.\" Modified, 27 May 2004, Michael Kerrisk <mtk.manpages@gmail.com>
.\" Added notes on capability requirements
.\"
-.TH REBOOT 2 2010-10-31 "Linux" "Linux Programmer's Manual"
+.TH REBOOT 2 2015-02-01 "Linux" "Linux Programmer's Manual"
.SH NAME
reboot \- reboot or enable/disable Ctrl-Alt-Del
.SH SYNOPSIS
and since 2.5.71 also
.B LINUX_REBOOT_MAGIC2C
(that is, 537993216)
-are permitted as value for
+are permitted as values for
.IR magic2 .
(The hexadecimal values of these constants are meaningful.)
+
The
.I cmd
argument can have the following values:
.TP
.B LINUX_REBOOT_CMD_CAD_OFF
-(RB_DISABLE_CAD, 0).
+.RB ( RB_DISABLE_CAD ,
+0).
CAD is disabled.
This means that the CAD keystroke will cause a
.B SIGINT
proper action (maybe: kill all processes, sync, reboot).
.TP
.B LINUX_REBOOT_CMD_CAD_ON
-(RB_ENABLE_CAD, 0x89abcdef).
+.RB ( RB_ENABLE_CAD ,
+0x89abcdef).
CAD is enabled.
This means that the CAD keystroke will immediately cause
the action associated with
.BR LINUX_REBOOT_CMD_RESTART .
.TP
.B LINUX_REBOOT_CMD_HALT
-(RB_HALT_SYSTEM, 0xcdef0123; since 1.1.76).
+.RB ( RB_HALT_SYSTEM ,
+0xcdef0123; since Linux 1.1.76).
The message "System halted." is printed, and the system is halted.
Control is given to the ROM monitor, if there is one.
If not preceded by a
.BR sync (2),
data will be lost.
.TP
-.BR LINUX_REBOOT_CMD_KEXEC " (since Linux 2.6.13)"
+.BR LINUX_REBOOT_CMD_KEXEC
+.RB ( RB_KEXEC ,
+0x45584543, since Linux 2.6.13).
Execute a kernel that has been loaded earlier with
.BR kexec_load (2).
This option is available only if the kernel was configured with
.BR CONFIG_KEXEC .
.TP
.B LINUX_REBOOT_CMD_POWER_OFF
-(0x4321fedc; since 2.1.30).
+.RB ( RB_POWER_OFF ,
+0x4321fedc; since Linux 2.1.30).
The message "Power down." is printed, the system is stopped,
and all power is removed from the system, if possible.
If not preceded by a
data will be lost.
.TP
.B LINUX_REBOOT_CMD_RESTART
-(RB_AUTOBOOT, 0x1234567).
+.RB ( RB_AUTOBOOT ,
+0x1234567).
The message "Restarting system." is printed, and a default
restart is performed immediately.
If not preceded by a
data will be lost.
.TP
.B LINUX_REBOOT_CMD_RESTART2
-(0xa1b2c3d4; since 2.1.30).
+(0xa1b2c3d4; since Linux 2.1.30).
The message "Restarting system with command \(aq%s\(aq" is printed,
and a restart (using the command string given in
.IR arg )
If not preceded by a
.BR sync (2),
data will be lost.
+.TP
+.BR LINUX_REBOOT_CMD_SW_SUSPEND
+.RB ( RB_SW_SUSPEND ,
+0xd000fce1; since Linux 2.5.18).
+The system is suspended (hibernated) to disk.
+This option is available only if the kernel was configured with
+.BR CONFIG_HIBERNATION .
.LP
Only the superuser may call
.BR reboot ().
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 cf3f89214ef6a33fad60856bc5ffd7bb2fc4709b
+.\" see also commit 923c7538236564c46ee80c253a416705321f13e3
+Since Linux 3.4, 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
is Linux-specific,
and should not be used in programs intended to be portable.
.SH SEE ALSO
+.BR kexec_load (2),
.BR sync (2),
.BR bootparam (7),
.BR capabilities (7),
.BR ctrlaltdel (8),
.BR halt (8),
.BR reboot (8)
+.SH COLOPHON
+This page is part of release 3.79 of the Linux
+.I man-pages
+project.
+A description of the project,
+information about reporting bugs,
+and the latest version of this page,
+can be found at
+\%http://www.kernel.org/doc/man\-pages/.
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