pid_namespaces.7: Refer to namespaces(7) for information about NS_GET_PARENT

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

diff --git a/man7/pid_namespaces.7 b/man7/pid_namespaces.7
index 419946867976f5e5a837a9d4567bbbacb7639b68..2bf123a879e7e9d69e569e4f9cc272a988336050 100644 (file)
--- a/man7/pid_namespaces.7
+++ b/man7/pid_namespaces.7
@@ -198,6 +198,13 @@ they may not move in the other direction.
 That is to say, processes may not enter any ancestor namespaces
 (parent, grandparent, etc.).
 Changing PID namespaces is a one-way operation.
+
+The
+.BR NS_GET_PARENT
+.BR ioctl (2)
+operation can be used to discover the parental relationship
+between PID namespaces; see
+.BR namespaces (7).
 .\"
 .\" ============================================================
 .\"