console

static VALUE
console_dev(VALUE klass)
{
    VALUE con = 0;
    rb_io_t *fptr;

    if (klass == rb_cIO) klass = rb_cFile;
    if (rb_const_defined(klass, id_console)) {
        con = rb_const_get(klass, id_console);
        if (RB_TYPE_P(con, T_FILE)) {
            if ((fptr = RFILE(con)->fptr) && GetReadFD(fptr) != -1)
                return con;
        }
        rb_const_remove(klass, id_console);
    }
    {
        VALUE args[2];
#if defined HAVE_TERMIOS_H || defined HAVE_TERMIO_H || defined HAVE_SGTTY_H
# define CONSOLE_DEVICE "/dev/tty"
#elif defined _WIN32
# define CONSOLE_DEVICE "con$"
# define CONSOLE_DEVICE_FOR_READING "conin$"
# define CONSOLE_DEVICE_FOR_WRITING "conout$"
#endif
#ifndef CONSOLE_DEVICE_FOR_READING
# define CONSOLE_DEVICE_FOR_READING CONSOLE_DEVICE
#endif
#ifdef CONSOLE_DEVICE_FOR_WRITING
        VALUE out;
        rb_io_t *ofptr;
#endif
        int fd;

#ifdef CONSOLE_DEVICE_FOR_WRITING
        fd = rb_cloexec_open(CONSOLE_DEVICE_FOR_WRITING, O_RDWR, 0);
        if (fd < 0) return Qnil;
        rb_update_max_fd(fd);
        args[1] = INT2FIX(O_WRONLY);
        args[0] = INT2NUM(fd);
        out = rb_class_new_instance(2, args, klass);
#endif
        fd = rb_cloexec_open(CONSOLE_DEVICE_FOR_READING, O_RDWR, 0);
        if (fd < 0) {
#ifdef CONSOLE_DEVICE_FOR_WRITING
            rb_io_close(out);
#endif
            return Qnil;
        }
        rb_update_max_fd(fd);
        args[1] = INT2FIX(O_RDWR);
        args[0] = INT2NUM(fd);
        con = rb_class_new_instance(2, args, klass);
        GetOpenFile(con, fptr);
#ifdef HAVE_RUBY_IO_H
        fptr->pathv = rb_obj_freeze(rb_str_new2(CONSOLE_DEVICE));
#else
        fptr->path = ruby_strdup(CONSOLE_DEVICE);
#endif
#ifdef CONSOLE_DEVICE_FOR_WRITING
        GetOpenFile(out, ofptr);
# ifdef HAVE_RB_IO_GET_WRITE_IO
        ofptr->pathv = fptr->pathv;
        fptr->tied_io_for_writing = out;
# else
        fptr->f2 = ofptr->f;
        ofptr->f = 0;
# endif
        ofptr->mode |= FMODE_SYNC;
#endif
        fptr->mode |= FMODE_SYNC;
        rb_const_set(klass, id_console, con);
    }
    return con;
}