Constant STDIN 

pub const STDIN: BorrowedFd<'static>;

🔬This is a nightly-only experimental API. (stdio_fd_consts #150836)

Available on Unix or HermitCore or target_os=trusty or WASI or target_os=motor only.

The file descriptor for the standard input stream of the current process.

See io::stdin() for the higher level handle, which should be preferred whenever possible. See STDERR for why the file descriptor might be required and caveats.