linux-kernel - Documenting reboot(2) changes for PID namespace in 3.9

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Message-ID: <CAKgNAkg8+gx8K6W=g1LStESRO=vgtvQtt2Q-+LG5R6Tk3ncYZQ@mail.gmail.com>
Date:	Tue, 12 Mar 2013 08:07:44 +0100
From:	"Michael Kerrisk (man-pages)" <mtk.manpages@...il.com>
To:	Li Zefan <lizefan@...wei.com>
Cc:	linux-man <linux-man@...r.kernel.org>,
	Linux Containers <containers@...ts.linux-foundation.org>,
	lkml <linux-kernel@...r.kernel.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>
Subject: Documenting reboot(2) changes for PID namespace in 3.9

Li,

Regarding your commit 923c7538236564c46ee80c253a416705321f13e3 , I
plan to apply the following patch to the reboot(2) manual page. Does
it look okay to you?

Thanks,

Michael

diff --git a/man2/reboot.2 b/man2/reboot.2
index 8347870..1c17b85 100644
--- a/man2/reboot.2
+++ b/man2/reboot.2
@@ -24,7 +24,7 @@
 .\" Modified, 27 May 2004, Michael Kerrisk <mtk.manpages@...il.com>
 .\"     Added notes on capability requirements
 .\"
-.TH REBOOT 2 2010-10-31 "Linux" "Linux Programmer's Manual"
+.TH REBOOT 2 2013-03-12 "Linux" "Linux Programmer's Manual"
 .SH NAME
 reboot \- reboot or enable/disable Ctrl-Alt-Del
 .SH SYNOPSIS
@@ -147,6 +147,26 @@ For the i386 architecture, the additional
argument does not do
 anything at present (2.1.122), but the type of reboot can be
 determined by kernel command-line arguments ("reboot=...") to be
 either warm or cold, and either hard or through the BIOS.
+.SS Behavior inside PID namespaces
+.\" commit commit 923c7538236564c46ee80c253a416705321f13e3
+Since Linux 3.9, when
+.BR reboot ()
+is called from a PID namespace (see
+.BR pid_namespaces (7))
+other than the initial PID namespace,
+the effect of the call is to send a signal to the namespace "init" process.
+.BR LINUX_REBOOT_CMD_RESTART
+and
+.BR LINUX_REBOOT_CMD_RESTART2
+cause a
+.BR SIGHUP
+signal to be sent.
+.BR LINUX_REBOOT_CMD_POWER_OFF
+and
+.BR LINUX_REBOOT_CMD_HALT
+cause a
+.B SIGINT
+signal to be sent.
 .SH RETURN VALUE
 For the values of
 .I cmd
--
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