namespaces.7: Add ENOTTY error() for ioctl namespace operations

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

diff --git a/man7/namespaces.7 b/man7/namespaces.7
index c3cf9b4e4febef411a904c31f4f4d367fa78e9bf..6dc89138068a3451bdeb8514602d6e910fab9abf 100644 (file)
--- a/man7/namespaces.7
+++ b/man7/namespaces.7
@@ -386,7 +386,7 @@ file to determine whether that is the owning/parent namespace.
 
 Either of these
 .BR ioctl (2)
-operations can fail with the following error:
+operations can fail with the following errors:
 .TP
 .B EPERM
 The requested namespace is outside of the caller's namespace scope.
@@ -394,6 +394,9 @@ This error can occur if, for example, the owning user namespace is an
 ancestor of the caller's current user namespace.
 It can also occur on attempts to obtain the parent of the initial
 user or PID namespace.
+.TP
+.B ENOTTY
+The operation is not supported by this kernel version.
 .PP
 Additionally, the
 .B NS_GET_PARENT