stdin().read_u8 results in unknown error (OS Error 8 (FormatMessageW() returned error 15105))

match std::io::stdin().read_u8() {
    Ok(_) => (),
    Err(e) => println!("{}",e)
}

Output: "unknown error (OS Error 8 (FormatMessageW() returned error 15100))"

Win 7
rustc 0.10
host: i686-pc-mingw32

[klutzy]

Error 8 indicates ERROR_NOT_ENOUGH_MEMORY.
The code works for me (rustc 0.10 + win 8.1). Is the code a part of large portion which may consume lots or memeory?

No, it's just a main function containing the above code.

[alexcrichton]

I suspect that this is a duplicate of #13259.

What happens if you add this right before you read from stdin?

unsafe { ::std::rt::stack::record_sp_limit(0); }

With that I get "unknown error (OS Error 8: Not enough storage is available to process this command.)"

[BrianOtto]

I am getting the same error with the following code ...

use std::io;

fn main() {
    for line in io::stdin().lines() {
        match line {
            Ok(line) => io::print(line),
            Err(err) => fail!("IO error: {}", err),
        }
    }
}

I am using Rust 0.10 on Windows 7 (i686-pc-mingw32). Please see my discussion about it on Reddit.

[alexcrichton]

Apparently this is because we're using a buffered reader on windows. It looks like windows returns this error when using a 64K buffer and a 32K buffer. Decreasing it to 16K makes the kernel happy apparently (who knew?)

[alexcrichton]

While not quite the same, looks like libuv has run across the same issue

[klutzy]

Wow!
msdn ReadFile page also has similar user report: "In some cases if the value is 'too big' ReadFile(...) will return ERROR_INVALID_PARAMETER."

[BrianOtto]

I just wanted to say thank you to the guys who researched and resolved this. I see the latest Windows Installer has the update in it and my example code now works in Windows 7. That was a quick turn around, thanks!! :)