Fix the OTIOCGETD emulation. Line discipline 0 is NTTYDISC.
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26e41a6045
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@ -1,4 +1,4 @@
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/* $NetBSD: tty_43.c,v 1.36 2020/05/23 23:42:41 ad Exp $ */
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/* $NetBSD: tty_43.c,v 1.37 2020/08/08 19:04:58 christos Exp $ */
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/*-
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* Copyright (c) 2008 The NetBSD Foundation, Inc.
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@ -62,7 +62,7 @@
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: tty_43.c,v 1.36 2020/05/23 23:42:41 ad Exp $");
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__KERNEL_RCSID(0, "$NetBSD: tty_43.c,v 1.37 2020/08/08 19:04:58 christos Exp $");
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#if defined(_KERNEL_OPT)
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#include "opt_compat_netbsd.h"
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@ -250,8 +250,8 @@ compat_43_ttioctl(struct tty *tp, u_long com, void *data, int flag,
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case OTIOCGETD:
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mutex_spin_enter(&tty_lock);
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*(int *)data = (tp->t_linesw == NULL) ?
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2 /* XXX old NTTYDISC */ : tp->t_linesw->l_no;
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*(int *)data = (tp->t_linesw == NULL || tp->t_linesw->l_no == 0)
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? 2 /* XXX old NTTYDISC */ : tp->t_linesw->l_no;
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mutex_spin_exit(&tty_lock);
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break;
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