# Function stdin

1.0.0 · Source

    pub fn stdin() -> Stdin ⓘ

Expand description

Constructs a new handle to the standard input of the current process.

Each handle returned is a reference to a shared global buffer whose access is synchronized via a mutex. If you need more explicit control over locking, see the `Stdin::lock` method.

#### §Note: Windows Portability Considerations

When operating in a console, the Windows implementation of this stream does not support non-UTF-8 byte sequences. Attempting to read bytes that are not valid UTF-8 will return an error.

In a process with a detached console, such as one using `#![windows_subsystem = "windows"]`, or in a child process spawned from such a process, the contained handle will be null. In such cases, the standard library’s `Read` and `Write` will do nothing and silently succeed. All other I/O operations, via the standard library or via raw Windows API calls, will fail.

## §Examples

Using implicit synchronization:

    use std::io;

    fn main() -> io::Result<()> {
        let mut buffer = String::new();
        io::stdin().read_line(&mut buffer)?;
        Ok(())
    }

Using explicit synchronization:

    use std::io::{self, BufRead};

    fn main() -> io::Result<()> {
        let mut buffer = String::new();
        let stdin = io::stdin();
        let mut handle = stdin.lock();

        handle.read_line(&mut buffer)?;
        Ok(())
    }