gistfile1.rb

require 'inline'
class BetterReadline
    inline :C do |builder|
        builder.include '<ruby.h>'
        builder.include '<readline/readline.h>'
src = <<END
    VALUE readline_intern(void * data) {
        char ** rstr = (char **)data;
        *rstr = readline(NULL);
        return Qnil;
    }
END
        builder.prefix(src)
src = <<END
    VALUE rb_readline(void) {
        char * str = NULL;
        rb_thread_blocking_region(readline_intern, &str, NULL, NULL);
        return rb_str_new2(str);
    }
END
        builder.c(src, method_name: 'readline')
    end
end # class BetterReadline