[src/trunk]: src/sys tty(9): New function tty_unit for struct cdevsw::d_devto...

[riastradh <riastradh%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/deb1f14c257b
branches:  trunk
changeset: 364707:deb1f14c257b
user:      riastradh <riastradh%NetBSD.org@localhost>
date:      Thu Apr 07 21:46:51 2022 +0000

description:
tty(9): New function tty_unit for struct cdevsw::d_devtounit.

diffstat:

 sys/kern/tty.c |  16 ++++++++++++++--
 sys/sys/tty.h  |   3 ++-
 2 files changed, 16 insertions(+), 3 deletions(-)

diffs (54 lines):

diff -r ee258a01834e -r deb1f14c257b sys/kern/tty.c
--- a/sys/kern/tty.c    Thu Apr 07 20:23:44 2022 +0000
+++ b/sys/kern/tty.c    Thu Apr 07 21:46:51 2022 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: tty.c,v 1.300 2022/03/28 12:39:28 riastradh Exp $      */
+/*     $NetBSD: tty.c,v 1.301 2022/04/07 21:46:51 riastradh Exp $      */
 
 /*-
  * Copyright (c) 2008, 2020 The NetBSD Foundation, Inc.
@@ -63,7 +63,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: tty.c,v 1.300 2022/03/28 12:39:28 riastradh Exp $");
+__KERNEL_RCSID(0, "$NetBSD: tty.c,v 1.301 2022/04/07 21:46:51 riastradh Exp $");
 
 #ifdef _KERNEL_OPT
 #include "opt_compat_netbsd.h"
@@ -2901,6 +2901,18 @@
 }
 
 /*
+ * tty_unit: map dev_t to tty unit number, as with TTUNIT
+ *
+ * => defined as function for use with struct cdevsw::d_devtounit
+ * => not for drivers with different unit numbering, e.g. TTUNIT(d) >> 4
+ */
+int
+tty_unit(dev_t dev)
+{
+       return TTUNIT(dev);
+}
+
+/*
  * ttyprintf_nolock: send a message to a specific tty, without locking.
  *
  * => should be used only by tty driver or anything that knows the
diff -r ee258a01834e -r deb1f14c257b sys/sys/tty.h
--- a/sys/sys/tty.h     Thu Apr 07 20:23:44 2022 +0000
+++ b/sys/sys/tty.h     Thu Apr 07 21:46:51 2022 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: tty.h,v 1.96 2022/03/28 12:39:28 riastradh Exp $       */
+/*     $NetBSD: tty.h,v 1.97 2022/04/07 21:46:51 riastradh Exp $       */
 
 /*-
  * Copyright (c) 2008 The NetBSD Foundation, Inc.
@@ -312,6 +312,7 @@
 void    tty_free(struct tty *);
 u_char *firstc(struct clist *, int *);
 bool    ttypull(struct tty *);
+int     tty_unit(dev_t);
 
 int    clalloc(struct clist *, int, int);
 void   clfree(struct clist *);