reboot.2: Note errors for invalid commands inside a PID namespace

Signed-off-by: Wang Long <long.wanglong@huawei.com>

diff --git a/man2/reboot.2 b/man2/reboot.2
index db0806c07bf6ac00a300190f250da464cc87bdc5..2dfaeb73fb26999fc9ddc739c74e9ca5574c1761 100644 (file)
--- a/man2/reboot.2
+++ b/man2/reboot.2
@@ -185,6 +185,12 @@ and
 cause a
 .B SIGINT
 signal to be sent.
+For the other
+.I cmd
+values, \-1 is returned and
+.I errno
+is set to
+.BR EINVAL .
 .SH RETURN VALUE
 For the values of
 .I cmd