setns.2: Document CLONE_NEWCGROUP

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

diff --git a/man2/setns.2 b/man2/setns.2
index ceb709fcaccdf5ccf1c4fc07bb4cf0e910c66ec1..df8eb853208109695dfc56c1ce46ea120bc39314 100644 (file)
--- a/man2/setns.2
+++ b/man2/setns.2
@@ -41,6 +41,10 @@ This argument can have one of the following values:
 .BR 0
 Allow any type of namespace to be joined.
 .TP
+.BR CLONE_NEWCGROUP " (since Linux 4.6)"
+.I fd
+must refer to a cgroup namespace.
+.TP
 .BR CLONE_NEWIPC " (since Linux 3.0)"
 .I fd
 must refer to an IPC namespace.
@@ -135,6 +139,11 @@ in the target mount namespace.
 See
 .BR user_namespaces (7)
 for details on the interaction of user namespaces and mount namespaces.
+
+Using
+.BR setns ()
+to change the caller's cgroup namespace does not change
+the caller's cgroup memberships.
 .SH RETURN VALUE
 On success,
 .BR setns ()