const Error = error{
    unexpected_result,
};
const std = #import("std");

const main = fn() Error!void {
    if (std.os.duplicate_process()) |pid| {
        if (pid == 0) {
            std.print(bytes = "Hello from child\n");
            std.os.exit(exit_code = 0);
        } else {
            std.print(bytes = "Hello from parent\n");
        }
    } else {
        std.print(bytes = "Unable to create child process\n");
        return Error.unexpected_result;
    }
}