsafe { (rsix::io::take_stdin(), rsix::io::take_stdout()) };
    dup2(&reader, &stdin).unwrap();
    dup2(&writer, &stdout).unwrap();
    forget(stdin);
    forget(stdout);

    drop(reader);
    drop(writer);

    // Don't use std::io::stdout() because in tests it's captured.
    unsafe {
        writeln!(
            rsix::io::stdout().as_filelike_view::<std::fs::File>(),
            "hello, world!"
        )
        .unwrap();

        let mut s = String::new();
        BufReader::new(&*rsix::io::stdin().as_filelike_view::<std::fs::File>())
            .read_line(&mut s)
            .unwrap();
        assert_eq!(s, "hello, world!\n");
    }
}