From 8e821c3aa84ca422126a3b6d4c42db2eabff6e53 Mon Sep 17 00:00:00 2001
From: Michael Kerrisk <mtk.manpages@gmail.com>
Date: Sat, 2 Dec 2017 09:22:40 +0100
Subject: [PATCH] user_namespaces.7: Mention NS_GET_OWNER_UID ioctl() operation

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
---
 man7/user_namespaces.7 | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/man7/user_namespaces.7 b/man7/user_namespaces.7
index 24885756c..9249cb76f 100644
--- a/man7/user_namespaces.7
+++ b/man7/user_namespaces.7
@@ -212,6 +212,12 @@ has all capabilities in the namespace.
 By virtue of the previous rule,
 this means that the process has all capabilities in all
 further removed descendant user namespaces as well.
+The
+.B NS_GET_OWNER_UID
+.BR ioctl (2)
+operation can be used to discover the user ID of the owner of the namespace;
+see
+.BR ioctl_ns (2).
 .\"
 .\" ============================================================
 .\"