Index: head/tests/sys/aio/local.h
===================================================================
--- head/tests/sys/aio/local.h	(revision 318097)
+++ head/tests/sys/aio/local.h	(revision 318098)
@@ -1,74 +1,87 @@
 /*-
  * Copyright (c) 2016 Chelsio Communications, Inc.
  * All rights reserved.
  * Written by: John Baldwin <jhb@FreeBSD.org>
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
  *    documentation and/or other materials provided with the distribution.
  *
  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  * SUCH DAMAGE.
  *
  * $FreeBSD$
  */
 
 #ifndef _AIO_TEST_LOCAL_H_
 #define	_AIO_TEST_LOCAL_H_
 
 #include <sys/types.h>
 #include <sys/sysctl.h>
 #include <errno.h>
 #include <stdio.h>
 #include <string.h>
 #include <unistd.h>
 
 #include <atf-c.h>
 
-#define	ATF_REQUIRE_UNSAFE_AIO() do {					\
-	size_t _len;							\
-	int _unsafe;							\
-									\
-	_len = sizeof(_unsafe);						\
-	if (sysctlbyname("vfs.aio.enable_unsafe", &_unsafe, &_len, NULL,\
-	    0) < 0) {							\
-		if (errno != ENOENT)					\
-			atf_libc_error(errno,				\
-			    "Failed to read vfs.aio.enable_unsafe");	\
-	} else if (_unsafe == 0)					\
-		atf_tc_skip("Unsafe AIO is disabled");			\
+static const char	*sysctl_oid_name = "vfs.aio.enable_unsafe";
+
+static int
+is_unsafe_aio_enabled(void)
+{
+	size_t len;
+	int unsafe;
+
+	len = sizeof(unsafe);
+	if (sysctlbyname(sysctl_oid_name, &unsafe, &len, NULL, 0) < 0) {
+		if (errno == ENOENT)
+			return (-1);
+		return (0);
+	}
+	return (unsafe == 0 ? 0 : 1);
+}
+
+#define	ATF_REQUIRE_UNSAFE_AIO() do {						\
+	switch (is_unsafe_aio_enabled()) {					\
+	case -1:								\
+		atf_libc_error(errno, "Failed to read %s", sysctl_oid_name);	\
+		break;								\
+	case 0:									\
+		atf_tc_skip("Unsafe AIO is disabled");				\
+		break;								\
+	default:								\
+		break;								\
+	}									\
 } while (0)
 
-#define	PLAIN_REQUIRE_UNSAFE_AIO(_exit_code) do {			\
-	size_t _len;							\
-	int _unsafe;							\
-									\
-	_len = sizeof(_unsafe);						\
-	if (sysctlbyname("vfs.aio.enable_unsafe", &_unsafe, &_len, NULL,\
-	    0) < 0) {							\
-		if (errno != ENOENT) {					\
-			printf("Failed to read vfs.aio.enable_unsafe: %s\n",\
-			    strerror(errno));				\
-			_exit(1);					\
-		}							\
-	} else if (_unsafe == 0) {					\
-		printf("Unsafe AIO is disabled");			\
-		_exit(_exit_code);					\
-	}								\
+#define	PLAIN_REQUIRE_UNSAFE_AIO(_exit_code) do {				\
+	switch (is_unsafe_aio_enabled()) {					\
+	case -1:								\
+		printf("Failed to read %s", sysctl_oid_name);			\
+		_exit(_exit_code);						\
+		break;								\
+	case 0:									\
+		printf("Unsafe AIO is disabled\n");				\
+		_exit(_exit_code);						\
+		break;								\
+	default:								\
+		break;								\
+	}									\
 } while (0)
 
 #endif /* !_AIO_TEST_LOCAL_H_ */