interface process {
    use common.{env-vars};

    /// A command.
    record command {
        /// The command to execute.
        command: string,
        /// The arguments to pass to the command.
        args: list<string>,
        /// The environment variables to set for the command.
        env: env-vars,
    }

    /// The output of a finished process.
    record output {
        /// The status (exit code) of the process.
        ///
        /// On Unix, this will be `None` if the process was terminated by a signal.
        status: option<s32>,
        /// The data that the process wrote to stdout.
        stdout: list<u8>,
        /// The data that the process wrote to stderr.
        stderr: list<u8>,
    }

    /// Executes the given command as a child process, waiting for it to finish
    /// and collecting all of its output.
    run-command: func(command: command) -> result<output, string>;
}