2 files changed, 81 insertions, 0 deletions
diff --git a/tests/zfs-tests/include/commands.cfg b/tests/zfs-tests/include/commands.cfg
index 968ab3cd1..57b1bd315 100644
--- a/tests/zfs-tests/include/commands.cfg
+++ b/tests/zfs-tests/include/commands.cfg
@@ -52,6 +52,7 @@ export SYSTEM_FILES='arp
     gunzip
     gzip
     head
+    hostid
     hostname
     id
     iostat
diff --git a/tests/zfs-tests/include/libtest.shlib b/tests/zfs-tests/include/libtest.shlib
index ddfe550bf..1d1c57e7a 100644
--- a/tests/zfs-tests/include/libtest.shlib
+++ b/tests/zfs-tests/include/libtest.shlib
@@ -3428,3 +3428,83 @@ function swap_cleanup
 
 	return 0
 }
+
+#
+# Set a global system tunable (64-bit value)
+#
+# $1 tunable name
+# $2 tunable values
+#
+function set_tunable64
+{
+	set_tunable_impl "$1" "$2" Z
+}
+
+#
+# Set a global system tunable (32-bit value)
+#
+# $1 tunable name
+# $2 tunable values
+#
+function set_tunable32
+{
+	set_tunable_impl "$1" "$2" W
+}
+
+function set_tunable_impl
+{
+	typeset tunable="$1"
+	typeset value="$2"
+	typeset mdb_cmd="$3"
+	typeset module="${4:-zfs}"
+
+	[[ -z "$tunable" ]] && return 1
+	[[ -z "$value" ]] && return 1
+	[[ -z "$mdb_cmd" ]] && return 1
+
+	case "$(uname)" in
+	Linux)
+		typeset zfs_tunables="/sys/module/$module/parameters"
+		[[ -w "$zfs_tunables/$tunable" ]] || return 1
+		echo -n "$value" > "$zfs_tunables/$tunable"
+		return "$?"
+		;;
+	SunOS)
+		[[ "$module" -eq "zfs" ]] || return 1
+		echo "${tunable}/${mdb_cmd}0t${value}" | mdb -kw
+		return "$?"
+		;;
+	esac
+}
+
+#
+# Get a global system tunable
+#
+# $1 tunable name
+#
+function get_tunable
+{
+	get_tunable_impl "$1"
+}
+
+function get_tunable_impl
+{
+	typeset tunable="$1"
+	typeset module="${2:-zfs}"
+
+	[[ -z "$tunable" ]] && return 1
+
+	case "$(uname)" in
+	Linux)
+		typeset zfs_tunables="/sys/module/$module/parameters"
+		[[ -f "$zfs_tunables/$tunable" ]] || return 1
+		cat $zfs_tunables/$tunable
+		return "$?"
+		;;
+	SunOS)
+		[[ "$module" -eq "zfs" ]] || return 1
+		;;
+	esac
+
+	return 1
+}