StdIo

    pub const StdIo = union(enum) {
        /// Inherit the corresponding stream from the parent process.
        inherit,
        /// Pass an already open file from the parent to the child.
        ///
        /// Nonblocking mode will be kept in the child process if present. This is
        /// likely not supported by the child process. For example:
        /// - Zig's std.Io.File.stdout() assumes blocking mode
        /// - Rust explicity documents that nonblocking stdio may cause panics
        /// - C++ standard streams do not support nonblocking file descriptors
        file: File,
        /// Pass a null stream to the child process by opening "/dev/null" on POSIX
        /// and "NUL" on Windows.
        ignore,
        /// Create a new pipe for the stream.
        ///
        /// The corresponding field (`stdout`, `stderr`, or `stdin`) will be
        /// assigned a `File` object that can be used to read from or write to the
        /// pipe.
        pipe,
        /// Spawn the child process with the corresponding stream missing. This
        /// will likely result in the child encountering EBADF if it tries to use
        /// stdin, stdout, or stderr, or if only one stream is closed, it will
        /// result in them getting mixed up. Generally, this option is for advanced
        /// use cases only.
        close,
    }