PR standards/44921: Add errno consts for robust mutexes

Add the two missing errno.h constants: EOWNERDEAD and ENOTRECOVERABLE.
While technically they're used for robust mutexes which we do not
support at the moment, they are listed in POSIX and used by libc++.
While libc++ can be made to build without it, it just locally redefines
the values then, so we may as well define them globally.

lib/libc/nls/C.msg

@@ -191,6 +191,10 @@ $ ENOLINK
 95 Link has been severed
 $ EPROTO
 96 Protocol error
+$ EOWNERDEAD
+97 Previous owner died
+$ ENOTRECOVERABLE
+98 State not recoverable
 $set 2
 $ SIGHUP
 1 Hangup

lib/libc/sys/intro.2

@@ -1,4 +1,4 @@
-.\"	$NetBSD: intro.2,v 1.60 2017/07/03 21:32:50 wiz Exp $
+.\"	$NetBSD: intro.2,v 1.61 2020/03/08 22:09:42 mgorny Exp $
 .\"
 .\" Copyright (c) 1980, 1983, 1986, 1991, 1993
 .\"	The Regents of the University of California.  All rights reserved.
@@ -505,6 +505,11 @@ Occurs when the link (virtual circuit) connecting to a remote machine is gone.
 Some protocol error occurred.
 This error is device-specific, but is generally not related to a hardware
 failure.
+.It Er 97 EOWNERDEAD Em "Previous owner died" .
+Occurs when the last owner of a robust mutex dies while holding the mutex.
+.It Er 98 ENOTRECOVERABLE Em "State not recoverable" .
+Occurs when the last owner of a robust mutex died and the new owner
+had unlocked the mutex without making its state consistent.
 .El
 .Sh DEFINITIONS
 .Bl -tag -width Ds

sys/compat/linux/common/linux_errno.c

@@ -1,4 +1,4 @@
-/*	$NetBSD: linux_errno.c,v 1.15 2013/12/22 17:14:22 njoly Exp $	*/
+/*	$NetBSD: linux_errno.c,v 1.16 2020/03/08 22:09:43 mgorny Exp $	*/
 
 /*-
  * Copyright (c) 1995 The NetBSD Foundation, Inc.
@@ -30,7 +30,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: linux_errno.c,v 1.15 2013/12/22 17:14:22 njoly Exp $");
+__KERNEL_RCSID(0, "$NetBSD: linux_errno.c,v 1.16 2020/03/08 22:09:43 mgorny Exp $");
 
 #include <sys/errno.h>
 
@@ -138,5 +138,7 @@ const int native_to_linux_errno[] = {
 	LINUX_SCERR_SIGN LINUX_EMULTIHOP,
 	LINUX_SCERR_SIGN LINUX_ENOLINK,
 	LINUX_SCERR_SIGN LINUX_EPROTO,		/* 96 */
+	LINUX_SCERR_SIGN LINUX_EOWNERDEAD,
+	LINUX_SCERR_SIGN LINUX_ENOTRECOVERABLE,
 };
 __CTASSERT(__arraycount(native_to_linux_errno) == ELAST + 1);

sys/sys/errno.h

@@ -1,4 +1,4 @@
-/*	$NetBSD: errno.h,v 1.41 2020/03/08 22:05:40 mgorny Exp $	*/
+/*	$NetBSD: errno.h,v 1.42 2020/03/08 22:09:43 mgorny Exp $	*/
 
 /*
  * Copyright (c) 1982, 1986, 1989, 1993
@@ -172,7 +172,11 @@
 #define	ENOLINK		95		/* Link has been severed */
 #define	EPROTO		96		/* Protocol error */
 
-#define	ELAST		96		/* Must equal largest errno */
+/* Robust mutexes */
+#define	EOWNERDEAD	97		/* Previous owner died */
+#define	ENOTRECOVERABLE	98		/* State not recoverable */
+
+#define	ELAST		98		/* Must equal largest errno */
 
 #if defined(_KERNEL) || defined(_KMEMUSER)
 /* pseudo-errors returned inside kernel to modify return to process */

tests/include/t_errno.c

@@ -1,4 +1,4 @@
-/*	$NetBSD: t_errno.c,v 1.1 2011/05/01 17:07:05 jruoho Exp $ */
+/*	$NetBSD: t_errno.c,v 1.2 2020/03/08 22:09:43 mgorny Exp $ */
 
 /*-
  * Copyright (c) 2011 The NetBSD Foundation, Inc.
@@ -29,7 +29,7 @@
  * POSSIBILITY OF SUCH DAMAGE.
  */
 #include <sys/cdefs.h>
-__RCSID("$NetBSD: t_errno.c,v 1.1 2011/05/01 17:07:05 jruoho Exp $");
+__RCSID("$NetBSD: t_errno.c,v 1.2 2020/03/08 22:09:43 mgorny Exp $");
 
 #include <atf-c.h>
 #include <errno.h>
@@ -48,7 +48,6 @@ ATF_TC_BODY(errno_constants, tc)
 	 * The following definitions should be available
 	 * according to IEEE Std 1003.1-2008, issue 7.
 	 */
-	atf_tc_expect_fail("PR standards/44921");
 
 	fail = true;